Patent Grant
9504296
The present invention relates to touch fastening products, and more particularly to touch fastening products configured to be incorporated into molded articles.
Traditionally, hook-and-loop fasteners comprise two mating components that releasably engage with one another, thus allowing coupling and decoupling of the two surfaces or objects. The male fastener portion typically includes a substrate having fastener elements, such as hooks, extending from the substrate. Such fastener elements are referred to as “loop-engageable” in that they are configured to releasably engage with fibers of the mating component to form the hook- and loop-fastening.
Among other things, hook-and-loop fasteners are employed to attach upholstery to car seat cushions. Car seat cushions are typically made of a foam material. To attach the upholstery to the foam, one fastener product is incorporated at a surface of the foam car seat and the mating component is incorporated into the upholstery, or is provided by the upholstery itself. The male fastener elements releasably engage with the mating component to couple the upholstery to the foam car seat.
To incorporate a male fastener product into a foam cushion, the fastener product may be positioned within a cushion mold, such that as foam fills the mold to form the cushion, the foam adheres to the fastener product. Flooding of the fastener elements by the foam during forming of the cushion is generally seen as inhibiting the usefulness of the fastener elements, and so several improvements have been made to attempt to avoid such foam intrusion.
Further advances in the design of fastener products are sought, for this and for other applications.
One aspect of the invention features a male touch fastener strip including an elongated base having a thickness and defining a longitudinal direction and a lateral direction perpendicular to the longitudinal direction across the base between longitudinal edges of the base, and a field of male fastener elements each having a stem extending from a broad face of the base and a head at an upper end of the stem and overhanging the base for engaging fibers. The fastener element stems and broad face of the base together form a unitary mass of resin. A pair of longitudinal barrier walls rises from the broad face of the base on either side of the field of male fastener elements. The male touch fastener strip also includes a plurality of lateral barrier walls. Each of the lateral barrier walls extends between facing surfaces of the longitudinal barrier walls to define a longitudinal column of bounded fastening cells that each contain one or more of the male fastener elements. Each lateral barrier wall defines at least one gap extending therethrough and connecting adjacent fastening cells.
In some examples, each lateral barrier wall defines multiple gaps extending therethrough. In some applications, the longitudinal column of bounded fastening cells includes a series of at least four bounded fastening cells.
In some cases, the gaps defined by the lateral barrier walls extend from the broad face of the base. In some cases, the gaps defined by the lateral barrier walls extend through an upper extent of the lateral barrier walls.
In some implementations, the gaps defined by the lateral barrier walls each define a lateral gap width. The lateral gap width is preferably between about 0.002 and 0.015 inch, more preferably between about 0.004 and 0.012 inch.
In some examples, the gaps defined by the lateral barrier walls each have a width that is constant over different distances from the broad face of the base. In some examples, the gaps defined by the lateral barrier walls each have a width that varies with distance from the broad face of the base. In some cases, the gaps defined by the lateral barrier walls are wider at their distal extent than at a height closer to the broad face of the base.
In some embodiments, the lateral barrier walls each have a height at least as great as that of the male fastener elements. In some embodiments, the lateral barrier walls are spaced apart from one another by between 0.3 and 0.5 inch in the longitudinal direction.
Some examples of the male touch fastener strip feature foam disrupters rising from the broad surface of the base within the fastening cells adjacent the gaps. In some embodiments, the foam disrupters are of a height less than a height of the lateral barrier walls, while in some other cases they extend to the same height as the lateral barrier walls. In some embodiments, the foam disrupters extend, in a side profile, to distal points that define a point radius. In some cases, the point radius is less than 0.0015 inch.
In some implementations, the broad face of the base defines a longitudinal groove connecting and forming a lower extent of the gaps defined by the lateral barrier walls.
In some examples, the longitudinal barrier walls are lengthwise continuous. In some examples, the longitudinal walls each include a longitudinal column of spaced-apart wall segments defining longitudinal gaps therebetween. The longitudinal gaps may have a maximum width along the longitudinal direction of the base. In some cases, the maximum width of the longitudinal gaps is at least about 0.02 inch.
In some embodiments, the male touch fastener strip includes a chain of fastening segments, each segment including respective longitudinal portions of the base, the field of male fastener elements, the longitudinal barrier walls and at least two lateral barrier walls. Each segment is connected to at least one adjacent segment of the chain by a flexible neck of less width than the segment.
Some examples of the male touch fastener strip have a pair of segmented walls rising from the broad face of the base. Each segmented wall of the pair is disposed laterally outboard of a respective nearest one of the longitudinal barrier walls. Each segmented wall includes a series of wall segments defining longitudinal gaps therebetween. In some cases, each segmented wall and its nearest longitudinal barrier wall define therebetween a foam relief space for receiving a foam material, each respective foam relief space having a volume per unit strip length. In some cases, each segmented wall defines a longitudinal flow gap for allowing the foam material to enter the foam relief space, each respective flow gap having an area per unit strip length. In some examples, the ratio of foam relief space volume per unit strip length and flow gap area per unit strip length is between about 0.02 and 0.80 inch. By “volume per unit strip length” we mean the product of the distance between facing surfaces of a respective segmented wall and its nearest barrier wall and the height of the barrier wall. Each segmented wall defines a flow gap for allowing the foam material to enter the foam relief space, each respective flow gap having an area per unit strip length. By “flow gap” we mean the total exposed area of all flow enabled openings through and around a segmented wall.
Another aspect of the invention features a male touch fastener strip including an elongated base having a thickness and defining a longitudinal direction and a lateral direction perpendicular to the longitudinal direction across the base between longitudinal edges of the base, and a field of male fastener elements each having a stem extending from a broad face of the base and a head at an upper end of the stem and overhanging the base for engaging fibers. The fastener element stems and broad face of the base together form a unitary mass of resin. The male touch fastener strip also includes a pair of longitudinal barrier walls rising from the broad face of the base on either side of the field of male fastener elements. The broad face of the base defines a longitudinal groove disposed between the longitudinal barrier walls and between adjacent longitudinal columns of the male fastener elements, the base having a thickness in the groove of less than about 70 percent of a nominal thickness of the base on either side of the groove.
In some examples, the male touch fastener strip includes a plurality of lateral barrier walls, each of the lateral barrier walls extending between facing surfaces of the longitudinal barrier walls to define a longitudinal column of bounded fastening cells that each contain one or more of the male fastener elements. In some cases, each lateral barrier wall defines at least one gap aligned with the groove and connecting adjacent fastening cells.
Yet another aspect of the invention features a male touch fastener strip including an elongated base having a thickness and defining a longitudinal direction and a lateral direction perpendicular to the longitudinal direction across the base between longitudinal edges of the base, and a field of male fastener elements each having a stem extending from a broad face of the base and a head at an upper end of the stem and overhanging the base for engaging fibers. The fastener element stems and broad face of the base together form a unitary mass of resin. A pair of longitudinal barrier walls rises from the broad face of the base on either side of the field of male fastener elements. The male touch fastener strip also includes a pair of segmented lateral barrier walls extending between facing surfaces of the longitudinal barrier walls to separate two adjacent fastening cells that each contain one or more of the male fastener elements. Each segmented lateral barrier wall includes multiple segments separated by gaps. The segments of one of the lateral barrier walls are laterally offset from the segments of the other of the lateral barrier walls, such that the pair of lateral barrier walls together defines effective gaps connecting the adjacent fastening cells.
In some implementations, the effective gaps are narrower than the gaps separating the segments of each lateral barrier wall. In some examples, the segments of each lateral barrier wall are spaced from all segments of the other lateral barrier wall. In some examples, the longitudinal barrier walls and the segments of the lateral barrier walls extend to a similar height from the base. In some cases, the effective gaps between the adjacent segments of the lateral barrier walls have an effective gap width greater than zero and less than about 0.003 inch, more preferably less than about 0.0015 inch.
Many of the features of the examples described herein can help to promote secure attachment of the fastener strip within a foam body, such as a seat cushion. Providing a fastening product with gaps extending through lateral walls separating fastening cells can permit air to flow between the cells during the mold-in process, and can in some cases help to avoid undesirable lifting of the fastening product from the mold surface due to air expansion, and may equalize pressure between cells, helping to avoid ‘burping’ or rapid release of air from under the fastening product. Such gaps can also increase the flexibility of the fastening product, permitting the fastening product to more readily bend about an axis running along its length, or to otherwise conform to curved mold surfaces without buckling. Additionally, the foam may flow into fastener cells adjacent ends of the product through the gaps, which may further help to anchor the ends of the fastening product in the molded foam article.
The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims.
Like reference symbols in the various drawings indicate like elements.
Referring to
In this example, barrier walls 104 are continuous and extend integrally from upper surface 112 of the substrate 102. In some implementations, however, barrier walls 104 are discontinuous and can include a longitudinal column of spaced-apart wall segments defining longitudinal gaps therebetween (as described in detail below). In this example, the fastener product includes a pair of barrier walls spanning the length of the substrate in the longitudinal direction. Each of barrier walls 104 are positioned inboard of a respective longitudinal edge 114 of substrate 102.
When fastening product 100 is held against a flat surface, such as a surface of a mold pedestal (as discussed in detail below), barrier walls 104 contact the mold pedestal surface to inhibit (if not prevent) flowing resin from contacting fastening elements 110. Accordingly, in this example, the height of barrier walls 104 is at least as great as that of fastener elements 110. In some implementations, however, barrier walls 104 can be slightly shorter than fastener elements 110 (e.g., 0.004 inch or less in height). In these implementations, the barrier walls may not contact the mold pedestal surface. In some examples, a gap exists between the barrier walls and the flat surface of the pedestal that is small enough to inhibit or prevent foam intrusion. In some examples, the fastener elements are configured to bend or compress when held by force against the mold pedestal, to bring the barrier walls in contact with the flat surface of the pedestal.
Each of segmented walls 106 are disposed outboard of a respective barrier wall 104 (in lateral direction 103). In this example, segmented walls 106 are positioned along respective longitudinal edges 114 of substrate 102. Other appropriate configurations, however, can also be implemented. For example, segmented walls 106 can be positioned substantially inboard of longitudinal edges 114, leaving hangover extensions of the substrate outboard of the segmented walls. In this example, segmented walls 106 extend integrally from upper surface 112 and run parallel to barrier walls 104 down the length of substrate 102. As shown, each of segmented walls 106 includes a series of discrete wall segments 118. Wall segments 118 are spaced apart from one another to form longitudinal gaps 120 between adjacent segments. In some examples, the wall segments extend about 0.06 inch in the longitudinal direction of the base. Longitudinal gaps 120 can allow a flowable material (e.g., a liquefied or partially expanded foam) to pass through the segmented wall. In some examples, the longitudinal gaps have a maximum width along the longitudinal direction of the base that is at least about 0.02 inch. In a particular example, the longitudinal gaps have a width of about 0.11 inch.
Each of segmented walls 106 defines a respective flow gap. A flow gap can be described as the total exposed area of all flow enabled openings through and around the segmented wall. In this example, each of wall segments 118 has a height equaling that of barrier walls 104. Accordingly, the accumulation of longitudinal gaps 120 defines the flow gap of each segmented wall 106. In some implementations, however, the wall segments can be shorter than the barrier walls to augment the flow gap (as described in detail below). The dimensions of the flow gaps can be measured in terms of area per unit strip length of substrate 102. The dimensions of the flow gaps define the amount of foam that is allowed to pass through the segmented walls during the molding process of a foam article. In some examples, the flow gaps constitute between 8 percent and 50 percent of the effective area of the segmented walls.
Foam passing through segmented walls 106 enters foam relief spaces 122. The foam relief spaces are delimited by a respective segmented wall and its nearest barrier wall. The dimension of a foam relief space 122 can be measured in terms of its volume per unit strip length of substrate 102. The volume per unit strip length can be defined as a product of the distance between facing surfaces of a respective segmented wall and its nearest barrier wall and the height of the barrier wall.
In some cases, imperfections in a mold pedestal surface (e.g., scratches, dents, or uneven surfaces) can allow foam to flow past the barrier walls 104 and into contact with fastener elements 110. This can be inhibited (if not prevented), however, by permitting foam to enter and set-up in foam relief spaces 122. In some examples, the cured or solidified foam can form an integral seal with the mold tool surface, preventing flow past the barrier walls. Additionally, allowing the foam to set-up around wall segments 118 can increase the bond strength between fastening product 100 and a foam molded article (e.g., a seat cushion). For instance, the solidified foam around wall segments 118 can act as an anchor holding fastening product 100 to the seat cushion. In some examples, the fastener product is configured to achieve an appropriate ratio of foam relief space volume per unit strip length and flow gap area per unit strip length. This ratio will be referred to herein as the “foam relief ratio”. In some examples, the flow gaps and foam relief space can be appropriately dimensioned to provide an appropriate foam relief ratio.
Providing a fastener product with an appropriate foam relief ratio allows the foam passing through the flow gaps of segmented walls 106 to expand and set-up around wall segments 118, without exerting excessive force on fastening product 100. For example, when the foam relief ratio is too large, a deficient amount of foam enters the foam relief space. As a result, the solidified foam may not provide a strong anchor to the foam molded article. Conversely, when the foam relief ratio is too small, an excessive amount of foam enters the foam relief space. When the excessive amount of foam expands, a force is exerted on the fastening product (e.g., against substrate 102 and barrier walls 104). In some cases, the force may be sufficient to urge the fastening product away from the mold pedestal surface, allowing foam to pass under the barrier walls. In some examples, an appropriate foam relief ratio is between about 0.02 and 0.80 inch. Foam relief ratios between about 0.20 and 0.50 inch or about 0.30 and 0.45 inch can also be implemented.
Fastener elements 110 are flexible and extend upward from upper surface 112 of substrate 102. The fastener elements are arranged in discrete fields or arrays separated by lateral walls 108. Each of fastener elements 110 has a head spaced above upper surface 112, and each head has two distal tips that extend in opposite directions to form loop overhangs (i.e., palm-tree type fastening elements). Thus, the fastener elements are configured to releasably engage fibers of a mating component (not shown) to form a hook-and-loop fastening. Other appropriate types of fastening elements can also be used. For example, J-hook and/or mushroom-type fastening elements can be implemented.
In this example, lateral walls 108 laterally traverse an inner area between facing surfaces of respective barrier walls 104 to isolate arrays of fastener elements 110. In some implementations, however, the lateral walls extend beyond the barrier walls, traversing the inner area between facing surfaces of the outer segmented walls. Lateral walls 108, in conjunction with barrier walls 104 demarcate individual fastening cells 124. The fastener cells are effectively sealed against ingress of foam, when the fastening product is held against a flat surface of a mold pedestal. Each lateral wall 108 defines one or more gaps extending therethrough and connecting adjacent fastening cells 124. In this example, each lateral wall 108 defines one gap 126. The gaps 126 can extend from upper surface 112 of the substrate 102. The gaps 126 can also extend through an upper extent of the lateral walls 108. Other appropriate gap configurations, however, can also be implemented (as described in detail below).
The gaps 126 each define a lateral width. An appropriate lateral width of the gaps is configured to balance the properties of the fastening product, e.g., air releasing capability, bending flexibility, resistance to foam intrusion, and retention. The air releasing capability and flexibility of the fastening product increase with the presence and number of gaps, and resistance to foam intrusion decreases with the lateral width of the gaps. In some examples, the lateral gap width can be equal to a lateral width of the fastener elements 110. In a particular example, the lateral gap width is between about 0.002 and 0.015 inch or between about 0.004 and 0.012 inch. In some implementations, the lateral width of the gaps is constant over different distances from upper surface 112, such as when the gaps are defined between straight wall surfaces. In some other implementations, the lateral width of the gaps varies with distance from upper surface 112, e.g., the gaps are wider at their distal extent than at a height closer to upper surface 112.
As shown in
In a particular example, each of barrier walls 104, segmented walls 106, and lateral walls 108 extend from upper surface 112 of substrate 102 to a height of 0.051 inch. Barrier walls 104 and segmented walls 106 are provided having a thickness of 0.012 inch. In a particular example, the distance between facing surfaces of barrier walls 104 is 0.364 inch, and the distance between lateral walls 108 is 0.450 inch. Accordingly, the area of fastening cells 124 is about 0.164 inch. Such fastening cells can, for example, accommodate an array of 18 fastener elements. In a particular example, wall segments 118 have a length of about 0.124 inch and are spaced apart by about 0.029 inch to form longitudinal gaps 120. In a particular example, the width of foam relief spaces 122 (i.e., the distance between facing surfaces of a segmented wall and its nearest barrier wall) is 0.030 inch. Accordingly, the foam relief ratio is about 0.16 inch. In some examples, the combined width of the foam relief spaces can be between about 10 percent and 35 percent of the total width of the substrate.
Turning to
In some examples, the foam disrupters 132 have a height less than a height of the lateral walls, e.g., about a half of the height of the lateral walls 108. In some other cases, the disruptors extend to the same height as the lateral walls. In some examples, the foam disrupters 132 extend, in a side profile, to distal points. In a particular example, the distal points define a point radius of less than 0.0015 inch. Each gap may have one or more adjacent foam disrupters. In this example, a pair of spaced-apart foam disrupters 132 is adjacent each gap 126 in a straight-line sequence. Other configurations of the foam disrupters can also be used.
Longitudinal grooves 134 allow an outer portion the fastener product to flex relative to an inner portion. The degree of flexure is determined based on the material properties of the substrate and the dimensions of the grooves. In some examples, the grooves have a lateral width that is equal to a lateral width of the gaps 126 or a lateral width of the fastener elements 110. In a particular example, the grooves are about 0.013 inch wide, and about 0.0065 inch deep. In some cases, the grooves have sharp corners and flat bottoms. In some other cases, the grooves have curved bottom surfaces, and may form a portion of a cylinder.
For fastener product 100p, as shown in
In some implementations, gaps may extend into the substrate. For example, for fastener product 100s, lateral walls 108s extend from upper surface of the substrate 102s, while gap 126s extends from a position below the upper surface and within the substrate 102s. In a particular example, the substrate has a thickness of about 0.012 inch, and the gap 126s extends downwardly into the substrate about 0.005 inch.
In some implementations, the gaps can be configured to vary with distance from upper surface of the substrate. For example, the gaps may be wider at their distal extent than at a height closer to upper surface of the substrate. As shown in
The transverse wall gaps in various transverse walls of the product need not be laterally aligned. Laterally aligned gaps may be formed by molding about a common ring of a molding roll, but gaps in different transverse walls can be formed by different rings, such that the gaps of different transverse walls are differently spaced from a longitudinal edge of the product. Such purposeful misalignment may be useful, for example, in tailoring flexure resistance of the product along its length.
Referring to
As shown, foam disrupters 226 are arranged in a straight-line longitudinal sequence, such that each of the foam disrupters is spaced apart from any neighboring foam disrupters by a constant interval. Further, in this example, foam disrupters 226 are aligned with each of longitudinal gaps 220. As such, the foam disrupters can contact incoming foam before the foam sets-up (e.g., while the foam is still at least partially liquefied) and cannot be effectively disrupted. Other configurations of the foam disrupters can also be used, however. For example, additional foam disrupters that are not aligned with the longitudinal gaps can be provided. Further, in some implementations, the density of foam disrupters per unit strip length of the substrate varies. For instance, a first length of the substrate can be provided with more or less foam disrupters than a second length. In this example, the foam disrupters are provided in the form of small molded spikes or barbs having the shape of a triangular prism. However, other types of foam disrupters can also be used (e.g., upstanding stems or prongs). The height of the foam disrupters is at most equal to that of the fastening elements.
Foam disrupters 226 are configured to disturb the structure of foam entering the foam relief spaces. For example, the foam disrupters can collapse the foam by breaking foam bubbles. Collapsing foam entering foam relief spaces 222 increases the foam's density. As a result, the strength the foam is increased while its expansion ratio is decreased. Accordingly, providing an appropriate configuration of foam disrupters 226 allows the foam passing through the flow gaps of segmented walls 206 to expand and set-up in foam relief spaces 222, without exerting excessive force on fastening product 200. As noted above, in some cases, expansion of the foam can exert sufficient force to urge the fastening product away from the flat surface of a mold pedestal surface, allowing foam to enter into the interior of the fastening cells. Foam disrupters 226 can also serve as additional anchor points holding the fastener product to a molded article when the foam cures or sets up in the foam relief spaces.
In a particular example, each of the foam disrupters extends from the upper surface of the substrate to a height of 0.012 inch, and widthwise (i.e., in the lateral direction of the substrate) to 0.006 inch. The foam disrupters are disposed within the foam relief spaces at a constant longitudinal distance interval of about 0.154 inch.
Other implementations of the foam disrupters can also be used. For example, the foam disrupters can be provided in the form of a surface roughness (e.g., foam disrupters with a height between about 1 and 100 nanometers) applied to one or more of the walls delimiting the foam relief spaces. In some examples, the foam disrupters are placed at random within the foam relief spaces, such that no discernable pattern or sequence is achieved. In some examples, the foam disrupters can have various appropriate sizes and shapes.
Referring to
Hinges 328 can allow outer portions 330 (e.g., the portions of the fastener product outboard of the hinges) of the fastener product to flex relative to an inner portion 332. The degree of flexure is determined based on the material properties of the base substrate and the dimensions of the hinges. In a particular example, the hinges are 0.013 inch wide, and about 0.0065 inch deep. Allowing the outer edge portions to flex relative to the inner portion of the fastener can reduce stress near the longitudinal edges of the substrate. These stresses can result from various operations in forming the molded foam article. For example, in molding the article, stress is imparted on the fastening product near its longitudinal edges when foam expands in the foam relief spaces. High stress also occurs during other common processes such as de-molding and roller crushing. When the fastener product is secured to the molded product, the hinges allow the outer portions to move with the cured foam. As a result, crack formation and propagation near the longitudinal edges is inhibited.
As shown, hinges 328 extend longitudinally along the length of the substrate, substantially parallel to the barrier walls and segmented walls of the fastening product. However, in some examples, the fastening product can include lateral hinges that traverse the width of the fastener product. The lateral hinges can be incorporated into the backside surface of the substrate 302, and disposed at predetermined intervals down the substrate's length. Incorporating lateral hinges into the fastening product can increase flexibility in the longitudinal direction, such that the fastening product is more suited for winding about a take-up roll and forming a continuous spool.
Referring to
Referring to
As shown, the barrier walls 504 and lateral walls 508 of each segment 501 define a fastener cell 524 which seals fastener elements 510 from contact with foam material during a molding process. Fastener elements 510a, which are disposed outside of fastener cells 524, remain exposed during the molding process. As such, when fastener product 500 is held against a mold pedestal, flowing foam is allowed to contact and surround fastener elements 510a, but not fastener members 510. Therefore, fastener elements 510a can act as anchor points for securing fastener product 500 to a molded foam article, while fastener elements 510 remain available for engagement to a mating fastening component. Additionally, flowing foam may pass through gaps 526 and into fastener cells 524. In this case, the gaps 526 can be configured to be small enough such that only a small amount of foam passes into fastener cells but is inhibited from contacting fastener elements 510. With solidified foam, the gaps 526 can act as additional anchor points for better holding fastener product 500 to the molded foam article.
In some examples, the barrier walls and segmented walls of each fastening segment provide foam relief spaces that are appropriately dimensioned based on a foam relief ratio (as described above). In some examples, each of the fastening segments includes multiple foam disrupters positioned within the foam relief spaces (as described above). The foam disrupters can be configured to disturb the structure of foam entering the foam relief spaces. In some examples, each of the fastening segments includes hinges positioned in the foam relief spaces (as described above) that allow outer portions of the fastener product to flex relative to an inner portion.
The fastening products described above may be used in a variety of fastening applications. For example, in addition to conventional foam molding applications, the arrangements of the fastening elements and walls can also be employed on a rigid fastening surface, such as injection molded fastening products. The following description provides details of an example application of a fastening product having the types of configurations discussed above.
As shown in
Referring to
As the liquid foam fills the mold cavity, the foam is allowed to pass through segmented walls in the fastening product and enter appropriately dimensioned foam relief spaces. The foam relief spaces allow the foam to expand without forcing the fastener product away from the mold pedestal surface. In some cases, a limited amount of foam also flows into the gaps within the lateral walls bordering fastening cells near the ends of the products. The walls of the fastening cells rest against the flat pedestal surface, effectively preventing excessive fouling of the fastening elements.
Referring to
Other appropriate molding techniques and apparatus can be used to form a molded article with an incorporated fastener product. For instance, in some examples, the fastening product can be placed directly on a surface of the mold (e.g., in a trench of the mold), as opposed to the mold pedestal surface shown and described herein.
The fastener products disclosed herein can be formed as flexible, continuous strips or sheets of material in a continuous roll molding process. Referring to
Pressure in the nip forces the molten resin into the various cavities, leaving some resin remaining on the cavity roller surface. The resin travels around the cavity roller, which is chilled to promote resin solidification, and the solidified product is then stripped from the cavity roller by pulling the solidified fastener elements and walls from their respective cavities. The fastener elements, walls and their respective cavities are illustrated schematically and are not to scale. In many cases the cavity roller will be of a diameter of between 30 and 50 centimeters, and the fastener elements and walls will be less than 1.5 millimeter in height (as described above), to give a sense of perspective.
After the continuous length of fastening material is formed, it moves through a die-cutting station 1720, where discrete fastener products are sequentially severed from the material. The remaining fastener material may be discarded or, in some cases, ground up and recycled to make further material.
Referring to
Referring to
To form gaps extending through the lateral walls, gap rings 1930 can be inserted among the hook rings 1912 and spacer rings 1920. The gap rings 1930 are intentionally configured to include no cavities aligned with cavities 1918. When molten resin is forced into a nip between pressure roller 1710 and cavity roller 1712, the molten resin forms the lateral walls in cavities 1918, but not in areas of the gap rings 1930, such that gaps are formed in the lateral walls. Different gap configurations can be achieved by configuring parameters of gap rings (e.g., number and thickness of gap rings).
In some examples, hook rings 1912, spacer rings 1920 and gap rings 1930 have the same diameter, and the formed gaps extend from upper surface of the base substrate of the formed fastener products (e.g., the gap 126p of
Referring to
Referring to
In some examples, a continuous spool of the fastener product can be severed so as to leave a partial, open cell at each end, the partial cells containing a number of fastening elements 2110a exposed to foam, as shown. In this example, the exposed fastening elements are embedded in the foam and act as anchor points to retain the ends of the cut product to the molded foam article. Further, the flowing foam 3100 may pass through the gaps 2126 defined through the lateral walls 2108 nearest the ends of the product and into the adjacent fastening cells 2124. With an appropriate lateral width and/or gap configuration, as discussed above, gaps 2126 may be configured to allow only a small amount of foam into the adjacent cell, such that the flowing foam is inhibited from contacting the fastener elements 2110, or limited to contacting only a few of the fastener elements, in the adjacent cell and is prevented from entering further fastener cells. Additionally, with the solidified foam, the gaps 2126 can act as additional anchor points to better hold the fastener product 2100 to the molded foam article.
Referring to
Referring next to
It will be seen by those skilled in the art that many embodiments taking a variety of specific forms and reflecting changes, substitutions, and alternations can be made without departing from the spirit and scope of the invention. Therefore, the described embodiments illustrate but do not restrict the scope of the claims.
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