Patent Application
20210189609
The present invention relates to fabrics, yarns and processes for making composite yarns. In particular, the present invention relates to composite spun yarns having a core surrounded by a fiber bundle embedded with one or more filaments, and a process of forming such composite spun yarns displaying desirable performance characteristics, such as enhanced strength and cut-resistance.
High performance yarns and fabrics with enhanced physical properties, such as cut-resistance, increased strength, and thermal/fire-resistance properties, may be formed by combining various fibers and filaments that incorporate such properties. For example, such high performance yarns generally include cores, formed from one or more filaments or fibers such as glass, metals, or synthetic or polymeric materials such as aramid or para-aramids. The cores are often wrapped with one or more additional filaments or fibers, generally including various natural and synthetic or polymeric materials. Unfortunately, a common draw-back of many conventional high performance yarns is a failure to exhibit an optimum combination of economy and performance, i.e. such yarns can often require greater expense in the manufacture thereof due to the nature of the materials used in conventional high performance yarns and the performance characteristics expected therefrom. In addition, there is need to try to minimize direct skin contact between a wearer of a garment made from such composite yarns and potentially abrasive core filaments (i.e. aramid, para-aramid, glass or steel fibers/filaments) of the composite yarns. Consequently, there is a continuing need for alternative high performance yarns and fabrics that addresses the foregoing and other related and unrelated problems in the art.
Briefly described, the present disclosure is, in one aspect, directed to methods and systems for forming composite spun yarns with desired performance characteristics. In an embodiment, a method for making a composite yarn may be provided. The method of forming a composite yarn includes spinning at least one core filament (i.e. a glass, a metal, or a synthetic/polymeric filament having cut-resistant and/or heat resistance properties) with one or more rovings of staple fibers, which can be of the same or a similar type so as to form a substantially blended fiber bundle that will be spun about the core filament. For example, the fibers of the fiber bundle can be natural or synthetic/polymeric fibers such as cotton, nylon, etc. . . . having additional selected properties such as moisture wicking, softness, etc. . . . to be incorporated with the properties of the core filament. As the core filament and fibers from the roving(s) are spun together, an additional or first filament further is introduced to the spinning frame.
The additional or first filament is applied at approximately the same turns per inch as the roving fibers are spun or twisted about the core filament so as to be integrated with the fiber bundle. The integrated additional filament/fiber bundle mass is spun/twisted around the core filament, which is substantially centered and enclosed within the integrated filament/fiber bundle, forming an initial or base yarn that is spun in a first direction so as to have an initial “S” or “Z” direction of twist. During this operation, the core filament is covered by and encased within the integrated filament/fiber bundle that a sheath or wrapping around the core filament to an extent that the core filament substantially bound and locked within the integrated filament/fibrous bundle or sheath. As a result of this twisting/wrapping of integrated filament/fibrous bundle locking the core filament there-within, the core filament is protected from being exposed or pulled out of the resultant composite yarn during subsequent knitting, weaving or other operations to form a fabric therefrom.
The method can further include plying the base yarn with a further or second filament or yarn component/bundle, which can be applied at an angle of about 10°-45°, during an additional spinning or twisting operation. Such additional filament or yarn generally will be selected based on additional technical properties or characteristics, in addition to the cut resistance and other properties of the base yarn, that are desired to be incorporated within the resultant composite high performance yarn and fabrics woven, knitted or otherwise formed therefrom. During this additional spinning/twisting operation, the base yarn and the second or further filament or yarn plied therewith are spun in an opposite direction to apply an opposing twist (e.g. an opposite Z or S twist) and to an extent (e.g. at a number of twists per inch or rate/amount of twist selected/designed to substantially minimize the torque of the finished composite yarn.
In addition, or alternatively, the second filament or yarn component could be added to the initial spinning operation, i.e. with the first filament, such that the second filament also can be intermingled with both the first filament and the fibers of the roving(s) as they are wrapped and twisted about the core filament in the first direction. As a result, the first and second filaments can be substantially integrated within the fiber bundle defining the wrapping or covering enclosing the core filament and with the additional filament twisted thereabout to form a base yarn having an initial “S” or “Z” direction of twist with its core filament substantially locked and bound within a sheath or covering fibers/filaments. Thereafter, the method further can include plying one or more additional filaments (e.g. a third filament) with the base yarn at an angle, and spinning the base yarn and third filament together in a second direction opposite the first direction sufficient to substantially minimize the torque of the finished composite yarn while providing further selected or desired performance characteristics/properties to the yarn.
In another embodiment, a composite high performance yarn having enhanced cut resistance and/or other selected technical or performance properties is disclosed. The composite yarn generally will include a first yarn component that can include a blended fiber bundle applied as a wrapping or covering spun about a central core that may be formed by one or more substantially continuous filaments or fibers selected from materials having a selected or pre-determined high hardness of, for example, approximately 7.0 or greater on the Mohs hardness scale. The fiber bundle can include fibers of natural and/or synthetic materials (for example, cotton, wool, nylon, etc. . . . ), generally selected to provide protection from contact between the core filament(s) and a person's skin, as well as providing other desired characteristics such as softness, moisture wicking, and/or other properties. The high hardness core filament typically can be formed from metals such as tungsten or alloys thereof, or other, similar high hardness metal or synthetic materials, for forming a first or base yarn component with a hardness of at least approximately 7.0 or greater on the Mohs hardness scale.
A high hardness core first yarn component thus will be formed with enhanced cut resistance and with additional selected or desired properties based on the fibers spun or wrapped thereabout and forming the sheath or covering. In addition, as the high hardness core filament is spun and wrapped with the sheath of fibers, e.g. staple or natural such as cotton, wool, etc. . . . , or synthetic fibers including aramids, para-aramids, nylon, etc. . . . , one or more additional filament(s) or yarn(s) can be added during the spinning process so as to be integrated and twisted with the high hardness core first yarn component. In various embodiments, the additional filament(s) or yarn(s) generally can include materials such as polyester, nylons, lycra, para-aramids, high density polyethylene, low linear polyethylene, high density polypropylene, PTT, and combinations or blends thereof, which can be selected to help bind or lock the high hardness core within the fibrous bundle, while also providing additional performance characteristics and/or protection to the high hardness core.
The additional filament(s) also will be spun/twisted with and is integrated into the fibrous bundle, which integrated filament/fibrous bundle is wrapped and/or twisted about the core filament, defining a close wrapped sheath or covering with an additional, integrated wound filament twisted about the core filament. The wrapping fibers, the core filament(s), and the first filament (and any additional independent filament in some embodiments) further will be spun together to form an initial or base yarn that generally will have a twist oriented in a first direction (e.g. an “S” or “Z” direction), and with the integrated filament/fiber bundle being twisted and/or spun about the core filament at a number of turns per inch sufficient to substantially bind the filament and fibers of the bundle together and lock about the core filament(s) within the integrated filament/fiber bundle. As a result, the first yarn component core filament is formed with its substantially encapsulated within the integrated filament/fiber bundle sufficient to bind and protect the core from becoming pulled or otherwise exposed during later finishing, knitting, weaving or other operations to which the composite yarn is subjected to form high performance or technical fabrics.
The composite yarn further can include one or more further (e.g. second or third) filament(s) or a second yarn component that will be plied with the base or first yarn component and spun therewith in a subsequent spinning operation. For example, the high hardness core spun first yarn component can be plied and spun with a second yarn component comprising a glass core yarn having a core of a glass or fiberglass material encapsulated within a sheath of fibers. The plied second yarn component generally will be selected to provide additional desired properties or performance characteristics, e.g., additional cut or abrasion resistance from the glass core, and other properties such as softness, moisture wicking, etc. . . . , that can be provided by the sheath fibers.
The second yarn component further generally will be wrapped or twisted about the first or base yarn component, for example, being applied and/or twisted at an angle of about 10°-45° (though other angles also can be used). During such spinning, the first or base and the second yarn components further generally will be spun or twisted in a second direction that is opposite the first direction to create/apply an opposite direction twist sufficient to substantially minimize the torque created in the base yarn during the initial spinning operation. The resultant composite high performance yarn can thus have a substantially reduced or minimized level of torque while also incorporating the performance characteristics or properties of the second yarn component with the high hardness and cut resistance and other properties of the first yarn component.
In one aspect, a method of making the composite yarn can include spinning at least one core filament with a series of staple fibers, and introducing a first filament during spinning of the series of staple fibers about the at least one core filament. The series of staple fibers and the first filament will be combined to form a fibrous bundle, the fibrous bundle wrapped about the at least one core filament to form a base yarn that is spun in a first twist direction. The first filament is also generally applied at approximately the same turns per inch as the series of staple fibers. The method also includes plying at least one additional filament or an additional yarn bundle to the base yarn to form a base yarn bundle, and twisting the at least one additional filament in a second twist direction opposite the first twist direction.
The composite yarn can comprise a base yarn having a core filament having a fibrous bundle spun or twisted thereabout, wherein the fibrous bundle includes a first filament introduced during spinning of a series of sheath fibers about the core filament such that the first filament and the sheath fibers form an integrated filament and fibrous bundle that is twisted about the core filament sufficient to substantially lock and bind the core filament within the integrated filament and fibrous bundle and with the first filament being twisted with the sheath fibers about the core filament at approximately the same turns per inch as the sheath fibers to produce the base yarn with a first twist direction. At least one additional filament or an additional or second yarn is piled and spun with the base yarn, wherein the at least one additional filament or yarn is spun with the base yarn in a second twist direction opposite the first twist direction sufficient to substantially minimize torque in the composite yarn.
In another aspect, a method of making the composite yarn can comprise spinning a first core filament with a series of fibers and at least one additional filament introduced during spinning so as to form an integrated filament/fiber sheath about the first core filament to form a first yarn component, wherein the first core filament comprises a material having a hardness of at least approximately 7.0 or greater on the Mohs hardness scale and is substantially bound and locked within the filament/fiber sheath. The method also includes plying the first yarn component with a second yarn component having at least one second core filament including a glass component and spinning the first yarn component with the second yarn component to form a composite yarn with the first yarn component forming a core of the composite yarn having a hardness of at least approximately 7.0 or greater on the Mohs hardness scale and wrapped with the second yarn component.
In another aspect, the composite yarn can comprise a first yarn component a formed of a material having a hardness of at least approximately 7.0 on the Mohs hardness scale, a first sheath of fibers spun about the at least one first core filament and an additional filament introduced during spinning of the first sheath of fibers about the core so as to be twisted about the core sufficient to substantially lock the core within the first sheath of fibers. A second yarn component comprising a glass core and a second sheath of fibers can be applied about the glass core wherein the first yarn component is ring spun with the second yarn component to form the composite yarn having the first yarn component as the core of the composite yarn with the second yarn component twisted thereabout.
Various objects, features and advantages of the present invention will become apparent to those skilled in the art upon a review of the following detail description, when taken in conjunction with the accompanying drawings.
It will be appreciated that for simplicity and clarity of illustration, elements illustrated in the Figures are not necessarily drawn to scale. For example, the dimensions of some elements may be exaggerated relative to other elements. Embodiments incorporating teachings of the present disclosure are shown and described with respect to the drawings herein, in which:
The use of the same reference symbols in different drawings indicates similar or identical items.
The following description in combination with the Figures is provided to assist in understanding the teachings disclosed herein. The description is focused on specific implementations and embodiments of the teachings, and is provided to assist in describing the teachings. This focus should not be interpreted as a limitation on the scope or applicability of the teachings.
In general, the present invention is directed to systems and methods for formation of high performance composite spun yarns. These composite yarns generally exhibit properties such as enhanced cut-resistance and strength. Some of the embodiments of the present disclosure contain processes that help impart useful performance properties to the finished composite yarns. These performance properties may then be imparted to fabrics made of such composite yarns and the garments formed therefrom. In general, the yarns of the present invention are designed to be produced using a ring or other type of spinning frame and spinning process.
The finished composite yarns formed by these processes further generally are designed to endure the mechanical and physical abuses of knitting or weaving machinery without sustaining physical damage causing the core filament to protrude or otherwise become exposed (i.e. with the potential for their core filaments being pulled out or bubbling through the sheath or covering being substantially minimized) during knitting or weaving of the yarns into fabrics, as well as during other operations such as needle punching, tufting, etc. . . . for forming various woven and/or non-woven performance fabrics. The resultant high performance fabrics formed from the composite yarns typically have enhanced performance properties, such as increased strength, abrasion or cut-resistance, and/or fire/heat resistance. Such fabrics can be used in forming protective garments such as protective gloves, outer wear such as firefighters' coats, or a variety of other type of garments and articles for which properties such as a high cut resistance, impact resistance, enhanced strength, enhanced fire or heat resistance, are necessary or desired, but also have further desired properties such as softness or feel to enable enhanced mobility and/or flexibility of the fabrics with the wearer being protected from contact with potentially abrasive cut or fire/heat resistant materials within the yarns. The high performance composite yarns of the present disclosure also can be used in industrial webbing, belting and other applications.
In an embodiment, the at least one core filament 102 may include any suitable inorganic or organic glass or fiberglass material. In addition or alternatively, the at least one core filament 102 may be formed from any suitable metal, such as, for example, steel, stainless steel, aluminum, copper, bronze, alloys thereof and the like as well as, synthetic or natural filaments materials selected from acrylics, modacrylics, polyesters, high density polyethylenes, such as SPECTRA®, Dyneema® and Tsunooga®, polyamides, linear low density polyethylenes, polyethylenes, liquid crystal polyesters, liquid crystal polymers such as Vectran™, polypropylenes, nylons, cellulosics, PBI, graphites, and other carbon-based fibers, co-polymers and blends thereof.
In some embodiments, glass filaments can be used for or as a part of the at least one core filament 102 and can vary in thickness from, for example, between about 50 denier to about 1200 denier and can be twisted or untwisted. In other embodiments, various metal (e.g. steel, aluminum, etc. . . . ), natural and/or synthetic filaments used for as or part of the at least one core filament 102 likewise generally can vary in thickness from between, for example, about 25 microns to about 400 microns, twisted or untwisted. Greater or lesser filament sizes or thicknesses also can be used for the glass, metal, natural and synthetic filaments as desired or needed, depending upon the application for the composite yarn 122.
Referring again to
As the at least one core filament 102 and the staple fibers 106 from the roving are spun together, an additional or first filament 104 further is introduced into the initial spinning operation 120. In an embodiment, the first filament 104 can comprise a material substantially similar to a material of the at least one core filament 102. In other embodiments, the first filament 104 can comprise a material substantially different to the material of the at least one core filament 102. For example, suitable materials for the first filament 104 can include polyester, nylon, PTT, lycra, para-aramids, high density polyethylene, and blends thereof.
The first filament 104 is introduced to the initial spinning operation 120 with the fibers 106, generally being fed into the area where the fibers 106 are spun about the at least one core filament such that the first filament 104 is combined and/or intermingled with the fibers 106 of the fiber bundle 105 being spun or twisted about the core filament to form an integrated fibrous bundle 107. In an embodiment, the first filament 104 can be introduced to the fiber bundle 105, for example, from the side as indicated in the Figures, before or as the fiber bundle is being formed or as it exits the initial spinning operation 120.
Introducing the first filament 104 in this manner causes the first filament 104 to integrate with the fibers 106 to form the integrated fibrous bundle 107 that surrounds the at least one core filament 102, with the first filament 104 and fibers 106 twisted thereabout to an extent to lock the at least one core filament substantially within a middle or center of the integrated fibrous bundle. The first filament becomes embedded as an integral component in the resulting base yarn 112, and further generally is applied at approximately the same turns per inch as that of the fibers 106 so that the filament/fibrous bundle 107 substantially encapsulates and binds integrated the core filament 102 within the center of the yarn, rather than being loosely covered or wrapped as provided by a typical covering process, which binding/locking of the core filament within its protective fibrous bundle helps minimize the core filament from being exposed/pulled out when the composite yarn 122 is subjected to mechanical stress during knitting, weaving, etc. to form fabric.
The integrated filament/fibrous bundle thus is wrapped around and binding the at least one core filament 102 forms a base yarn 112 that is spun with a twist in a first direction. In an embodiment, the first direction of twist can be a S-direction or counter-clockwise direction of twist. In another embodiment, the first direction of twist is a Z-direction or clock-wise direction of twist. The twisting or spinning of integrated filament/fibrous bundle about the core filament is done to an extent sufficient to lock the at least one filament 102 within the wrapping/sheath defined by the integrated filament/fibrous bundle, so as to ensure that the at least one core filament 102 is protected from abrasion or cutting; and also protects and or retards against the at least one core filament from projecting or protruding from the integrated fibrous bundle forming a wrapping or covering sheath thereabout (i.e. containing the core filament within the composite yarn even if it becomes broken or splintered such as when exposed to mechanical stresses during knitting, weaving or other operations) to protect a wearer from inadvertent engagement therewith.
Referring again to
As indicated in
Alternatively, as indicated in Fig.1B, the addition of the further or second filament or yarn 108 can be carried out in a subsequent or separate spinning process 130. For example, the base yarn 112 can be formed and collected on a roving 132 or spindle, and thereafter can be transferred to a separate or downstream spinning frame 130 for spinning or twisting the additional filament or yarn 108 thereabout.
In an embodiment, a mass ratio of the at least one core filament 102 in the resultant composite yarn 122 formed from the base yarn bundle 112 can be between about 10% and about 60%. In another embodiment, a mass ratio of the at least one additional filament 104 in the resultant composite yarn 122 formed from the base yarn bundle 112 can be between about 3% and about 35%. These mass ratio ranges are example ranges, and different mass ratio ranges may be considered to meet certain desired characteristics of the resultant composite yarn.
In an additional embodiment illustrated in
Thereafter, one or more additional filaments (e.g. a third filament 204) may be plied with the base yarn 112, for example being introduced at an angle of between about 10° and about 45°, and spun together with the base yarn 112 in a second direction opposite the first direction with/at a number of twists per inch sufficient to provide additional properties or performance characteristics to substantially neutralize and/or minimize the torque of the finished composite yarn 222.
In other embodiments, the composite high performance yarn (shown at 122 in
In some embodiments, an additional or second filament or filaments also can be introduced into and embedded within the base yarn 112. The wrapping staple fibers 106, the core filament(s) 102, and the first filament 104 (and any additional independent filament in some embodiments) will be spun together to form the initial or base yarn that generally will have a twist oriented in a first direction (e.g. an “S” or “Z” direction) as indicated by arrows 310 of
In addition, a fabric can be made from the composite yarns 122 and 222 of
In a further embodiment,
A first sheath of staple fibers 24 will be applied to the at least one first core filament 12 during a ring jet spinning process. The resulting first component 10 will generally comprise the high hardness core filament 12 having a hardness of at least about 7.0 Mohs and having a sheath of fibers 24 that can be selected from various staple or natural fibers, synthetics or other fibers, wrapped or twisted thereabout.
This first component or yarn 10 further can be plied/twisted and spun with a second component 110. The second component 110, can comprise a filament or a yarn having a core filament 112 formed from a cut resistant material. For example, the second component can comprise a composite yarn having a glass filament core ranging in thickness from about 20 denier to about 3,000 denier, encased within a sheath of fibers 124 that can include similar fibers to those applied to the high hardness core first yarn component 10, and which can be selected to provide additional characteristics or properties such as softness/feel, moisture wicking, static dissipation, etc. Alternatively, the second component can comprise a filament, or a yarn formed from a spun sheath of fibers without a core, and one or more additional synthetic or natural filaments or fibers can be used, including fibers formed from materials selected from aramids, acrylics, BaSofil®, modacrylics, polyesters, high density polyethylenes (HPPE), such as SPECTRA®, Dyneema® and Tsunooga®, polyamides, liquid crystal polyester, liquid crystal polymers such as Vectran™, linear low density polyethylenes, polypropylenes, nylon, cellulosics, PBI, graphites, and other carbon-based fibers, co-polymers and blends thereof.
As also indicated, during the ring spinning process, the fibers of the first sheath of fibers 24 and the second sheaths of fibers 124 can be substantially intermeshed or entwined to help lock the fibers. As a result, the first component or yarn 10 and the second component 110 can be twisted and spun together with the high hardness core 12 of the resultant high performance composite yarn bound by the glass filament core 112 of the second yarn component 110, with the high hardness core 12 of the composite yarn 126 being substantially encapsulated or encased within a protective covering. This binding and/or locking of the high hardness core 12 within the integrated glass core yarn/fibrous bundle protects the high hardness core filaments 12 and/or fibers while adding further selected or desired performance properties or characteristics to the composite yarn. Thereafter, as the composite yarn is subjected to mechanical stresses during weaving, knitting, needling or other operations to form a performance fabric therefrom, the high hardness core can be protected from becoming engaged and pulled or exposed.
In certain circumstances, it is desirable to form a high performance yarn embodying the principles of the present disclosure with the second yarn component 110 not containing glass filament. In an embodiment, the second yarn component 110 may include one or more metal filaments and one or more nonmetallic filaments. The nonmetallic filaments or fibers can be roughened, textured and/or stretch-broken. Such nonmetallic filaments included in the core of this embodiment may be formed from materials selected from aramids, acrylics, melamine resins Such as Basofil®, modacrylics, polyesters, polypropylenes, high density polyethylenes such as SPECTRA®, Dyneema® and Tsunooga®, polyamides, liquid crystal polyesters, liquid crystal polymer such as Vectran™, nylon, rayon, Silica, cellulosics, PBI, conductive fibers, graphites and other carbon-based fibers, co-polymers and blends thereof. These nonmetallic filaments may be stretch-broken and/or roughened for other types of care and/or sheath fibers. The sheath of staple fibers 124 thereafter applied to the core of this embodiment generally will be formed of the same materials and be processed according to the same methods described herein for other sheaths.
Test Results:
An abrasion/cut resistant fabric formed using the composite yarns formed according to the principles and methods of the present disclosure, formed from a series of short staple fibers wrapped and spun about a glass filament core and including a filament of high density polyethylene wrapped about and integrated with the staple fibers spun about the core (referred to as “Sample A” below), were tested against abrasion/cut resistant fabrics formed using an existing abrasion resistant yarns having short staple fibers spun about a glass core (referred to as “Sample B” below). For the testing, the sample fabrics used included:
In a first series of tests, the fabrics of Sample A and Sample B were subjected to Abrasion Resistance Testing of Textile Fabrics according to ASTM D3884: wherein multiple samples of each fabric were tested, with each sample mounted on a rotary turntable of a Tabor Abrasion Wheel Testing device (Type H-18) with a 500-gram weight applied thereto, and subjected to wearing action applied by a pair of abrasive wheels applied at consistent pressures. The results of the testing were as follows:
In a second series of tests, fabrics of Sample A and Sample B also were subjected to Cut Resistance Testing in accordance with ASTM F2992/F2992M-15 Standard Testing for Measuring Cut Resistance of Materials Used in Protective Clothing. In such testing, the fabrics of samples A and B were place in a holder and subjected to cutting via a razor blade drawn along/across each sample. The tests were repeated with a differing weight/load applied to the razor blade for each test run. The results of the testing were as follows:
Although only a few exemplary embodiments have been described in detail herein, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of the embodiments of the present disclosure. Accordingly, all such modifications are intended to be included within the scope of the embodiments of the present disclosure as defined in the following claims. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures.
