HK1209463B - Textile using a flat multilobar cross-section fiber - Google Patents

Description

Fabric using flat multi-lobal cross-section fibers

Technical Field

The present invention relates to a light and thin fabric having high strength, low air permeability and excellent gloss. More particularly, the present invention relates to a fabric made of a flat multilobal cross-section polyamide fiber of fine denier, which is light and thin and has high strength, low air permeability and excellent gloss.

Background

Recently, as represented by outdoor sports, consumers' leisure preferences have increased year by year. In particular, in the field of use as a sportswear, the demand for sportswear has been increasing year by year with the spread of outdoor sports, and the demand for use as a material for tents, sleeping bags, and canvases, and for weight reduction and thinning of clothing has been increasing. High strength is required for fabrics for sportswear applications, and in particular, improvement in tear strength and abrasion strength is required. In particular, when a film process such as a lamination process is performed, since it is difficult to obtain smoothness of the woven fabric, the tear strength tends to be reduced, and it is increasingly desired to improve the tear strength of the base fabric.

In down jackets, sports materials, and the like, fabrics made of polyester multifilament yarns, nylon multifilament yarns, or composite fibers thereof have been used in many cases because of their excellent mechanical properties with the aim of weight reduction and thickness reduction. These fabrics are soft and lightweight, and have excellent wind resistance, hydrophobicity, firmness, and the like, and therefore are used in a large number of applications such as outer covers, jackets, golf suits, and outdoor clothing for sports.

As an example of solving the problems of high strength, light weight and thinness, patent document 1 discloses a woven fabric composed of synthetic multifilaments, characterized in that: the woven fabric is obtained by calendering at least one surface of the woven fabric and compressing the synthetic multifilament in a state that monofilaments are overlapped with each other in at least one part, the cross-sectional shape of the monofilaments is Y-shaped or cross-shaped, the fineness of the synthetic multifilament is 7dtex to 44dtex, and the cover factor of the woven fabric is 1300 to 2200.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2010-196213

Disclosure of Invention

Problems to be solved by the invention

However, the fabric obtained by the method described in patent document 1 is insufficient in functionality and design properties such as product gloss, because reflected light is concentrated to form a gloss having glare and streak feeling. As described above, even a fabric satisfying the required characteristics of high strength, weight reduction and thickness reduction has not been considered sufficient in terms of the glossy feeling in the conventional art, and a fabric having an elegant and good gloss cannot be obtained. In addition, in the prior art, if the fabric is repeatedly washed, the air permeability is greatly reduced, and for example, in the case of using the fabric as a down jacket, run-down or the like occurs, and sufficient functional durability cannot be obtained.

The subject of the invention is: to solve the problems of the prior art, and to provide a fabric which is light and thin, has high strength, low air permeability and excellent luster, and is suitable for use as a liner of sportswear, or men's clothing represented by down jackets, windproof tops, golf suits, and rainproof clothing; a sewn article using the fabric as at least a part thereof; and a down jacket and a down coat using the fabric as at least a portion thereof.

Means for solving the problems

To achieve the above object, the fabric of the present invention mainly has the following configuration. That is to say that the first and second electrodes,

(1) a fabric having one or both sides calendered, wherein: the polyamide fiber constituting the warp and/or weft of the calendered fabric has a single fiber fineness of 0.5 to 2.5dtex, a total fineness of 5 to 50dtex, a cross-sectional shape of the single fiber that is a flat multi-lobal shape having 6 to 10 lobes, a flatness W of 1.5 to 3.0, and a cover factor of 1200 to 2500,

the flatness W is represented by a line segment a (length of which is α) which is the longest line segment among line segments connecting 2 arbitrary points of the apexes of the flat multilobal projection, and a line segment B (length of which is β) which is another line segment (length of which is β) constituting a circumscribed quadrangle (angle of angle formed by adjacent sides is 90 °) together with a tangent line parallel to the line segment a and including the outermost apex, and the flatness W is α/β.

(2) The fabric according to the above (1), characterized in that:

the polyamide fiber used in the fabric before calendering has a single fiber fineness of 0.4 to 2.2dtex, a total fineness of 4 to 44dtex, a cross-sectional shape of 6 to 10-lobed flat multi-filament,

the length of the longest line segment A among line segments connecting 2 arbitrary points among the apexes of the flat multilobal projections is defined as a, the length of the other line segment B constituting a circumscribed quadrangle together with a tangent line parallel to the line segment A and including the outermost apex (the angle formed by adjacent sides is 90 °) is defined as B, the length of the line segment C connecting the apexes of the adjacent projections at the maximum unevenness among the unevenness formed by the flat multilobal projections is defined as C, and the length of the perpendicular line D drawn from the bottom point of the recess sandwiched between the projections to the line segment C connecting the apexes of the projections is defined as D, and at the same time, the polyamide fiber used in the woven fabric before calendering satisfies the following equation,

flatness F (a/b) of 1.5 to 3.0

The degree of profile F (c/d) is 1.0-8.0.

(3) The fabric according to the above (1) or (2), characterized in that: tear strength of 5.0N or more and initial air permeability of 1.0cc/cm²The ratio of the water to the water is less than s.

(4) The fabric according to any one of the above (1) to (3), characterized in that: the air permeability after washing 50 times was 1.0cc/cm²The ratio of the water to the water is less than s.

(5) The fabric according to any one of the above (1) to (4), characterized in that: the difference between the initial air permeability and the air permeability after washing 50 times was 0.4cc/cm²The ratio of the water to the water is less than s.

(6) A sewn product characterized by: using the fabric of any one of (1) to (5) above as at least a part thereof.

(7) A down coat or down jacket, characterized in that: using the fabric of any one of (1) to (5) above as at least a part thereof.

Effects of the invention

According to the present invention, a fabric having excellent gloss feeling, which is light and thin and has high strength, low air permeability, no glare or streak feeling, can be obtained. Further, a fabric can be obtained which can be suitably used as a liner for sportswear, or women's men's clothing, such as down jackets, wind-proof tops, golf suits, and rain-proof clothing. Further, according to the present invention, a sewn product using the fabric of the present invention as a part thereof can be obtained. In addition, a down jacket and down jacket using the fabric of the present invention as a part thereof can be obtained.

Drawings

Fig. 1 is an SEM photograph showing a side cross-sectional view of a fabric illustrating the fabric of the present invention.

FIG. 2 is a cross-sectional view showing an example of the schematic shape of the cross-sectional shape of a single fiber constituting the fabric of the present invention.

Fig. 3 is a schematic sectional view showing the shape of the discharge hole of the spinneret used in the example of the present invention.

Fig. 4 is a schematic cross-sectional view showing the shape of the discharge hole of the spinneret used in the comparative example.

Fig. 5 is a schematic side sectional view of the Y-section fiber fabric obtained in the comparative example.

Detailed Description

The polyamide constituting the fabric of the present invention is a polymer in which a so-called hydrocarbon group is linked to a main chain via an amide bond, and examples thereof include: polycaprolactam (nylon 6), polyhexamethylene adipamide (nylon 66), polyhexamethylene sebacamide (nylon 610), polytetramethylene adipamide (nylon 46), polypentylene adipamide (nylon 56), polycondensation type polyamides of 1, 4-cyclohexanediamine (methylamine) and linear aliphatic dicarboxylic acids, and copolymers thereof or mixtures thereof. From the viewpoint of dyeability and color developability, nylon 6 and nylon 66 are preferred, and nylon 6 is more preferred.

The polymerization degree of the polyamide may be appropriately set according to the characteristics required for the fabric, but is preferably 2 or more, more preferably 3 or more, based on a 98% sulfuric acid relative viscometer. When the relative viscosity of 98% sulfuric acid is 3 or more, the cross-sectional shape of the single fiber can be formed into a flat multi-lobal shape of 6 to 10 lobes during spinning, and stable spinning can be performed by controlling the flatness and profile within a specific range. Among them, the relative viscosity of 98% sulfuric acid is more preferably 3.3 or more. The upper limit of the relative viscosity of 98% sulfuric acid is preferably 7 or less from the viewpoint of spinnability.

In addition, additives for improving productivity such as heat resistance (light stabilizers, heat stabilizers, antioxidants, antistatic agents, terminal group regulators, dyeability improvers, and the like) and additives for imparting functionality (ultraviolet absorbers, ultraviolet blockers, contact cold feeling agents, antibacterial agents, and the like) may be added in amounts and types within a range not impairing the object of the present invention. However, since the filament forming property and durability are reduced, the average particle size of the additive is preferably 1 μm or less, and a white pigment may be contained, and the amount of the inorganic particles to be added is not limited, but is preferably 2.0% by weight or less, and more preferably 1.0% by weight or less in the fiber.

The calendered polyamide fibers constituting the woven fabric of the present invention will be described in more detail below.

The cross-sectional shape of the single fiber of the calendered polyamide fiber constituting the woven fabric of the present invention is a flat multilobal shape having 6 to 10 lobes, and it is necessary to have a flatness (W) of 1.5 to 3.0.

Fig. 1 is an SEM photograph (600 x magnification) illustrating a side cross-section of a fabric of the present invention. As shown in FIG. 1, polyamide monofilaments (for example, 1 to 3) positioned on the surface of the calendered fabric are in a smooth state. Therefore, when the flatness (W) is determined, polyamide filaments (for example, 4 to 6) that are not located on the surface of the fabric are used as filaments of the calendered polyamide fibers. In addition, as for the flatness, any 5 polyamide single fibers not located on the surface of the fabric were selected, and the average value of the values measured respectively was used.

Here, the flatness (W) is defined as a flatness when a longest line a (whose length is α) connecting any 2 points of the apexes of the convex portions of the flat multi-lobal shape is drawn and another line B (whose length is β) forming an circumscribed quadrangle (the angle formed by adjacent sides is 90 °) together with a tangent line parallel to the line a and including the outermost apex is drawn, as in the schematic shape example of the cross-sectional shape of the single fiber shown in fig. 2. By setting the flatness (W) (alpha/beta) to 1.5-3.0, the single fibers are overlapped with each other in a state of few gaps in the manufactured fabric, thereby reducing air permeability. When the flatness is within this range, excellent gloss and sufficient strength that can withstand practical use can be simultaneously exhibited. In the case where the flatness is less than 1.5, the surface area is reduced and a sufficient glossy feeling cannot be exhibited. When the flatness exceeds 3.0, the anisotropy of the polymer becomes high to form a dazzling gloss, and a sufficient strength for practical use cannot be obtained. The flatness is preferably 1.5 to 2.8.

The number of the blade portions referred to herein is a value obtained by dividing the number of inflection points of the fiber cross section by 2. That is, in the multi-leaf cross section, since the convex portions and the concave portions sandwiched between the leaf portions, which generally constitute the leaf portions, are alternately present and each have an inflection point, the number of leaf portions can be calculated by dividing the number of inflection points by 2. As shown in FIG. 1, polyamide monofilaments (e.g., 1 to 3) positioned on the surface of the calendered fabric are in a smooth state. Therefore, when the number of the leaf portions is determined, polyamide filaments (for example, 4 to 6) which are not located on the surface of the fabric are used as filaments of the polyamide fibers after calendering.

For the number of leaf portions, any 5 polyamide filaments not located on the surface of the fabric were selected, and the average value of the values measured was used. By having 6 to 10 leaf portions, a good gloss can be obtained. In particular, it is preferable that the gloss is excellent when the number of the leaf portions is 6 to 8, and the gloss is high-grade when the number of the leaf portions is 8, which is more preferable. When the number of the leaf parts is less than 6, glare is caused, artificial luster is formed, and streaks can be seen. When the number of leaf portions exceeds 10, light is scattered to form a hazy gloss, and thus a sufficient gloss cannot be obtained.

By forming the flatness (W) and the number of leaves in the above range, the movement of the single fibers is easily restricted, and by compressing and fixing the single fibers by calendering, the irregularities of the single fibers can be overlapped with each other, and the effects of suppressing air permeability are increased by overlapping the single fibers with a small amount of voids, and the air permeability can be reduced. For example, in the case of the Y cross section or the cross section, although there is a portion (region O) where the concave portions and the convex portions overlap each other and the mesh misalignment is suppressed depending on the overlapping direction of the single fibers, a portion (region X) where the concave portions and the concave portions overlap each other and the mesh misalignment is likely to occur is formed depending on the overlapping direction of the single fibers, and as a result, the air permeability is increased or the mesh misalignment occurs (fig. 5). In addition, since the cross section of the single fiber of the fabric of the present invention has appropriate unevenness, the fabric surface is easily and uniformly formed in a smooth state by calendering, and a good glossy feeling can be obtained.

The single fiber fineness of the calendered polyamide fiber constituting the fabric of the present invention is required to be 0.5 to 2.5 dtex. By making the single fiber fineness within the above range, a fabric having sufficient strength and low air permeability that can withstand practical use can be obtained. When the single fiber fineness is less than 0.5dtex, a sufficient strength that can withstand practical use cannot be obtained, and when the single fiber fineness exceeds 2.5dtex, low air permeability cannot be obtained. The single fiber fineness is preferably 0.5 to 2.0 dtex.

The total fineness of the fibers is required to be 5 to 50dtex from the viewpoint of lightweight of the fabric when used as down jackets or sports materials. By making the total fineness within the range, a fabric that is light and thin and has sufficient strength to withstand practical use can be obtained. In the case where the total fineness is less than 5dtex, a fabric having sufficient strength to withstand practical use cannot be obtained, and in the case where the total fineness exceeds 50dtex, a light and thin fabric cannot be obtained. The total fineness is preferably 5 to 45dtex, and more preferably 5 to 35 dtex.

The total fineness referred to herein is determined in the following manner. That is, 2 threads were drawn at intervals of 100cm in the warp direction or weft direction in the state of the woven fabric, the woven fabric was decomposed into warp threads or weft threads, respectively, and a load of 1/10g/dtex was applied to the decomposed threads to measure the length (Lcm) between 2 points. The yarn was cut between 2 points (L), and the weight (Wg) thereof was measured to calculate the fineness by the following formula.

Total fineness (textile decomposing yarn) ═ W/L multiplied by 1000000(dtex)

The single fiber fineness is a value obtained by dividing the total fineness by the number of filaments.

The polyamide fibers used for the fabric before calendering, which constitute the fabric of the present invention, will be described in more detail below.

The cross-sectional shape of the single fiber of the polyamide fiber used in the pre-calendering fabric constituting the fabric of the present invention is a flat multilobal shape having 6 to 10 lobes, and preferably, the flatness (F) (a/b) is 1.5 to 3.0 and the profile (F) (c/d) is 1.0 to 8.0. Further, if the cross-sectional shape of the single fiber is 6 to 10 leaves, a good glossy feeling can be easily obtained. In particular, the cross-sectional shape is in the range of 6 to 8 leaves, and therefore, the flat multi-leaf shape of 8 leaves is more preferable because it shows a high-grade gloss, and is the most preferable form.

The flatness (F) and the profile (F) are approximate shapes of the cross-sectional shape of a single fiber as shown in FIG. 2, where a is the length of the line segment A, B is the length of the line segment B, C is the length of the line segment C, D is the length of the perpendicular line D, and in this case, a/B is defined as the flatness and C/D is defined as the profile, the line segment A is the longest line segment among line segments connecting arbitrary 2 points in the apexes of the convex portions of the flat multi-leaf shape, the line segment B is a further line segment constituting a circumscribed quadrangle (the angle formed by adjacent edges being 90 °) together with a tangent parallel to the line and containing the outermost vertex, the line segment C is a line segment connecting the apexes of the adjacent convex portions in the maximum concavity and convexity formed by the flat multi-lobed shape, the perpendicular line D is drawn from the bottom point of the concave portion sandwiched between the convex portions to a line segment C connecting the apexes of the convex portions. The cross-sectional shape of the single fibers constituting the yarn was arbitrarily selected from 5 filaments from a cross-sectional photograph (400 times) taken with an optical microscope, and a/b and c/d were calculated, and the average values thereof were defined as the flatness (F) and the profile (F).

By setting the flatness (F) (a/b) to 1.5-3.0, the single fibers are overlapped with each other in a state of few gaps in the fabric to be manufactured, and the air permeability can be reduced. When the flatness is within this range, excellent gloss and sufficient strength that can withstand practical use can be simultaneously exhibited. The flatness is preferably 1.5 to 2.8.

The degree of irregularity (F) (c/d) indicates the size of a concave portion existing between the leaves in the flat multi-leaf shape, and if the degree of irregularity (F) is large, the concave portion is shallow, and if the degree of irregularity (F) is small, the concave portion is deep. In order to increase the low air permeability effect by keeping small gaps between the single fibers and easily overlapping the single fibers when forming the fabric, the degree of profile (F) is preferably 8.0 or less.

On the other hand, the degree of profile (F) is preferably 1.0 or more in order to maintain the strength of the polyamide forming the single fibers. From the viewpoint of gloss and texture, the degree of profile (F) is more preferably 2 to 7.

By using a flat multilobal cross-sectional filament having the flatness (F) and the profile (F) in the above ranges in advance, the movement of the single fibers is easily restricted, and by compressing and fixing the filaments by calendering, the irregularities of the single fibers can be overlapped with each other, and the air permeability suppressing effect can be increased by overlapping with each other in a state where the voids are small, thereby suppressing the air permeability. Further, since the monofilaments have a multilobal cross section, the irregularities of the monofilaments inevitably engage with each other regardless of the direction in which the monofilaments overlap each other, and the mesh displacement of the fabric is suppressed, and therefore, a significant air permeability suppression effect is exhibited even after washing. Further, since the single fibers have appropriate irregularities in cross section, the fabric surface is easily uniformly smoothed by calendering, and a good glossy feeling is easily obtained.

The single fiber fineness of the polyamide fiber used for the fabric before calendering, which constitutes the fabric of the present invention, is preferably 0.4 to 2.2 dtex. When the single fiber fineness is less than 0.4dtex, it is too small to obtain a sufficient strength for practical use. In addition, when the single fiber fineness exceeds 2.2dtex, it is difficult to obtain low air permeability. The single fiber fineness is more preferably 0.4 to 1.8 dtex.

The total fineness is preferably 4 to 44dtex from the viewpoint of lightweight of the fabric when used as a down jacket or a sports material. In the case where the total fineness is less than 4dtex, it is difficult to obtain a fabric having sufficient strength that can withstand practical use. In the case where the total fineness exceeds 44dtex, it is difficult to obtain a light and thin fabric. The total fineness is more preferably 4 to 40dtex, and still more preferably 4 to 31 dtex.

The fabric of the present invention uses the flat multi-lobal cross-section polyamide fiber as warp and/or weft. As the fiber form, a fiber produced by a known method, such as a processed yarn or a twisted yarn, similar to a general synthetic fiber, can be used.

The fabric can be produced by a known method (weaving and dyeing) similar to general synthetic fibers. Preferred production methods are listed below.

In the weaving step, a warp beam is first produced. That is, a beamer is used to produce a warping beam, and then a sizing machine is used to perform sizing when sizing is required, and a beamer is used to produce a loom beam having a desired number of filaments. The beam warping machine can also be used to directly make the loom shaft from the warping beam without the need for sizing. Alternatively, the warp sizing machine may be used to directly form a sizing shaft and then form a loom shaft. Subsequently, the loom shaft was divided and stretched, and the resultant was mounted on a loom, and weft was added for weaving.

As the loom, there are various kinds such as a water jet loom, an air jet loom, a rapier loom, and a gripper loom, and any one of them can be used for manufacturing. The weave may be any of plain weave, twill weave, satin weave, modified weave thereof, and mixed weave thereof, depending on the application in which the fabric is used, but in order to improve low air permeability, plain weave having a large number of binding points is preferable. In addition, in the case where it is necessary to improve the tear strength in a fabric for a down coat, a fabric for an outdoor use, a fabric for a wind-proof coat, or the like, a structure constituting a lattice pattern is preferable, and a tear-proof structure having a tear-proof portion is more preferable.

The fabric of the present invention has a coverage factor (hereinafter, may be abbreviated as CF) of 1200 to 2500. By having the CF in the range, a fabric that is light and thin and has low air permeability is obtained. In the case where CF is less than 1200, although a light and thin fabric can be obtained, it is difficult to satisfy low air permeability. In addition, in the case where CF exceeds 2500, although low air permeability is obtained, it is difficult to obtain a light and thin fabric. The coverage Coefficient (CF) referred to herein is a value calculated by the following equation.

CF＝T×(DT)^1/2+W×(DW)^1/2

Wherein T and W represent the warp density and weft density (root/2.54 cm) of the fabric, and DT and DW represent the total fineness (dtex) of the warp and weft constituting the fabric.

In the dyeing step, scouring processing, pre-setting processing, dyeing processing, and post-setting are performed. For dyeing, acid dyes, metal complex dyes for polyamide fibers can be preferably used. After dyeing, functional processing may be performed for the purpose of imparting a function. For the processing of applying the functional agent, after the functional agent is applied by a dipping method (padding method) or the like, drying and curing are performed. For example, in the case of down coats, outdoor coats, and windproof coats, calendering and hydrophobing are performed as the function-imparting agents, and as the hydrophobing agent, a hydrophobing agent such as an organofluorine compound-based, silicone-based, or paraffin-based one can be used.

The fabric of the present invention requires calendering on one or both sides. As the calendering, a general calendering machine is used, and a hot calendering method is commonly used in recent years. The fabric having a desired air permeability can be obtained by appropriately selecting processing conditions such as the heat shrinkage rate of the fibers, the density of the raw fabric, the heating temperature in the heating and pressing process, the pressing pressure, and the processing time. These conditions are related to each other, but when the thermal shrinkage of the fiber is taken into consideration, the temperature of the heating roll is usually 130 ℃ to 210 ℃, the load of the heating roll is 98kN to 149kN, and the cloth traveling speed may be appropriately set within the range of 10 to 30 m/min.

The tear strength of the fabric of the present invention is preferably 5.0N or more, more preferably 6.0N or more. The direction of the tear strength referred to herein means the tear strength in the longitudinal direction when a flat multi-lobal cross-sectional polyamide fiber is used as a warp, and means the tear strength in the transverse direction when a flat multi-lobal cross-sectional polyamide fiber is used as a weft. In addition, the case of using flat multi-lobal polyamide fibers as warp and weft fibers means tear strength in the longitudinal direction and the transverse direction. By setting the tear strength to 5.0N or more, a fabric having sufficient strength that can withstand practical use can be obtained. From the viewpoint of obtaining a light, thin and high-strength fabric, the tear strength is preferably 40N or less, more preferably 30N or less.

The air permeability (sometimes referred to as initial air permeability) of the fabric of the present invention is preferably 1.0cc/cm²Less than s, more preferably 0.8cc/cm²The ratio of the water to the water is less than s. By making the air permeability to be 1.0cc/cm²At most, a fabric having excellent low air permeability can be obtained. When used as a liner for down jackets, sportswear, and the like, it is preferable that the air permeability is 0.3cc/cm in order to obtain a moderately low air permeability which is easily subjected to expansion and contraction deformation by the entrance and exit of air²More than s.

Further, the air permeability of the fabric of the present invention after washing 50 times is preferably 1.0cc/cm²Less than s, more preferably 0.9cc/cm²The ratio of the water to the water is less than s. So long as the air permeability after washing 50 times is 1.0cc/cm²At a rate of less than s, the down will not be penetrated from the fabric during washing and the down will not be run out due to the dislocation of the meshes of the fabric after washing, and the down run prevention can be obtainedA woven fabric having excellent properties. On the other hand, if the air permeability after washing 50 times exceeds 1.0cc/cm²However, the fabric is likely to run down, and the quality of a down jacket or the like may be greatly deteriorated due to uneven appearance on the surface of the fabric caused by the displacement of the meshes of the fabric.

The fabric of the present invention is easy to further restrict the movement of the single fibers by using the flat multi-lobal cross-sectional yarn having the flatness (F) and the profile (F) within the above ranges in advance, and the movement of the single fibers is compressed and fixed by calendering, whereby the irregularities of the single fibers can be overlapped with each other, and the effect of suppressing air permeability can be increased by overlapping with each other with a small amount of voids, and the air permeability can be reduced. Further, since the single fibers have a multilobal cross section, the irregularities of the single fibers inevitably engage to suppress the mesh displacement of the fabric regardless of the direction in which the single fibers are overlapped with each other, and thus a significant air permeability suppressing effect is exhibited even after washing. For example, in the case of Y-section fibers and cross-section fibers, depending on the direction in which the single fibers are stacked, the recessed portions and recessed portions may overlap each other to form portions in which mesh displacement is likely to occur, and air permeability may increase or mesh displacement may occur (fig. 5).

Further, the difference between the initial air permeability and the air permeability after washing 50 times is preferably 0.4cc/cm in the fabric of the present invention²The ratio of the water to the water is less than s. The fabric of the present invention is a fabric having CF in the above range by using flat multi-lobal cross-sectional filaments having flatness (F) and profile (F) in the above range, so that low air permeability can be maintained after washing, and a high-gloss and uniform fabric surface can be maintained by the effect of suppressing mesh displacement due to the unevenness of single fibers, thereby ensuring the quality of down jackets and the like.

The fabric of the invention can obtain light and thin fabric with high strength, low air permeability, no glare and no streak feeling and excellent luster feeling. Further, a fabric which can be suitably used as a liner for sports, leisure wear, lady's men's clothing, and the like, as represented by a down jacket, a wind-proof coat, a golf suit, a rain-proof garment, and the like, can be obtained.

The sewn product of the present invention is characterized by using the fabric obtained in the present invention as a part thereof. The use is not limited, and may be sportswear, casual wear, or men's dress for women, which are represented by down jackets, windproof tops, golf suits, and rainproof clothes.

In addition, the down jacket and down jacket of the present invention are characterized by using the fabric obtained in the present invention as at least a part thereof.

Examples

The fabric of the present invention will be described in detail below with reference to examples. The measurement values in the examples were measured by the following methods.

A. Relative viscosity

The sample was weighed, dissolved in 98 wt% concentrated sulfuric acid to give a sample concentration (C) of 1g/100ml, and the number of seconds of fall at a temperature of 25 ℃ was measured for the solution using an Ostwald viscometer (T1). The number of seconds of falling of 98 wt% concentrated sulfuric acid having no sample dissolved therein at a temperature of 25 ℃ was measured in the same manner (T2), and the relative viscosity (. eta.r) of 98% sulfuric acid of the sample was calculated by the following equation.

(ηr)＝(T1/T2)+{1.891×(1.000－C)}。

B. Total fineness and single fiber fineness

(a) Nylon 6 fiber

The fiber sample was wound 400 turns on a cloth inspection machine with a frame circumference of 1.125m at a tension of 1/30cN × apparent dtex (decitex). The fiber was dried at 105 ℃ for 60 minutes and transferred to a dryer, and left to stand at 20 ℃ and 55% RH for 30 minutes for cooling, and the mass of the skein was measured, and the mass per 10000m was calculated from the obtained value, and in the case of nylon 6, the official moisture percentage was set to 4.5%, and the total fineness of the fiber was calculated. The total fineness was determined by taking the average value of 4 measurements. The total fineness obtained was divided by the number of filaments to obtain a single fiber fineness.

(b) Fabric decomposing silk

2 threads were drawn at intervals of 100cm in the warp direction or weft direction in the state of the woven fabric, and the warp or weft of the woven fabric in the threads was separated. Then, in order to determine the load, the false total fineness was calculated. The obtained decomposed yarn was subjected to a load of 2g, the length (Lcm) between 2 points was measured, and then cut between 2 points (Lcm), the weight (Wg) thereof was measured, and the false total fineness was calculated by the following formula. Then, a load of 1/10g/dtex was applied to the false total fineness, the length and weight between 2 points were measured in the same manner as described above, and the total fineness was calculated by the following formula.

Total fineness (textile decomposing yarn) ═ W/L multiplied by 1000000(dtex)

The total fineness obtained was divided by the number of filaments to obtain a single fiber fineness (dtex). The same measurement was repeated 5 times, and the average value was described as the result.

C. Cross-sectional shape of nylon 6 fiber

The length of each of a line segment a, a line segment B, a line segment C, and a perpendicular line D, which are calculated by the following formula, were measured by observing the cross-sectional shape with an optical microscope at a magnification of 400 times, wherein the line segment a is the longest line segment among line segments connecting arbitrary 2 points among the apexes of the projections of the flat multilobal shape, the line segment B is another line segment constituting a circumscribed quadrangle (an angle formed by adjacent sides is 90 °) together with a tangent line parallel to the line segment a and including the outermost apex, the line segment C is a line segment connecting the apexes of adjacent projections among the maximum concavities and convexities formed by the flat multilobal shape, and the perpendicular line D is drawn from the bottom point of the concavity sandwiched between the projections to the line segment C connecting the apexes of the projections.

Flatness (F) ═ a/b, a: length of line segment a, b: length of line segment B

Degree of profile (F) ═ c/d, c: length of line segment C, d: length of line segment D

The flatness (F) and the profile (F) were calculated by the above method, and the average value of the arbitrarily selected 5 fibers was used as the flatness (F) and the profile (F) of the yarn.

D. Cross-sectional shape of fabric

The fiber cross-sectional shape was observed from a cross-sectional photograph of the fabric taken by SEM at a magnification of 600, and the flatness (W) and the number of irregularities were determined according to the following methods. In the monofilaments constituting the fabric, 5 fibers were arbitrarily selected from fibers not exposed on the surface subjected to calendering and evaluated, and the average value thereof was defined as the flatness (W) and the number of inflection points of the polyamide fiber.

(a) Flatness (W)

When the longest line segment among line segments connecting 2 arbitrary points among the apexes of the flat multi-lobed projections is a line segment a (the length thereof is α) and the other line segment constituting an circumscribed quadrangle (the angle formed by adjacent sides is 90 °) together with a tangent line parallel to the line segment a and including the outermost apex is a line segment B (the length thereof is β), α/β is defined as the flatness (W) (see fig. 2).

(b) Number of leaves

The number of inflection points in the cross section of the fiber was defined as a value obtained by dividing 2.

E. Tear strength

The tear strength of the woven fabric was measured in both the warp and weft directions in accordance with the tear strength JIS method D (wet grip strength test method) specified in JIS L1096 (2010) 8.14.1.

F. Weight per unit area

The basis weight of the fabric was measured in accordance with "JIS L1096 (2010)8.3.1 positive amount".

G. Degree of air permeability

The air permeability of the fabric was measured according to air permeability a method (frazier type air permeability test method) specified in JIS L1096 (2010) 8.26.1.

(a) Initial air permeability

For the unwashed fabric, the air permeability was measured 3 times, and the average value was used for evaluation.

(b) Air permeability after 50 washes

The washing of the fabric was carried out according to the F-2 method described in the fabric size change of JIS L1096 (2010) 8.64.4. The washing 50 times means a case where washing-dehydrating-drying was repeated 50 times. The air permeability of the fabric after 50 times of washing was measured for the air permeability after 50 times of 3 times of washing, and the average value was used for evaluation.

H. Sense of luster

The gloss of the fabric was evaluated by 5 skilled workers visually against comparative example 1, and the following 5 grades were evaluated. For the fabric calendered on only one side, the calendered side was evaluated. The product was rated at 4 or more.

5: has high quality and elegant luster.

4: has soft luster.

3: normal gloss (comparative example 1).

2: has weak glare or streak feeling.

1: has glare or streak feeling.

I. Evaluation of run Down

In the run-down evaluation of the fabric, a 35cm × 35cm sample (the joint was sealed with resin) filled with 40g of down was prepared using the fabric after washing 50 times, and the sample was placed in a tumble dryer and run for 60 minutes without heating together with 5 rubber tubes specified in JIS L1076 (2010) a method. After the operation is finished, the sample is taken out, and the penetration degree of the down feather is judged by visual observation. The following 5-stage judgment was performed. The product was rated at 4 or more.

5: less than 3

4: 4 to 10

3: 11 to 30

2: 31 to 50 of

1: more than 51

J. Comprehensive evaluation

The gloss and the running evaluation were added and 8 points or more were defined as passed.

[ example 1]

(production of Nylon 6 Flat eight-blade Cross-section fiber)

Nylon 6 having a relative viscosity of 3.5 was melt-discharged from a spinneret having discharge holes formed therein in the shape shown in FIG. 3(A) (slit width: 0.07mm, slit length ratio: e/f: 5/2) at a spinning temperature of 285 ℃ and then cooled, oiled, entangled, drawn at 2800m/min with a godet roller, drawn at 1.4 times, and then heat-set at a temperature of 155 ℃ to obtain a 33dtex/26f flat eight-lobed cross-section fiber of nylon 6 at a take-up speed of 3500 m/min.

From the obtained photographs of the cross-section of the nylon 6 fiber, the flatness (F) and the profile (F) were calculated. The results are shown in table 1.

(22dtex/20f production of Nylon 6 round-section fiber)

Nylon 6 having a relative viscosity of 3.0 was melt-discharged from a spinneret having a circular hole at a spinning temperature of 280 ℃ and then cooled, oiled, and after interlacing, drawn at 2480m/min by a godet roller, then drawn at 1.7 times, and then heat-set at a temperature of 155 ℃ to obtain a nylon 6 circular-section fiber of 22dtex/20f at a winding speed of 4000 m/min.

(production of Fabric)

The flat eight-lobed nylon 6 fiber was used as a weft and a circular nylon 6 fiber of 22dtex/20f was used as a warp, and the weft was woven in a plain weave with a warp density of 188 threads/2.54 cm and a weft density of 135 threads/2.54 cm.

The obtained greige cloth was scoured with a solution containing 2g per liter of sodium hydroxide (NaOH) by an open width soaping machine according to a conventional method, dried at a temperature of 120 ℃ using a tumble dryer, then pre-shaped at 170 ℃, dyed with a tumble dyeing machine, impregnated with a fluorine-based resin compound (padding method), dried (temperature 120 ℃) and post-shaped (temperature 175 ℃). Then, both sides of the fabric were subjected to calendering (processing conditions: roll calendering, heated roller surface temperature 180 ℃, heated roller weight 147kN, cloth traveling speed 20m/min) 1 time, to thereby obtain a fabric. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric. SEM photographs of the fabric side cross-section of the fabric are shown in fig. 1.

[ example 2]

A33 dtex/26f nylon 6 flat octalobal cross-section fiber was produced in the same manner as in example 1 except that 22dtex/20f nylon 6 round cross-section fiber was used as a warp and the spinning temperature of the nylon 6 flat octalobal cross-section fiber was changed to 280 ℃. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 3]

A33 dtex/26f nylon 6 flat octalobal cross-section fiber was produced in the same manner as in example 1 except that 22dtex/20f nylon 6 round cross-section fiber was used as a warp and the spinning temperature of the nylon 6 flat octalobal cross-section fiber was changed to 275 ℃. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 4]

A 33dtex/26f nylon 6 flat hexalobal cross-section fiber was produced in the same manner as in example 1 except that a 22dtex/20f nylon 6 circular cross-section fiber was used as a warp and the discharge hole shape of the spinneret was changed (fig. 3(b), slit width 0.07mm, and slit length ratio g/h: 5/2), to obtain a woven fabric. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 5]

A 33dtex/26f nylon 6 flat ten-lobe cross-section fiber was produced in the same manner as in example 1 except that a 22dtex/20f nylon 6 circular cross-section fiber was used as a warp and the discharge hole shape of the spinneret was changed (fig. 3(c), slit width: 0.07mm, and slit length ratio: i/j: 5/2), to obtain a woven fabric. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 6]

A 22dtex/20f nylon 6 flat eight-lobe cross-section fiber was produced in the same manner as in example 1 except that a 22dtex/20f nylon 6 round cross-section fiber was used as a warp, the number of filaments of the nylon 6 flat eight-lobe cross-section fiber was changed to 20, and the total fineness was 22dtex, to obtain a woven fabric. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 7]

A 44dtex 40 filament nylon 6 flat eight-lobe cross-section fiber was produced in the same manner as in example 1 except that 22dtex/20f nylon 6 round cross-section fiber was used as a warp, the number of filaments of the nylon 6 flat eight-lobe cross-section fiber was changed to 40, and the total fineness was 44dtex, to obtain a woven fabric. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 8]

A 22dtex 12-filament nylon 6 flat eight-lobe cross-section fiber was produced in the same manner as in example 1 except that a 22dtex/20f nylon 6 round cross-section fiber was used as a warp, the number of filaments of the nylon 6 flat eight-lobe cross-section fiber was changed to 12, and the total fineness was 22dtex, to obtain a woven fabric. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 9]

A 44dtex 58-filament nylon 6 flat eight-lobe cross-section fiber was produced in the same manner as in example 1 except that a 22dtex/20f nylon 6 round cross-section fiber was used as a warp, the number of filaments of the nylon 6 flat eight-lobe cross-section fiber was changed to 58, and the total fineness was 44dtex, to obtain a woven fabric. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 10]

A fabric was obtained by producing an 11dtex 8-filament nylon 6 flat eight-lobe cross-section fiber in the same manner as in example 1, except that a 22dtex/20f nylon 6 round cross-section fiber was used as a warp, the number of filaments of the nylon 6 flat eight-lobe cross-section fiber was changed to 8, and the total fineness was 11 dtex. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 11]

A fabric was obtained in the same manner as in example 1, except that one side of the fabric was subjected to 1 calendering (processing conditions: roll press processing, heated roller surface temperature 180 ℃, heated roller weight 147kN, cloth traveling speed 20 m/min). The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 12]

A fabric was obtained in the same manner as in example 1, except that a nylon 6 round-section fiber of 22dtex/20f was used as a warp, a nylon 6 flat eight-leaf-section fiber of 33dtex/26f was produced in the same manner as in example 1, the obtained nylon 6 flat eight-leaf-section fiber was used as a weft, the warp density was set to 220 pieces/2.54 cm, and the weft density was set to 160 pieces/2.54 cm, and weaving was performed in a plain weave. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 13]

A fabric was obtained in the same manner as in example 1, except that a tear-resistant taffeta weave was produced. The physical properties and evaluation results of the obtained fabric are shown in table 2. It is a good fabric.

[ example 14]

A fabric was obtained in the same manner as in example 1, except that the weight of the heating roll was set to 74kN in the calendering process. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. Although the calendering was weak, inferior to example 1 in the gloss feeling and the running down evaluation, a good fabric was obtained.

[ example 15]

A fabric was obtained in the same manner as in example 1, except that 33dtex/26f nylon 6 flat eight-lobed cross-section fibers were produced in the same manner as in example 1, the resulting nylon 6 flat eight-lobed cross-section fibers were used as warp yarns, 22dtex/20f nylon 6 round cross-section fibers were used as weft yarns, the warp density was set to 190 threads/2.54 cm, and the weft density was set to 160 threads/2.54 cm, and weaving was performed in a plain weave. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

[ example 16]

A fabric was obtained in the same manner as in example 1, except that a 33dtex/26f nylon 6 flat eight-lobed cross-section fiber was produced in the same manner as in example 1, the obtained nylon 6 flat eight-lobed cross-section fiber was used as warp and weft, the warp density was set to 190 pieces/2.54 cm, and the weft density was set to 135 pieces/2.54 cm, and weaving was performed in a plain weave. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. It is a good fabric.

Comparative example 1

A woven fabric was obtained in the same manner as in example 1, except that 22dtex/20f nylon 6 round-section fibers were used as warp yarns and 22dtex/20f polyamide round-section fibers were used as weft yarns. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. In particular, since the obtained fabric uses a polyamide fiber having a circular cross section, the overlapping of monofilaments is small even after calendering, and the compression state is poor, so that the air permeability is poor, and the fabric is poor in the running evaluation.

Comparative example 2

A33 dtex/24f nylon 6Y-section fiber was produced in the same manner as in example 1 except that a 22dtex/20f nylon 6 circular-section fiber was used as a warp and a spinneret having Y-shaped discharge holes was changed (in FIG. 4(a), the slit width was 0.07mm and the slit length k was 0.5mm), to obtain a woven fabric. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. The resulting fabric had a significant decrease in air permeability after 50 washes, and was poor in run-down evaluation. In addition, with respect to the glossy feeling, a glare gloss was formed, and the obtained fabric had not only a glare feeling but also a streak feeling, and a fabric having an elegant and high-grade gloss could not be obtained.

Comparative example 3

A33 dtex/24f nylon 6 cross-section fiber was produced in the same manner as in example 1 except that a 22dtex/20f nylon 6 circular cross-section fiber was used as a warp yarn and a spinneret having cross-shaped discharge holes was changed (in FIG. 4(b), the slit width was 0.07mm and the slit length l was 0.5mm), to obtain a woven fabric. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. The obtained fabric had a significantly reduced air permeability after 50 washes, was inferior in lint evaluation, and had a glare luster in terms of a glossy feel, as in comparative example 2.

Comparative example 4

A 33dtex/26F flat eight-lobed cross-section nylon 6 fiber having a flatness (F) of 1.3 was produced in the same manner as in example 1, except that a 22dtex/20F nylon 6 round cross-section fiber was used as the warp and nylon 6 having a relative viscosity of 2.5 was used as the warp, to obtain a woven fabric. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. As a result, the air permeability after 50 washing cycles was poor except that the flatness (W) was low and the gloss was insufficient, and the running-out evaluation was slightly poor.

Comparative example 5

A 33dtex/26F flat eight-lobe cross-section nylon 6 fiber having a flatness (F) of 3.5 was produced in the same manner as in example 1 except that a 22dtex/20F round cross-section nylon 6 fiber was used as a warp yarn and a 4.0 relative viscosity nylon 6 was used, and the spinning temperature was changed to 275 ℃. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. Since the flatness (W) is high, a fabric having a strong glare feeling is formed.

Comparative example 6

A 33dtex/26f nylon 6 flat twelve-blade cross-section fiber was produced in the same manner as in example 1 except that a 22dtex/20f nylon 6 circular cross-section fiber was used as a warp and the discharge hole shape of the spinneret was changed (fig. 4(c), the width of the slit was 0.07mm, and the length ratio of the slit was 5/2, and a woven fabric was obtained. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. Since the cross section was nearly circular, the air permeability after washing 50 times became high, the running evaluation was poor, and a soft glossy feeling could not be obtained.

Comparative example 7

A 22dtex 5-filament nylon 6 flat octalobal cross-section fiber was produced in the same manner as in example 1 except that 22dtex/20f nylon 6 round cross-section fiber was used as the warp, the number of discharge holes of the spinneret was changed to 5, and the total fineness was 22dtex, to obtain a woven fabric. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. Since the single fiber fineness was large, a sufficient result was not obtained in the run evaluation.

Comparative example 8

A fabric was obtained in the same manner as in example 1, except that the cover factor was set to 976. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. Due to the low density, the initial air permeability was poor and the running pile rating was poor.

Comparative example 9

A fabric was obtained in the same manner as in example 1, except that the fabric was not subjected to the calendering process. The physical properties and evaluation results of the obtained fabric are shown in tables 2 and 3. The overlapping of the monofilaments becomes insufficient, and the running evaluation becomes poor.

[ TABLE 3]

As is apparent from the results in tables 2 and 3, the fabric of the examples of the present invention has high strength by holding the fiber in a roughly flat shape, and also has a plurality of leaf portions, so that the movement of polyamide filaments is easily restricted, and by compressing and fixing the polyamide filaments by calendering, the projections and depressions of the filaments overlap each other, and the filaments overlap each other with a small void, and have excellent air permeability, and is a fabric capable of suppressing the run-out. Further, since the cross section of the single fiber constituting the fabric has appropriate unevenness, the surface of the fabric is uniformly smoothed by the calendering, and thus, a high-grade and elegant gloss can be obtained. Due to this excellent characteristic, it is possible to provide a bladder material such as down jackets, and sportswear.

Industrial applicability

The fabric of the present invention is light and thin, has high strength, low air permeability and excellent luster, and can be suitably used as a liner for down jackets, sportswear, and the like.

Description of the reference numerals

1. 2, 3: polyamide monofilament on the surface of calendered fabric

4.5, 6: polyamide filaments not located on the surface of the fabric

A: the longest line segment among line segments connecting arbitrary 2 points of the apexes of the flat multi-lobed projections

B: a further line segment forming an circumscribed quadrangle (the angle formed by adjacent edges is 90 °) together with a tangent parallel to line segment a and containing the outermost vertex

C: line segment connecting peaks of adjacent projections in maximum projections and depressions forming a flat multi-lobed shape

D: a perpendicular line drawn from the bottom point of the concave portion sandwiched between the convex portions to a line segment C connecting the apexes of the convex portions

e: slit length of flat eight-lobed discharge orifice used in example 1

f: slit length of flat eight-lobed discharge orifice used in example 1

g: slit length of flat six-lobe shaped discharge hole used in example 4

h: slit length of flat six-lobe shaped discharge hole used in example 4

i: slit length of flat ten-leaf-shaped discharge hole used in example 5

j: slit length of flat ten-leaf-shaped discharge hole used in example 5

k: slit length of Y-shaped discharge hole used in comparative example 2

l: slit length of the cross-shaped discharge hole used in comparative example 3

m: slit length of flat twelve-leaf-shaped discharge hole used in comparative example 6

n: slit length of flat twelve-leaf-shaped discharge hole used in comparative example 6

Region O: the area where the protrusions of the single fibers adjacent to the concave portions of the single fibers overlap each other

Region X: the area where the recessed parts of the single fibers adjacent to the recessed parts of the single fibers overlap each other

Claims (7)

1. A fabric having one or both sides calendered, wherein:

the polyamide fiber constituting the warp and/or weft of the calendered fabric has a single fiber fineness of 0.5 to 2.5dtex, a total fineness of 5 to 50dtex, a cross-sectional shape of the single fiber that is a flat multi-lobal shape having 6 to 10 lobes, a flatness W of 1.5 to 3.0, and a cover factor of 1200 to 2500,

the flatness W is represented by a line segment A and a line segment B, the line segment A is the longest line segment of line segments connecting any 2 points of the apexes of the convex portions of the flat multilobal shape, the line segment B is another line segment which forms a circumscribed quadrangle together with a tangent line parallel to the line segment A and including the outermost apex, the angle formed by adjacent sides of the circumscribed quadrangle is 90 degrees, the length of the line segment A is alpha, the length of the line segment B is beta, and the flatness W is alpha/beta.

2. A fabric according to claim 1, wherein:

in the fabric before calendering, the used polyamide fiber has a single fiber fineness of 0.4 to 2.2dtex, a total fineness of 4 to 44dtex, a cross-sectional shape of the single fiber is a flat multi-lobal shape having 6 to 10 lobes,

in the flat multilobal shape before calendering, the polyamide fiber used in the fabric before calendering satisfies the following expression when the length of the longest line segment A among line segments connecting 2 arbitrary points among the apexes of the flat multilobal protrusions is a, the length of the other line segment B constituting a circumscribed quadrangle together with a tangent line parallel to the line segment A and including the outermost apex is B, the angle formed by the adjacent sides of the circumscribed quadrangle is 90 °, the length of the line segment C connecting the apexes of the adjacent protrusions at the maximum unevenness among the unevenness formed by the flat multilobal shape is C, and the length of the perpendicular line D drawn from the bottom point of the recess sandwiched between the protrusions to the line segment C connecting the apexes of the protrusions is D,

flatness F (a/b) of 1.5 to 3.0

The degree of profile F (c/d) is 1.0-8.0.

3. A fabric according to claim 1 or 2, wherein: tear strength of 5.0N or more and initial air permeability of 1.0cc/cm²The ratio of the water to the water is less than s.

4. A fabric according to claim 1 or 2, wherein: the air permeability after washing 50 times was 1.0cc/cm²The ratio of the water to the water is less than s.

5. A fabric according to claim 1 or 2, wherein: the difference between the initial air permeability and the air permeability after washing 50 times was 0.4cc/cm²The ratio of the water to the water is less than s.

6. A sewn product characterized by: using as at least a portion thereof the fabric of any one of claims 1 to 5.

7. A down coat or down jacket, characterized in that: using as at least a portion thereof the fabric of any one of claims 1 to 5.