US20080011021A1 - 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 PDFInfo
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- US20080011021A1 US20080011021A1 US11/497,994 US49799406A US2008011021A1 US 20080011021 A1 US20080011021 A1 US 20080011021A1 US 49799406 A US49799406 A US 49799406A US 2008011021 A1 US2008011021 A1 US 2008011021A1
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- 239000004744 fabric Substances 0.000 title claims abstract description 81
- 230000001747 exhibiting effect Effects 0.000 title description 2
- 239000000463 material Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 8
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- 238000007906 compression Methods 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 5
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims description 4
- 238000003287 bathing Methods 0.000 claims description 4
- 239000012209 synthetic fiber Substances 0.000 claims description 4
- 229920002994 synthetic fiber Polymers 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000009940 knitting Methods 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 206010052428 Wound Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
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- 239000006260 foam Substances 0.000 description 1
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Images
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.
- apparel garments such as but not limited to, panties, brassieres, camisoles, bathing suits, pantyhose, leotards, and others have been proposed.
- medical garments such as but not limited to, retention bandages, support devices, and/or compression bandages have been proposed.
- apparel and/or medical garments are hereinafter individually and/or collectively referred to as “garments”.
- 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 6 A
- FIG. 7B illustrates a tessellating pattern of the repeat unit of 6 B
- 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 .
- 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 .
- 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.
- 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).
- 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 .
- 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 FIG. 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 videoextensometry.
- 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.
- ⁇ l is the strain
- l and l 0 are the length and original length, respectively, in the direction of interest.
- the Poisson's ratio v ij 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 ⁇ v ij , 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. Pat. 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-in 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
Description
- This application is a continuation-in-part of U.S. application Ser. No. 11/475,336, filed on Jun. 27, 2006, now pending.
- 1. Field of the Invention
- 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
- 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”.
- 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.
- 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.
- Accordingly, 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.
- It is an object of the present disclosure to provide fabrics having knit structures that exhibit auxetic properties.
- It is another object to provide an auxetic knit structure that can be produced on a warp knitting machine.
- 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.
- 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.
- 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.
- 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.
- 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.
-
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 ofFIG. 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 ofFIG. 5 in the relaxed state; -
FIG. 6B illustrates the approximate geometric structure of the single repeat unit ofFIG. 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 ofFIG. 4 ; and -
FIG. 9 is a graph plotting transverse strain data to longitudinal strain data of the fabric ofFIG. 4 . - Materials that exhibit positive Poisson's ratio properties, which are discussed in detail with respect to
FIGS. 1A and 2A , have been determined by the present disclosure, when used in a garment, to reduce the fit of the resultant garment. - As show in
FIG. 1A , 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 inFIG. 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. - 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 . - 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 inFIG. 1A . - 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 inFIG. 2A . - 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.
- 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. 2B , 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 Mechanism Geometric Structure Example Rotation of Re-entrant honeycomb Deforming by rib hinging sub-units Star network Deforming by rib hinging Re-entrant rhombic Deforming by rib hinging dodecahedron Triangular lattice Deforming by rib hinging Corner-sharing squares Rotating squares Corner-sharing Rotating triangles triangles Ccorner-sharing Rotating tetrahedra tetrahedra Deformation Re-entrant honeycomb Deforming by rib flexure of sub-units Star network Deforming by rib flexure Honeycomb Deforming by rib stretching Chiral honeycomb Deforming by rib flexure Corner-sharing Deforming by dilation polyhedra (e.g., squares, triangles, tetrahedra, etc) Triangular lattice Deforming by rib flexure and/or stretching Translation Interlocked hexagons Deforming by sliding of hexagons of sub-units with respect to one another Interlocked Deforming by sliding of quadrilaterals quadrilaterals with respect to one another Interlocked triangles Deforming by sliding of triangles with respect to one another - 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.
- 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 inFIG. 3A . Each wale is a column of loops or stitches running along the length (e.g., warp direction) of the knit fabric as shown inFIG. 3B . - 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). - 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.
- For purposes of clarity, only the rib hinging mechanism of
triangular lattice structure 14 is discussed in detail below with respect toFIGS. 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 aside 18, while external angle β is the angle between the centerline and anend 20. - 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 afirst direction 22 as shown inFIGS. 6B and 7B , the ends 20 oftriangular 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 asecond direction 24, where the second direction is about normal to thefirst direction 22. -
Triangular lattice structure 14 is illustrated inFIG. 7 in tessellated form, namely formed into a mosaic with a plurality of thetriangular lattice structures 14.Triangular lattice structure 14 inFIG. 7B having a deformed cell structure due to the application oftension 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 inFIG. 7A . Thus,triangular lattice structure 14 is auxetic when deformation is due to the rotation of theribs - In this illustrated embodiment,
triangular lattice structure 14 is oriented so thatcenterline 16 is approximately normal to the warp direction. - The auxetic properties of fabric 10 were characterized using combined mechanical testing and videoextensometry.
- 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. -
FIG. 8 shows the width and length videoextensometry data for the fabric ofFIG. 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. - The width and length data were converted to transverse and axial strains, respectively, using the definition of true strain given by:
-
- where εl is the strain, and l and l0 are the length and original length, respectively, in the direction of interest. The Poisson's ratio vij 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 −vij, 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 inFIG. 8 contain the derived strains for the average of all 10 transverse sections measured during the test. - Next, linear best fit lines were applied to the data set in
FIG. 9 , to result in a value of v12=−0.20. The data from the testing supports this finding, as the data showed that fabric 10 has v12=−0.22±0.03 and v21=−0.13±0.02. - 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.
- 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. - 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.
- 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. Pat. 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.
- 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-in 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.
- 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.
- 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.
- 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 (24)
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Application Number | Priority Date | Filing Date | Title |
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US11/497,994 US20080011021A1 (en) | 2006-06-27 | 2006-08-02 | Fabrics having knit structures exhibiting auxetic properties and garments formed thereby |
CA 2592853 CA2592853A1 (en) | 2006-06-27 | 2007-06-27 | Fabrics having knit structures exhibiting auxetic properties and garments formed thereby |
PCT/US2007/017278 WO2008016690A2 (en) | 2006-08-02 | 2007-08-02 | Fabrics having knit structures exhibiting auxetic properties and garments formed thereby |
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US47533606A | 2006-06-27 | 2006-06-27 | |
US11/497,994 US20080011021A1 (en) | 2006-06-27 | 2006-08-02 | Fabrics having knit structures exhibiting auxetic properties and garments formed thereby |
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US47533606A Continuation-In-Part | 2006-06-27 | 2006-06-27 |
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US20080011021A1 true US20080011021A1 (en) | 2008-01-17 |
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US11/497,994 Abandoned US20080011021A1 (en) | 2006-06-27 | 2006-08-02 | Fabrics having knit structures exhibiting auxetic properties and garments formed thereby |
Country Status (3)
Country | Link |
---|---|
US (1) | US20080011021A1 (en) |
CA (1) | CA2592853A1 (en) |
WO (1) | WO2008016690A2 (en) |
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US20160058098A1 (en) * | 2014-08-27 | 2016-03-03 | Nike, Inc. | Knitted component having tensile strand for adjusting auxetic portion |
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US20080185115A1 (en) * | 2007-02-07 | 2008-08-07 | Antony Morton | Paper machine clothing with auxetic fibers and/or yarns |
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CN110638191A (en) * | 2019-10-30 | 2020-01-03 | 南京工业大学 | Backpack with negative Poisson ratio effect and design method thereof |
US20220002917A1 (en) * | 2020-07-01 | 2022-01-06 | Adidas Ag | Auxetic article |
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Also Published As
Publication number | Publication date |
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CA2592853A1 (en) | 2007-12-27 |
WO2008016690A3 (en) | 2008-10-23 |
WO2008016690A2 (en) | 2008-02-07 |
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