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  Stretchable composite fabric and clothing product therefromUSPTO Application #: 20070004303Title: Stretchable composite fabric and clothing product therefrom Abstract: A stretchable composite fabric appropriate to sports wear and under wear is a woven or knitted fabric including a composite yarns (A) formed from stretchable yarns (1) having a self-elongation of 5% or more upon absorbing water and an elongation at break of 200% or more and non-stretchable yarns (2) having a self-elongation less than 5% upon absorbing water, and yarns (B) including stretchable yarns (3) having a self-elongation less than 5% upon absorbing water and an elongation at break of 30% or more, wherein the yarns (1) and (2) in a sample taken from the composite fabric respectively have a length L1 and a length L2, the ratio L1/L2 is 0.9 or less, and the yarns (1) can self-elongate upon absorbing water and shrink upon drying. (end of abstract) Agent: Sughrue Mion, PLLC - Washington, DC, US Inventors: Kengo Tanaka, Kenji Iwashita USPTO Applicaton #: 20070004303 - Class: 442182000 (USPTO) Related Patent Categories: Fabric (woven, Knitted, Or Nonwoven Textile Or Cloth, Etc.), Woven Fabric (i.e., Woven Strand Or Strip Material), Woven Fabric Has An Elastic Quality The Patent Description & Claims data below is from USPTO Patent Application 20070004303. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a stretchable composite fabric and cloth products thereof. More particularly, the present invention relates to a stretchable composite fabric which is a woven or knitted fabric comprising a stretchable and high water-absorbent and self-elongative yarn (1), a non-stretchable, low water-absorbent and low self-elongative yarn (2) and a stretchable, low water-absorbent and low self-elongative yarn (3), and capable of, when wetted with water, generating a rough (or rugged or concave and convex) pattern due to difference in water-absorption and self-elongation among the yarns from which the fabric is constituted, and removing, when dried, the rugged pattern from the fabric, and cloth products thereof. TECHNICAL BACKGROUND [0002] It is known that various proposals have been made to utilize stretchable woven or knitted fabrics in uses of sports wear and under wear, as described in, for example, Japanese Unexamined Patent Publication No. 3-174043 (Patent Reference 1). [0003] When the stretchable woven or knitted fabrics comprising synthetic fibers and/or national fibers are used in the use of clothes, for example, the sports wear and under wear, however, a problem that when sweated, from the skin, the cloth adheres to the skin so as to create unpleasantness, occurred. To solve the problem, Japanese Unexamined Patent Publication No. 2003-147657 (Patent Reference 2) provided a woven fabric having a double ply weave structure and a rough (or rugged or concave and convex) pattern formed on the back surface of the fabric. In this case, however, as the woven fabric has the rough (or rugged or concave and convex) pattern formed on the surface, a cloth prepared from the woven fabric is provided with unnecessary rugged pattern on the cloth surface in usual condition (non-wetted (non-sweated) condition), and thus has an undesired appearance. [0004] Also, for example, Japanese Unexamined Patent Publication No. 3-213518 (Patent Reference 3) and No. 10-77544 (Patent Reference 4) provided woven fabrics capable of self-controlling the air permeability thereof. The cloth prepared from this woven fabric can always provide good comfort by such a mechanism that when sweated and the temperature of the inside of the cloth increases, the air permeability of the woven fabric from which the cloth is formed increases so that moisture stored in the cloth is discharged to the outside of the cloth, and when the sweat stops, the cloth is dried and the temperature of the inside of the cloth decreases, the air permeability of the woven fabric from which the cloth is formed decreases so that the warmth-keeping property of the cloth increases. [0005] Further, Japanese Unexamined Patent Publication No. 2002-266249 (Patent Reference 5) provided a double ply-structured woven or knitted fabric containing a water-absorbing agent. [0006] In the above-mentioned conventional woven or knitted fabrics for clothes, however, the problem that when sweated, the cloth creates an unpleasantness, has not yet fully solved. [0007] [Patent Reference 1] JP-3-174043-A [0008] [Patent Reference 2] JP-2003-147657-A [0009] [Patent Reference 3] JP-3-213518-A [0010] [Patent Reference 4] JP-10-77544-A [0011] [Patent Reference 5] JP-2002-266249-A SUMMARY OF THE INVENTION [0012] An object of the present invention is to provide a stretchable composite fabric comprising a yarn capable of self-elongating upon wetting with and absorbing water and shrinking upon drying and exhibiting, as a whole, a stretchability, and a cloth product thereof. [0013] The above-mentioned object can be attained by the stretchable composite fabric of the present invention. [0014] The stretchable composite fabric of the present invention is a woven or knitted fabric comprising at least three types of yarns (1), (2), and (3) different from each other, wherein [0015] the yarn (1) is a stretchable, high water-absorbent and high self-elongative yarn, comprising stretchable fibers having relatively high self-elongation upon absorbing water, and an elongation at break of 200% or more; [0016] the yarn (2) is a non-stretchable, low water-absorbent and low self-elongative yarn comprising substantially non-stretchable fibers having relatively low self-elongation upon absorbing water; [0017] the yarn (3) is a stretchable, low water-absorbent and low self-elongative yarn, comprising stretchable fibers having a relatively low self-elongation upon absorbing water, and an elongation at break of 30% or more; [0018] the yarn (1) has a self-elongation of 5% or more upon absorbing water and the yarn (2) and (3) have an self-elongation less than 5% upon absorbing water, determined in such a manner that each type of yarn selected from the yarns (1), (2) and (3) is wound around a hank frame having a frame girth of 1.125 m under a load of 0.88 mN/d tex, to provide a hank with a winding number of 10, the hank yarn is removed from the hank frame and left to stand in the air atmosphere having a temperature of 20.degree. C. and a relative humidity of 65% for 24 hours to condition the hank yarn, the resultant dried hank yarn is subjected to a measurement of the dry length (Ld, mm) thereof under a load of 0.0080 mN/d tex, immersed in water at a water temperature of 20.degree. C. for 5 minutes, and then taken up from water, the resultant water-wetted hank yarn is subjected to a measurement of the wet length (LW, mm) thereof under a load of 0.0088 mN/d tex, and the self-elongation of the yarn is calculated in accordance with the following equation:Self elongation (%) of yarn upon absorbing water=[(Lw-Ld)/(Ld)].times.100; [0019] from the yarn (1) and the yarn (2), a stretchable, water-absorbent, and self-elongative composite yarn (A) is formed, and the yarn (3) is contained in a stretchable, non-water-absorbent and non-self-elongative yarn (B) having substantially no self elongation; and [0020] the woven or knitted fabric has a ratio L1/L2 of 0.9 or less, determined in such a manner that the woven or knitted fabric is subjected to a dimension stabilization in the air atmosphere having a temperature of 20.degree. C. and a relative humidity of 65%; then from the dimension-stabilized woven or knitted fabric, a specimen of the composite yarn (A) having a length of 30 cm is picked up; and average lengthes L1 and L2 of the yarns (1) and (2) contained in the specimen of the composite yarn (A) are measured under a load of 0.0088 mN/d tex, then the ratio of L1 to L2 is calculated. [0021] The composite fabric of the present invention preferably has a woven fabric structure, and in the warp yarn group and/or weft yarn group of the woven fabric structure, the stretchable, water-absorbent, and self-elongative composite yarn (A) and the stretchable, non-water absorbent and non-self-elongative yarn (B) are alternately arranged with every one yarn or every two or more yarns. [0022] In the composite fabric of the present invention, preferably the yarns of one group of the warp and weft yarn groups are formed from the composite yarn (A) and the yarn (B), and the yarns of the other group are formed from at least one type of yarns different from the composite yarn (A) and the yarn (B). [0023] In the composite fabric of the present invention, the different yarn, from the composite yarn (A) and the yarn (B), is preferably selected from yarns formed from a plurality of individual fibers having a flat cross-sectional profile and yarns formed from a plurality of individual fine fibers having a thickness of 1.5 d tex or less. [0024] The composite fabric of the present invention preferably has a multi-ply structure having two or more plies, in which the multi-ply structure at least one ply comprises the composite yarn (A) in a content of 20% by mass or more, based on the total mass of the ply and another at least one ply comprises the yarn (B) in a content of 20% by mass or more, based on the total mass of the another ply. [0025] In the composite fabric of the present invention, preferably, the fibers from which the stretchable, high water-absorbent and self-elongative yarn (1) contained in the composite yarn (A) is constituted, are selected from polyetherester fibers formed from polyetherester elastomers comprising hard segments formed from polybutylene terephthalate blocks and soft segments formed from polyoxyethyleneglycol blocks. Continue reading... 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