JP2016041859A - Down jacket including side cloth made from woven fabric having excellent transparency - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, in order to provide nonconventional clothing or bedding through which inner cotton can be seen, a woven fabric having high transparency such that the inner cotton can be seen through, strength required as side cloth of the clothing or bedding, and low air permeability.SOLUTION: A woven fabric is constituted by a multifilament having single fiber fitness of 0.5 to 3.0 dtex and total fineness of 3 to 25 dtex and has a cover factor of 1300 to 2500. The woven fabric has a visual light transmittance of 25 to 80% and an L* value equal to or larger than 37.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a woven fabric having transparency, and more particularly to a woven fabric suitably used for a side such as a down wear, a down jacket, a futon, and a sleeping bag.

  As a fabric used for the side of down wear and down futons, a fabric with high fabric strength and low air permeability is required in order to prevent breakage and prevent blowout of cotton and down. Recently, there is a demand for not only low breathability but also lighter fabrics, soft fabrics, and high design and fashionable fabrics.

  However, in order to reduce the weight of the fabric, it has been difficult to maintain the strength of the fabric because the thickness of the fabric has to be reduced, or the fineness of the multifilament constituting the fabric has to be reduced.

  As an example of dealing with such a problem, for example, a woven fabric composed of a base yarn made of synthetic fiber and a reinforcing yarn, wherein the fineness of the base yarn is 10 to 30 dtex, and the fineness of the reinforcing yarn is a fineness of 20 dtex. A woven fabric having a diameter of ˜60 dtex is known (Patent Document 1). In the woven fabric, a reduction in tear strength is prevented by incorporating reinforcing yarns into the warp and / or weft arrangement at regular intervals.

  As another example, a woven fabric composed of synthetic fiber multifilaments having a fineness of 15 to 40 dtex, and a thin fabric woven with a silicone-based resin processing to provide sufficient tear strength is also known. (Patent Document 2).

  In particular, as a woven fabric that can be suitably used for the side of the down jacket, for example, a woven fabric woven using a polyamide multifilament having a yarn fineness of 30 dtex or less and a single yarn fineness of 1.2 dtex or less. A woven fabric having a certain tear strength is also provided (Patent Document 3).

JP 2004-31015 A JP 2008-101295 A JP 2005-48298 A

  By the way, down, cotton, feathers and the like used for down jackets and the like are not usually processed to enhance the design, and these cannot be said to be beautiful in appearance. For this reason, the conventional down jacket has improved the fashionability of clothing by changing the sewing design and the color and pattern of the side used so as not to show the padding of the down etc. as much as possible.

  Contrary to the conventional way of thinking, the present inventors have come up with the idea of improving the design of clothing by increasing the transparency of the side and positively showing batting. Then, the present inventors examined the technique illustrated previously in order to try provision of the fabric which has transparency.

  However, the woven fabric of Patent Document 1 lacks aesthetics because the reinforcing yarn looks like warps and wefts, and cannot fully express the beauty of the batting. Further, the woven fabrics of Patent Documents 2 and 3 cannot be said to have sufficiently small fineness, and did not have the desired transparency.

  Under such circumstances, in the present invention, in order to provide clothes and bedding through which unfilled batting can be seen, the transparency is so high that the batting can be seen through, and it has the strength necessary for the side of clothes and bedding. In addition, the present invention has been aimed at providing a fabric having a lower air permeability.

  As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have a single filament fineness of 0.5 to 3.0 dtex and a total fineness of 3 to 25 dtex as a multifilament constituting the woven fabric. If the L * value of the woven fabric is controlled to a lightness of 37 or more in the dyeing process, the strength required for the woven fabric is low. The inventors have found that a woven fabric having a very high transparency with a visible light transmittance of 25 to 80% can be obtained while maintaining the air permeability, and completed the present invention.

That is, the woven fabric according to the present invention is a woven fabric having a single yarn fineness of 0.5 to 3.0 dtex, a cover factor composed of multifilaments having a total fineness of 3 to 25 dtex, and a visible light of 1300 to 2500. The transmittance is 25 to 80%, and the L * value is 37 or more. The refractive index of the multifilament in the fiber cross-sectional direction is preferably 1.47 to 1.57. Furthermore, it is a more preferable aspect that the multifilament contains 0 to 0.5% by mass of titanium oxide and the multifilament has a breaking strength of 3.5 to 10 cN / dtex. In addition, it is desirable that at least one surface of the woven fabric is calendered and a fluorine-based resin coating is formed on the surface of the woven fabric.
The present invention also includes a down jacket characterized in that the fabric is used as a side fabric and colored batting is used.

  According to the present invention, a woven fabric having high transparency and excellent aesthetics can be obtained. Further, this fabric has a predetermined tear strength, and is thin and lightweight. Moreover, since this fabric has low air permeability, it can be suitably used as a side fabric for down wear, down jackets, futons, sleeping bags and the like.

1 is a cross-sectional photograph of a woven fabric (after calendering) produced in Example 1. FIG. FIG. 2 is a structure diagram showing an example of the woven structure of the fabric of the present invention. FIG. 3 is a structure diagram showing another example of the woven structure of the fabric of the present invention.

1. Multifilament The fabric of the present invention is produced by weaving multifilaments. First, the multifilament will be specifically described.

  The multifilament of the present invention is formed by twisting a plurality of fibers (hereinafter also referred to as “monofilament”). In order to express transparency while giving a certain degree of strength to the resulting woven fabric, the fineness (total fineness) of the multifilament is, for example, 3 dtex or more, more preferably 5 dtex or more, and 7 dtex or more. Further preferred. The fineness of the multifilament is 25 dtex or less, more preferably 16 dtex or less, and still more preferably 12 dtex or less. When the fineness of the multifilament is in the above range, a woven fabric having high transparency and a light and thin ground and having a predetermined strength can be obtained. On the other hand, if the fineness of the multifilament is smaller than 3 dtex, the woven fabric is difficult to express sufficient strength. On the other hand, if it is larger than 25 dtex, the transparency of the fabric may be lowered.

  The higher the breaking strength of the multifilament, the better. The breaking strength of the multifilament is, for example, preferably 3.5 cN / dtex or more, more preferably 4.0 cN / dtex or more, still more preferably 4.5 cN / dtex or more, and 10 cN / dtex or less. More preferably, it is 6 cN / dtex or less, More preferably, it is 5.5 cN / dtex or less. If the strength of the multifilament is 3.5 cN / dtex or more, a fabric having an appropriate tear strength can be obtained even when a filament with high flatness is used.

  The breaking elongation of the multifilament is not particularly limited, but is preferably 35% or more, more preferably 38% or more, preferably 50% or less, and more preferably 48% or less. . When the elongation at break is less than 35%, when a predetermined force is applied to the fabric, the stress against this force is concentrated on one monofilament, and the fabric is easily torn. Further, when the elongation at break is higher than 50%, the raw yarn is caused by strong tension caused by friction with various yarn-contacting parts (for example, a device for achieving high-speed weaving and high-density weaving). It stretches out, making it easier to break the yarn. Furthermore, since the breaking strength is also lowered, there is a problem that the tearing strength when it is made into a woven fabric is lowered.

  The number of monofilaments constituting one multifilament can be appropriately selected according to the relationship between the fineness of the multifilament (total fineness) and the fineness of the monofilament. For example, it is preferably 2 or more and 3 or more. More preferably, it is 5 or more, preferably 35 or less, more preferably 25 or less, and still more preferably 15 or less. If the number of filaments is within the above range, when a predetermined force is applied to the woven fabric, the stress against this force is not concentrated on one monofilament, but the stress is distributed to a plurality of monofilaments. Thereby, since the stress concerning one monofilament can be reduced, tearing strength improves.

  In the present invention, it is preferable not to use titanium oxide as a dulling agent as much as possible. However, for the purpose of improving the spinning property, a filament can be formed by appropriately adding titanium oxide. For example, the titanium oxide is preferably contained in an amount of 0 to 0.5% by mass, more preferably 0 to 0.1% by mass, and still more preferably 0 in 100% by mass of the total amount of the resin constituting the multifilament. It is -0.05 mass%, and 0 mass% is optimal. If the content of titanium oxide is within the above range, it is preferable because the transparency of the fabric can be maintained.

  In order to increase the transparency of the woven fabric, it is important to suppress light absorption, refraction, and irregular reflection inside the fiber. Therefore, the refractive index (fiber cross-sectional direction) of the multifilament of the present invention is preferably closer to the refractive index of air in order to suppress reflection and refraction of light on the fabric surface. The refractive index (fiber cross-sectional direction) of the multifilament is, for example, preferably 1.47 or more, more preferably 1.48 or more, still more preferably 1.49 or more, and 1.57 or less. Is preferable, more preferably 1.55 or less, and still more preferably 1.52 or less. If the refractive index of the resin is within the above range, light reflection and refraction are less likely to occur, so that a fabric with better transparency can be produced. In addition, the measuring method of the refractive index of a multifilament is explained in full detail in the Example column.

  Next, the monofilament constituting the multifilament will be specifically described.

  The fineness (single yarn fineness) of the monofilament is 0.5 dtex or more, more preferably 1.0 dtex or more, still more preferably 1.2 dtex or more, 3.0 dtex or less, and 2.5 dtex or less. More preferably. If the fineness of the monofilament is within the above range, a woven fabric having an appropriate tear strength and low breathability can be obtained. On the other hand, if the fineness of the monofilament is less than 0.5 dtex, the transparency may be lowered or the tearing strength may not be sufficiently exhibited. Moreover, if the fineness of the monofilament exceeds 3.0 dtex, the air permeability of the fabric may be deteriorated or the texture may be hardened.

  In the case of using polyester, the intrinsic viscosity of the resin used as the raw material for the monofilament is preferably 0.58 or more, more preferably 0.60 or more, and preferably 1.00 or less. More preferably, it is 90 or less. If the intrinsic viscosity of the resin is within the above range, a monofilament having an appropriate breaking strength can be obtained, and the production cost can be kept low. Further, it is preferable that the intrinsic viscosity of the resin is 0.58 or more because a uniform cross-sectional shape can be stably produced when the fiber cross section is flattened. On the other hand, when the intrinsic viscosity of the resin is less than 0.58, when the fiber cross section is flattened, the flat cross section fiber is weaker in breaking strength than the round cross section fiber, so the tear strength of the product and the decrease in the breaking strength are reduced. Problems such as deterioration in workability due to insufficient elongation at break and deterioration in product durability are likely to occur. Moreover, since the manufacturing cost of a textile fabric will become high when intrinsic viscosity exceeds 1.00, it lacks practicality.

  For example, in the case of nylon, the relative viscosity of the resin used as the raw material for the monofilament is preferably 2.0 or more, more preferably 3.0 or more, and preferably 4.5 or less. More preferably, it is 5 or less. When the relative viscosity of the resin is 2.0 or more, the obtained monofilament has an appropriate breaking strength. If the relative viscosity of the resin is 3.0 or more, a cross section having a high flatness can be stably spun. On the other hand, if the relative viscosity of the resin is less than 2.0, when the fiber cross section is flattened, the flat cross section yarn may have a lower breaking strength than the round cross section yarn. Deterioration of processing operability due to reduction and insufficient elongation at break and deterioration of product durability are likely to occur. In addition, if the relative viscosity of the resin exceeds 4.5, the yarn operability is deteriorated and the production cost increases, which is not preferable.

  The raw material resin for the monofilament is not particularly limited, but polyesters such as polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate; polyolefins such as polyethylene and polypropylene; nylon 6, nylon 66, nylon 46, nylon 12, nylon 610, nylon 612 Or, polyamides such as copolymers thereof; various polymers such as polyacrylonitrile, polyvinyl chloride, polyvinyl alcohol, polystyrene, and cellulose; Of these, polyamides are preferable because they can exhibit a soft texture even if the monofilament has an irregular cross section.

  The general-purpose fibers having the above-mentioned refractive index include polyolefin fibers such as polyethylene and polypropylene; polystyrene fibers; polyester fibers such as polyethylene terephthalate fibers; polyamide fibers such as nylon 6 fibers and nylon 66 fibers; acrylic fibers. And cellulose fibers such as tri (di) acetate fiber, cupra and rayon; Of these, polyester fibers and polyamide fibers are preferred. In particular, nylon 6 fiber and nylon 66 fiber are more suitable for the present invention because they can exhibit both effects of fiber strength and transparency.

  Moreover, you may add a hygroscopic substance, antioxidant, a delustering agent, a ultraviolet absorber, an antibacterial agent etc. to the said monofilament as needed, individually or in mixture. However, it is necessary to pay attention to the type and concentration of additives so as not to lower the transparency. In addition, in order to improve the breaking elongation of the fabric, it is also a preferable aspect to increase the elongation of the monofilament.

  For example, if the multifilament is a polyamide multifilament or a polyester multifilament, it can be produced by two steps using a spinning draw continuous spinning stretcher or a spinning device and a stretcher. For example, when the spin draw method is employed, the speed of the spinning take-up godet roller may be set to 1500 m / min to 4000 m / min.

2. Woven fabric The woven fabric of the present invention is a woven fabric in which the multifilament is composed of 50% or more, and the more blended amount of the multifilament is more preferable.

  The woven structure is not particularly limited, and any structure such as a plain structure, a twill structure, and a satin structure can be used. In particular, since the air permeability can be suppressed, it is preferable to adopt a plain structure as the woven structure. On the other hand, in order to increase the tear strength of the fabric, a ripstop taffeta, particularly a double lip, is preferably employed. For example, the woven structure shown in FIGS. 2 and 3 is preferable.

  The loom used for manufacturing the fabric is not particularly limited, and a water jet loom, an air jet loom, and a rapier loom can be used as appropriate.

  The warp density of the woven fabric is preferably 140 to 380 yarns / inch, and more preferably 200 to 250 yarns / inch. The weft density of the woven fabric is 100 to 350 yarns / inch, and more preferably 140 to 250 yarns / inch. The green machine density and the finishing density may be the same or different.

The cover factor (CF) of the resulting fabric is 1300-2500. The cover factor (CF) is preferably 1450 or more, more preferably 1550 or more, and preferably 2000 or less, more preferably 1700 or less. If the cover factor of the obtained woven fabric is within the above range, a lightweight, thin fabric with low air permeability can be obtained. If the cover factor of the fabric is less than 1300, it is difficult to obtain a fabric having a desired air permeability. On the other hand, when the cover factor exceeds 2500, the air permeability of the fabric can be controlled to be low, but the fabric tends to be heavy and the transparency is also lowered.
The cover factor (CF) of the fabric is calculated by the following formula.
CF = T × (DT) ^1/2 + W × (DW) ^1/2
In the formula, T and W indicate the warp density and weft density (inches / inch) of the woven fabric, and DT and DW indicate the fineness (dtex) of the warp and the weft yarn constituting the woven fabric.

The fabric weight is preferably 10 g / m ² or more, and more preferably 15 g / m ² or more. Further, it is preferably 60 g / m ² or less, more preferably 45 g / m ² or less, and further preferably 30 g / m ² or less. If the fabric weight of the obtained woven fabric is within the above range, it is preferable because a woven fabric having a light weight and a low air permeability can be obtained. On the other hand, when the fabric weight is less than 10 g / m ^2, it is difficult to obtain a fabric with low air permeability, which is not preferable. On the other hand, when the fabric weight exceeds 60 g / m ² , the air permeability can be kept low, but the fabric becomes thick.

3. About various processes Below, the various methods of processing textiles are explained.

  In the present invention, it is also possible to dye the woven fabric after weaving. The color may be appropriately selected according to the application. When the color becomes dark, there is a concern that the visible light transmittance of the fabric will be reduced and it will be difficult to see the batting from the outside. Therefore, in order to take advantage of the transparency of the fabric, white type; beige type; gray type; pink type; It is better to dye the woven fabric with a light color such as lightness. Examples of the method for dyeing a woven fabric include a method of scouring, relaxing, presetting, dyeing, and finishing a woven fabric using a processing machine or the like.

  In the present invention, it is preferable to perform calendering on at least one side of the fabric. By calendering at least one side of the woven fabric, the monofilaments are arranged on the calendered surface and compressed and fixed, so that a woven fabric with low air permeability can be obtained. In addition, when flat fibers are used, if the fabric is calendered, the flat cross-section fibers are arranged in a direction parallel to the cross section of the fabric, and the distance between the flat fibers becomes dense. It can be remarkably improved.

  The calendering may be performed on only one side or both sides of the fabric, and in the present invention, it is particularly preferable to perform calendering only on one side. By applying calendering, the multifilaments on the fabric surface can be compressed to smooth the surface. This smooth surface contributes to improving the transparency of the fabric.

  The calendered surface can be used on either the outside air side (outside) and / or the cotton side (inside) of the down jacket. In order to suppress reflection of incident light on the surface of the fabric, it is preferable to sew the garment so that the calendered surface is the cotton side (inside) of the down jacket. When calendering is performed on both sides of the fabric, either side may be on the cotton side (inside), and if the number of times calendering is different, the side with more calendering times is on the cotton side (inside) It is good to.

  The calendering temperature is preferably 50 ° C. or more, more preferably 80 ° C. or more, higher than the glass transition temperature of the monofilament raw resin. Moreover, it is preferable that it is 20 degreeC or more lower than melting | fusing point of raw material resin, and it is more preferable that it is 30 degreeC or more lower. By setting the calendering temperature within the above range, a woven fabric having low air permeability and high tear strength can be obtained. If the calendering temperature is lower than + 50 ° C. compared to the glass transition temperature of the raw material resin, the monofilament has a low degree of compression and it is difficult to produce a woven fabric with low air permeability. On the other hand, when the melting point of the raw material resin is higher than −20 ° C., the degree of compression of the monofilament is increased, but the tear strength of the fabric may be reduced. For example, when the monofilament is formed from a polyamide resin, the calendering temperature is preferably 130 ° C. to 200 ° C., and more preferably 120 ° C. to 190 ° C. Moreover, when using polyester as a raw material, it is preferable that the temperature of a calendar process is 140 to 240 degreeC.

The calendering pressure is preferably 0.98 MPa (10 kgf / cm ² ) or more, more preferably 1.96 MPa (20 kgf / cm ² ) or more, and 5.88 MPa (60 kgf / cm ² ) or less. Preferably, the pressure is 4.90 MPa (50 kgf / cm ² ) or less. By setting the calendering pressure within the above range, a woven fabric having both low air permeability and tear strength can be obtained. On the other hand, if the calendering pressure is less than 0.98 MPa (10 kgf / cm ² ), the degree of compression of the monofilament is so weak that a fabric having a low air permeability may not be obtained. On the other hand, if it is larger than 5.88 MPa (60 kgf / cm ² ), the monofilament is excessively compressed and the tear strength of the fabric may be lowered.

  The material of the calender roll is not particularly limited, but one roll is preferably made of metal. The metal roll can adjust its own temperature and can uniformly compress the dough surface. The other roll is not particularly limited, but is preferably made of metal or resin, and in the case of resin, nylon is preferred.

  Note that the number of times of calendar processing is not particularly limited, and may be one time or may be performed a plurality of times.

In the present invention, the surface of the woven fabric can be subjected to water repellent treatment. The water repellent may be a general water repellent for fibers. For example, a silicone water repellent, a fluorine water repellent composed of a polymer having a perfluoroalkyl group, and a paraffin water repellent are preferably used. Among them, the use of a fluorine-based water repellent (particularly, an acrylate polymer of perfluoroalkyl acid) is particularly preferable because the refractive index of the coating can be kept low and the reflection of light on the fiber surface can be reduced. As a water repellent method, a general method such as a padding method, a spray method, printing, coating, or a gravure method can be used.
The fluorine-based water repellent includes fluorine-based thickening agents and water / oil repellents.

  In addition, the woven fabric can be used in combination with various functional processing such as coating processing and laminating processing, and flexible finishing and resin processing for adjusting the texture and the strength of the woven fabric, if necessary. For example, amino-modified silicone, polyethylene-based, polyester-based, paraffin-based softener, etc. can be used as the softener. Further, post-processing for finishing such as flexible processing and silicone processing can be performed. As the resin processing agent, various resins such as melamine resin, glyoxal resin, urethane type, acrylic type and polyester type can be used.

4). About various characteristics It can confirm that the textile fabric of this invention has desired transparency by the value of visible light transmittance | permeability. In the present invention, the visible light transmittance of the fabric is 25% or more, preferably 30% or more, and more preferably 40% or more. The visible light transmittance is 80% or less, preferably 70% or less, and more preferably 55% or less. When the visible light transmittance is higher than 80%, the transparency of the fabric is improved. However, in order to produce a woven fabric having such a high visible light transmittance, it may be required to lower the density of the filaments, and such a woven fabric is not preferable because there is a possibility that the batting is blown out. Moreover, it is difficult to express desired transparency in a woven fabric having a visible light transmittance of less than 25%.

The fabric of the present invention preferably has a white to medium color range. For example, the L * value of the woven fabric is 37 or more, more preferably 45 or more, and still more preferably 70 or more. The L * value is preferably 95 or less, more preferably 90 or less.
The L * value is a value standardized by the International Commission on Illumination (CIE) in 1976 and adopted in JIS Z 8729 in Japan. Further, (L * a * b *) is called (CIE) 1976 (L * a * b *) color system, and the lightness in the color system is represented by L *.

  The woven fabric of the present invention has a visual transparency of preferably grade 3 or higher, more preferably grade 3.5 or higher, and still more preferably grade 4 or higher. If the visual transparency is within the above range, the fabric is more transparent, and a fabric in which the batting can be seen on the outside is obtained.

Air permeability by Frazier method of the woven fabric is preferably from 1.5cc / cm ² / s, more preferably not more than 1.0cc / cm ² / s. The lower limit of the air permeability is preferably 0.01 cc / cm ² / s or more, more preferably 0.1 cc / cm ² / s or more. If the air permeability of the woven fabric is within the above range, it is preferable because it is difficult to remove the batting from the woven fabric.

  The tear strength of the woven fabric by the pendulum method is not necessarily limited. However, from the required performance as a side for clothing and feather products, both the warp direction and the weft direction are preferably 5N or more, More preferably, it is more preferably 7N or more. Moreover, it is preferable that it is 50N or less, More preferably, it is 40N or less, More preferably, it is 25N or less. When the tear strength of the woven fabric is within the above range, a woven fabric having a required tear strength in a light and thin ground can be obtained. On the other hand, if the tear strength is less than 5N, the tear strength of the fabric may be insufficient depending on the application. On the other hand, if it exceeds 50 N, it is necessary to increase the fineness, and accordingly, the cloth tends to be thick and hard, which is not preferable.

  Moreover, it is preferable that the thickness of a textile fabric is 0.001-0.1 mm, for example, More preferably, it is 0.005-0.06 mm. A thinner woven fabric is preferable because the woven fabric becomes more transparent.

  The woven fabric of the present invention can be used as a side land such as a down jacket. Since the fabric of the present invention is excellent in transparency, it is possible to show batting unlike a conventional down jacket. Therefore, by using the woven fabric of the present invention on the side fabric, filling colored batting and dare to show the batting, it is possible to provide clothes that are unprecedented and excellent in aesthetics. Although the batting used is not particularly limited, for example, fibers made of synthetic resin such as feathers (down), feathers (feather, small feather), cotton, polyester, etc. can be suitably used, and these batting are mixed. Can also be used. Moreover, from the point of improving the aesthetics of clothes, it is desirable to use colored batting for at least a part, and it is also possible to use colored batting.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited by the following examples, but may be appropriately modified within a range that can meet the purpose described above and below. Of course, it is possible to implement them, and they are all included in the technical scope of the present invention. In the following, “part” means “part by mass” and “%” means “mass%” unless otherwise specified.

<Intrinsic viscosity>
For the intrinsic viscosity (IV), the intrinsic viscosity [η] measured at 30 ° C. using a mixed solvent consisting of p-chlorophenol and tetrachloroethane (p-chlorophenol / tetrachloroethane = 75/25), What converted into the intrinsic viscosity (IV) of the mixed solvent (phenol / tetrachloroethane = 60/40) which consists of a phenol and tetrachloroethane by the following formula was used.
Intrinsic viscosity (IV) = 0.8325 × [η] +0.005

<Relative viscosity>
A sample solution was prepared by dissolving the sample in 96.3 ± 0.1% reagent-grade concentrated sulfuric acid so that the polymer concentration was 10 mg / ml. To measure the relative viscosity, use an Ostwald viscometer with a temperature of 20 ° C. ± 0.05 ° C. and a water fall time of 6 seconds to 7 seconds. It was. After measuring the drop time T ₁ (second) of 20 ml of the sample solution and the drop time T ₀ (second) of 20 ml of the reagent-grade concentrated sulfuric acid used as the solvent, the relative viscosity (RV) of the material is calculated based on the following formula. )
RV = T ₁ / T ₀

<Refractive index>
A biaxially stretched film having a thickness of 20 μm was prepared using a resin as a multifilament raw material. Using this film, in accordance with JIS K7142-1996 5.1 (Method A), a sodium D line is used as a light source, and an Abbe refractometer (4T type manufactured by Atago Co., Ltd.) is used to obtain the refractive index in the film thickness direction. This was taken as the refractive index in the fiber cross-sectional direction of the multifilament. The measurement conditions were temperature: 23 ° C., humidity: 50% RH, and the contact liquid exemplified by JIS was used depending on the type of resin.

<Fineness (total fineness / single yarn fineness)>
For the fineness (total fineness) of the multifilament, three 100-m long multifilament cassettes were prepared, each mass (g) was measured, and the calculated average value was used. The total fineness (dtex) was determined by multiplying this average value by 100 and converting it per 10000 m.
The fineness of the monofilament (single yarn fineness) was a value obtained by dividing the fineness of the multifilament by the number of filaments.

<Breaking strength / breaking elongation>
Using a 4301 type universal material testing machine manufactured by Instron Japan, applying a load (g) of 1/33 to the total fineness (dtex) of the multifilament, a multifilament sample length (yarn length) of 20 cm, and a tensile speed An SS chart was prepared under the condition of 20 cm / min. One sample was measured three times, and the values of breaking strength and breaking elongation were read from each chart. The obtained values were averaged to determine the breaking strength and breaking elongation.

<Cover factor>
The cover factor (CF) of the woven fabric was calculated based on the following formula.
CF = T × (DT) ^1/2 + W × (DW) ^1/2
In the formula, T and W indicate the warp density and weft density (inch / inch) of the woven fabric, and DT and DW indicate the fineness (dtex) of the warp and the weft yarn constituting the woven fabric.

<Weighting>
The fabric weight was measured based on the mass per unit area defined in JIS L 1096 8.4.
In Examples 1 to 5 and 7 and Comparative Examples 1 and 2, the fabric weight after water-repellent processing was measured. In Examples 6 and 8, the basis weight of the fabric without water repellent finish was measured.

<Visible light transmittance>
The visible light transmittance in the wavelength region of 380 nm to 780 nm was measured with a spectrophotometer (Shimadzu UV-3100PC). The integrating sphere attachment device attached to the photometer used ISR-3100 integrating sphere inner diameter 60 mmφ, and the standard white plate used barium sulfate. In order to attach the sample to the sample holder attached to the integrating sphere, two pieces of cardboard were prepared by cutting out a rectangular slit of length 2.5 cm × width 1 cm in the center of a rectangle 6 cm × width 3 cm. The sheet sample was cut into a length of 6 cm and a width of 3 cm, and sandwiched between two prepared cardboard sheets, and then attached to the sample holder. The measurement was performed with the sample holder attached to the mounting position for measuring transmittance on the incident light side of the integrating sphere and the metal layer forming surface of the sheet facing the light source side of the spectrophotometer. Note that the purpose of using the cardboard from which the slit is cut is to prevent the measurement value from degrading due to wrinkling of the sample. Three samples were prepared from the same sample and evaluated by the average value of the three measurement data.

<L * value>
Four measurement doughs were stacked, the same place was measured three times under the following conditions, and the average value was calculated.
Colorimeter: CM-3700d manufactured by Minolta, measurement diameter: 8 mmφ, light source: D65, field of view: 2 °

<Visual transparency>
A gray scale for JIS dyeing fastness test is leaned upward at 45 ° in the center of the back wall of the standard light source device and covered so that the measurement sample comes into contact with the gray scale surface. Whether or not a gray scale white / gray boundary line can be visually recognized was evaluated as visibility. The grade was judged by the lowest gray scale series that was visible. In the present invention, measurement was performed three times at different measurement locations, the series obtained were averaged, and this was used for visual transparency evaluation.
Standard light source device: Verisphere CAC60 (Apparatus for Standard Visual of Color by Reflection & Transmission) manufactured by Leslie Hubble Limited.
Light source: Artificial Daylight BS950PEL, F20T12 / D65 (manufactured by Verify)

<Air permeability>
The air permeability of the woven fabric was measured according to the air permeability A method (Fragile form method) defined in JIS L 1096 8.27.1.

<Tearing strength>
The tear strength of the woven fabric was measured in both directions of the background in accordance with the tear strength D method (penjuram method) defined in JIS L 1096 8.15.5.

<Thickness>
The thickness of the fabric was measured according to the thickness of the fabric defined in JIS L 1096 8.5.1.

<Dyeing method for textiles>
The woven fabric is scoured using an open soaper, heat set (preset) at 190 ° C. for 30 seconds using a pin tenter, and nylon using a liquid flow dyeing machine (manufactured by Nisaka Manufacturing Co., Ltd .: Circular NS). The woven fabric mainly composed of is dyed by an acid dye, and the woven fabric mainly composed of polyester is a disperse dye and is dyed by a conventional method. The fabric was dyed in beige, gray, or dark gray at the dye concentrations shown in Table 1, and then heat set (intermediate set) at 180 ° C. for 30 seconds. Thereafter, calendering and water-repellent treatment with a fluorine-based resin were sequentially performed as necessary.
The unit of the dye concentration shown in the table is% owf (on the weight of fiber).
Dyeing prescription of polyester fabric with disperse dyes-Dye (type and amount added are listed in Table 1)
・ Leveling agent (Disper TL, manufactured by Meisei Chemical Co., Ltd.) 1g / L
-PH adjuster Adjust to pH 5 with acetic acid / ammonium acetate Dyeing conditions: 130 ° C for 45 minutes, bath ratio = 1:12
Dyeing prescription of nylon fabric with acid dyes-Dyes (types and amounts added are listed in Table 1)
・ Leveling agent (Leveron NT, manufactured by Yushi Co., Ltd.) 1g / L
・ PH adjuster Adjust to pH 5 with acetic acid / ammonium acetate Dyeing conditions: 95 ° C., 45 minutes, bath ratio = 1: 12

Example 1
Nylon 6 (NY6, Super Bright) polymer chip (manufactured by Toyobo Co., Ltd.) having a relative viscosity of 2.2 and containing no titanium oxide was used, and a polymer chip having a relative viscosity increased to 3.5 by performing solid phase polymerization was used. Melt spinning was performed from a die having seven round holes at a spinning temperature of 288 ° C. The speed of the three godet rollers provided is set to the first godet roller: 2000 m / min, the second godet roller: 3500 m / min, the third godet roller: 3500 m / min in order from the upstream one, and the temperature of the second godet roller is 153 ° C. And the yarn was stretched. In this way, a multifilament having a fineness of 11 dtex composed of seven monofilaments having a round cross section was obtained. About the obtained multifilament, the breaking strength and breaking elongation were evaluated by the method mentioned above. The results are shown in Table 2.

  The multifilament was used for warp and weft, the warp density was set to 254 / 2.54 cm, the weft density was set to 225 / 2.54 cm, and weaving was performed with the mini lip structure (ripstop taffeta structure) shown in FIG.

The obtained dough was scoured using an open soaper and heat-set at 190 ° C. for 30 seconds using a pin tenter according to a conventional method. Thereafter, calendering (processing conditions: temperature 150 ° C., pressure 2.45 MPa (25 kgf / cm ² ), speed 20 m / min) is applied to one side (back side) of the fabric twice, and then perfluorooctanoic acid (PFOA) is applied. Fluorine-based water repellent having substantially no perfluoroalkyl group ("Asahi Guard (registered trademark) AG-E061" manufactured by Asahi Glass Co., Ltd.) 1% soln. And a silicone-based softener (“Nikka Silicon (registered trademark) DM-100” manufactured by Nikka Chemical Co., Ltd.) 1% soln. Was applied by adjusting the mangle pressure so that the wet pickup would be 50%, dried, and then cured at 190 ° C. for 1 minute to finish. The obtained woven fabric was a woven fabric having a density of 275 / 2.54 cm in the warp direction, 244 / 2.54 cm in the weft direction, and a cover factor (CF) of 1589. About the obtained textile fabric, visible light transmittance, L * value, visual transparency, air permeability, tear strength, and thickness were evaluated by the above methods. The results are shown in Table 2.

Example 2
Using a nylon 6 polymer chip having a relative viscosity of 2.2, a yarn having a total fineness of 22 dtex and a filament count of 20 was produced. In Example 2, a woven fabric was produced in the same manner as in Example 1 except that the structure was changed to a plain weave and the woven fabric was dyed beige by the method described above. The obtained woven fabric was evaluated in the same manner as in Example 1. The results are shown in Table 2.

Example 3
A fabric was prepared in the same manner as in Example 1 except that the fabric described in Example 1 was dyed gray. The obtained multifilament and woven fabric were evaluated in the same manner as in Example 1. The results are shown in Table 2.

Example 4
Polymer whose intrinsic viscosity is increased to 0.75 by the solid phase polymerization of polyethylene terephthalate (PET) polymer chip (manufactured by Toyobo Co., Ltd.) having an intrinsic viscosity of 0.62, and 0.01% of titanium oxide is added. Using a chip, a multifilament having a total fineness of 16 dtex and a filament number of 24 was obtained. A woven fabric was produced in the same manner as in Example 1 except that this multifilament was used, the green density was changed, and the woven fabric was dyed beige. The obtained multifilament and woven fabric were evaluated in the same manner as in Example 1. The results are shown in Table 2.

Example 5
A multifilament and a woven fabric were produced in the same manner as in Example 1 except that the fabric was dyed beige and an intermediate set was performed, and then the calendar treatment was performed twice on the back surface and once on the front surface. The obtained multifilament and woven fabric were evaluated in the same manner as in Example 1. The results are shown in Table 2.

Example 6
Addition of 0.2% titanium oxide to the nylon 6 polymer chip used in Example 1 (semi-dull), dyeing the fabric in beige, and no water-repellent treatment (treatment with fluororesin) in the finishing process A multifilament and a woven fabric were produced in the same manner as in Example 1 except that. The woven fabric was evaluated in the same manner as in Example 1. The results are shown in Table 2.

Example 7
A multifilament and a woven fabric were produced in the same manner as in Example 1 except that the fineness of the multifilament was changed to a total fineness of 22 dtex, a filament count of 20 and the woven fabric was dyed gray. The woven fabric was evaluated in the same manner as in Example 1. The results are shown in Table 2.

Example 8
A multifilament and a woven fabric were produced in the same manner as in Example 7, except that the woven fabric was dyed beige and that both the calendar process and the water repellent treatment were not performed in the finishing process. The woven fabric was evaluated in the same manner as in Example 1. The results are shown in Table 2.

Comparative Example 1
A multifilament and a fabric were produced in the same manner as in Example 7 except that the fabric was dyed dark gray. The woven fabric was evaluated in the same manner as in Example 1. The results are shown in Table 2.

Comparative Example 2
Using a polyethylene terephthalate (PET) polymer chip (manufactured by Toyobo Co., Ltd.) having an intrinsic viscosity of 0.62 to which 0.01% of titanium oxide was added, a multifilament having a total fineness of 33 dtex and a filament count of 24 was obtained. A fabric was prepared in the same manner as in Example 1 except that the fabric was dyed gray. The obtained woven fabric was evaluated in the same manner as in Example 1. The results are shown in Table 2.

The woven fabrics of Examples 1 to 8 had high transparency, were lightweight and thin, and had high tear strength.
On the other hand, in Comparative Example 1, the transparency was lowered by staining in dark gray. In Comparative Example 2, the color of the woven fabric itself was an intermediate color, but the resulting woven fabric was inferior in transparency because the fineness of the multifilament was large.

  The present invention is suitably used for side areas such as down wear, down jackets, futons and sleeping bags.

Claims (5)

A single yarn fineness is 0.5 to 3.0 dtex, and a cover factor composed of multifilaments having a total fineness of 3 to 25 dtex is 1300 to 2500,
A woven fabric excellent in transparency, characterized by having a visible light transmittance of 25 to 80% and an L * value of 37 or more.   The woven fabric according to claim 1, wherein the multifilament has a refractive index in the fiber cross-sectional direction of 1.47 to 1.57. The multifilament contains 0 to 0.5% by mass of titanium oxide,
The woven fabric according to claim 1 or 2, wherein the multifilament has a breaking strength of 3.5 to 10 cN / dtex.   The woven fabric according to any one of claims 1 to 3, wherein a calendar treatment is applied to at least one surface of the woven fabric, and a fluorine-based resin coating is formed on a surface of the woven fabric.   A down jacket using the woven fabric according to any one of claims 1 to 4 as a side fabric and using colored batting.