Multi-layered fabrics and clothing

Abstract

To provide a woven fabric which has a high heat-retaining property, always gives good air-permeability in any condition, and keeps high comfortableness in clothes regardless of the presence or absence of perspiration.SOLUTION: A multilayer-structured woven fabric includes a crimpable fiber in at least a part of an outer layer 1 constituting one surface of the multilayer-structured woven fabric, and the number of crossing points on a surface of the outer layer 1 is smaller than the number of crossing points on a surface of an outer layer 2 constituting a surface opposite to the surface of the outer layer 1. At least a part of the outer layer 2 has holes in a thickness direction. An area of one hole is 1.0×10-8 m2 per hole or more and 5.0×10-7 m2 per hole or less, and the number of holes per 1 cm2 of the surface of the outer layer 2 is 4 holes / cm2 or more, and an area ratio of the holes in the surface of the outer layer 2 is 0.10% or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to multi-layer fabrics and garments. [Background technology]

[0002] In the past, in the development of heat-retaining materials, methods such as forming an air layer between the skin surface and the outside air, using heat-generating materials such as acrylic fibers or cupra fibers, and reducing breathability have been considered.

[0003] For example, a technology has been disclosed that increases the cover factor of the outer layer (the outer air side) and decreases the cover factor of the inner layer (the skin side), thereby achieving wind resistance without compromising texture and also achieving heat retention (see, for example, Patent Document 1).

[0004] Furthermore, a technology has been disclosed in which the shape of the thread changes when sweating, improving breathability, and when there is no sweating, the breathability is kept lower than when sweating, maintaining heat retention (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-162169 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-161237 Summary of the Invention [Problem to be solved by the invention]

[0006] When the cover factor is adjusted to reduce breathability and provide wind resistance as in Patent Document 1, there is a problem that sweating causes the inside of the clothing to become stuffy, reducing comfort.

[0007] Furthermore, in the technology disclosed in Patent Document 2, functionality is exerted by moisture such as sweating, so the effect is not exerted efficiently at a humidity level, and comfort may be impaired depending on the amount of sweating.

[0008] Thus, there has been no material that aims to achieve both heat retention and suppression of stuffiness. An object of the present invention is to provide a multilayer structured fabric and clothing that have better heat retention than conventional fabrics, yet also have excellent breathability, reduce stuffiness, and are highly comfortable. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention has the following configuration. (1) At least a portion of outer layer 1 constituting one surface of a multilayer structure woven fabric contains crimped fibers, the number of crossing points on the surface of outer layer 1 is fewer than the number of crossing points on the surface of outer layer 2 constituting the surface opposite to outer layer 1, and at least a portion of outer layer 2 has holes in the thickness direction, and the area per hole is 1.0 × 10 -8 m 2 / pcs or more, 5.0×10 -7 m 2 / piece or less, and the outer layer 2 surface 1 cm 2 The number of holes per cm is 4 2 The multilayer structure woven fabric has the above structure, and the area ratio of the holes on the surface of the outer layer 2 is 0.10% or more. (2) The multilayer structure woven fabric according to (1), wherein 80% or more of the number of the holes are blind holes. (3) The multilayer woven fabric according to (1) or (2), wherein the crimpable fibers have a single yarn fineness of 1.5 dtex or less. (4) The multilayer woven fabric according to any one of (1) to (3), wherein the crimpable fibers are eccentric core-sheath type composite synthetic fibers. (5) Bulkiness according to JIS L 1096 (2010) is 3.00 cm 3 The multilayer structure woven fabric according to any one of (1) to (4), wherein the coefficient of friction is 1 / g or more. (6) Air permeability of 15.0 cc / cm according to JIS L 1096 (2010) method A (Fragile method) 2 ·Sec or more, 100.0cc / cm2 The multilayer structure woven fabric according to any one of (1) to (5), wherein the time required for the multilayer structure woven fabric is 1 / 2 sec or less. (7) Clothing comprising at least a part of the multilayer structure fabric according to any one of (1) to (6). [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a multilayered fabric and clothing that are warm, less stuffy, and comfortable, and that has both higher heat retention and breathability than conventional fabrics. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing an example of the surface of the outer layer 1 in the multi-layer structure fabric of the present invention. [Figure 2A] FIG. 2A is a schematic diagram showing an example of the surface corresponding to the surface of the outer layer 2 of a fabric preferably used in producing the multi-layer structure fabric of the present invention. [Figure 2B] FIG. 2B is a schematic diagram showing an example of the surface of the outer layer 2 in the multi-structure woven fabric of the present invention. [Figure 3] FIG. 3 is a schematic diagram showing an example of the cross-sectional shape of a side-by-side type conjugated synthetic fiber. [Figure 4] FIG. 4 is a schematic diagram showing an example of the cross-sectional shape of an eccentric sheath-core composite synthetic fiber, illustrating the position of the center of gravity in the fiber cross section. DETAILED DESCRIPTION OF THE INVENTION

[0012] The multilayer structure woven fabric of the present invention is a woven fabric having a structure with two or more layers within a single piece of fabric. The multilayer structure woven fabric is not particularly limited as long as it has a structure with multiple layers, and examples include various double and multiple weaves such as warp double weaves and weft double weaves, as well as modified weaves thereof. Any structure can be selected for outer layer 1 constituting one side, outer layer 2 constituting the side opposite outer layer 1, and any other layers contained inside.

[0013] The multilayer structure woven fabric of the present invention contains crimpable fibers in at least a portion of outer layer 1 constituting one side, and the number of intersection points between warp and weft yarns on the surface of outer layer 1 is fewer than the number of intersection points on the surface of outer layer 2 opposite outer layer 1. In the present invention, the surface of outer layer 1 refers to the surface of the outer surface of the multilayer structure woven fabric that is constituted by outer layer 1. Similarly, the surface of outer layer 2 refers to the surface of the outer surface of the multilayer structure woven fabric that is constituted by outer layer 2. It is preferable that crimpable fibers are also contained in at least a portion of outer layer 2. The inclusion of crimpable fibers increases bulkiness and makes the warmth retention feel more effective.

[0014] In the present invention, the crossing points on the surfaces of outer layer 1 and outer layer 2 refer to points where warp and weft threads cross each other when viewed from the outer surface of outer layer 1 and outer layer 2, respectively, and are points where one thread is above the other thread that intersects at right angles. For example, they are points where a weft thread is raised above a warp thread, or a warp thread is raised above a weft thread, and overlaps with the warp thread. Using FIG. 1 as an example, there is one crossing point (3) where a weft thread (2) is raised above a warp thread (1) on the outer surface. There are also two crossing points (4) where a warp thread (1) is raised above a weft thread on the outer surface. Here, a point where a weft thread (2) is continuously raised above two warp threads, such as crossing point (3), is counted as one point. Note that even if a point overlaps with another warp thread, if there are no perpendicular threads before or after it (or to the left or right), it is not counted as a crossing point. In the case of Figure 1, the intersection point (3) is counted as one point, and the intersection point (4) is counted as two points.

[0015] In the outer layer (outer layer 1) containing crimpable fibers, the more crossing points the crimpable fibers have, the more easily they are restrained during shrinkage, such as heat treatment, which inhibits the onset of crimp and reduces the amount of crimp. In other words, the fewer crossing points there are, the more the crimping of the crimpable fibers is promoted, increasing the amount of crimp, resulting in a multilayered woven fabric with high thermal insulation. For example, using Figure 1, which shows an example of the surface of outer layer 1, and Figure 2B, which shows an example of the surface of outer layer 2, it can be seen that the crossing points shown in Figure 1 are 2 for the 2nd, 6th, and 10th weft yarns from the top, and 1 for the others, and 3 for the 4th and 8th warp yarns from the left, and 2 for the others, for a total of 33, while the weft crossing points shown in Figure 2B are 50. Since the number of crossing points on the surface of outer layer 1 is smaller than that on the surface of outer layer 2, the crimpable fibers in outer layer 1 are more likely to develop crimp and the crimping effect is greater, resulting in a high heat retention effect. Therefore, it is preferable that the crimpable fibers are contained in at least the warp or weft yarn that has fewer crossing points. Weft or warp yarns that are perpendicular to the inside of the protruding warp or weft yarns are less likely to restrain the outer warp or weft yarns and less likely to inhibit the development of crimp in the crimpable fibers during heat treatment. The number of crossing points described above is compared for the same area on the outer surface of outer layer 1 and outer layer 2.

[0016] As described above, in the multilayer woven fabric of the present invention, any desired weave can be selected for outer layer 1 and the opposite outer layer 2. By selecting this weave, it is possible to control the intersection points of each layer.

[0017] In the present invention, the ratio of warp crossing points (number of crossing points in outer layer 1 / number of crossing points in outer layer 2) is preferably 0.1 to 0.9, and more preferably 0.1 to 0.8. By setting the ratio of warp crossing points to 0.9 or less, the crimping of the crimpable fibers in outer layer 1 is further promoted, resulting in a multilayer structure woven fabric with high heat retention. On the other hand, by setting the ratio of crossing points to 0.1 or more, snags, pilling, and the like that accompany a decrease in crossing points can be suppressed.

[0018] In the multilayer woven fabric of the present invention, for example, when crimpable fibers are used predominantly as warp yarns in outer layer 1 and fibers other than crimpable fibers are used in addition to the warp yarns of outer layer 1 for the purposes of patterning or texture adjustment, a warp double weave is preferably used in which the number of crossing points where the warp yarns are above the weft yarns in outer layer 1 is fewer than the number of crossing points where the warp yarns are above the weft yarns in outer layer 2. By using crimpable fibers in the warp yarns constituting outer layer 1 and other fibers in the warp yarns constituting outer layer 2, the crimpable fibers are unevenly distributed in outer layer 1, thereby enhancing the heat retention effect. Furthermore, for example, when crimpable fibers are used predominantly as weft yarns in outer layer 1 and fibers other than crimpable fibers are used in addition to the weft yarns of outer layer 1 for the purposes of patterning or texture adjustment, a weft double weave is preferably used in which the number of crossing points where the weft yarns are above the warp yarns in outer layer 1 is fewer than the number of crossing points where the weft yarns of outer layer 2 are above the warp yarns. By using crimped fibers for the wefts constituting outer layer 1 and other fibers for the wefts constituting outer layer 2, the crimped fibers are unevenly distributed in outer layer 1, enhancing the heat retention effect.

[0019] In the present invention, the crimpable fiber is preferably in the form of a multifilament. There are no particular limitations on the type of fiber as long as it has crimps, and it may be a fiber whose cross section is made of one type of polymer, or a composite synthetic fiber made of two or more types of polymers. In the present invention, it is preferable that the crimpable fiber is a composite synthetic fiber, as this facilitates crimping and improves bulkiness and thus heat retention.

[0020] Here, a fiber-forming thermoplastic polymer is preferably used as the polymer. Suitable polymers for achieving the object of the present invention include polyalkylene terephthalates (polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polytrimethylene terephthalate, etc.), polyesters such as polylactic acid, polyamides, thermoplastic polyurethanes, polyphenylene sulfide, and polyolefins (polyethylene, polypropylene, etc.).

[0021] When two types of polymers are used, assuming that the two types of polymers are component A and component B, suitable combinations in view of the object of the present invention include combinations of polymers that cause a difference in shrinkage when subjected to heat treatment or the like to induce crimp, and combinations of polymers that differ in molecular weight and / or composition to the extent that the difference in melt viscosity between the combined polymers is 10 Pa s or more. In general, polymers with higher melt viscosity and higher molecular weight tend to exhibit higher shrinkage when heated under conditions that induce crimp.

[0022] When the above-mentioned components A and B are combined to have different molecular weights, the molecular weights of the polymers used, such as the preferred polymers exemplified above, can be changed to, for example, use a high-molecular-weight polymer for component A and a low-molecular-weight polymer for component B. When components A and B are combined to have different compositions, one component can be a homopolymer and the other component can be a copolymer.

[0023] Furthermore, with regard to combinations of different polymer compositions, for example, various combinations such as polybutylene terephthalate / polyethylene terephthalate, polytrimethylene terephthalate / polyethylene terephthalate, thermoplastic polyurethane / polyethylene terephthalate, and polytrimethylene terephthalate / polybutylene terephthalate in component A / component B can be mentioned. In these combinations, differential shrinkage occurs upon heat treatment, and a fine crimped form can be obtained.

[0024] Among the above polymers, polyester, polyamide, polypropylene, etc. are particularly preferred, and polyester is more preferred among them because it also has mechanical properties, etc. Preferred examples of polyester include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, copolymers thereof with a dicarboxylic acid component, a diol component, or an oxycarboxylic acid component, and blends of these polyesters.

[0025] These polymers may contain inorganic fine particles, organic compounds, and carbon black as matting agents such as titanium oxide, flame retardants, lubricants, antioxidants, coloring pigments, etc., as needed, within the scope of the present invention.

[0026] In the present invention, the crimpable fiber is preferably a false-twisted yarn. Using a false-twisted yarn can prevent the crimp phases between the single yarns from becoming aligned, thereby allowing for a finer crimp morphology. As a result, heat retention is improved, and breathability can be controlled by passing through the gaps between the single yarns. The false-twisting method may be any conventionally known method, such as the commonly used pin type, friction disk type, nip belt type, or air twist type. Single-stage heater false-twisting or double-stage heater false-twisting can be appropriately selected. For example, when single-stage heater false-twisting is performed, emphasis is placed on the stretchability of the woven fabric, while double-stage heater false-twisting is preferably used when dimensional changes and abnormal shrinkage during the processing step are to be suppressed.

[0027] In the present invention, when the crimpable fiber is used as a conjugated synthetic fiber, the conjugated form of the conjugated synthetic fiber is not particularly limited, but a side-by-side type or an eccentric sheath-core type can be exemplified as a preferred example. Specifically, it is preferable for the cross section to be the side-by-side type exemplified in Figure 3 or the eccentric sheath-core type exemplified in Figure 4. Figure 3 is an example of the cross section of a side-by-side type conjugated synthetic fiber, showing a state in which component A (10) and component B (11) are conjugated side-by-side. Figure 4 is an example of the cross section of an eccentric sheath-core type conjugated synthetic fiber, showing the fiber cross section for explaining the position of the center of gravity in the fiber cross section.

[0028] Here, "eccentricity" refers to the fact that the center of gravity of the area of ​​the core component in the cross section of the composite synthetic fiber is different from the center of gravity of the area of ​​the entire composite synthetic fiber. Specifically, referring to Figure 4, the horizontal hatching represents component B (11), and the 45° hatching (diagonal lines rising to the right) represents component A (10). The center of gravity (a) of component A in the cross section of the composite synthetic fiber is shown to be different from the center of gravity (C) of the cross section of the composite synthetic fiber. A combination of polyesters as the core component (component A) and sheath component (component B) is preferred because it has good crimp and mechanical properties and is excellent in dimensional stability against changes in humidity and temperature. Polybutylene terephthalate (PBT) is particularly preferred as the core component because it has good crimp and forms a bulkier insulating layer, resulting in a woven fabric with excellent heat retention. Polytrimethylene terephthalate (PPT) can also be used as the core component because it has good crimp and forms a bulkier insulating layer, resulting in a woven fabric with excellent heat retention.

[0029] In the present invention, the crimpable fiber is preferably an eccentric core-sheath composite synthetic fiber, because it continues to bend in the fiber axis direction, forming a three-dimensional spiral structure and resulting in a good crimpable fiber. Here, the greater the distance between the center of gravity (a) and the center of gravity (c), the finer the crimp, resulting in good heat retention and stretch performance. This is also highly desirable because it prevents polymer peeling between the two components, thereby maintaining crimpability and heat retention. Furthermore, by completely covering the core component with the sheath component, whitening and fuzzing, even when the woven fabric is subjected to friction or impact, can be prevented, thereby maintaining the quality of the woven fabric. In addition, this is also desirable from the viewpoint of the spinning operability of the fine-fiber single yarn.

[0030] In the present invention, when the crimpable fiber is a side-by-side type composite synthetic fiber, the composite area ratio of component A to component B in the fiber cross section is preferably in the range of 70:30 to 30:70, and more preferably in the range of 65:35 to 35:65, from the viewpoint of crimp expression.

[0031] In the present invention, when the crimpable fiber is an eccentric sheath-core composite synthetic fiber, the composite area ratio of the core component to the sheath component in the fiber cross section is preferably in the range of 70:30 to 30:70, more preferably 65:35 to 45:55, in order to further improve the physical properties of the eccentric sheath-core composite synthetic fiber. Furthermore, from the viewpoint of crimp development, it is preferable to use a high-shrinkage component or a high-molecular-weight polymer as the core component and increase its ratio, as this makes it easier to realize a fine spiral structure.

[0032] In the present invention, it is possible to use a crimped fiber and another fiber, or two or more crimped fibers together, by doubling or mixing them. In the case of mixing, interlaced mixed fibers, taslan mixed fibers, false twisted mixed fibers, two or more mixed fibers, etc. can be appropriately selected depending on the purpose.

[0033] In the multilayer woven fabric of the present invention, it is preferable that the outer layer 1 contains crimpable fibers at 50% or more by area from the viewpoint of heat retention, and more preferably 70% or more by area. The upper limit is preferably 100% by area, as this provides the best heat retention. Since the outer layer 1 has a structure that promotes the crimping of the crimpable fibers, the more crimpable fibers it contains, the greater the effect of improving heat retention, which is preferable. Here, "containing 50% or more by area" means that when the fibers forming the outer layer are observed from their outer surface, the area ratio occupied by crimpable fibers is 50% or more. The measurement method will be described in detail in the Examples.

[0034] The single yarn fineness of the crimpable fiber in the present invention is preferably 1.5 dtex or less, and more preferably 1.0 dtex or less. By using a crimpable fiber with a single yarn fineness of 1.5 dtex or less, a finer spiral structure can be achieved. In other words, the voids between the single yarns become finer, and each void functions as an insulating layer, resulting in a material with high heat retention. The lower limit is preferably 0.1 dtex or more in order to suppress deterioration in physical properties such as snags and pilling that accompany finer single yarns. The total fineness of the crimpable fiber is preferably in the range of 10 dtex to 600 dtex. The preferred range for clothing is 10 dtex to 300 dtex.

[0035] Next, an example of a preferred method for producing the crimped fiber of the present invention will be described, but the method is not particularly limited to this.

[0036] First, the spinning temperature is preferably set to a temperature higher than the polymer melting point by +20 to +50°C. Setting the temperature higher than the polymer melting point by +20°C or more can prevent the polymer from solidifying and clogging the spinning machine piping, and setting the higher temperature to +50°C or less can prevent excessive thermal degradation of the polymer, which is preferable.

[0037] Crimped fibers are preferably obtained by melt spinning, and the spinneret may have any commonly used internal structure as long as it allows for spinning with stable quality and operation. In particular, distributor plate type spinnerets as exemplified in JP-A Nos. 2011-174215, 2011-208313, and 2012-136804 can be suitably used to form fibers with a desired cross-sectional shape.

[0038] As mentioned above, the crimpable fiber preferably has a fine single filament fineness of 1.5 dtex or less. However, it is also possible to produce the crimpable fiber by producing a sea-island composite fiber in which the easily soluble component constitutes the sea and the crimpable fiber constitutes the islands, and then eluting and removing the sea component. By covering the bimetallic structure composite fiber with the sea-island eluted component, a fiber with a fine single filament fineness can be obtained while improving spinnability. On the other hand, the direct spinning method is preferred because it simplifies production by eliminating the need for an elution processing step, which tends to reduce the production cost of woven fabrics. Furthermore, since the bimetallic composite fiber obtained by sea-island elution does not require heat treatment before elution of the fabric, it is likely to have a greater crimp development effect. A greater crimp development effect is preferred because it improves the heat retention of the fabric.

[0039] The eccentric sheath-core composite synthetic fiber preferably used in the present invention is preferred in that one component is completely covered by the other component, thereby suppressing delayed shrinkage and contributing to the production of a uniform woven fabric.Furthermore, it is preferred in that it allows the use of high-molecular-weight polymers and highly elastic polymers, which have not been possible to use as high-shrinkage components until now.

[0040] In the present invention, when producing a side-by-side or eccentric core-sheath type composite synthetic fiber, any process can be used, including a two-step process in which the extruded polymer is once wound as an undrawn yarn and then drawn, a direct spinning-drawing process in which the spinning and drawing steps are carried out continuously, and a high-speed spinning process. Furthermore, the range of the spinning speed in the high-speed spinning process is not particularly limited, and a step in which the polymer is wound as a semi-drawn yarn and then drawn may also be used. Furthermore, yarn processing such as false twisting can be carried out as needed.

[0041] When spinning crimpable fibers using a two-step method, any conventional spinning method can be used, including hot roll-hot roll spinning and spinning using hot pins. Depending on the application, spinning may also be performed while entangling or false twisting is performed. To prevent compound defects such as fuzzing and separation of the two components, spinning is preferably performed so that the residual elongation of the stretched yarn is 25 to 50%. Heat-setting the stretched fiber and then cooling it to below the glass transition temperature while maintaining tension to fix the molecular chain structure increases the shrinkage stress, which is effective in improving the texture of the woven fabric. Specifically, passing the fiber through a chill roll while it is stretched to about 0.3 to 3.0% is preferable, as it achieves high shrinkage stress. Furthermore, because spinning and winding are performed while stress strain is applied to the shrinking polymer (e.g., component A) to induce crimp, delayed shrinkage may occur due to viscoelastic behavior before fabric formation after winding, potentially resulting in streaks in the woven fabric.

[0042] The multilayered woven fabric of the present invention may contain fibers other than the crimped fibers. Specifically, these include natural fibers such as cotton, silk, and animal fibers (wool); synthetic fibers such as polyester, polyamide, and polyurethane; semi-synthetic fibers such as acetate; and regenerated cellulose fibers. Among these, polyester and polyamide synthetic fibers are preferred from the viewpoint of quick-drying properties.

[0043] The fibers other than the crimpable fibers may be in the form of spun yarn or multifilament yarn, but multifilament yarn is preferred in terms of suppressing fiber dust shedding. When the fibers other than the crimpable fibers are spun yarn, the cotton count can be set to a range of 10 or more. Furthermore, the preferred range for clothing is 20 or more and 170 or less. When the fibers other than the crimpable fibers are multifilament yarn, the total fineness is preferably in the range of 10 dtex or more and 600 dtex or less. Furthermore, the preferred range for clothing is 10 dtex or more and 300 dtex or less.

[0044] The multilayer structure fabric of the present invention has holes in the thickness direction in at least a part of the outer layer 2, and the area per hole is 1.0 × 10 from the viewpoint of breathability. -8 m2 / or more. Preferably, 3.0 × 10 -8 m 2 / piece or more. Also, from the viewpoint of heat retention, -7 m 2 / piece or less, preferably 3.0 × 10 -7 m 2 / pieces or less, more preferably 1.0 × 10 -7 m 2 / or less.

[0045] In addition, the surface of the outer layer 2 in the multilayer structure fabric is 1 cm 2 The number of holes per cm is 4 2 More than 8 pieces / cm 2 More than 10 / cm, preferably 10 / cm 2 The upper limit is not particularly limited, but from the viewpoint of heat retention, it is set to 50 pieces / cm 2 Preferably, it is 40 pieces / cm or less. 2 More preferably, it is 30 cells / cm or less. 2 It is even more preferable that:

[0046] Furthermore, the area ratio of pores on the surface of the outer layer 2 is 0.10% or more, preferably 0.20% or more, more preferably 0.30% or more. There is no particular upper limit, but from the viewpoint of heat retention, it is preferably 3.0% or less.

[0047] The multilayer structure fabric of the present invention has a hole area of ​​1.0 × 10 -8 m 2 / piece, less than 1cm 2 4 holes per cm 2 If the hole area ratio is less than 0.10%, the breathability will be low and stuffiness and overshooting will not be prevented. -7 m 2 If the number of holes exceeds 1 / 10, the breathability increases and high heat retention cannot be achieved. In the present invention, in order to achieve both heat retention and suppression of stuffiness, it is necessary to control the number of holes within the above-mentioned specific range. The measurement methods for the area and number of holes will be described in detail in the Examples.

[0048] In the multilayer structured fabric of the present invention, as described above, although the outer layer 2 has holes in at least a part in the thickness direction, other layers including the outer layer 1 may also have holes in at least a part in the thickness direction. In that case, preferably, by making 80% or more of the number of holes non-through holes, it is possible to achieve higher heat retention while maintaining a certain air permeability. The non-through holes referred to in the present invention mean holes that do not penetrate linearly in the thickness direction from one surface to the other surface of the multilayer structured fabric of the present invention. By making non-through holes, the stuffy feeling is suppressed by a certain air permeability due to the voids of the crimped fibers in the outer layer 1, and since many heat insulating layers are formed because they are non-through holes, the heat retention can be increased. Incidentally, the number of holes (H1) per 1 cm of the outer surface in the outer layer 1 2 is less than the number of holes (H2) per 1 cm of the outer surface in the corresponding outer layer 2 (H1 < H2), which is preferable from the viewpoint of heat retention, and it is more preferable that H1 is 0 holes / cm 2 2 2 is more preferable.

[0049] The method for manufacturing holes in the multilayer structured fabric of the present invention is not particularly limited, but since it is preferably a non-through hole as described above, it is preferably obtained by dissolution rather than punching with a needle or the like. Specifically, it is preferable to dissolve and / or decompose a part of the warp and a part of the weft from a fabric made of fibers that dissolve and / or decompose in water and / or the same specific solvent in water and / or the specific solvent, and form holes corresponding to the fineness at the orthogonal part of the fibers. Explaining with reference to the drawings, by dissolving and / or decomposing the fibers (7) that dissolve and / or decompose in FIG. 2A, holes (9) can be formed as in FIG. 2B. By doing so, in the case where there are the outer layer 1, the outer layer 2, and other layers, holes can be formed at arbitrary positions in the other layers, and it becomes easy to control the air permeability and heat retention by appropriately changing the area and number of the holes. Also, when there are holes in the outer layer 1, the positional relationship can also be controlled. Usually, the closer the positional relationship is to the holes in the outer layer 2, the more the air permeability increases and the heat retention tends to decrease.

[0050] Examples of water-soluble fibers include water-soluble fibers such as polyvinyl alcohol fibers. By using water-soluble fibers for at least one warp thread and at least one weft thread and dissolving and removing them in water, holes can be formed at the intersections between the warp and weft threads. The water temperature during removal is preferably 20°C or higher, more preferably 50°C or higher. Furthermore, dissolution and removal in a water bath at 100°C or lower is preferred.

[0051] The specific solvent for easily alkali-soluble fibers such as polyester fibers and polylactic acid fibers can be exemplified by solutions of alkaline substances such as sodium hydroxide, potassium hydroxide, calcium hydroxide, magnesium hydroxide, and sodium carbonate, and is preferably used as an alkaline aqueous solution. In particular, an alkaline aqueous solution containing sodium hydroxide is preferred, and it is preferable to set the bath temperature of the alkaline aqueous solution to 50°C or higher, as this provides excellent cost performance during dissolution and / or removal.

[0052] The warp and weft yarns to be dissolved and / or decomposed can be, but are not limited to, water-soluble fibers such as polyvinyl alcohol fibers, polyester fibers copolymerized with a third component such as isophthalic acid, 5-sodium sulfoisophthalic acid, and methoxypolyoxyethylene glycol, and alkali-soluble fibers such as polylactic acid fibers. These can also be used alone or as a composite of two or more types. When these are used alone, two or more can be arranged, paralleled, doubled, or twisted together.

[0053] The multilayer structure woven fabric of the present invention preferably has a bulkiness of 3.00 cm as described in JIS L 1096 (2010). 3 / g or more, more preferably 15.00 cm 3 / g or less. 3 By increasing the bulkiness to 15.00 cm / g or more, more air layers can be formed, resulting in high heat retention. 3 / g or less, the clothing can exhibit better heat retention without impairing the wearing comfort. The bulkiness can be controlled by the basis weight, density, thickness, etc. of the outer layer 1 and the outer layer 2.

[0054] In the present invention, the air permeability is 15.0 cc / cm according to the A method (Fragile type method) described in JIS L 1096 (2010). 2 ·Sec or more, 100.0cc / cm 2 sec or less. In this range, it is possible to effectively prevent stuffiness and overshooting while exhibiting high heat retention. The breathability can be determined by the area per hole and the area per cm of the surface of the outer layer 2. 2 This can be adjusted by the number of holes per unit area, the area ratio of the holes to the surface of the outer layer 2, etc.

[0055] The multilayer woven fabric used in the present invention can be woven by a conventionally known method, and can also be dyed by a conventionally known method. Examples of dyeing processes include scouring, relaxing, heat setting, dyeing, weight reduction, and functional finishing. Functional finishing can include water repellency, antistatic properties, flame retardancy, moisture absorption, antibacterial properties, softening properties, and other known functional finishing processes, as needed.

[0056] The clothing of the present invention at least partially comprises the multilayered woven fabric of the present invention. When the multilayered woven fabric of the present invention is used to make clothing, it is preferable that the outer layer 1 is the skin-facing side. In this case, the outer layer 1 becomes the so-called back layer. This embodiment allows for more effective warmth retention. The clothing is not particularly limited, but examples include tops and pants. In particular, since the multilayered woven fabric of the present invention has excellent heat retention properties and breathability, the clothing of the present invention is more preferably exercise wear or sportswear, and even more preferably for autumn and winter. [Example]

[0057] The multilayer structure fabric of the present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

[0058] (1) Ratio of intersecting points in multilayered fabrics The multilayered fabric was cut to a size that was easy to observe, and both sides were observed using a microscope at 100x magnification. The number of intersections on each observation surface was counted. Intersections that were cut off at the edge of the observation area were not counted. The observation area was randomly changed, and the number of intersections was counted at 10 locations on each side at the same magnification, and the average value was calculated. The side with the fewer intersections was defined as outer layer 1, and the side with the more intersections was defined as outer layer 2. If the number of intersections was the same, one of the layers was designated outer layer 1 and the other outer layer 2. The ratio of intersections was then calculated using the following formula. The measurement results were expressed as the ratio of intersections on the surface (outer layer 1 / outer layer 2). Intersection ratio = (average of 10 intersection points in outer layer 1) / (average of 10 intersection points in outer layer 2).

[0059] (2) Area ratio of crimped fibers The surface of outer layer 1 of the multilayer structure fabric was observed and photographed using a microscope at 50x magnification. The area ratio of crimped fibers to the total area was measured using "WinROOF" manufactured by Mitani Shoji Co., Ltd. Ten randomly selected locations were observed, and the average value of the ten locations was calculated. Next, the surface of outer layer 2 was similarly observed at ten locations, and the average value was calculated.

[0060] (3) Fineness A 100-fold skein was prepared using a measuring machine with a frame circumference of 1.0 m, and the fineness was measured according to the following formula. Fineness (dtex) = Weight of skein for 100 uses (g) x 100.

[0061] (4) Area per hole The surface of the outer layer 2 was observed using a microscope at a magnification of 50 to 300 times, and the area was calculated from the lengths of the holes in the longitudinal and lateral directions. Ten random locations were measured using the same method, and the average value of the 10 locations was expressed with two significant figures. Here, a hole is defined as a hole with an area of ​​5.0 x 10 -9 m 2 This refers to gaps that are equal to or greater than 1 / 100.

[0062] (5) Number of holes and area ratio The sample was cut into a size of 3 cm in length x 3 cm in width, and the surface of the outer layer 2 was observed under a microscope set at a magnification of 30 to 100 times, and the number of holes was counted. If there were holes on the cut surface, they were included in the value. Ten of the above samples were prepared, and the average number of holes on the 10 samples was measured in the same way, and rounded to an integer. In addition, the total area was calculated for each of the 10 samples by multiplying the number of holes in each sample by the area of ​​the holes calculated in the same way as in (4) above, and this was averaged to two significant digits to obtain the area ratio of the holes. Here, a hole is defined as a hole with an area of ​​5.0 x 10 -9 m 2 This refers to gaps that are equal to or greater than 1 / 100.

[0063] (6) Percentage of non-penetrating holes The sample was cut into a size of 2 cm in length x 2 cm in width, and the surface of the outer layer 2 was observed using a microscope set at a magnification of 30 to 200 times. At this time, a background of a color different from the fabric color was used between the microscope stage and the fabric. For example, if the fabric color is black, a white background is used, and if the fabric color is white, a black background is used to make observation easier. All holes in the sample were observed, and those where the background color was visible were considered to be through holes, and those where the background color was not visible were considered to be non-through holes, and the percentage of the number of non-through holes was calculated using the following formula. Percentage of non-penetrating holes = {(Number of non-penetrating holes) / (Total number of holes)} x 100.

[0064] (7) Thickness Measurement was carried out in accordance with Method A (JIS method) described in JIS L 1096 (2010) 8.4.

[0065] (8) Metsuke Measurement was carried out in accordance with Method A (JIS method) described in JIS L 1096 (2010) 8.3.2.

[0066] (9) Bulkiness Measurement was carried out in accordance with Method A described in JIS L 1096 (2010) 8.5.

[0067] (10) Breathability Measurement was carried out according to Method A (Fragile method) described in JIS L 1096 (2010) 8.26.

[0068] (11) Thermal insulation clo value Using a Kato Tech "KES-7" thermal insulation tester, a 15cm x 15cm (10cm x 10cm) sample was placed in a 20°C x 65% RH environment with outer layer 1 (the outer layer containing the crimped fibers) in contact with the hot plate (BT-Box). The tester was warmed up to a 40°C hot plate temperature until the tester's attached power meter reached a stable state with minimal fluctuations. Measurements were then initiated, and the power consumption (W) and ambient temperature (i.e., T-Box temperature) were read over a 60-second period. The thermal insulation clo value was calculated using the following formula. Three test pieces were measured once each, and the average of the three measurements was expressed. clo value = (1 / 0.155) × (ΔT × A) / W where ΔT is the difference between the hot plate temperature and the outside air temperature (℃), W is the power consumption during the 60-second test (W), and A is the area of ​​the hot plate (0.01 m 2 )

[0069] (12) Wearing comfort evaluation regarding warmth The resulting multilayered fabric was used to create U-collar T-shirts. Three subjects wore the T-shirts and sat still for 10 minutes in a temperature and humidity environment of 20°C and 65% RH. The warmth of the T-shirt was evaluated using a sensory evaluation on a three-point scale from 1 to 3, and the average score for the three subjects was calculated. 3: Very warm. 2: Slightly warm. 1: Not very warm.

[0070] (13) Wearing comfort evaluation regarding stuffiness The resulting multilayered fabric was used to create U-collar T-shirts. Three subjects wore the T-shirts and remained seated for 10 minutes in a temperature and humidity environment of 20°C and 65% RH. After remaining stationary, the subjects walked on a treadmill at 6 km / h for 20 minutes while being exposed to a wind speed of 3 m / sec. The T-shirts were evaluated for stuffiness using a sensory evaluation on a three-point scale from 1 to 3, and the average score for the three subjects was calculated. 3: Almost no stuffiness. 2: There is a slight feeling of stuffiness. 1: It feels very stuffy.

[0071] [Example 1] A double-layered fabric was woven using two 56 dtex-48 filament eccentric sheath-core composite false twist textured yarns (DTY) twisted together in a 10:1 alternating warp yarn and a 90 dtex-48 filament alkali-soluble polyester fiber copolymerized with 5-sodium sulfoisophthalic acid in a 10:1 alternating weft yarn. The outer layer 2 consisted of two 56 dtex-48 filament eccentric sheath-core composite false twist textured yarns (DTY) twisted together in a 12:1 alternating weft yarn and a 90 dtex-48 filament alkali-soluble polyester fiber copolymerized with 5-sodium sulfoisophthalic acid in a 12:1 alternating weft yarn. The outer layer 1 consisted of 167 dtex-288 filament conventional PET false twist textured yarn (DTY). After the usual scouring, drying, and intermediate setting, the fabric was treated in a bath containing 3% sodium hydroxide at 95°C for 10 minutes to completely dissolve the alkali-soluble polyester fiber. After that, the fabric was dyed using the usual dyeing method and water absorption processing, and a weft double woven fabric was produced in which outer layer 1 was a 1 / 5 twill modified weave and outer layer 2 was a plain weave modified weave, and the weft yarn of outer layer 1 contained a large amount of crimped fibers.

[0072] The obtained multilayer structure fabric had a ratio of crossing points of outer layer 1 / outer layer 2 of 0.13, and the number of crossing points in outer layer 1 was smaller than the number of crossing points in outer layer 2. The area ratio of crimped fibers was 100% in both outer layer 1 and outer layer 2. The pore area was 3.8 × 10 -8 m 2 / piece, number of holes: 11 / cm2 The pore area ratio was 0.42% and the non-penetrating pore ratio was 100%. Furthermore, the bulkiness described in JIS L 1096 (2010) was 3.54 cm 3 / g, heat retention clo value is 0.76, and breathability is 21.0cc / cm according to JIS L 1096 (2010) method A (Fragile type method). 2 The average comfort rating for warmth was 2.7 points. The average comfort rating for stuffiness was 2.3 points. This indicates that the multilayered fabric has high heat retention in the skin-facing area, good breathability, and little stuffiness.

[0073] [Comparative Example 1] A fabric was woven using two parallel strands of 56 dtex-48 filament eccentric core-sheath composite false twist textured yarn (DTY) as the warp and outer layer 2 weft, and 167 dtex-288 filament regular PET false twist textured yarn (DTY) as the weft for outer layer 1. After the usual scouring, drying and intermediate setting, the fabric was subjected to the usual dyeing process and water absorption treatment to produce a weft double woven fabric with a 1 / 5 twill variation weave for outer layer 1 and a plain weave variation weave for outer layer 2.

[0074] The obtained multilayer structure fabric had a ratio of crossing points of outer layer 1 / outer layer 2 of 0.15, and the number of crossing points in outer layer 1 was smaller than the number of crossing points in outer layer 2. The area ratio of crimped fibers was 100% in both outer layer 1 and outer layer 2. The number of holes was 0 / cm. 2 Furthermore, the bulkiness specified in JIS L 1096 (2010) was 3.06 cm 3 / g, heat retention clo value is 0.68, and breathability is 6.4cc / cm according to JIS L 1096 (2010) method A (Fragile type method). 2 The average comfort rating for warmth was 2.7 points. The average comfort rating for stuffiness was 1.0 points, indicating that the multi-layered fabric had high heat retention on the skin side but poor breathability, resulting in a very stuffy feeling.

[0075] Comparative Example 2 A double-layered fabric was woven using a warp yarn consisting of 84 dtex-72 filament conventional PET fiber and 90 dtex-48 filament alkali-soluble polyester fiber copolymerized with 5-sodium sulfoisophthalic acid, arranged in a 12:3 ratio. The weft yarn consisted of an S-twisted yarn consisting of an 84 dtex-36 filament conventional PET fiber and an 84 dtex-72 filament conventional PET fiber, and an alternating yarn consisting of a 7:3 ratio of an alkali-soluble polyester fiber copolymerized with 5-sodium sulfoisophthalic acid, arranged in a 90 dtex-48 filament. After standard scouring, drying, and intermediate setting, the fabric was bath-treated at 95°C for 10 minutes in a 3% sodium hydroxide solution to completely dissolve the alkali-soluble polyester fiber. This was followed by standard dyeing and water-absorption treatments to produce a single-layered plain weave fabric.

[0076] The obtained single-layer structure fabric had almost the same number of crossing points on the front and back, and the area ratio of crimped fibers was 0% in outer layer 1 and outer layer 2. The pore area was 1.7 × 10 -7 m 2 / piece, number of holes: 10 / cm 2 The structure was such that the pore area ratio was 1.7% and the non-penetrating pore ratio was 0%. Furthermore, the bulkiness described in JIS L 1096 (2010) was 3.26 cm 3 / g, heat retention clo value is 0.69, and breathability is 64.0cc / cm according to JIS L 1096 (2010) method A (Fragile type method). 2 The average comfort rating for warmth was 1.7 points. The average comfort rating for stuffiness was 2.7 points. Although the fabric did not have sufficient heat retention on the skin side, it was a single-layer fabric with good breathability and little stuffiness.

[0077] From the above, it has been found that the multilayered fabric used in the present invention combines warmth and breathability, and can be used extremely comfortably for general clothing purposes as well as for sports and outdoor activities and for clothing that comes into direct contact with the skin.

[0078] [Table 1] [Explanation of symbols]

[0079] 1: Outer layer 1 warp thread 2: Outer layer 1 weft 3: Intersection point of weft yarn 2 in outer layer 1 4: Intersection point of warp thread 1 in outer layer 1 5A: Warp yarn of the layer corresponding to the outer layer 2 of the intermediate body for producing a multilayer structure fabric 5B: outer layer 2 warp 6A: Weft yarn of the layer corresponding to the outer layer 2 of the intermediate body for producing a multilayer structure fabric 6B: Outer layer 2 weft 7: Dissolving and / or decomposing fibers 8: Intersection point of warp thread 5B in outer layer 2 9: Hole 10:A component 11:B component a: Center of gravity of the core component (component A) in the cross section of an eccentric core-sheath composite synthetic fiber C: Center of gravity of the entire fiber in the cross section of an eccentric core-sheath type composite synthetic fiber

Claims

1. At least a portion of outer layer 1 constituting one surface of the multilayer structure woven fabric contains crimpable fibers, the crimpable fibers being eccentric core-sheath type composite synthetic fibers, the number of crossing points on the surface of outer layer 1 being fewer than the number of crossing points on the surface of outer layer 2 constituting the surface opposite to outer layer 1, and at least a portion of outer layer 2 has holes in the thickness direction, and the area per hole is 1.0 × 10 －８ m ２ / piece or more, 5.0×10 －７ m ２ / piece or less, and ２ The number of holes per cm is 4 ２ a multilayer structure woven fabric having a pore density of 0.10% or more and 50 pores / cm 2 or less, an area ratio of the pores on the surface of the outer layer 2 being 0.10% or more and 3.0% or less, 80% or more of the pores being non-through pores, and a bulkiness according to JIS L 1096 (2010) of 3.00 cm 3 / g or more.

2. 2. The multi-layered woven fabric according to claim 1, wherein the crimpable fibers have a single filament fineness of 1.5 dtex or less.

3. The air permeability according to JIS L 1096 (2010) method A (Fragile method) is 15.0 cc / cm ２ ・sec or more, 100.0cc / cm ２ 3. The multilayer structure woven fabric according to claim 1, wherein the stretching time is 1 / 2 sec or less.

4. A garment comprising at least a part of the multilayer structure fabric according to any one of claims 1 to 3.

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