Patent Grant
10834992
The present invention relates to a shoe, in particular a sports shoe.
In general, a shoe comprises an outer sole and an upper, which is attached to it. In particular, sports shoes further comprise in general a midsole, which is arranged between the upper and the outer sole, which is also called middle sole. The upper, the outer sole, and (as far as existing) the midsole are made of leather in classical shoes, and (as a general rule) are made of synthetic materials in sports shoes. The outer sole may also be made of rubber.
A shoe differs from a sock in that the upper of the shoe provides the foot with much greater stability than a sock does. The foot is fixed much tighter by an upper than it is by a sock. Moreover, the shoe sole protects the foot from injuries and provides cushioning, i.e. the sole absorbs impacts of forces, e.g. during running. By use of a suitable material, e.g. rubber and/or profiling, a shoe sole furthermore provides the necessary static friction with the underground. In many cases, a sock is not able to fulfill the above-described functions of a shoe.
Outer soles and midsoles made from leather are cut out from a piece of leather. Outer soles and midsoles made from rubber or plastic may be cut out from material webs or manufactured in a casting process.
Several aspects of known methods for manufacturing outer soles and midsoles proved to be disadvantageous. So, for instance, there is always a certain amount of waste in the manufacture of leather soles when the soles are cut out of a piece of leather.
In the manufacture of outer soles and midsoles of different materials, the connection of both is often problematic. If, for example, the outer sole is made of rubber and the midsole of polyurethane, then the two cannot be glued together without considerable effort. Very often, the use of an adhesion promoter is inevitable.
The outer sole and the midsole are often provided with functional areas particularly in sports shoes. For example, an outer sole receives zones with different profiles which may even comprise different materials or material mixtures. A midsole is, for example, provided with cushioning elements in specific areas in order to reduce typical strains on the wearer of the shoe during running. The forming of functional areas during the manufacturing process is often time-consuming and causes additional costs and processes and in most cases increases the weight of the shoe.
Hence, the present invention is based on the problem to reduce or avoid the above-mentioned disadvantages of prior art. In particular, the present invention is based on the problem to provide a light shoe, in particular a sports shoe, which may be manufactured in a simple, cost-effective manner and quickly, with little waste production.
The terms “invention,” “the invention,” “this invention” and “the present invention” used in this patent are intended to refer broadly to all of the subject matter of this patent and the patent claims below. Statements containing these terms should be understood not to limit the subject matter described herein or to limit the meaning or scope of the patent claims below. Embodiments of the invention covered by this patent are defined by the claims below, not this summary. This summary is a high-level overview of various embodiments of the invention and introduces some of the concepts that are further described in the Detailed Description section below. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used in isolation to determine the scope of the claimed subject matter. The subject matter should be understood by reference to appropriate portions of the entire specification of this patent, any or all drawings and each claim.
According to certain embodiments of the present invention, a shoe comprises an upper and at least one of an outer sole and a midsole, one or more of the at least one of the outer sole and the midsole connected to the upper, and one or more of the at least one of the outer sole and the midsole comprising knitwear. In some embodiments, the upper comprises knitwear. In certain embodiments, knitwear in an area of the one or more of the at least one of the outer sole and the midsole and the knitwear in an area of the upper are formed as one-piece knitwear.
According to some embodiments, the knitwear in an area of the one or more of the at least one of the outer sole and the midsole comprises a different binding than the knitwear in an area of the upper. In certain embodiments, the knitwear in an area of the upper comprises a first yarn, and the knitwear in an area of the one or more of the at least one of the outer sole and the midsole comprises a second yarn. In various embodiments, the second yarn is thicker than the first yarn, and/or the second yarn is more abrasion-resistant than the first yarn, and/or second yarn is more water-repellent than the first yarn.
According to some embodiments, the knitwear in an area of the upper is more permeable to air than the knitwear in an area of the one or more of the at least one of the outer sole and the midsole.
In certain embodiments, the knitwear in an area of the one or more of the at least one of the outer sole and the midsole is arranged so that wales of the knitwear in the area of the one or more of the at least one of the outer sole and the midsole run substantially transversely to a longitudinal axis of the one or more of the at least one of the outer sole and the midsole.
In various embodiments, the knitwear comprises stability elements in an area of the one or more of the at least one of the outer sole and the midsole. In these embodiments, the stability elements may be at least one of ribs, waves, and knobs. The stability elements may also be arranged substantially transversely to a longitudinal axis.
According to some embodiments, the knitwear is weft-knitted. In other embodiments, the knitwear is warp-knitted.
In some embodiments, the one or more of the at least one of the outer sole and the midsole is reinforced with a polymer material. In certain embodiments, the knitwear comprises a thermoplastic yarn in an area of the one or more of the at least one of the outer sole and the midsole. In further embodiments, the at least one of the outer sole and the midsole comprises at least the outer sole, and the knitwear comprises at least one rubberized yarn in an area of the outer sole.
According to some embodiments, the knitwear in at least an area of the one or more of the at least one of the outer sole and the midsole has been at least partially immersed in at least one of a rubber bath and a polymer bath.
In certain embodiments, the knitwear in an area of the one or more of the at least one of the outer sole and the midsole is a spacer weft-knitted fabric or a spacer warp-knitted fabric. In these embodiments, the layers of the spacer weft-knitted fabric or the spacer warp-knitted fabric may comprise different yarns.
In some embodiments, the at least one of the outer sole and the midsole comprises the outer sole and the midsole, and the knitwear of the outer sole comprises a weft-knitted or a warp-knitted pocket into which the midsole is inserted.
According to certain embodiments of the present invention, a shoe comprises an upper comprising knitwear, and at least one of an outer sole and a midsole comprising knitwear connected to the upper.
According to certain embodiments of the present invention, a method for the manufacture of a shoe comprising an upper and at least one of an outer sole and a midsole, the method comprises providing the upper, manufacturing the at least one of the outer sole and the midsole, wherein one or more of the at least one of the outer sole and the midsole comprises knitwear, and joining one or more of the at least one of the outer sole and the midsole to the upper of the shoe.
In the following detailed description, embodiments of the invention are described referring to the following figures:
According to certain embodiments of the present invention, a shoe, in particular a sports shoe comprises an upper and an outer sole and/or a midsole that is connected with the upper, whereby the outer sole and/or the midsole comprise knitwear.
When using knitwear for the outer sole and/or the midsole, waste is largely avoided, since the knitwear may be manufactured on a weft-knitting machine or a warp-knitting machine in the required form without the necessity of a subsequent cutting to size.
If the outer sole and/or the midsole comprise knitwear, these may be connected with each other in a particularly easy way. For example, they may be sewn together, so that no adhesive or adhesion promoter is required. The outer sole and the midsole may also be joined by simple heating if the knitwear of the outer sole and/or of the midsole comprises a thermoplastic yarn, which fuses subject to pressure or heat and stiffens when it cools down subsequently.
The use of knitwear for an outer sole and/or a midsole may be beneficial for providing the outer sole and/or the midsole with functional areas. Already during manufacture of the knitwear, for example on a weft-knitting machine or a warp-knitting machine, the corresponding areas may be formed. Flexibility is desired in the area of the forefoot, for example, which may e.g. be achieved by knitting in structures with a joint function. In the midfoot area, in contrast, stability is frequently required, which may e.g. be achieved by correspondingly tighter stitch formation. In the area of the rear foot, in particular in sports shoes, a high degree of cushioning is frequently desired, which may be achieved by thicker knitwear, for example.
In a further example, the thickness of the knitwear may be simply adapted in accordance with the strain in certain areas of the outer sole and/or the midsole by varying the thickness of the yarn, the type of yarn or the yarn material and/or the knit structure. In addition, coarser stitches and/or weft-knitted-in openings in the knitwear may provide air permeability to the foot of a wearer of the shoe from the side of the sole.
The features described above are obtained by using knitwear for an outer sole and/or a midsole of a shoe.
In some embodiments, the upper of the shoe comprises knitwear. Due to this, the upper may be easily joined with the outer sole and/or the midsole, for example by sewing.
In certain embodiments, the upper of the shoe is formed as a one-piece knitwear with the outer sole and/or the midsole. This allows a very simple manufacturing of the whole shoe in one process, for example on a weft-knitting machine or a warp-knitting machine.
In some embodiments, the knitwear has a different binding in the area of the outer sole and/or the midsole than in the area of the upper of the shoe. By the selection of a suitable binding for the upper and the outer sole and/or midsole, respectively, functional areas may be specifically provided. For example, in the area of the outer sole, a more resistant bonding (e.g. the so-called twill weave in non-woven fabrics) could be used, so that the upper adapts easily to the respective foot form. In the upper, hence, a more elastic binding (the so-called tricot binding in warp-knitted fabrics) could be used, so that the upper adapts easily to the respective foot form.
In some embodiments, the upper comprises a first yarn and the knitwear comprises a second yarn in the area of the outer sole and/or the midsole. The selection of suitable yarns allows a functional adaption of the corresponding knitwear. For example, in the area of the outer sole, a rubberized yarn could be used that increases the static friction and hence the traction. In the area of the upper, a yarn that promotes permeability to air, e.g. a yarn with comparatively little volume, could be used.
In some embodiments, the second yarn is thicker than the first yarn. Due to this, the outer sole and/or the midsole becomes thicker as a whole, so that the cushioning characteristics are improved. In the area of the outer sole, in addition, a thicker yarn ensures a longer durability of the outer sole. In contrast, in the area of the upper, a thinner yarn promotes the permeability to air.
In some embodiments, the second yarn is more abrasion-resistant than the first yarn. Thereby, the outer sole and/or the midsole, which are exposed to greater strains as compared to the upper, are rendered more durable and long-lasting. The abrasion-resistant yarn could, for example, be a Kevlar® yarn or other para-aramid synthetic fiber.
In some embodiments, the second yarn is more water-repellent than the first yarn. Thereby, the ingress of water into the outer sole and a midsole that is possibly arranged above is reduced or prevented entirely.
In some embodiments, the knitwear is more permeable to air in the area of the upper than in the area of the outer sole and/or midsole. This promotes the exchange of air between the inside of the shoe and the outside, humid air is transported outwards from the foot and fresh air is supplied to the foot. The outer sole may be weft-knitted or warp-knitted in a more fine-meshed manner, in contrast, in order to keep dirt and water off.
In some embodiments, the knitwear is arranged in the area of the outer sole and/or midsole such that the wales of the knitwear are essentially transverse to a longitudinal axis of the outer sole and/or the midsole. Thereby, the traction is increased in particular in the longitudinal direction, since the transversely arranged wales act like a transversely profiled sole.
In some embodiments, the knitwear comprises stability elements in the area of the outer sole and/or the midsole. Thus, the knitwear comprises stability elements in the area of the outer sole or the midsole. Alternatively, the knitwear comprises stability elements in the area of the outer sole and the midsole. The stability elements may be elements that are directly weft-knitted or warp-knitted into the knitwear and ensure additional stability of the sole.
In some embodiments, the stability elements are ribs, waves or knobs. Ribs, waves or knobs act like a profile and increase the friction and traction of the outer sole. Ribs, waves or knobs in the area of the midsole may engage in corresponding ribs, waves or knobs in the area of the outer sole and so form a particularly stable connection between them. Ribs, waves or nobs on the top of the midsole, i.e. the side facing the foot, may ensure massaging effects of the foot.
In some embodiments, the ribs are arranged essentially transversally to a longitudinal axis of the shoe. Due to this, the traction is increased particularly in the longitudinal direction, since the transverse ribs act like a transversely profiled sole. Moreover, transversely arranged ribs promote the flexing properties of the sole.
In further embodiments of the invention, the knitwear is weft-knitted. Either the knitwear of the outer sole and/or that of the midsole is weft-knitted. Alternatively, the knitwear of the upper is weft-knitted. Further alternatively, the knitwear of the outer sole and/or the knitwear of the midsole as well as the knitwear of the upper is weft-knitted. Knitwear may be weft-knitted in the desired form particularly easily on a suitable machine without producing waste. On flat-knitting machines, the knitwear may furthermore be form-knitted or 3D-knitted.
In further embodiments of the invention, the knitwear is warp-knitted. Either the knitwear of the outer sole and/or that of the midsole is weft-knitted. Alternatively, the knitwear of the upper is warp-knitted. Further alternatively, the knitwear of the outer sole and/or the knitwear of the midsole as well as the knitwear of the upper is warp-knitted. Especially multi-thread warp-knitted fabric allows a particularly fast manufacture due to the use of a plurality of warps.
In some embodiments, the outer sole and/or the midsole are reinforced by a polymer material. Reinforcing polymer material increases the stiffness and stability of the knitwear in the area of the outer sole and/or the midsole. The reinforcing polymer material may be applied in liquid form and dry subsequently. In some embodiments, the polymer material is a thermoplastic polymer material.
In some embodiments, the knitwear comprises a thermoplastic yarn in the area of the outer sole and/or midsole. A thermoplastic yarn may be processed easily and can, for example, be easily weft-knitted into or embroidered onto the knitwear during the manufacture thereof. If the shoe is subsequently heated to above the melting point of the thermoplastic yarn, the latter melts and solidifies during the subsequent cooling. Thereby, the knitwear is reinforced and gains stability.
In certain embodiments, the thermoplastic yarn comprises a low-melting thermoplastic. Due to this, the knitwear may also be adjusted directly to the foot or the cobbler's last.
In some embodiments, a layer of the sole is entirely weft-knitted or warp-knitted from melt yarn. Due to this, a soleplate may be manufactured in an easy manner when this layer is fused and subsequently cools down and hardens. Soleplates are frequently used in shoes in order to distribute forces or to protect the foot from sharp objects such as stones.
In some embodiments, an area of the sole is entirely weft-knitted or warp-knitted from melt yarn. Due to this, a hard element in the sole may be manufactured in an easy manner when the area is fused and subsequently cools down and hardens. For example, the area could be a bone-shaped area that is arranged between the area of the forefoot and the area of the heel and influences torsion of the sole. Such a hard area made from melt yarn may furthermore provide the midfoot area with stability.
In some embodiments, the shoe upper as well as the outer sole or the midsole or both comprise melt yarn.
In some embodiments, the knitwear comprises at least one rubberized yarn in the area of the outer sole. This may e.g. be a full-rubber yarn, a rubber-coated yarn or a rubber-like yarn. Due to this, the abrasion-resistance and the traction of the outer sole is increased.
In some embodiments, the knitwear of the outer sole and/or the midsole was immersed at least partially in a rubber and/or a polymer bath. Through the use of this after-treatment of the knitwear, the friction and the traction (in case of a rubber bath) and the stiffness (in case of a polymer bath) may easily be increased.
In some embodiments, the outer sole and/or the midsole is a spacer weft-knitted fabric or a spacer warp-knitted fabric. A spacer weft-knitted fabric or a spacer warp-knitted fabric shows good cushioning behavior due to its thickness. In some embodiments, the thickness of the spacer weft-knitted fabric may be adapted to the strains expected when wearing the shoe. For example, the spacer weft-knitted fabric or the spacer warp-knitted fabric in the area of the heel could show a greater thickness than in the area of the toes, so as to specifically reduce the strength exerted on the foot when stepping on the ground, e.g. in case of a running shoe. The thickness of the spacer weft-knitted fabric may also vary in the area of the flex lines and e.g. be thinner there so that the foot is able to roll over well. In the midfoot area, the spacer warp-knitted fabric could be rather more fine-meshed so as to achieve higher stiffness.
In some embodiments, the outer sole or the midsole or both comprise a spacer weft-knitted fabric or a spacer warp-knitted fabric only in one area. For example, the outer sole or the midsole or both may comprise a spacer weft-knitted fabric or a spacer warp-knitted fabric only in areas of the heel where high forces are exerted.
In some embodiments, the layers of the spacer weft-knitted fabric or the spacer warp-knitted fabric comprise different yarns. Due to this, the spacer weft-knitted fabric may accomplish different functions within the shoe. For example, the layer facing the foot may comprise moisture-repellent yarn, the layer on the side facing away from the foot may comprise a rubber-like yarn, and the yarn between these layers, i.e. the spacer yarn, may be a strong nylon yarn.
In another area, an intermediate layer of a spacer weft-knitted fabric or spacer warp-knitted fabric comprises stable, e.g. voluminous and/or hollow yarn that may absorb impetuses. The top layer, facing the foot, of the spacer weft-knitted fabric or spacer warp-knitted fabric of the sole, which comes into direct contact with the foot, comprises a humidity-absorbing yarn. The outermost layer of the spacer weft-knitted fabric or the spacer warp-knitted fabric of the sole, which has the function of an outer sole, comprises a hydrophobic yarn.
Alternatively, these three layers of the sole are not manufactured in one piece as a spacer weft-knitted fabric or a spacer warp-knitted fabric but manufactured (e.g. weft-knitted) separately and subsequently joined together (e.g. sewn together).
In certain embodiments, the spaces in the spacer weft-knitted fabric or in the spacer warp-knitted fabric are filled with cushioning materials so as to obtain an additional cushioning. For instance, the spaces could be filled with particle foam, foam inserts and/or additional fibers.
In some embodiments, these cushioning materials are exchangeable, so that the user may adapt the cushioning characteristics to his needs. For example, the knitwear of the midsole could be weft-knitted such that is comprises openings, pouches and/or tunnels that could receive the exchangeable cushioning materials.
In some embodiments, the knitwear of the midsole is weft-knitted so that it comprises at least one pocket. In some embodiments, a material insert is inserted into the at least one pocket. The material insert could e.g. be a foam insert, an air cushion or a gel insert. The at least one pocket may fully or partially surround the material insert. A pocket that fully surrounds the material insert prevents or reduces shifting of the material insert. A material insert inserted into a pocket is environmentally friendly, since it may be disposed of separately from the remainder of the shoe.
In certain embodiments, the thickness and the used yarns of the spacer weft-knitted fabric or the spacer warp-knitted fabric are adapted to the wearer and the purpose of use of the shoe. For example, for a heavier wearer, thicker yarns might also be used and the spacer weft-knitted fabric or spacer warp-knitted fabric could be thicker than in case of a lighter wearer.
In further embodiments, certain materials are weft-knitted or warp-knitted in specific areas of the outer sole and/or the midsole. For example, a rubber yarn or a melt yarn could be weft-knitted or warp-knitted in only in those areas of the outer sole that are most stressed in case of contact with the ground, depending on the rolling-over movement.
In some embodiments, the knitwear of the outer sole comprises a weft-knitted or a warp-knitted pocket on the top, into which the midsole may be inserted. The pocket may e.g. be formed in once piece with the outer sole during weft-knitting or warp-knitting.
According to certain embodiments of the present invention, a method for manufacturing an advantageous shoe as described above, comprising the following steps: a.) providing an upper; b.) manufacturing an outer sole and/or a midsole comprising knitwear; and c.) joining the outer sole and/or the midsole to the upper of the shoe.
In some embodiments, the outer sole or the midsole or both are connected to the upper already during weft-knitting or warp-knitting. For example, the outer sole or the midsole or both may be formed in one piece with the upper. The outer sole or the midsole or both may be weft-knitted or warp-knitted in one piece together with the upper on a weft-knitting machine, e.g. a flat-knitting machine, or a warp-knitting machine.
In other embodiments of the invention, the outer sole or the midsole or both are manufactured separately from the upper and connected to it. For example, the outer sole or the midsole or both may be sewn, glued or welded to the upper or connected to it by linking.
The subject matter of embodiments of the present invention is described here with specificity to meet statutory requirements, but this description is not necessarily intended to limit the scope of the claims. The claimed subject matter may be embodied in other ways, may include different elements or steps, and may be used in conjunction with other existing or future technologies. This description should not be interpreted as implying any particular order or arrangement among or between various steps or elements except when the order of individual steps or arrangement of elements is explicitly described.
In the following, embodiments and variations of the present invention are described in more detail on the basis of an upper for a shoe, in particular a sports shoe.
The use of knitwear allows products such as an upper or a sole of a shoe, such as an insole, strobel sole, midsole and/or outer sole to be equipped with areas having different characteristics and providing different functions with low production effort. The properties include bendability, stretchability (expressed as Young's modulus, for example), permeability to air and water, thermoconductivity, thermal capacity, moisture absorption, static friction, abrasion resistance, hardness, and thickness, for example.
Various techniques are applied in order to achieve such characteristics or functions, which will be described in the following. Such suitable techniques in manufacturing knitwear include knitting techniques, the selection of fibers and yarns, coating the fibers, yarns or knitwear with polymer or other materials, the use of monofilaments, the combination of monofilaments and polymer coating, the application of fuse/melt yarns, and multi-layer textile material. In general, the yarns used for the manufacture of knitwear may be equipped, i.e. coated accordingly. In addition or alternatively, the finished knitwear may be equipped accordingly.
Another aspect of providing functions concerns the specific use of knitwear for certain areas of a product, for example of an upper or a sole, and the connection of different parts by suitable connection techniques. The mentioned aspects and techniques as well as other aspects and techniques will be explained in the following.
The described techniques may be used individually or they may be combined in any manner.
Knitwear
Knitwear used in the present invention is divided into weft-knitted fabrics and single-thread warp-knitted fabrics on the one hand and multi-thread warp-knitted fabrics on the other hand. The distinctive characteristic of knitwear is that it is formed of interlocking yarn or thread loops. These thread loops are also referred to as stitches and may be formed of one or several yarns or threads.
Yarn or thread are terms for a structure of one or several fibers which is long in relation to its diameter. A fiber is a flexible structure which is rather thin in relation to its length. Very long fibers, of virtually unlimited length with regard to their use, are referred to as filaments. Monofilaments are yarns formed of one single filament, that is, one single fiber.
In weft-knitted fabrics and single-thread warp-knitted fabrics, the stitch formation requires at least one thread or yarn, with the thread running in longitudinal direction of the product, i.e. substantially at a right angle to the direction in which the product is made during the manufacturing process. In multi-thread warp-knitted fabrics, the stitch formation requires at least one warp sheet, i.e. a plurality of so-called warps. These stitch-forming threads run in longitudinal direction, i.e. substantially in the direction in which the product is made during the manufacturing process.
Certain embodiments of a weft-knitted fabric that may be used for the present invention with a filler yarn 15 is shown in
Multi-thread warp-knitted fabric 13 is created by warp-knitting with many threads from top down, as shown in
By way of example, the interlaces tricot 21, 2×1 plain 22, and atlas 23 are shown in
Stitches arranged above each other with joint binding sites are referred to as wales.
Three basic weft-knitted structures are known in weft-knitted fabrics, which may be recognized by the run of the stitches along a wale. With plain, single Jersey, only back loops may be recognized along a wale on one side of the fabric and only back loops may be recognized along the other side of the product. This structure is created on one row of needles of a knitting machine, i.e. an arrangement of neighboring knitting needles, and also referred to as single Jersey. With rib fabric, front and back loops alternate within a course, i.e. either only front or back loops may be found along a wale, depending on the side of the product from which the wale is considered. This structure is created on two rows of needles with needles offset opposite each other. With purl fabric, front and back loops alternate in one wale. Both sides of the product look the same. This structure is manufactured using latch needles as illustrated in
In many embodiments, a variety of structures and surfaces that may be created with knitwear, which may or may not also be possible with weaving. It is possible to manufacture both very heavy and/or stiff knitwear and very soft, transparent and/or stretchable knitwear with substantially the same manufacturing technique. The parameters by which the properties of the material may be influenced substantially are the pattern of weft-knitting or warp-knitting, the used yarn, the needle size or the needle distance, and the tensile strain subject to which the yarn is placed on the needles.
In certain embodiments of weft-knitting, yarns may be weft-knitted in at freely selectable places. In this manner, selected zones may be provided with certain properties. For example, an upper for a soccer shoe may be provided with zones made from rubberized yarn in order to achieve higher static friction and thus enable the player to better control the ball. With certain yarns being weft-knitted in at selected places, no additional elements have to be applied.
Knitwear is manufactured on machines in the industrial context. These machines usually comprise a plurality of needles. In weft-knitting, latch needles 41 are usually used, which may comprise a moveable latch 42, as illustrated in
A differentiation is made between flat-knitting and circular-knitting machines. In flat-knitting machines, a thread feeder feeds the thread back and forth along a row of needles. In a circular-knitting machine, the needles are arranged in a circular manner and the thread feeding correspondingly takes place in a circular movement along one or more round rows of needles.
Instead of a single row of needles, it is also possible for a knitting machine to comprise two parallel rows of needles. When looked at from the side, the needles of the two rows of needles may, for example, be opposite each other at a right angle. This enables the manufacture of more elaborate structures or weaves. The use of two rows of needles allows the manufacture of a one-layered or two-layered weft-knitted fabric. A one-layered weft-knitted fabric is created when the stitches generated on the first row of needles are enmeshed with the stitches generated on the second row of needles. Accordingly, a two-layered weft-knitted fabric is created when the stitches generate on the first row of needles are not or only selectively enmeshed with the stitches generated on the second row of needles and/or if they are merely enmeshed at the end of the weft-knitted fabric. If the stitches generated on the first row of needles are loosely enmeshed only selectively with the stitches generated on the second row of needles by an additional yarn, this is also referred to as spacer weft-knitted fabric. The additional yarn, for example a monofilament, is thus guided back and forth between two layers, so that a distance between the two layers is created. The two layers may e.g. be connected to each other via a so-called tuck stitch.
Generally, the following weft-knitted fabrics may thus be manufactured on a weft-knitting machine: If only one row of needles is used, a one-layered weft-knitted fabric may be created. When two rows of needles are used, the stitches of both rows of needles may consistently be connected to each other so that the resulting knitwear comprises a single layer. If the stitches of both rows of needles are not connected or only connected at the edge when two rows of needles are used or are only selectively connected in certain locations, two layers are created. If the stitches of both rows of needles are connected selectively in turns by an additional thread, a spacer weft-knitted fabric is created. The additional thread is also referred to as spacer thread and it may be fed via a separate yarn feeder.
In certain embodiments, single-thread warp-knitted fabrics may be manufactured by jointly moved needles. In other embodiments, single-thread warp-knitted fabrics needles may be manufactured by fixing the needles and moving the fabric to create the relative motion between the needles and the fabric. In contrast to weft-knitting, the needles are typically not moved individually. Similar to weft-knitting, there are flat single thread warp-knitting and circular single thread warp-knitting machines.
In multi-thread warp-knitting, one or several coiled threads, i.e. threads which are coiled next to one another, are used. In stitch formation, the individual warps are placed around the needles and the needles are moved jointly.
The techniques described herein as well as further aspects of the manufacture of knitwear may be found in “Fachwissen Bekleidung”, 6th ed. by H. Eberle et al. (published with the title “Clothing Technology” in English), in “Textil-und Modelexikon”, 6th ed. by Alfons Hofer and in “Maschenlexikon”, 11th ed. by Walter Holthaus, for example.
Three-Dimensional Knitwear
Three-dimensional (3D) knitwear may also be manufactured on weft-knitting machines and warp-knitting machines, particularly on flat-knitting machines. This is knitwear comprises a spatial structure although it is weft-knitted or warp-knitted in a single process. A three-dimensional weft-knitting or warp-knitting technique allows for spatial knitwear to be manufactured without seams, cut or manufacture in one piece and in a single process.
Three-dimensional knitwear may, for example, be manufactured by varying the number of stitches in the direction of the wales by partial courses being formed. The corresponding mechanical process is referred to as “needle parking”. Depending on the requirement, this technique may be combined with structural variations and/or variations of the number of stitches in the direction of the course. When partial courses are formed, stitch formation temporarily occurs only along a partial width of the weft-knitted fabric or warp-knitted fabric. The needles which are not involved in the stitch formation keep the half stitches (“needle parking”) until weft-knitting occurs again at this position. In this way, it is possible to form bulges, for example.
By three-dimensional weft-knitting or warp-knitting, an upper may be adjusted to the cobbler's last or the foot and a sole may be profiled, for example. The tongue of a shoe may e.g. be weft-knitted into the right shape. Contours, structures, knobs, curvatures, notches, openings, fasteners, loops and pockets may be integrated into the knitwear in a single process.
Three-dimensional knitwear may be used for the present invention in an advantageous manner.
Functional Knitwear
According to certain embodiments of the present invention, knitwear and particularly weft-knitted fabric may be provided with a range of functional properties and used in the present invention.
It is possible using a weft-knitting technique to manufacture knitwear having different functional areas and simultaneously maintaining its contours. The structures of knitwear may be adjusted to functional requirements in certain areas, by the stitch pattern, the yarn, the needle size, the needle distance or the tensile strain subject to which the yarn is placed on the needles being selected accordingly.
It is possible, for example, to include structures with large stitches or openings within the knitwear in areas in which airing is desired. In contrast, in areas in which support and stability are desired, fine-meshed stitch patterns, stiffer yarns or even multi-layered weft-knitting structures may be used, which will be described in the following. In the same manner, the thickness of the knitwear is variable.
Knitwear having more than one layer provides numerous possible constructions for the knitwear, which provide many advantages. Knitwear with more than one layer, e.g. two, may be weft-knitted or warp-knitted on a weft-knitting machine or a warp-knitting machine with several rows of needles, e.g. two, in a single stage, as described in the section “knitwear” above. Alternatively, several layers, e.g. two, may be weft-knitted or warp-knitted in separate stages and then placed above each other and connected to each other if applicable, e.g. by sewing, gluing, welding or linking.
Several layers fundamentally increase solidness and stability of the knitwear. In this regard, the resulting solidness depends on the extent to which and the techniques by which the layers are connected to each other. The same yarn or different yarns may be used for the individual layers. For example, it is possible in a weft-knitted fabric for one layer to be weft-knitted from multi-fiber yarn and one layer to be weft-knitted from monofilament, whose stitches are enmeshed. In particular, stretchability of the weft-knitted layer is reduced due to this combination of different yarns. In this construction, a layer made from monofilament may be arranged between two layers made from multi-fiber yarn in order to reduce stretchability and increase solidness of the knitwear. This results in a pleasant surface made from multi-fiber yarn on both sides of the knitwear.
An alternative of two-layered knitwear is referred to as spacer weft-knitted fabric or spacer warp-knitted fabric, as explained in the section “knitwear”. In this regard, a spacer yarn is weft-knitted or warp-knitted more or less loosely between two weft-knitted or warp-knitted layers, interconnecting the two layers and simultaneously serving as a filler. The spacer yarn may comprise the same material as the layers themselves, e.g. polyester or another material. The spacer yarn may also be a monofilament which provides the spacer weft-knitted fabric or spacer warp-knitted fabric with stability.
Such spacer weft-knitted fabrics or spacer warp-knitted fabrics, respectively, which are also referred to as three-dimensional weft-knitted fabrics, which are differentiated from the formative 3D weft-knitted fabrics or 3D warp-knitted fabrics mentioned in the section “three-dimensional knitwear” above, may be used wherever additional cushioning or protection is desired, e.g. at the upper or the tongue of an upper or in certain areas of a sole. Three-dimensional structures may also serve to create spaces between neighboring textile layers or also between a textile layer and the foot and thus ensure airing. Moreover, the layers of a spacer weft-knitted fabric or a spacer warp-knitted fabric may comprise different yarns depending on the position of the spacer weft-knitted fabric on the foot.
The thickness of a spacer weft-knitted fabric or a spacer warp-knitted fabric may be set in different areas depending on the function or the wearer. Various degrees of cushioning may be achieved with areas of various thicknesses, for example. Thin areas may increase bendability, for example, thus fulfilling the function of joints or flex lines.
Moreover, the layers of a spacer weft-knitted fabric may comprise different yarns depending on the position of the spacer weft-knitted fabric on the foot. In this way, knitwear may be provided with two different colors for the front and the back, for example. An upper made from such knitwear may then comprise a different color on the outside than on the inside.
Other multi-layered constructions may include pockets or tunnels, in which two textile layers or knitwear weft-knitted or warp-knitted on two rows of needles are connected to each other only in certain areas so that a hollow space is created. Alternatively, items of knitwear weft-knitted or warp-knitted in two separate processes are connected to each other such that a void is created, e.g. by sewing, gluing, welding or linking. It is then possible to introduce a cushioning material such as a foam material, eTPU (expanded thermoplastic urethane), ePP (expanded polypropylene), expanded EVA (ethylene vinyl acetate) or particle foam, an air or gel cushion for example, through an opening, e.g. at the tongue, the upper, the heel, the sole or in other areas. Alternatively or additionally, the pocket may also be filled with a filler thread or a spacer knitwear. It is furthermore possible for threads to be pulled through tunnels, for example as reinforcement in case of tension loads in certain areas of an upper. Moreover, it is also possible for the laces to be guided through such tunnels. Moreover, loose threads may be placed into tunnels or pockets for padding, for example in the area of the ankle. However, it is also possible for stiffer reinforcing elements, such as caps, flaps or bones to be inserted into tunnels or pockets. These may be manufactured from plastic such as polyethylene, TPU, polyethylene or polypropylene, for example.
A further possibility for a functional design of knitwear is the use of certain variations of the basic weaves. In weft-knitting, it is possible for bulges, ribs or waves to be weft-knitted in certain areas, for example, in order to achieve reinforcement in these places. A wave may, for example, be created by stitch accumulation on a layer of knitwear. This means that more stitches are weft-knitted or warp-knitted on one layer than on another layer. Alternatively, different stitches are weft-knitted fabric on the one layer than on the other layer, e.g. by being weft-knitted fabric tighter, wider or using a different yarn. Thickening is caused in both alternatives.
Ribs, waves, or similar patterns may, for example, also be used at the bottom of a weft-knitted outer sole of a shoe in order to provide a tread and provide the shoe with better non-slip properties. In order to obtain a rather thick weft-knitted fabric, for example, it is possible to use the weft-knitting techniques “tuck” or “half cardigan”, which are described in “Fachwissen Bekleidung”, 6th ed. by H. Eberle et al., for example.
Waves may be weft-knitted or warp-knitted such that a connection is created between two layers of a two-layered knitwear or such that no connection is created between the two layers. A wave may also be weft-knitted as a right-left wave on both sides with or without a connection of the two layers. A structure in the knitwear may be achieved by an uneven ration of stitches on the front or the back of the knitwear.
A further possibility of functionally designing knitwear within the framework of the present invention is providing openings in the knitwear already during weft-knitting or warp-knitting. Embodiments in the course of the present invention, which may be combined with other embodiments, refer to an insole that comprises knitwear. The embodiments may also be applied to a strobel sole, however. The embodiments may equally be applied to an outer sole. An insole, strobel sole, or outer sole is generally arranged above a midsole. The midsole may comprise cushioning properties. The midsole may e.g. comprise a foam material. Other suitable materials are eTPU (expanded thermoplastic urethane), ePP (expanded polypropylene), expanded EVA (ethylene vinyl acetate) or particle foam, for example.
The knitwear of the insole, strobel sole, or outer sole comprises at least one opening which is weft-knitted or warp-knitted in already during weft-knitting or warp-knitting of the knitwear, respectively. The at least one opening enables the foot of a wearer of a shoe to be able to directly touch the midsole. This improves the cushioning properties of the shoe on the whole, so that the thickness of the midsole may be reduced.
In some embodiments, the at least one opening is arranged in the area of the calcaneus. An arrangement in this position has a particularly positive effect on the cushioning properties. A different position of the at least one opening is also possible.
In certain embodiments, functionally designing knitwear within the framework may include forming laces integrally with the knitwear of an upper. In these embodiments, the upper comprises knitwear and the laces are warp-knitted or weft-knitted as one piece with the knitwear already when the knitwear of the upper is weft-knitted or warp-knitted. In this regard, a first end of a lace is connected to the knitwear, while a second end is free.
In some embodiments, the first end is connected to the knitwear of the upper in the area of the transition from the tongue to the area of the forefoot of the upper. In these embodiments, a first end of a first lace may be connected to the knitwear of the upper at the medial side of the tongue and a first end of a second lace is connected to the knitwear of the upper at the lateral side of the tongue. The respective second ends of the two laces may then be pulled through lace eyelets for tying the shoe.
A possibility of speeding up the integral weft-knitting or warp-knitting of laces is having all yarns used for weft-knitting or warp-knitting knitwear end in the area of the transition from the tongue to the area of the forefoot of the upper. In some embodiments, the yarns may end in the medial side of the upper on the medial side of the tongue and form the lace connected on the medial side of the tongue. In certain embodiments, the yarns may end in the lateral side of the upper on the lateral side of the tongue and form the lace connected to the lateral side of the tongue. The yarns may then be cut off at a length that is sufficiently long for forming laces. The yarns may be twisted or intertwined, for example. The respective second end of the laces may be provided with a lace clip. Alternatively, the second ends are fused or provided with a coating.
The knitwear is particularly stretchable in the direction of the stitches (longitudinal direction) due to its construction. This stretching may be reduced e.g. by subsequent polymer coating of the knitwear. The stretching may also be reduced during manufacture of the knitwear itself. One possibility is reducing the mesh openings, that is, using a smaller needle size. Smaller stitches generally result in less stretching of the knitwear. Fine-meshed knitwear may e.g. be used at an upper (also referred to as shoe upper). Moreover, the stretching of the knitwear may be reduced by weft-knitted reinforcements, e.g. three-dimensional structures. Such structures may be arranged on the inside or the outside of an upper. Furthermore, non-stretchable yarn, e.g. made from nylon, may be laid in a tunnel along the knitwear in order to limit stretching to the length of the non-stretchable yarn.
Colored areas with several colors may be created by using a different thread and/or by additional layers. In transitional areas, smaller mesh openings (smaller needle sizes) are used in order to achieve a fluent passage of colors.
Further effects may be achieved by weft-knitted insets (inlaid works) or Jacquard knitting. Inlaid works are areas which only provide a certain yarn, e.g. in a certain color. Neighboring areas which may comprise a different yarn, for example in a different color, are then connected to each other by a so-called tuck stitch.
During Jacquard knitting, two rows of needles are used and two different yarns run through all areas, for example. However, in certain areas only one yarn appears on the visible side of the product and the respective other yarn runs invisibly on the other side of the product.
A product manufactured from knitwear may be manufactured in one piece on a weft-knitting machine or a warp-knitting machine. Functional areas may then already be manufactured during weft-knitting or warp-knitting by corresponding techniques as described here.
Alternatively, the product may be combined from several parts of knitwear and it may also comprise parts that are not manufactured from knitwear. In this regard, the parts of knitwear may each be designed separately with different functions, for example regarding thickness, isolation, transport of moisture, etc.
An upper and/or a sole may, for example, be generally manufactured from knitwear as a whole or it may be put together from different parts of knitwear. A whole upper or parts of that may, for example, be separated, e.g. punched, from a larger piece of knitwear. The larger piece of knitwear may, for example, be a circular weft-knitted fabric or a circular warp-knitted fabric or a flat weft-knitted fabric or a flat warp-knitted fabric.
For example, a tongue may be manufactured as a continuous piece and connected with the upper subsequently, or it may be manufactured in one piece with the upper. With regard to their functional designs, ridges on the inside may e.g. improve flexibility of the tongue and ensure that a distance is created between the tongue and the foot, which provides additional airing. Laces may be guided through one or several weft-knitted tunnels of the tongue. The tongue may also be reinforced with polymer in order to achieve stabilization of the tongue and e.g. prevent a very thin tongue from convolving. Moreover, the tongue may then also be fitted to the shape of the cobbler's last or the foot.
In an upper, it is possible for only the front part to be manufactured from knitwear, for example. The remainder of the upper may comprise a different textile and/or material, such as a woven fabric, for example. The front part may e.g. be located only in the area of the toes, extend beyond the toe joints or into the midfoot area. Alternatively, the back part of an upper may be manufactured from knitwear in the area of the heel, for example, and e.g. be additionally reinforced with polymer coating. In general, any desired areas of an upper or a sole may be manufactured as knitwear.
Applications such as polyurethane (PU) prints, thermoplastic polyurethane (TPU) ribbons, textile reinforcements, leather, etc., may be applied to knitwear subsequently. Thus, in an upper which comprises knitwear in its entirety or in parts, a plastic heel or toe cap as reinforcement or logos and eyelets for laces may be applied on the upper, for example by sewing, gluing or welding, as described below.
Sewing, gluing or welding, for example, constitute suitable connection techniques for connecting individual knitwear with other textiles or with other knitwear. Linking is another possibility for connecting two pieces of knitwear. Therein, two edges of knitwear are connected to each other according to the stitches (usually stitch by stitch).
A possibility for welding textiles, particularly ones made from plastic yarns or threads, is ultrasonic welding. Therein, mechanical oscillations in the ultrasonic frequency range are transferred to a tool referred to as a sonotrode. The oscillations are transferred to the textiles to be connected by the sonotrode under pressure. Due to the resulting friction, the textiles are heated up, softened and ultimately connected in the area of the place of contact with the sonotrode. Ultrasonic welding allows rapidly and cost-effectively connecting particularly textiles with plastic yarns or threads. It is possible for a ribbon to be attached, for example glued, to the weld seam, which additionally reinforces the weld seam and is optically more appealing. Moreover, wear comfort is increased since skin irritations—especially at the transition to the tongue—are avoided.
Connecting various textile areas may occur at quite different locations. For example, the seams for connecting various textile areas of an upper may be arranged at various positions, as shown in
In certain embodiments, adhesive tape may be used to connect textile areas. This feature may also be used in addition to an existing connection, e.g. over a sewn seam or a welded seam. An adhesive tape may fulfill further functions in addition to the function of connecting, such as e.g. protection against dirt or water. An adhesive tape may comprise properties which change over its length.
Embodiments of an upper 51 connected to a shoe sole 61 using adhesive tape are shown in
The shoe sole 61 may be an outer sole or a midsole. The upper 51 and the shoe sole 61 are connected to each other by a surrounding adhesive tape 62. The adhesive tape 62 may be of varying flexibility along its length. For example, the adhesive tape 62 might be particularly rigid and not very flexible in the shoe's heel area in order to provide the shoe with the necessary stability in the heel area. This may be achieved by varying the width and/or the thickness of the adhesive tape 62, for example. The adhesive tape 62 may generally be constructed such that it is able to receive certain forces in certain areas along the tape. In this way, the adhesive tape 62 does not only connect the upper to the sole but simultaneously fulfills the function of structural reinforcement.
Fibers
The yarns or threads, respectively, used for knitwear of the present invention usually comprise fibers. As was explained above, a flexible structure which is rather thin in relation to its length is referred to as a fiber. Very long fibers, of virtually unlimited length with regard to their use, are referred to as filaments. Fibers are spun or twisted into threads or yarns. Fibers may also be long, however, and twirled into a yarn. Fibers may include natural or synthetic materials. Natural fibers are environmentally friendly, since they are compostable. Natural fibers include cotton, wool, alpaca, hemp, coconut fibers or silk, for example. Among the synthetic fibers are polymer-based fibers such as nylon, polyester, elastane, or spandex, respectively, or Kevlar® or other para-aramid synthetic fiber, which may be produced as classic fibers or as high-performance fibers or technical fibers.
It is conceivable that a shoe be assembled from various parts, with a weft-knitted or a warp-knitted part comprising natural yarn made from natural fibers and a removable part, e.g. the insole, comprising plastic, for example. In this manner, both parts may be disposed of separately. In this example, the weft-knitted part could be directed to compostable waste, whereas the insole could be directed to recycling of reusable materials, for example.
The mechanical and physical properties of a fiber and the yarn manufactured therefrom are also determined by the fiber's cross-section, as illustrated in
A fiber having the circular cross-section 710 may either be solid or hollow. A solid fiber is the most frequent type, it allows easy bending and is soft to the touch. A fiber as a hollow circle with the same weight/length ratio as the solid fiber has a larger cross-section and is more resistant to bending. Examples of fibers with a circular cross-section are nylon, polyester, and Lyocell.
A fiber having the bone-shaped cross-section 730 has the property of wicking moisture. Examples for materials for such fibers are acrylic and spandex. The concave areas in the middle of the fiber support moisture being passed on in the longitudinal direction, with moisture being rapidly wicked from a certain place and distributed.
The following further cross-sections are illustrated in
Individual fibers with their properties which are relevant for the manufacture of knitwear for the present invention will be described in the following:
A plurality of different yarns may be used for the manufacture of knitwear according to certain embodiments in the present invention. As was already defined, a structure of one or several fibers which is long in relation to its diameter is referred to as a yarn.
Functional yarns are capable of transporting moisture and thus of absorbing sweat and moisture. They may be electrically conducting, self-cleaning, thermally regulating and insulating, flame resistant, and UV-absorbing, and may enable infrared radiation. They may be suitable for sensors. Antibacterial yarns, such as silver yarns, for example, prevent odor formation.
Stainless steel yarn contains fibers made of a blend of nylon or polyester and steel. Its properties include high abrasion resistance, high cut resistance, high thermal abrasion, high thermal and electrical conductivity, higher tensile strength and high weight.
In textiles made from knitwear, electrically conducting yarns may be used for the integration of electronic devices. These yarns may, for example, forward impulses from sensors to devices for processing the impulses, or the yarns may function as sensors themselves, and measure electric streams on the skin or physiological magnetic fields, for example. Examples for the use of textile-based electrodes may be found in European patent application EP 1 916 323.
Melt yarns may be a mixture of a thermoplastic yarn and a non-thermoplastic yarn. There are substantially three types of melt yarns: a thermoplastic yarn surrounded by a non-thermoplastic yarn; a non-thermoplastic yarn surrounded by thermoplastic yarn; and pure melt yarn of a thermoplastic material. After being heated to the melting temperature, thermoplastic yarn fuses with the non-thermoplastic yarn (e.g. polyester or nylon), stiffening the knitwear. The melting temperature of the thermoplastic yarn is determined accordingly and it is usually lower than that of the non-thermoplastic yarn in case of a mixed yarn.
A shrinking yarn is a dual-component yarn. The outer component is a shrinking material, which shrinks when a defined temperature is exceeded. The inner component is a non-shrinking yarn, such as polyester or nylon. Shrinking increases the stiffness of the textile material.
A further yarn for use in knitwear are luminescent or reflecting yarns and so-called “intelligent” yarns. Examples of intelligent yarns are yarns which react to humidity, heat or cold and alter their properties accordingly, e.g. contracting and thus making the stitches smaller or changing their volume and thus increasing permeability to air. Yarns made from piezo fibers or yarn coated with a piezo-electrical substance are able to convert kinetic energy or changes in pressure into electricity, which may provide energy to sensors, transmitters or accumulators, for example.
Yarns may furthermore generally be reworked, e.g. coated, in order to maintain certain properties, such as stretching, color or humidity resistance.
Polymer Coating
Due to its structure, weft-knitted or warp-knitted knitwear is considerably more flexible and stretchable than weaved textile materials. For certain applications and requirements, e.g. in certain areas of an upper or a sole according to the present invention, it is therefore necessary to reduce flexibility and stretchability in order to achieve sufficient stability.
For that purpose, a polymer layer may be applied to one side or both sides of knitwear (weft-knit or warp-knit goods), but generally also to other textile materials. Such a polymer layer causes a reinforcement and/or stiffening of the knitwear. In an upper it may e.g. serve the purpose of supporting and/or stiffening and/or reducing elasticity in the toe area, in the heel area, along the lace eyelets, on lateral and/or medial surfaces or in other areas. Furthermore, elasticity of the knitwear and particularly stretchability are reduced. Moreover, the polymer layer protects the knitwear against abrasion. Furthermore, it is possible to give the knitwear a three-dimensional shape using the polymer coating by compression-molding.
In the first step of polymer coating, the polymer material may applied to one side of the knitwear. It may also be applied on both sides, however. The material may be applied by spraying, knife coating, laying, printing, sintering, ironing or spreading. If it is polymer material in the form of a film, the latter is placed on the knitwear and connected with the knitwear by heat and pressure, for example. Spraying may be carried out by a tool similar to a hot glue gun. Spraying enables the polymer material to be applied evenly in thin layers. Moreover, spraying is a fast method. Effect pigments such as color pigments, for example, may be mixed into the polymer coating.
According to certain embodiments, the polymer is applied in at least one layer with a thickness of 0.2-1 mm. One or several layers may be applied, with it being possible for the layers to be of different thicknesses and/or colors. Between neighboring areas with polymer coating of various thicknesses there may be continuous transitions from areas with a thin polymer coating to areas with a thick polymer coating. In the same manner, different polymer materials may be used in different areas, as will be described in the following.
During application, polymer material attaches itself to the points of contact or points of intersection, respectively, of the yarns of the knitwear, on the one hand, and to the gaps between the yarns, on the other hand, forming a closed polymer surface on the knitwear after the processing steps described in the following. However, in case of larger mesh openings or holes in the textile structure, this closed polymer surface may also be intermittent, e.g. so as to enable airing. This also depends on the thickness of the applied material: The more thinly the polymer material is applied, the easier it is for the closed polymer surface to be intermittent. Moreover, the polymer material may also penetrate the yarn and soak it and thus contributes to its stiffening.
After application of the polymer material, the knitwear is pressed in a press under heat and pressure. The polymer material liquefies in this step and fuses with the yarn of the textile material.
In a further optional step, the knitwear may be pressed into a three-dimensional shape in a machine for compression-molding. For example, the area of the heel or the area of the toes of an upper may be shaped three-dimensionally over a cobbler's last. Alternatively, the knitwear may also be directly fitted to a foot.
After pressing and molding, the reaction time until complete stiffening may be one to two days, depending on the used polymer material.
The following polymer materials may be used: polyester; polyester-urethane pre-polymer; acrylate; acetate; reactive polyolefins; co-polyester; polyamide; co-polyamide; reactive systems (mainly polyurethane systems reactive with H2O or O2); polyurethanes; thermoplastic polyurethanes; and polymeric dispersions.
A suitable range for viscosity of the polymer material is 50-80 Pa s (pascal second) at 90-150° C., which may further include a range of 15-50 Pa s (pascal second) at 110-150° C.
A suitable range for the hardness of the hardened polymer material is 40-60 Shore D. Depending on the application, other ranges of hardness are also conceivable.
The described polymer coating may be used sensibly wherever support functions, stiffening, increased abrasion resistance, elimination of stretchability, increase of comfort and/or fitting to prescribed three-dimensional geometries are desired. It is also conceivable to fit e.g. an upper to the individual shape of the foot of the person wearing it, by polymer material being applied to the upper and then adapting to the shape of the foot under heat.
Monofilaments for Reinforcement
As was already defined, a monofilament is a yarn formed by one single filament, that is, one single fiber. Therefore, in certain embodiments, stretchability of monofilaments is considerably lower than that of yarns which are manufactured from many fibers. This also reduces the stretchability of knitwear that is manufactured from monofilaments or include monofilaments and which are used in the present invention. Monofilaments are typically made from polyamide. However, other materials, such as polyester or a thermoplastic material, would also be conceivable.
So whereas knitwear made from a monofilament is considerably more rigid and less stretchable, this knitwear may not include the desired surface properties, such as e.g. smoothness, colors, transport of moisture, outer appearance and variety of textile structures as usual knitwear has. This disadvantage is overcome by the knitwear described in the following.
A monofilament may also be melted slightly in order to connect with the layer of the first yarn and limit stretching even more. The monofilament then fuses with the first yarn at the points of contact and fixates the first yarn with respect to the layer made from monofilament.
Combination of Monofilaments and Polymer Coating
The weft-knitted fabric having two layers described in the preceding section may additionally be reinforced by a polymer coating as was already described in the section “polymer coating”. The polymer material is applied to the weft-knitted layer made from monofilament. In doing so, it does not connect to the material (e.g. polyamide material) of the monofilament, since the monofilament has a very smooth and round surface, but substantially penetrates the underlying first layer of a first yarn (e.g. polyester yarn). During subsequent pressing, the polymer material therefore fuses with the yarn of the first layer and reinforces the first layer. In doing so, the polymer material has a lower melting point than the first yarn of the first layer and the monofilament of the second layer. The temperature during pressing is selected such that only the polymer material melts but not the monofilament or the first yarn.
Melt Yarn
For reinforcement and for the reduction of stretching, the yarn of the knitwear which is used according to the invention may additionally or alternatively also be a melt yarn that fixes the knitwear after pressing. There are substantially three types of melt yarns: a thermoplastic yarn surrounded by a non-thermoplastic yarn; a non-thermoplastic yarn surrounded by thermoplastic yarn; and pure melt yarn of a thermoplastic material. In order to improve the bond between thermoplastic yarn and the non-thermoplastic yarn, it is possible for the surface of the non-thermoplastic yarn to be texturized.
In certain embodiments, pressing takes place at a temperature ranging from 110 to 150° C., and may further be approximately 130° C. The thermoplastic yarn melts at least partially in the process and fuses with the non-thermoplastic yarn. After pressing, the knitwear is cooled, so that the bond is hardened and fixed. The melt yarn may be arranged in the upper and/or the sole.
In some embodiments, the melt yarn is weft-knitted into the knitwear. In case of several layers, the melt yarn may be weft-knitted into one, several or all layers of the knitwear.
In certain embodiments, the melt yarn may be arranged between two layers of knitwear. In doing so, the melt yarn may simply be placed between the layers. Arrangement between the layers has the advantage that the mold is not stained during pressing and molding, since there is no direct contact between the melt yarn and the mold.
Thermoplastic Textile for Reinforcement
A further possibility for reinforcing knitwear that is used for the present invention, for example in an upper and/or a sole, is the use of a thermoplastic textile. This is a thermoplastic woven fabric or thermoplastic knitwear. A thermoplastic textile melts at least partially when subjected to heat and stiffens as it cools down. A thermoplastic textile may, for example, be applied to the surface of an upper or a sole, which may comprise knitwear, for example, by applying pressure and heat. When it cools down, the thermoplastic textile stiffens and specifically reinforces the upper or the sole in the area in which it was placed, for example.
The thermoplastic textile may be specifically manufactured for the reinforcement in its shape, thickness and structure. Additionally, its properties may be varied in certain areas. The stitch structure, the knitting stitch, and/or the yarn used may be varied such that different properties are achieved in different areas.
According to certain embodiments, a thermoplastic textile is a weft-knitted fabric or warp-knitted fabric made from thermoplastic yarn. Additionally, the thermoplastic textile may also comprise a non-thermoplastic yarn. The thermoplastic textile may be applied to an upper or a sole of a shoe, for example, by pressure and heat.
A woven fabric whose wefts and/or warps are thermoplastic are other embodiments of a thermoplastic textile. Different yarns may be used in the weft direction and the warp direction of the thermoplastic woven fabric, so as to achieve different properties, such as stretchability, in the weft direction and the warp direction.
A spacer weft-knitted fabric or spacer warp-knitted fabric made from thermoplastic material are other embodiments of a thermoplastic textile. In this regard, e.g. only one layer may be thermoplastic, e.g. so as to be attached to an upper or a sole. Alternatively, both layers are thermoplastic, e.g. in order to connect the sole to the upper.
A thermoplastic weft-knitted fabric or warp-knitted fabric may be manufactured using the manufacturing techniques for knitwear described in the section “knitwear”.
A thermoplastic textile may be connected with the surface to be reinforced only partially subject to pressure and heat so that only certain areas or only a certain area of the thermoplastic textile connects to the surface. Other areas or another area do not connect, so that the permeability for air and/or humidity is maintained there, for example. The function and/or the design of e.g. an upper or a sole may be modified by this.
Shoe Comprising Knitwear
The shoe 91 may, in addition, comprise a midsole (not shown in
In further embodiments, the outer sole 92 is formed as one-piece knitwear together with the midsole. Such one-piece knitwear may, for example, be manufactured on a weft-knitting machine or a warp-knitting machine with two rows of needles, whereby the outer sole 92 and the midsole are weft-knitted or warp-knitted on different rows of needles. The outer sole 92 and the midsole may already be joined at the edge or over their entire surface during weft-knitting or warp-knitting.
The outer sole 92 and the midsole may also be a spacer weft-knitted fabric or a spacer warp-knitted fabric, as e.g. described in the sections “knitwear” and “functional knitwear” above, whose first layer represents the outer sole and whose second layer represents the midsole. The yarn between the two layers then provides an additional cushioning and thus assumes the function of a midsole.
Alternatively, the midsole comprises a spacer weft-knitted fabric or a spacer warp-knitted fabric. The outer sole 92 may then be weft-knitted or warp-knitted or it may also not comprise any knitwear. The outer sole 92 may be water-repellent, dirt-repellent, and/or slip-resistant. The first layer of the spacer weft-knitted fabric or spacer warp-knitted fabric of the midsole ensures cushioning depending on its thickness. The second layer of the spacer weft-knitted fabric or spacer warp-knitted fabric of the midsole constitutes the strobel sole or directly the outsole. In these embodiments, the foot stands directly on the second layer of the spacer weft-knitted fabric or the spacer warp-knitted fabric. The second layer may comprise a humidity-absorbing yarn and additionally or alternatively an antibacterial and/or odor-inhibiting yarn, e.g. a silver yarn. Alternatively, the second layer may be formed entirely or almost entirely from melt yarn. When the melt yarn is fused and hardens when subsequently cooling down, the second layer is given the function of a soleplate. The soleplate may be adjusted to the sole of the foot and may thus e.g. evenly distribute pressure and loads over the soleplate.
Channels may be weft-knitted into the spacer weft-knitted fabric of the midsole, e.g. by omitting stitches in certain areas of the knitwear of the midsole. For example, channels might lead from the outsole through the strobel sole and laterally out of the midsole and thus achieve airing. At the same time, the outer sole may be as good as airtight and thus prevent the ingress of dirt and water.
However, the outer sole 92 and/or the midsole may also comprise a spacer weft-knitted fabric or a spacer warp-knitted fabric each, as e.g. described in the sections “knitwear” and “functional knitwear” above. In this case, the outer sole and/or the midsole and the spacer weft-knitted fabric or spacer warp-knitted fabric may comprise a different material, e.g. a different yarn. In principle, the thickness of a spacer weft-knitted fabric or a spacer warp-knitted fabric used for the outer sole 92 and/or the midsole may be adapted to the strains to be expected when the shoe 91 is worn. For example, the spacer weft-knitted fabric or the spacer warp-knitted fabric in the area of the heel could show a greater thickness than in the area of the toes, so as to specifically reduce the strength exerted on the foot when stepping on the ground, e.g. in case of a running shoe. For a heavier wearer, thicker yarns might also be used and the spacer weft-knitted fabric or spacer warp-knitted fabric could be thicker than in case of a lighter wearer.
The layers of a spacer weft-knitted fabric or a spacer warp-knitted fabric used for the shoe 91 may comprise different yarns. For example, the layer facing the foot may comprise a moisture-absorbing yarn, the layer on the side facing away from the foot may comprise rubberized yarn, and the yarn between these layers could be a strong nylon yarn (monofilament).
Spaces in the spacer weft-knitted fabric or the spacer warp-knitted fabric may be filled with damping material in order to obtain an additional cushioning. For instance, the spaces could be filled with particle foam, e.g. made from eTPU (expandable thermoplastic urethane) or ePP (expandable polypropylene), foam inserts and/or additional fibers.
These absorbent materials may be exchangeable, in order to allow the user to adapt the cushioning characteristics to his needs. For example, the knitwear of the outer sole 92 and/or the midsole (not shown in
The openings, pockets or tunnels may be accessible from the outside of the shoe. For example, the cushioning material could be inserted into an opening, a pocket or a tunnel in the outer sole and/or the midsole from the outside. Alternatively, the opening, the pocket or the tunnel is accessible from the inside of the shoe. For example, an opening, a pocket or a tunnel could be located in the outer sole and/or the midsole from the outside under the insole. In order to insert the cushioning material, the insole could then be lifted or removed first so that the opening, the pocket or the tunnel becomes accessible.
As a rule, materials may be weft-knitted or warp-knitted in specific areas of the outer sole 92 and/or the midsole. For example, a melt yarn may be weft-knitted or warp-knitted only in those areas that are most stressed by the rolling [of the foot]. In this manner, the most-strained areas are particularly reinforced.
Melt yarn may be weft-knitted into the midfoot area in the form of so-called torsion elements. After fusing and subsequently hardening the melt yarn, a once-piece function element is then created. Melt yarn may also be enmeshed only medially and then serve as a pronation aid, i.e. particularly support the foot on the medial side. A continuous layer made from melt yarn in the outer sole 92 and/or the midsole would have the effect of a continuous soleplate.
Rubberized yarn may e.g. be weft-knitted in or warp-knitted in only in areas that are in contact with the ground the most—in accordance with the rolling-over movement of the foot. A rubberized yarn may be used in the forefoot area of the sole to high up in the toe area. This provides additional stability in the toe area and prevents the upper 51 coming off from the sole due to wear and tear.
In further embodiments of the shoe 91, as shown in
The trademark 101 shown in
The upper 51 shown in
The reinforcement 102 shown in
The shoe 91 shown in
The shoe 91 shown in
In the area of the outer sole 92 and/or the midsole, the shoe 91 could also comprise a thicker, more abrasion-resistant or more water-repellent yarn than in the area of the upper 51. Thereby, the upper 51, the outer sole 92 and/or the midsole may be adapted to the respective functional requirements of the shoe.
The knitwear in the area of the upper 51 may, for example, be more permeable to water than in the area of the outer sole 92 and/or the midsole. For example, the knitwear of the upper 51 could be weft-knitted with larger stitches than the knitwear of the outer sole 92 and/or the midsole. Alternatively, the knitwear of the upper 51 may comprise openings which are already weft-knitted or warp-knitted in the knitwear during manufacture. Alternatively, the knitwear is subsequently provided with openings, e.g. by cutting out, punching out, burning out or lasering. The edges of the subsequently created openings may optionally be fused or glued together, e.g. in order to prevent fraying.
In the area of the outer sole 92 and/or the midsole, the knitwear may be arranged such that the wales of the knitwear are substantially transverse to a longitudinal axis of the outer sole 92 and/or the midsole. Thereby, the traction is increased in particular in the longitudinal direction, since the transversely arranged wales act like a transversely profiled sole. A different arrangement of the knitwear is also imaginable depending on the requirements.
The traction may also be increased by a yarn with a high static friction, e.g. a rubberized yarn, being weft-knitted into the area of outer sole 92 at certain distances. Moreover or alternatively, a yarn with high abrasion-resistance (e.g. Kevlar® or other para-aramid synthetic fiber) may be weft-knitted into the outer sole 92 at certain distances.
In the area of the outer sole 92 and/or the midsole, the knitwear may comprise weft-knitted or warp-knitted ribs and/or knobs. The warp-knitted fabric may be provided with ribs and/or knobs during the weft-knitting or warp-knitting process. Ribs and/or knobs in the area of the midsole may engage in corresponding ribs and/or knobs in the area of the outer sole 92 and so form a particularly stable joint between them. Ribs may e.g. be weft-knitted three-dimensionally, as described in the section “three-dimensional knitwear”.
The ribs may be essentially arranged transversely to a longitudinal axis of the shoe. Due to this, the traction is increased particularly in the longitudinal direction, since the transverse ribs act like a transversely profiled sole. A different arrangement of the ribs is also imaginable depending on the requirements.
The outer sole 92 and/or the midsole may be reinforced through a thermoplastic polymer material, as described in the sections “polymer coating” and “combination of monofilaments and polymer coating” above. Alternatively, the outer sole 92 and/or the midsole may also be reinforced by monofilament, as described in the sections “monofilaments for reinforcement” and “combination of monofilaments and polymer coating” above.
The knitwear may comprise a thermoplastic yarn in the area of the outer sole 92 and/or the midsole. A thermoplastic yarn may be weft-knitted or warp-knitted in the knitwear during manufacture of same. If the shoe is subsequently heated to above the melting point of the thermoplastic yarn, the latter melts and solidifies during the subsequent cooling. Thereby, the knitwear is reinforced and gains stability.
The thermoplastic yarn may be weft-knitted or warp-knitted in along the entire surface of the outer sole 92 and/or the midsole. In this case, only certain areas may be heated up and fused as required, e.g. in a customer-specific manner. Alternatively, the thermoplastic is only at hand in certain areas of the outer sole 92 and/or the midsole. In this case, the distribution of the thermoplastic yarn may also be made as required, e.g. in a customer-specific manner.
The knitwear of the outer sole 92 and/or the midsole may be immersed in a rubber, latex, starch or polymer bath so that the yarns and/or the spaces fill with rubber, latex, starch or polymer in order to increase the friction and the traction (in case of a rubber or latex bath) and the rigidity (in case of a starch or polymer bath).
In these embodiments, as shown in
The midsole 121 comprises a spacer weft-knitted fabric, as e.g. described in the sections “knitwear” and “functional knitwear”. Alternatively, the midsole is entirely formed from a spacer weft-knitted fabric. The spacer weft-knitted fabric of the midsole 121 may comprise a monofilament as a spacer yarn for example. In the area 122, which is located in the midfoot area, the spacer weft-knitted fabric is weft-knitted more tightly than in other areas. In this manner, additional stability is created in the midfoot area and the midfoot is supported. The spacer weft-knitted fabric may also be weft-knitted more tightly in other areas of the foot, e.g. in accordance with the requirements of a wearer of the shoe 91. The spacer weft-knitted fabric may additionally or alternatively also be weft-knitted thicker in certain areas. For example, the spacer weft-knitted fabric could be weft-knitted thicker in the area of the arch of the foot in order to support the arch of the foot.
The top layer 123 of a spacer weft-knitted fabric of the midsole 121 fulfills the function of an outsole, a strobel sole or a flat sole. The outsole directly touches the foot. The upper layer 123 of the spacer weft-knitted fabric of the midsole 121 may comprise a humidity-absorbing yarn.
An area 124 comprising melt yarn may optionally be weft-knitted into the spacer weft-knitted fabric of the midsole 121. For example, a melt yarn may be weft-knitted into the inner layer of the spacer weft-knitted fabric or the outer layer of the spacer weft-knitted fabric. The melt yarn fuses subject to heat and hardens as it cools down. In this manner, a harder area 124 is created, which may e.g. support torsion of the midsole and simultaneously support the midfoot.
Ventilation channels, that is, notches, (not shown in
The outer sole 92, which is shown in the side view of
In further embodiments, as shown in
A midsole in the form of an insert 131 is placed inside the shoe 91. The insert 131 may be tightly connected to the upper 51 and/or the outer sole 92, e.g. sewn, glued or welded (by ultrasound, as described in the section “functional knitwear” above, by high-frequency welding or laser) to the outer sole 92. Alternatively, the insert 131 may be removable from the shoe. It is also conceivable that the knitwear of the outer sole 92 comprises a weft-knitted or a warp-knitted pocket on the top (not shown in the Figures), into which the insert, e.g. a midsole comprising knitwear, may be inserted.
The insert 131 may comprise knitwear so that it is a midsole comprising knitwear. Alternatively, the midsole may comprise no knitwear and be manufactured from foam material or ethylene vinyl acetate (EVA), for example. The insert 131 may be entirely surrounded by weft-knitted or warp-knitted material of the upper 51 and/or the outer sole 92, e.g. in the form of the above-described pocket, in order to reduce or prevent shifting.
The knitwear of the outer sole 92 may comprise a more durable yarn, e.g. a Kevlar® yarn or other para-aramid synthetic fiber. Alternatively or additionally, the outer sole 92 may be coated with a durable coating, e.g. Kevlar® or other para-aramid synthetic fiber.
In further embodiments, as shown in
The knitwear of the outer sole 92 may comprise rubberized yarn in the area of the knobs in order to increase traction. The rubberized yarn may be weft-knitted into the knitwear for example in the type of binding or “floating”. In this regard, the rubberized yarn may be weft-knitted in with a herringbone pattern. Due to this, the rubberized yarn may move freely to a certain extent and adjust the floor in order to achieve better traction.
In various embodiments (not shown in
The arrangement of the structures with the second yarn may correspond to a human footprint, as is shown in the embodiments of
In the embodiments of
The upper 51 may also comprise knitwear in the embodiments of
In the embodiments of
If the outer sole 92 is manufactured as one-piece knitwear with the upper 51, the knitwear may be manufactured on a circular weft-knitting machine or a circular warp-knitting machine. Alternatively, the one-piece knitwear may be manufactured on a flat-knitting machine. In this case, a seam could be provided for along the sole, in a manner similar to a moccasin construction, in order to obtain the desired shape of the shoe.
In all embodiments of the invention, the outer sole 92 and/or the midsole 121 may comprise at least one pocket (not shown in the Figures) into which a material insert may be inserted. The pocket may be manufactured with the knitwear of the outer sole 92 and/or the midsole 121 as one piece during weft-knitting or warp-knitting. The material insert may e.g. be a foam insert, an air cushion or a gel insert, which provides cushioning, for example. The pocket may fully or partially surround the material insert.
In the following, further examples are described to facilitate the understanding of the invention:
Different arrangements of the components depicted in the drawings or described above, as well as components and steps not shown or described are possible. Similarly, some features and sub-combinations are useful and may be employed without reference to other features and sub-combinations. Embodiments of the invention have been described for illustrative and not restrictive purposes, and alternative embodiments will become apparent to readers of this patent. Accordingly, the present invention is not limited to the embodiments described above or depicted in the drawings, and various embodiments and modifications may be made without departing from the scope of the claims below.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2013 207 156 | Apr 2013 | DE | national |
This application is a continuation patent application of U.S. application Ser. No. 14/257,737, filed Apr. 21, 2014, entitled SHOE (“the '737 application”), which is related to and claims priority benefits from German Patent Application No. DE 10 2013 207 156.6, filed on Apr. 19, 2013, entitled SHOE, IN PARTICULAR A SPORTS SHOE (“the '156 application”). The '737 and '156 applications are hereby incorporated herein in their entireties by this reference.
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| IPR2016-00921 , Decision on Institution of Inter Partes Review, Oct. 21, 2016, 24 pages. |
| IPR2016-00921 , Final Written Decision, Oct. 19, 2017, 49 pages. |
| IPR2016-00921 , Order Modifying Institution Decision and Granting Request for Additional Briefing, Aug. 24, 2018, 14 pages. |
| IPR2016-00921 , Patent Owner s Objection to Admissability of Evidence, Apr. 28, 2017, 4 pages. |
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| IPR2016-00922 , Decision on Institution of Inter Partes Review, Oct. 21, 2016, 24 pages. |
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| IPR2017-00263 , Decision Denying Request for Rehearing , Jul. 20, 2017, 12 pages. |
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| Number | Date | Country | |
|---|---|---|---|
| 20170156434 A1 | Jun 2017 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 14257737 | Apr 2014 | US |
| Child | 15440883 | US |
