WO2008016690A2 - Fabrics having knit structures exhibiting auxetic properties and garments formed thereby - Google Patents

Fabrics having knit structures exhibiting auxetic properties and garments formed thereby Download PDF

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Publication number
WO2008016690A2
WO2008016690A2 PCT/US2007/017278 US2007017278W WO2008016690A2 WO 2008016690 A2 WO2008016690 A2 WO 2008016690A2 US 2007017278 W US2007017278 W US 2007017278W WO 2008016690 A2 WO2008016690 A2 WO 2008016690A2
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Prior art keywords
fabric
auxetic
garment
knit structure
portions
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Application number
PCT/US2007/017278
Other languages
French (fr)
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WO2008016690A3 (en
Inventor
Michael Starbuck
Cander Anad Subhash
Naveen Ravirala
Kim Lesley Alderson
Andrew Alderson
Original Assignee
Hbi Branded Apparel Enterprises, Llc
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Application filed by Hbi Branded Apparel Enterprises, Llc filed Critical Hbi Branded Apparel Enterprises, Llc
Publication of WO2008016690A2 publication Critical patent/WO2008016690A2/en
Publication of WO2008016690A3 publication Critical patent/WO2008016690A3/en

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/06—Patterned fabrics or articles
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B1/00—Footwear characterised by the material
    • A43B1/02—Footwear characterised by the material made of fibres or fabrics made therefrom
    • A43B1/04—Footwear characterised by the material made of fibres or fabrics made therefrom braided, knotted, knitted or crocheted
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B23/00—Uppers; Boot legs; Stiffeners; Other single parts of footwear
    • A43B23/02—Uppers; Boot legs
    • A43B23/0205—Uppers; Boot legs characterised by the material
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B23/00—Uppers; Boot legs; Stiffeners; Other single parts of footwear
    • A43B23/02—Uppers; Boot legs
    • A43B23/0245—Uppers; Boot legs characterised by the constructive form

Definitions

  • the present disclosure is related to knit structures for fabrics. More particularly, the present disclosure is related to fabrics having knit structures that exhibit auxetic properties and garments formed thereby.
  • Such garments can often include one or more support and/or shaping areas.
  • the shaping and/or supporting functions of such garments have been achieved using various combinations of elastic members, foam members, support structures, such as underwires, and the like.
  • a fabric comprising a knit structure having a geometric shape imparting an auxetic property to the fabric due to rotation of one or more portions of the knit structure.
  • a fabric comprising a knit structure having a triangular lattice shape that imparts an auxetic property to the fabric.
  • a garment comprising a fabric having a knit structure that imparts an auxetic property to the fabric due to rotation of one or more portions of the knit structure.
  • a garment comprising a fabric with a triangular lattice knit structure that imparts an auxetic property to the fabric.
  • FIG. 1 illustrates materials having positive and negative Poisson's ratios under out-of-plane bending
  • FIG. 2 illustrates materials having positive and negative Poisson's ratios under in-plane tension
  • FIG. 3 illustrates a typical warp knit fabric
  • FIG. 4 is a micrograph of a first embodiment of a fabric according to the present disclosure in a relaxed or normal state;
  • FIG. 5 is a close up micrograph of a portion of the fabric of FIG. 4 having the approximate geometric knit structure of a single repeat unit superimposed thereon;
  • FIG. 6A illustrates the approximate geometric structure of the single repeat unit of FIG. 5 in the relaxed state
  • FIG. 6B illustrates the approximate geometric structure of the single repeat unit of FIG. 5 in the deformed state
  • FIG. 7A illustrates a tessellating pattern of the repeat unit of 6A
  • FIG 7B illustrates a tessellating pattern of the repeat unit of 6B
  • FIG. 8 is a graph plotting changes in width and length of the fabric of FIG. 4.
  • FIG. 9 is a graph plotting transverse strain data to longitudinal strain data of the.fabric of FIG. 4.
  • materials in 'plate' form generally adopt a saddle- shape curvature when exposed to out of plane bending as a result of the positive Poisson's ratio.
  • materials having a positive Poisson's ratio when exposed to in-plane forces, namely when placed in tension in the y- direction, contract in a direction transverse (e.g., the x-direction) to the direction of the tensile load. It has been determined by the present disclosure that fabrics exhibiting the aforementioned properties (e.g., saddle curvature and positive Poisson's contraction) can, when used to form a garment, reduce the fit of the garment.
  • the present disclosure provides fabrics having knit structures that exhibit auxetic properties.
  • Materials having "auxetic" properties are those materials that have a zero or negative Poisson's ratio.
  • An example of a material have a negative Poisson's ratio is discussed in detail with respect to FIGS 1B and 2B.
  • materials having auxetic properties when subject to out of plane bending, undergo dome-shape curvature.
  • a relatively stiff garment having the auxetic knit structures of the present disclosure when exposed to out-of-plane forces due to body movements, retains a better fit to the body as compared to those having the positive Poisson's ratio as in FIG. 1A.
  • the present disclosure provides fabrics having a knit structure such that, when the used in a garment, naturally adopts to the doubly-curved human form yet also have the ability to grow or shrink in all directions simultaneously.
  • auxetic behavior is believed to arise due to the interplay between the geometric structure of the material and one or more mechanisms with which the geometrical structure deforms.
  • the geometric structure is a re-entrant honeycomb and the mechanism with which this structure deforms is rotation or hinging of the walls or ribs of the honeycomb.
  • the table below provides a summary of the main structures and deformation mechanisms that are believed to give rise to auxetic behavior contemplated for use in knit structures by the present disclosure.
  • fabrics having knit structures according to the present disclosure are described as warp knit fabrics.
  • the fabrics of the present disclosure can be any knit fabric such as, but not limited to, weft knit fabrics.
  • Typical warp knit fabric as illustrated in FIG. 3, has a series of courses and a series of wales. Each course is a row of loops or stitches running across the width of the knit fabric as shown in FIG. 3A. Each wale is a column of loops or stitches running along the length (e.g., warp direction) of the knit fabric as shown in FIG. 3B.
  • Knit structure 12 includes loops or stitches to form a triangular lattice structure 14 (only one illustrated).
  • triangular lattice structures are believed to exhibit auxetic properties via both the rib rotation and deformation mechanisms. Specifically, triangular lattice structures are believed to exhibit auxetic properties via rib hinging, rib flexure, rib stretching, and any combinations thereof.
  • Triangular lattice structure 14 has an internal angle ⁇ and an external angle ⁇ . Internal angle ⁇ is the angle between a centerline 16 and a side 18, while external angle ⁇ is the angle between the centerline and an end 20.
  • external angle ⁇ is between greater than about zero degrees and less than about ninety degrees.
  • first direction 22 as shown in FIGS. 6B and 7B
  • the ends 20 of triangular lattice structure 14 hinge so that external angle ⁇ increases but remains less than about 90 degrees.
  • triangular lattice structure 14 deforms by hinging to expand in a second direction 24, where the second direction is about normal to the first direction 22.
  • Triangular lattice structure 14 is illustrated in FlG. 7 in tessellated form, namely formed into a mosaic with a plurality of the triangular lattice structures 14.
  • Triangular lattice structure 14 in FIG. 7B having a deformed cell structure due to the application of tension 22 has undergone expansion both along the direction of the applied tension (e.g., first direction 22) and transverse to the direction of the applied tension (e.g., second direction 24) with respect to the relaxed tessellated structure in FIG. 7A.
  • triangular lattice structure 14 is auxetic when deformation is due to the rotation of the ribs 18, 20 making up the structure.
  • triangular lattice structure 14 is oriented so that centerline 16 is approximately normal to the warp direction.
  • auxetic properties of fabric 10 were characterized using combined mechanical testing and vtdeoextensometry.
  • fabric 10 was knitted on a warp knitting machine to include triangular lattice structure 14 and heat set. Fabric 10 was then cut into swaths of about 15 centimeters (cm) long by about 5 cm wide. The swaths were cut at about 45° to the warp direction.
  • FIG. 8 shows the width and length videoextensometry data for the fabric of FIG. 4 when subject to tensile load application along a direction that is at -45° to the warp direction.
  • FIG. 8 shows that, as the fabric is pulled to increase in length, it expands (increases in width) and, therefore, possesses negative Poisson's ratio behavior.
  • ⁇ is the strain
  • I and I 0 are the length and original length, respectively, in the direction of interest.
  • the Poisson's ratio vy which determines the change in width (along the transverse j direction) for stretching along the i direction is defined by:
  • the transverse and longitudinal strains were plotted against each other, with the slope of the resultant graph being, by definition, equal to -Vr 1 , where i is the direction of loading and j is the width direction.
  • the resultant strains were plotted and are shown in FIG. 9.
  • the data in FIG. 8 contain the derived strains for the average of all 10 transverse sections measured during the test.
  • knit fabrics having knit structures according to the present disclosure are provided that display the auxetic (zero or negative Poisson's ratio) property.
  • auxetic knit structure 12 is a triangular lattice structure 14.
  • fabric 10 it is contemplated by the present disclosure for fabric 10 to have auxetic knit structure 12 with any structure sufficient to impart the desired auxetic property.
  • auxetic knit structure 12 it is contemplated by the present disclosure for auxetic knit structure 12 to have a geometric shape that is selected from the group consisting of a re-entrant honeycomb, a star network, a re-entrant rhombic dodecahedron, a triangular lattice, rotating squares, rotating triangles, rotating tetrahedra, a chiral honeycomb, interlocked hexagons, interlocked quadrilaterals, interlocked triangles, and any combinations thereof.
  • auxetic knit structure 12 having any structure sufficient to impart the desired auxetic property by any desired mechanism.
  • auxetic knit structure 12 can exhibit auxetic properties via the rotation mechanism, the deformation mechanism, the translation mechanism, and any combinations thereof.
  • auxetic knit structure 12 can exhibit auxetic properties via rib hinging, flexure, rib stretching, and any combinations thereof.
  • fabric 10 it is contemplated by the present disclosure for fabric 10 to have yarns made of natural fibers, synthetic fibers, or combinations thereof. In some embodiments, it is contemplated by the present disclosure fabric 10 to have yarns made of auxetic fibers themselves, such as are disclosed in U.S. Patent No. 6,878,320, the contents of which are incorporated by reference herein. In these embodiments, fabric 10 can exhibit auxetic (zero or negative Poisson's ratio) properties not only based on the knit structure, but also due to the yarn itself.
  • fabrics according to the present disclosure find use in the manufacture of garments such as, but not limited to, a brassiere, a panty, a camisole, a bathing suit, a pair of pantyhose, a leotard, a retention bandage, a support device, a compression bandage, and others.
  • fabric 10 can form a portion of the garment or can be used to form all of the garment.
  • Fabric 10 can form all or part of various apparel garments such as: a moldable part of the garment such as, a bra cup; a figure control garment such as a foundation garment or corset; thermal-wear, where a volume of air can be trapped-i ⁇ by the auxetic fabric property for insulation; and others.
  • fabric 10 can form all or part of various medical garments such as: retention bandages; compression bandages; seamless shaped body garments for wounds suffered due to burns; and others.
  • fabrics according to the present disclosure can be knit on many commercially available circular knitting machines, which knit the fabric into a seamless tube.

Abstract

A fabric is provided that includes a knit structure having a geometric shape imparting an auxetic property to the fabric due to rotation of one or more portions of the knit structure. In some aspects, the fabric includes a knit structure having a triangular lattice shape that imparts an auxetic property to the fabric.

Description

FABRICS HAVING KNIT STRUCTURES EXHIBITING AUXETIC PROPERTIES
AND GARMENTS FORMED THEREBY
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0002] The present disclosure is related to knit structures for fabrics. More particularly, the present disclosure is related to fabrics having knit structures that exhibit auxetic properties and garments formed thereby.
2. Description of Related Art
[0003] Many types of apparel garments, such as but not limited to, panties, brassieres, camisoles, bathing suits, pantyhose, leotards, and others have been proposed. Similarly, many medical garments, such as but not limited to, retention bandages, support devices, and/or compression bandages have been proposed. As used herein, such apparel and/or medical garments are hereinafter individually and/or collectively referred to as "garments".
[0004] Such garments can often include one or more support and/or shaping areas. Typically, the shaping and/or supporting functions of such garments have been achieved using various combinations of elastic members, foam members, support structures, such as underwires, and the like.
[0005] it is known that many garments have a tendency to "creep" or "ride-up" during use. This tendency can result in the garment, or portions of thereof, moving from a desired position, to an undesired position. Garments in this undesired position can be a source of discomfort and/or can provide a less than optimal aesthetic appearance. In the example where the garment is a shape or support garment, the garment often provides less than optimal support or shaping characteristics when in the undesired position. Further, the tendency to creep to an undesired position can also require the user to adjust the garment in order to return the garment to its correct position. When the garment is an intimate apparel garment, the requirement for such adjustments can be a source of embarrassment.
[0006] According Iy, there is a continuing need for fabric and garments made therefrom that overcome, alleviate, and/or mitigate one or more of the above deleterious effects of the prior art. BRIEF SUMMARY OF THE INVENTION
[0007] It is an object of the present disclosure to provide fabrics having knit structures that exhibit auxetic properties.
[0008] It is another object to provide an auxetic knit structure that can be produced on a warp knitting machine.
[0009] These and other objects and advantages of the present disclosure are provided by a fabric comprising a knit structure having a geometric shape imparting an auxetic property to the fabric due to rotation of one or more portions of the knit structure.
[0010] These and other objects and advantages of the present disclosure are also provided by a fabric comprising a knit structure having a triangular lattice shape that imparts an auxetic property to the fabric.
[0011] Further objects and advantages of the present disclosure are provided by a garment comprising a fabric having a knit structure that imparts an auxetic property to the fabric due to rotation of one or more portions of the knit structure. [0012] Still further objects and advantages of the present disclosure are provided by a garment comprising a fabric with a triangular lattice knit structure that imparts an auxetic property to the fabric.
[0013] The above-described and other features and advantages of the present disclosure will be appreciated and understood by those skilled in the art from the following detailed description, drawings, and appended claims.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0014] FIG. 1 illustrates materials having positive and negative Poisson's ratios under out-of-plane bending;
[0015] FIG. 2 illustrates materials having positive and negative Poisson's ratios under in-plane tension;
[0016] FIG. 3 illustrates a typical warp knit fabric;
[0017] FIG. 4 is a micrograph of a first embodiment of a fabric according to the present disclosure in a relaxed or normal state; [0018] FIG. 5 is a close up micrograph of a portion of the fabric of FIG. 4 having the approximate geometric knit structure of a single repeat unit superimposed thereon;
[0019] FIG. 6A illustrates the approximate geometric structure of the single repeat unit of FIG. 5 in the relaxed state;
[002O]FIG. 6B illustrates the approximate geometric structure of the single repeat unit of FIG. 5 in the deformed state;
[0021] FIG. 7A illustrates a tessellating pattern of the repeat unit of 6A;
[0022] FIG 7B illustrates a tessellating pattern of the repeat unit of 6B;
[0023] FIG. 8 is a graph plotting changes in width and length of the fabric of FIG. 4; and
[0024] FIG. 9 is a graph plotting transverse strain data to longitudinal strain data of the.fabric of FIG. 4.
DETAILED DESCRIPTION OF THE INVENTION
[0025] Materials that exhibit positive Poisson's ratio properties, which are discussed in detail with respect to FIGS 1 A and 2A, have been determined by the present disclosure, when used in a garment, to reduce the fit of the resultant garment.
[0026] As show in FIG. 1A1 materials in 'plate' form generally adopt a saddle- shape curvature when exposed to out of plane bending as a result of the positive Poisson's ratio. As shown in FIG. 2A, materials having a positive Poisson's ratio, when exposed to in-plane forces, namely when placed in tension in the y- direction, contract in a direction transverse (e.g., the x-direction) to the direction of the tensile load. It has been determined by the present disclosure that fabrics exhibiting the aforementioned properties (e.g., saddle curvature and positive Poisson's contraction) can, when used to form a garment, reduce the fit of the garment.
[0027]Advantageously, the present disclosure provides fabrics having knit structures that exhibit auxetic properties. Materials having "auxetic" properties, as used herein, are those materials that have a zero or negative Poisson's ratio. An example of a material have a negative Poisson's ratio is discussed in detail with respect to FIGS 1B and 2B. [0028] As shown in FIG. 1B, materials having auxetic properties, when subject to out of plane bending, undergo dome-shape curvature. Accordingly, a relatively stiff garment having the auxetic knit structures of the present disclosure, when exposed to out-of-plane forces due to body movements, retains a better fit to the body as compared to those having the positive Poisson's ratio as in FIG. 1A.
[0029]As shown in FIG. 2B, materials having a negative Poisson's ratio, when exposed to in-plane forces, namely when placed in tension in the y-direction, expand in a direction transverse (e.g., the x-direction) to the direction of the tensile load. Thus, a garment having the auxetic knit structures of the present disclosure, when exposed to in-plane forces due to body movements, due to an increase in body size and/or shape, results in a concomitant Poisson's ratio- induced increase in the x-direction (when the Poisson's ratio is negative). Alternately, no increase or decrease in the x-direction results when the Poisson's ratio is zero. This expansion and/or lack of contraction retains a better fit to the body as compared to those having the positive Poisson's ratio as in FIG. 2A.
[0030]Thus, the present disclosure provides fabrics having a knit structure such that, when the used in a garment, naturally adopts to the doubly-curved human form yet also have the ability to grow or shrink in all directions simultaneously.
[0031] Without wishing to be bound to any particular theory, auxetic behavior is believed to arise due to the interplay between the geometric structure of the material and one or more mechanisms with which the geometrical structure deforms. In the classic example of auxetic behavior illustrated in FIG. 2B1 the geometric structure is a re-entrant honeycomb and the mechanism with which this structure deforms is rotation or hinging of the walls or ribs of the honeycomb. The table below provides a summary of the main structures and deformation mechanisms that are believed to give rise to auxetic behavior contemplated for use in knit structures by the present disclosure.
Table 1:
Figure imgf000009_0001
Figure imgf000010_0001
[0032] For purposes of clarity, exemplary embodiments of fabrics having knit structures according to the present disclosure are described as warp knit fabrics. However, it should be recognized that the fabrics of the present disclosure can be any knit fabric such as, but not limited to, weft knit fabrics. •
[0033] Typical warp knit fabric, as illustrated in FIG. 3, has a series of courses and a series of wales. Each course is a row of loops or stitches running across the width of the knit fabric as shown in FIG. 3A. Each wale is a column of loops or stitches running along the length (e.g., warp direction) of the knit fabric as shown in FIG. 3B.
[0034] Referring now to FIGS. 4 and 5, a first exemplary embodiment of a warp knit fabric 10 having an auxetic knit structure 12 according to the present disclosure is shown. Knit structure 12 includes loops or stitches to form a triangular lattice structure 14 (only one illustrated).
[0035]As seen from Table 1 above, triangular lattice structures are believed to exhibit auxetic properties via both the rib rotation and deformation mechanisms. Specifically, triangular lattice structures are believed to exhibit auxetic properties via rib hinging, rib flexure, rib stretching, and any combinations thereof.
[0036] For purposes of clarity, only the rib hinging mechanism of triangular lattice structure 14 is discussed in detail below with respect to FIGS. 6 and 7. Triangular lattice structure 14 has an internal angle α and an external angle β. Internal angle α is the angle between a centerline 16 and a side 18, while external angle β is the angle between the centerline and an end 20.
[0037] Under normal or relaxed conditions shown in FIGS. 6A and 7A, external angle β is between greater than about zero degrees and less than about ninety degrees. However, upon application of tension in a first direction 22 as shown in FIGS. 6B and 7B, the ends 20 of triangular lattice structure 14 hinge so that external angle β increases but remains less than about 90 degrees. In this manner, triangular lattice structure 14 deforms by hinging to expand in a second direction 24, where the second direction is about normal to the first direction 22.
[0038]Triangular lattice structure 14 is illustrated in FlG. 7 in tessellated form, namely formed into a mosaic with a plurality of the triangular lattice structures 14. Triangular lattice structure 14 in FIG. 7B having a deformed cell structure due to the application of tension 22 has undergone expansion both along the direction of the applied tension (e.g., first direction 22) and transverse to the direction of the applied tension (e.g., second direction 24) with respect to the relaxed tessellated structure in FIG. 7A. Thus, triangular lattice structure 14 is auxetic when deformation is due to the rotation of the ribs 18, 20 making up the structure.
[0039] In this illustrated embodiment, triangular lattice structure 14 is oriented so that centerline 16 is approximately normal to the warp direction.
[0040]The auxetic properties of fabric 10 were characterized using combined mechanical testing and vtdeoextensometry.
[0041]During testing, fabric 10 was knitted on a warp knitting machine to include triangular lattice structure 14 and heat set. Fabric 10 was then cut into swaths of about 15 centimeters (cm) long by about 5 cm wide. The swaths were cut at about 45° to the warp direction.
[0042] FIG. 8 shows the width and length videoextensometry data for the fabric of FIG. 4 when subject to tensile load application along a direction that is at -45° to the warp direction. FIG. 8 shows that, as the fabric is pulled to increase in length, it expands (increases in width) and, therefore, possesses negative Poisson's ratio behavior.
[0043] The width and length data were converted to transverse and axial strains, respectively, using the definition of true strain given by:
Figure imgf000013_0001
where ει is the strain, and I and I0 are the length and original length, respectively, in the direction of interest. The Poisson's ratio vy which determines the change in width (along the transverse j direction) for stretching along the i direction is defined by:
Figure imgf000013_0002
[0044] The transverse and longitudinal strains were plotted against each other, with the slope of the resultant graph being, by definition, equal to -Vr1, where i is the direction of loading and j is the width direction. The resultant strains were plotted and are shown in FIG. 9. The data in FIG. 8 contain the derived strains for the average of all 10 transverse sections measured during the test.
[0045] Next, linear best fit lines were applied to the data set in FIG. 9, to result in a value of Vi2 = -0.20. The data from the testing supports this finding, as the data showed that fabric 10 has vi2 = -0.22±0.03 and v2i = -0.13±0.02.
[0046] As seen from the example above, knit fabrics having knit structures according to the present disclosure are provided that display the auxetic (zero or negative Poisson's ratio) property.
[0047] It should be recognised that fabric 10 is discussed above by way of example where auxetic knit structure 12 is a triangular lattice structure 14. Of course, it is contemplated by the present disclosure for fabric 10 to have auxetic knit structure 12 with any structure sufficient to impart the desired auxetic property. For example, it is contemplated by the present disclosure for auxetic knit structure 12 to have a geometric shape that is selected from the group consisting of a re-entrant honeycomb, a star network, a re-entrant rhombic dodecahedron, a triangular lattice, rotating squares, rotating triangles, rotating tetrahedra, a chiral honeycomb, interlocked hexagons, interlocked quadrilaterals, interlocked triangles, and any combinations thereof. [0048] It should also be recognised that fabric 10 is discussed above by way of example where the auxetic property is believed to be, at least in part, imparted by rib hinging. Of course, it is contemplated by the present disclosure for fabric 10 to have auxetic knit structure 12 having any structure sufficient to impart the desired auxetic property by any desired mechanism. For example, it is contemplated by the present disclosure for auxetic knit structure 12 to exhibit auxetic properties via the rotation mechanism, the deformation mechanism, the translation mechanism, and any combinations thereof. Thus, auxetic knit structure 12 can exhibit auxetic properties via rib hinging, flexure, rib stretching, and any combinations thereof.
[0049] It is contemplated by the present disclosure for fabric 10 to have yarns made of natural fibers, synthetic fibers, or combinations thereof. In some embodiments, it is contemplated by the present disclosure fabric 10 to have yarns made of auxetic fibers themselves, such as are disclosed in U.S. Patent No. 6,878,320, the contents of which are incorporated by reference herein. In these embodiments, fabric 10 can exhibit auxetic (zero or negative Poisson's ratio) properties not only based on the knit structure, but also due to the yarn itself.
[0050] Advantageously, fabrics according to the present disclosure find use in the manufacture of garments such as, but not limited to, a brassiere, a panty, a camisole, a bathing suit, a pair of pantyhose, a leotard, a retention bandage, a support device, a compression bandage, and others. Here, fabric 10 can form a portion of the garment or can be used to form all of the garment. Fabric 10 can form all or part of various apparel garments such as: a moldable part of the garment such as, a bra cup; a figure control garment such as a foundation garment or corset; thermal-wear, where a volume of air can be trapped-iπ by the auxetic fabric property for insulation; and others. In addition, fabric 10 can form all or part of various medical garments such as: retention bandages; compression bandages; seamless shaped body garments for wounds suffered due to burns; and others.
[0051] Advantageously, fabrics according to the present disclosure can be knit on many commercially available circular knitting machines, which knit the fabric into a seamless tube.
[0052] It should also be recognized that the terms "first", "second", "third", "upper", "lower", and the like may be used herein to modify various elements. These modifiers do not imply a spatial, sequential, or hierarchical order to the modified elements unless specifically stated.
[0053] While the present disclosure has been described with reference to one or more exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular embodiment(s) disclosed as the best mode contemplated, but that the disclosure will include all embodiments falling within the scope of the appended claims.

Claims

CLAIMSWhat is claimed is:
Claim 1. A fabric comprising a knit structure having a geometric shape imparting an auxetic property to the fabric due to rotation of one or more portions of said knit structure.
Claim 2. The fabric as in claim 1, wherein said geometric shape imparts said auxetic property due to deformation of said one or more portions.
Claim 3. The fabric as in claim 1, wherein said geometric shape imparts said auxetic property due to translation of said one or more portions.
Claim 4. The fabric as in claim 1, wherein said geometric shape is selected from the group consisting of a re-entrant honeycomb, a star network, a re-entrant rhombic dodecahedron, a triangular lattice, rotating squares, rotating triangles, rotating tetrahedra, a chiral honeycomb, interlocked hexagons, interlocked quadrilaterals, interlocked triangles, and any combinations thereof.
Claim 5. The fabric as in claim 1, wherein the fabric is a weft knit fabric or a warp knit fabric.
Claim 6. The fabric as in claim 1, wherein the fabric comprises a seamless tube.
Claim 7. The fabric as in claim 1 , wherein said knit structure comprises yarns made of a material selected from the group consisting of natural fibers, synthetic fibers, auxetic fibers, and any combinations thereof.
Claim 8. The fabric as in claim 1 , wherein said auxetic property comprises a Poisson's ratio equal to zero.
Claim 9. The fabric as in claim 1 , wherein said auxetic property comprises a negative Poisson's ratio.
Claim 10. A fabric comprising a knit structure having a triangular lattice shape that imparts an auxetic property to the fabric.
Claim 11. The fabric as in claim 10, wherein said auxetic property is imparted due to rotation of one or more portions of said knit structure, and/or translation of said one or more portions, and/or deformation of said one or more portions.
Claim 12. The fabric as in claim 10, wherein said knit structure comprises yarns made of a material selected from the group consisting of natural fibers, synthetic fibers, auxetic fibers, and any combinations thereof.
Claim 13. The fabric as in claim 10, wherein said auxetic property comprises a Poisson's ratio equal to zero.
Claim 14. The fabric as in claim 10, wherein said auxetic property comprises a negative Poisson's ratio.
Claim 15. A garment comprising a fabric having a knit structure that imparts an auxetic property to said fabric due to rotation of one or more portions of said knit structure.
Claim 16. The garment as in claim 15, wherein the garment comprises a garment selected from the group consisting of a brassiere, a panty, a camisole, a bathing suit, a pair of pantyhose, a leotard, a retention bandage, a support device, a compression bandage, and any combinations thereof.
Claim 17. The garment as in claim 15, wherein said knit structure imparts said auxetic property due to deformation of said one or more portions and/or due to translation of said one or more portions.
Claim 18. The garment as in claim 15, wherein said knit structure has a geometric shape selected from the group consisting of a re-entrant honeycomb, a star network, a re-entrant rhombic dodecahedron, a triangular lattice, rotating squares, rotating triangles, rotating tetrahedra, a chiral honeycomb, interlocked hexagons, interlocked quadrilaterals, interlocked triangles, and any combinations thereof.
Claim 19. The fabric as in claim 15, wherein said auxetic property comprises a Poisson's ratio of zero or less.
Claim 20. A garment comprising a fabric with a triangular lattice knit structure that imparts an auxetic property to the fabric.
Claim 21. The garment as in claim 20, wherein said knit structure comprises yarns made of a material selected from the group consisting of natural fibers, synthetic fibers, auxetic fibers, and any combinations thereof.
Claim 22. The garment as in claim 20, wherein the garment comprises a garment selected from the group consisting of a brassiere, a panty, a camisole, a bathing suit, a pair of pantyhose, a leotard, a retention bandage, a support device, a compression bandage, and any combinations thereof.
Claim 23. The garment as in claim 20, wherein said auxetic property is imparted due to rotation of one or more portions of said knit structure, and/or translation of said one or more portions, and/or deformation of said one or more portions.
Claim 24. The fabric as in claim 20, wherein said auxetic property comprises a Poisson's ratio of zero or less.
PCT/US2007/017278 2006-08-02 2007-08-02 Fabrics having knit structures exhibiting auxetic properties and garments formed thereby WO2008016690A2 (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010125397A1 (en) * 2009-05-01 2010-11-04 Global Composites Group Auxetic knitted fabric
CN102729948A (en) * 2012-07-17 2012-10-17 大连理工大学 Vehicle safety belt braid
CN104911804A (en) * 2015-07-06 2015-09-16 江南大学 Negative poisson's ratio two-dimensional warp knitting fabric and weaving method thereof
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Families Citing this family (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080185115A1 (en) * 2007-02-07 2008-08-07 Antony Morton Paper machine clothing with auxetic fibers and/or yarns
US8652602B1 (en) * 2007-02-28 2014-02-18 William Jacob Spenner Dolla Rotational expansion auxetic structures
GB2451357B (en) * 2008-09-04 2009-10-14 Global Composites Group Ltd Ceramic Armour
KR20120125263A (en) 2009-12-30 2012-11-14 쓰리엠 이노베이티브 프로퍼티즈 컴파니 Molded auxetic mesh
GB201019796D0 (en) * 2010-11-23 2011-01-05 Univ Exeter The Auxetic material articles
US10426226B2 (en) 2012-08-31 2019-10-01 Under Armour, Inc. Footwear upper with dynamic and lock-out regions
US9538798B2 (en) 2012-08-31 2017-01-10 Under Armour, Inc. Articles of apparel including auxetic materials
US11839253B2 (en) 2012-08-31 2023-12-12 Under Armour, Inc. Article of apparel including fabric having auxetic structure
US9936755B2 (en) 2012-08-31 2018-04-10 Under Armour, Inc. Articles of apparel with auxetic fabric
US9629397B2 (en) 2012-08-31 2017-04-25 Under Armour, Inc. Articles of apparel including auxetic materials
US9554624B2 (en) * 2013-09-18 2017-01-31 Nike, Inc. Footwear soles with auxetic material
US9554620B2 (en) 2013-09-18 2017-01-31 Nike, Inc. Auxetic soles with corresponding inner or outer liners
US9554622B2 (en) 2013-09-18 2017-01-31 Nike, Inc. Multi-component sole structure having an auxetic configuration
US9456656B2 (en) 2013-09-18 2016-10-04 Nike, Inc. Midsole component and outer sole members with auxetic structure
US9402439B2 (en) 2013-09-18 2016-08-02 Nike, Inc. Auxetic structures and footwear with soles having auxetic structures
US9549590B2 (en) 2013-09-18 2017-01-24 Nike, Inc. Auxetic structures and footwear with soles having auxetic structures
US9538811B2 (en) 2013-09-18 2017-01-10 Nike, Inc. Sole structure with holes arranged in auxetic configuration
USD777452S1 (en) 2014-01-17 2017-01-31 Under Armour, Inc. Textile substrate with overlay
USD774783S1 (en) 2014-01-29 2016-12-27 Under Armour, Inc. Elastic textile
US9872537B2 (en) 2014-04-08 2018-01-23 Nike, Inc. Components for articles of footwear including lightweight, selectively supported textile components
US9861162B2 (en) 2014-04-08 2018-01-09 Nike, Inc. Components for articles of footwear including lightweight, selectively supported textile components
US9474326B2 (en) 2014-07-11 2016-10-25 Nike, Inc. Footwear having auxetic structures with controlled properties
US9903054B2 (en) * 2014-08-27 2018-02-27 Nike, Inc. Knitted component having tensile strand for adjusting auxetic portion
US10064448B2 (en) 2014-08-27 2018-09-04 Nike, Inc. Auxetic sole with upper cabling
US9854869B2 (en) 2014-10-01 2018-01-02 Nike, Inc. Article of footwear with one or more auxetic bladders
US9681703B2 (en) 2014-12-09 2017-06-20 Nike, Inc. Footwear with flexible auxetic sole structure
US9775408B2 (en) 2014-12-09 2017-10-03 Nike, Inc. Footwear with auxetic ground engaging members
US9901135B2 (en) 2014-12-09 2018-02-27 Nike, Inc. Footwear with flexible auxetic ground engaging members
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WO2016144971A1 (en) * 2015-03-09 2016-09-15 Fritze Torsten A Composite product formed of a seamless continuous knit preform and method of making the same
US9730490B2 (en) 2015-08-04 2017-08-15 Nike, Inc. Upper for an article of footwear with auxetic configuration
US10070688B2 (en) 2015-08-14 2018-09-11 Nike, Inc. Sole structures with regionally applied auxetic openings and siping
US9668542B2 (en) 2015-08-14 2017-06-06 Nike, Inc. Sole structure including sipes
US9635903B2 (en) 2015-08-14 2017-05-02 Nike, Inc. Sole structure having auxetic structures and sipes
WO2017070662A1 (en) * 2015-10-23 2017-04-27 The University Of New Hampshire Three-dimensional structures having adjustable auxetic effects
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US10813463B2 (en) 2017-12-05 2020-10-27 Steelcase Inc. Compliant backrest
USD870479S1 (en) 2017-12-05 2019-12-24 Steelcase Inc. Chair
USD869889S1 (en) 2017-12-05 2019-12-17 Steelcase Inc. Chairback
USD869890S1 (en) 2017-12-05 2019-12-17 Steelcase Inc. Chairback
US11291305B2 (en) 2017-12-05 2022-04-05 Steelcase Inc. Compliant backrest
US11383486B2 (en) * 2018-08-07 2022-07-12 University Of New Hampshire Wavy network structures dispersed in a hard phase
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US10448679B1 (en) 2018-09-14 2019-10-22 The Gap, Inc. High impact and high support bras
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USD907383S1 (en) 2019-05-31 2021-01-12 Steelcase Inc. Chair with upholstered back
US11700890B2 (en) * 2019-10-04 2023-07-18 MINDD, Inc. Upper body shaper garment
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DE102020208218B4 (en) * 2020-07-01 2022-02-10 Adidas Ag Auxetic article
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3653233A (en) * 1968-12-05 1972-04-04 Titone Research & Dev Corp Machine knitting
US4668557A (en) * 1986-07-18 1987-05-26 The University Of Iowa Research Foundation Polyhedron cell structure and method of making same
US6477865B1 (en) * 1999-12-16 2002-11-12 Asahi Doken Kabushiki Kaisha Three-dimensional marquisette style knitted fabric
US6878320B1 (en) * 1999-03-06 2005-04-12 The University Of Bolton, Higher Education Corporation A Uk Corporation Auxetic materials

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1187158A (en) * 1915-02-18 1916-06-13 Simon Friedberger Twisted net fabric.
US2691286A (en) * 1953-08-31 1954-10-12 Gilbert N Cooper Warp-knitted fabric
SE392582B (en) * 1970-05-21 1977-04-04 Gore & Ass PROCEDURE FOR THE PREPARATION OF A POROST MATERIAL, BY EXPANDING AND STRETCHING A TETRAFLUORETENE POLYMER PREPARED IN AN PASTE-FORMING EXTENSION PROCEDURE
US4074543A (en) * 1976-10-26 1978-02-21 Allura Corporation Lace and a method for its manufacture
US5339657A (en) * 1992-09-01 1994-08-23 Mcmurray Fabrics, Inc. Net having different size openings and method of making
US5771716A (en) * 1995-09-18 1998-06-30 Schlussel; Edward Warp-knitted loop net fabric
JP2996633B2 (en) * 1997-09-02 2000-01-11 豊栄繊維株式会社 Seamless warp knitted fabric for clothing
US6434879B1 (en) * 1998-02-10 2002-08-20 Otter Ultra-Low-Drag, Ltd. Bi-directional, manufacturable, lift-generating mesh bar
CN1210451C (en) * 1998-10-14 2005-07-13 旭土建株式会社 3-D structure net and composite material using the net
ES2269069T3 (en) * 1999-06-08 2007-04-01 Ethicon, Inc. WOVEN SURGICAL MESH.
DE19957019C5 (en) * 1999-11-26 2009-04-02 Liba Maschinenfabrik Gmbh Method for producing a warp knitted fabric with large grid openings
US7247265B2 (en) * 2000-03-06 2007-07-24 Auxetic Technologies Ltd. Auxetic filamentary materials
US6540773B2 (en) * 2001-07-03 2003-04-01 Scimed Life Systems, Inc. Low profile, high stretch knit prosthetic device
JP3886944B2 (en) * 2003-07-15 2007-02-28 Ｙｋｋ株式会社 Braided surface fastener

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3653233A (en) * 1968-12-05 1972-04-04 Titone Research & Dev Corp Machine knitting
US4668557A (en) * 1986-07-18 1987-05-26 The University Of Iowa Research Foundation Polyhedron cell structure and method of making same
US6878320B1 (en) * 1999-03-06 2005-04-12 The University Of Bolton, Higher Education Corporation A Uk Corporation Auxetic materials
US6477865B1 (en) * 1999-12-16 2002-11-12 Asahi Doken Kabushiki Kaisha Three-dimensional marquisette style knitted fabric

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010125397A1 (en) * 2009-05-01 2010-11-04 Global Composites Group Auxetic knitted fabric
US9475257B2 (en) 2012-02-28 2016-10-25 The Hong Kong Research Institute Of Textiles And Apparel Limited Three dimensional negative poisson'S ratio spacer knitted fabric and method for making the same
CN102729948A (en) * 2012-07-17 2012-10-17 大连理工大学 Vehicle safety belt braid
CN104911804A (en) * 2015-07-06 2015-09-16 江南大学 Negative poisson's ratio two-dimensional warp knitting fabric and weaving method thereof
CN106012271A (en) * 2016-08-03 2016-10-12 江南大学 Production method for warp-knitted spacer fabric with negative Poisson ratio effects
CN109869431A (en) * 2019-03-25 2019-06-11 长沙理工大学 A kind of three-dimensional anti-impact material with negative poisson's ratio characteristic
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WO2022006920A1 (en) * 2020-07-09 2022-01-13 中山大学 Three-dimensional multi-cell structure with adjustable poisson's ratio and coefficient of thermal expansion

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