JPH06173135A - Shrinkproof woven fabric composed of regenerated cellulosic fiber and its production - Google Patents

Abstract

PURPOSE:To obtain a shrinkproof woven fabric, having shrinkage suppressed by a structural change in the woven fabric in washing and composed of regenerated cellulosic fiber. CONSTITUTION:Interstices among single fibers corresponding to an increasing ratio of cross-sectional area by swelling of single fiber with water are formed by passing a woven fabric composed of regenerated cellulosic fiber through the first step for immersing the woven fabric in a liquid (a swelling agent) having the high swelling ability for cellulosic fiber, the second step for promoting the swelling by heating, etc., and the third step for carrying out treatment for removing the swelling agent from the woven fabric. Thereby, the woven fabric structure can be controlled to afford the objective shrinkproof woven fabric capable of holding the strength comparable to that before the shrinkproof processing without generating formalin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerated cellulosic fiber woven fabric excellent in shrink resistance and a method for producing the same, and more particularly to a regenerated cellulose based shrink proof fabric which suppresses shrinkage due to structural change of the woven fabric when washed. And its manufacturing method.

[0002]

2. Description of the Related Art Regenerated cellulosic fibers are highly evaluated in the field of clothing such as underwear, linings and outer garments because they have excellent water absorbency and hygroscopicity and have a unique texture that cannot be obtained with synthetic fibers. There is. However, since it shrinks due to washing, many methods for preventing it have been proposed. For example, a method of treating cellulosic fibers with liquid ammonia has been proposed (for example, JP-A-61-1793).
65 publication). This method is a method in which a woven fabric made of cellulose fibers is immersed in liquid ammonia and then subjected to deammonia treatment under tension.However, in the case of regenerated cellulosic fibers, the woven fabric contracts extremely, so Is processed under high tension. However, this method requires -8
Since there is a problem that equipment cost and running cost are high because it is necessary to perform treatment at an extremely low temperature of 0 ° C to -30 ° C, and because single fibers adhere to each other, the texture of the fabric becomes coarse and hard and the scale There is also a problem that occurs.

The most commonly used method of preventing the fabric from shrinking by washing is resin processing, in which a woven fabric composed of regenerated cellulosic fibers is immersed in a treatment bath mainly containing a resin-treating agent and a catalyst. After making it squeeze evenly,
After preliminary drying at 130 ° C, heat treatment is further performed at 130 ° C to 170 ° C. A typical processing agent used for this processing is
As described in “Processing Technology Vol. 24 No. 2 (1986)”, N, N′-dimethylolethylene urea, N, N′-dimethylol-dihydroxyethyleneurea, N, N′-dimethoxymethyl- It is a resin processing agent such as dihydroxyethylene urea.

[0004]

However, although fabrics processed with these resin finishing agents have a shrink-proof effect, formalin released during storage or during wearing causes a strange odor in the sewing workshop or during wearing. There are problems such as skin disorders. Further, there is a problem that the strength of the woven fabric is greatly reduced by the resin processing and the texture peculiar to the regenerated cellulose fiber is impaired.

In order to solve such a problem, a resin processing agent called a non-formalin resin has been developed. For example, JP-A-01-75471 and JP-A-01-2358 are disclosed.
No. 58 is disclosed. However, when processed with these non-formalin resin processing agents, formalin is certainly not generated, it is necessary to attach a large amount of resin to the fabric in order to obtain sufficient shrink resistance, As a result, at present, there is no choice but to cause a large reduction in strength, and no one having good shrink resistance and fabric strength and an extremely small amount of free formalin has not been obtained. Therefore, it is an object of the present invention to provide a shrink-proof woven fabric in which the generation of formalin is extremely small and the same strength as that before the shrink-proof processing is maintained.

[0006]

Means for Solving the Problems The present inventor has been earnestly researching a shrink-proofing method from a viewpoint different from the conventional technology, that is, the shrink-proofing method for a woven fabric made of regenerated cellulosic fibers by resin processing, and the It was found that the structural change of the ply greatly contributes to the shrinkage of the fabric. Therefore, the present invention has been completed as a result of further detailed study focusing on the swelling behavior of single fibers and voids between single fibers, which govern the structural change of the woven fabric. That is, the present invention specifies the inter-single fiber porosity in accordance with the rate of increase in the cross-sectional area due to the water swelling of the single fibers in the warp and weft of the woven fabric, thereby swelling in water such as washing and the structural change of the fabric due to drying. And a woven fabric having shrink resistance.

The shrinkproof fabric comprising regenerated cellulosic fibers according to the present invention has a porosity A between the monofilaments in the warp and weft of the fabric and an increase in the cross-sectional area of the monofilaments when swollen in water as defined by the following formula (3). The yarn is characterized in that the rate x is within the range defined by the following formulas (1) and (2). A ≧ {1-0.94 / (1 + x)} × 100 (%) (1) 0.1 <x <1.6 (2) x = (S _w −S ₀ ) / S ₀ (3) ) However, S ₀ is when left to stand in an atmosphere of 20 ° C. and 65% RH for one day, that is, the single fiber cross-sectional area in a state where the equilibrium moisture content is maintained, and S _w is sufficiently immersed in water of 20 ° C. for 1 hour. It is the cross-sectional area of the single fiber when swollen to. When the warp and weft of the woven fabric are mixed with fibers having different cross-sectional area increase rates of the single fibers when swollen in water, x can be substituted by the number average value of the single-fiber cross-sectional area increase rates. When the single fiber has a circular cross section, the cross-sectional area of the single fiber may be converted into a cross-sectional area by measuring the diameter of the single fiber with an optical microscope. In the case of a non-circular cross section, the cross-sectional area may be calculated by image processing or the like from a micrograph of a cross section of a thin section of single fiber.

The production of the shrink-proof woven fabric comprising the regenerated cellulosic fiber of the present invention is carried out by immersing the woven fabric in a swelling liquid to swell the shrink-resistant woven fabric when producing the shrink-resistant woven fabric from the woven fabric comprising the regenerated cellulosic fiber (green). This is then achieved by including a step of treating with a deswelling agent. At that time, if the swelling ratio y between the swelling of the single fiber defined by the following formula (9) with water and the swelling with the swelling agent is treated under processing conditions selected so as to fall within the range of the following formula (8). More preferable. 0.1 <y <4.0 (8) y = (S _s −S _w ) / S _w (9) where S _s is the single fiber cross-sectional area when immersed in the swelling agent for 1 hour, or S _w is the cross-sectional area of the single fiber when immersed in water at 20 ° C. for 1 hour.

The present invention will be described in detail below. In the present invention, the regenerated cellulosic fiber means viscose rayon, cupra ammonium rayon, and a polymerization degree of 400-5.
00 high strength rayon and organic solvent based regenerated cellulose fiber.

The porosity A between single fibers in the present invention means the ratio of the voids between single fibers to the cross-sectional area of the warp or weft. Here, the cross-sectional area of the yarn means the area of a portion surrounded by the outer contour of the outermost layer portion of the yarn which is a single fiber aggregate. The porosity A between single fibers is obtained by converting the sum of the cross-sectional area of the yarn and the single-fiber cross-sectional area into the number of pixel particles by image-processing an electron micrograph of the cross-sectional structure of the fabric in the warp direction and the weft direction. It can be obtained by substituting the value into the following formula. A = (cross-sectional area of yarn-sum of single fiber cross-sectional area) / cross-sectional area of yarn x
100 (%) However, the measurement method is not limited to this, and the same result can be obtained by calculating from the weight of paper or the like in which a micrograph of a cross section is copied.

In the present invention, the porosity A between single fibers is the warp, where x is the increase rate of the single fiber cross-sectional area during swelling with water.
It is sufficient that both wefts have A ≧ {1-0.94 / (1 + x)} × 100 (%), but A ≧ {1.13-0.94 / (1 + x)} × 100
(%) Is more preferable. In addition, since the number of yarns per unit length of the woven fabric is usually larger than that of the warp yarn, the water swelling of the warp yarn has a great influence on the structural change of the woven fabric. Therefore, the inter-fiber void ratio of the warp yarn is A ≧ {1 .28-0.94 / (1 + x)} * 100
(%) Is more preferable. When the porosity A between single fibers is A <{1-0.94 / (1 + x)} × 100 (%), the structural change of the woven fabric occurs due to the single fiber swelling during washing, and sufficient shrinkage resistance is obtained. I can't. It should be noted that voids may be seen between the warp yarns, between the weft yarns, and between the warp yarns and the weft yarns in the woven fabric, but the voids between these yarns are different from the above-mentioned inter-single fiber voids. Here, when x is 0.1 or less, the fibers are hardly swollen with water, and therefore the woven fabric is not substantially washed and shrunk even if the inter-single fiber porosity does not satisfy the formula (1). When x is 1.6 or more, the single fibers are very easily swelled in water, so that the morphology of the woven fabric is changed by washing even if the porosity between the single fibers satisfies (Equation 1).

The shrinkproof fabric of the present invention is intended for general clothing fabrics. Specifically, the cover factors f ₁ and f
₂ must satisfy the following formulas (4) and (5). 1000 <(f ₁ + f ₂ ) <2500 (4) 0.5 <(f ₁ / f ₂ ) <2.0 (5) where f ₁ = D ₁ × √d ₁ (6) f ₂ = D ₂ × √d ₂ (7) where D ₁ and D ₂ are the warp and weft density of the fabric (pieces / inch)
Where d ₁ and d ₂ are the fineness (denier) of the yarns that make up the fabric
Indicates. When the sum of f ₁ and f ₂ is 1000 or less, the increase in the cross-sectional area of the yarn due to water swelling contributes little to the shrinkage of the woven fabric, so that the inter-single fiber porosity A does not satisfy the formula (1). Structural shrinkage of the fabric is unlikely to occur. When the sum of f ₁ and f ₂ is 2,500 or more, the woven structure is very honey, so that the water swelling of the single fiber is substantially suppressed, and as a result, the inter-single fiber porosity A is expressed by the formula (1 ), The shrinkage of the fabric is suppressed.

Porosity A between single fibers is 90% like woolen yarn.
In the above cases, the structure of the woven fabric is very unstable, and defects such as chalk marks occur, which significantly impairs the commercial value. Therefore, the inter-single fiber porosity A is preferably less than 90%.

The method for producing a shrink-proof fabric according to the present invention basically comprises a first step of immersing the fabric in a liquid (swelling agent) having a high swelling ability for the regenerated cellulosic fibers, and a stress of the fabric during the swelling. A second step of promoting swelling by heating or the like under a low elongation ratio equal to or lower than the first inflection point strain of the strain curve, and a third step of treating the fabric with a deswelling agent. Examples of the swelling agent used in the first step include aqueous solutions of alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, quaternary ammonium hydroxides such as tetramethylammonium hydroxide and ethyltrimethylammonium hydroxide. Examples thereof include an aqueous solution, ethylene glycol, dimethyl sulfoxide (DMSO), dimethylformamide (DMF), an aqueous zinc chloride solution, and water. The second step for promoting swelling may be carried out at a temperature and for a time sufficient for the swelling agent used in the first step to swell the regenerated cellulose, and is omitted when the swelling is rapid and sufficient at room temperature. You may. If the temperature is excessively high in the second step, the action of a deswelling agent occurs and a sufficient swelling effect cannot be obtained.

For example, in the first step, DMS is used as a swelling agent.
When O is used, the treatment at 80 ° C. to 130 ° C. is suitable, and the treatment at 100 ° C. to 130 ° C. is more preferable because the treatment can be performed in a short time. When the temperature is lower than 80 ° C, the swelling of regenerated cellulose by DMF does not occur sufficiently, and
When the temperature is 0 ° C. or higher, the action of the deswelling agent is likely to occur and a sufficient swelling effect cannot be obtained. The third step is a step of treating the swelling agent from the woven fabric by heating, depressurizing or the like, or leaving it in an atmosphere having a saturated vapor pressure of the swelling agent or less. Treatment is preferred. If the swelling agent used in the first step is difficult to remove by heating or depressurizing, the swelling agent may be replaced with another liquid that is easy to remove, and this liquid may be removed.

In the more preferred method for producing a shrink-proof fabric of the present invention, processing conditions (conditions such as type and temperature of swelling agent to be used) are selected so as to satisfy the above formula (4). At that time, when the swelling ratio y is 0.1 or less, the swelling ability of the swelling agent is small, and voids between single fibers which can impart shrinkage resistance to the treated woven fabric cannot be formed. When it is 4.0 or more, extreme swelling causes dissolution of the surface of the monofilament, which lowers the woven fabric strength and the texture becomes coarse and hard, which is not preferable.

In the present invention, it is desirable to carry out all the steps under low elongation conditions. Specifically, the first inflection point strain of the stress-strain curve of the woven fabric, that is, the stress of the woven fabric during swelling -In the strain curve, it is preferable to perform the stretching at a stretch ratio equal to or lower than the strain at the point where the tangent of the portion where the stress sharply increases intersects with the strain axis. In the second step or the third step, it is needless to say that it is carried out under a low elongation condition and it is desirable to apply a kneading action, for example, a microwave dryer, a beating dryer using hot air, an air flow (air flow). ) Particularly good results can be obtained by using a dryer or an impact dryer.

As an example of such a series of treatments, the case where an aqueous sodium hydroxide solution is used as a swelling agent will be described in detail. First, as the first step, 1 wt% to 10 wt
% Sodium hydroxide aqueous solution for 5 seconds or more. 1
If the aqueous solution of sodium hydroxide is less than wt%, a sufficient swelling effect cannot be obtained in a short time, which is disadvantageous in terms of productivity. In the case of an aqueous solution of sodium hydroxide exceeding 10 wt%, excessive swelling occurs, and the treated fabric becomes unstable. The first step is preferably carried out under a low elongation condition, and a processing machine such as a Hineken type processing machine, a processing machine having a vibration effect, or a tensionless jet dyeing machine is used. Since the swelling ability of the 1 wt% to 10 wt% sodium hydroxide aqueous solution against regenerated cellulose is rapid and sufficient at room temperature, the second step can be omitted. Then, by thoroughly washing with water, the aqueous sodium hydroxide solution as a swelling agent is replaced with water that is easily removed by heating,
In the third step, 60 ° C to 180 ° C, preferably 80 ° C to 1
By drying at 20 ° C., a woven fabric having good shrink resistance can be obtained. If the temperature is lower than 60 ° C, the drying speed is slow, which is disadvantageous from the viewpoint of productivity. Further, if the treatment is performed at a high temperature of 180 ° C or higher, the cellulose molecular chain is broken,
The strength of the fabric is reduced.

As a processing method for treating a cellulosic fabric with an aqueous sodium hydroxide solution, mercerizing is widely known. However, as described in “Practical knowledge of processed textiles (edited by the National Textile Industry and Technology Association, published by the Textile Newspaper Publishing, page 1961124)”, mercerizing is mainly applied to cotton fabrics at 24 ° Be (18
%) Or more, preferably 31 to 35 ° Be (25 to 30%)
The aqueous solution of sodium hydroxide is applied to the woven fabric, and the fabric is glossed by sufficient tension by a method of sufficiently stretching after stretching at least the first inflection point strain of the stress-strain curve of the woven fabric, and then imparting gloss to the fabric. Further, it is a processing method for improving the dyeability, and its purpose, constitution and effect are completely different from those of the present invention. In addition, caustic treatment may be performed before scouring to accelerate desizing of the woven fabric. In this method, since the woven fabric is tensioned, the desizing promotion effect and the dyeability can be improved, but the shrinkproof property obtained by the low elongation treatment, which is the object of the present invention, cannot be obtained.

Further, in the present invention, particularly good results are obtained when the treatment with the swelling agent and the treatment for reducing the cross-sectional area increase rate of the single fiber at the time of water swelling are used together. In this case, after the treatment with the swelling agent, the treatment for reducing the cross-sectional area increase rate of the single fiber at the time of water swelling is performed,
Better results are obtained. The most practical method for reducing the cross-sectional area increase rate due to water swelling is a resin processing method in which the intermolecular chains of the cellulosic fiber are crosslinked with a resin or the intermolecular resin is filled with a resin. In this case, compared with the case where the resin processing alone imparts the shrink resistance, a sufficient amount of the shrink resistance can be imparted even with a low resin amount. In this case, a non-formalin-based resin finishing agent such as N, N'-dimethyl-dihydroxyethyleneurea or an amino-modified silicone showing flexibility and smoothness, which is adsorbed to the fiber by an amino group and exhibits a shrink-proof / wrinkle-proof effect. Is preferred. A low formalin-based resin finishing agent such as N, N'-dimethoxymethyl-dihydroxyethyleneurea may be used. Even in that case, since a small amount of resin processing agent is used, the amount of formalin generated is extremely small compared to the conventional shrink-proofing treatment, and the strength is not significantly reduced and the texture is not changed.

[0021]

The present invention will be described in more detail with reference to the following examples, but it goes without saying that the present invention is not limited to these examples. The physical properties were evaluated by the following methods. (1) Washing shrinkage rate: According to JIS-L-1042 household washing machine method (G method), after washing once for 5 minutes, rinsing for 2 minutes and dehydration for 30 seconds were performed twice to obtain the shrinkage rate. It was (2) Amount of free formalin: It was determined by JIS-L-1041 acetylacetone method (method B). (3) Strength of woven fabric; Examples 1, 6, 7 and Comparative Example 1,
Since the woven fabrics obtained in Nos. 2 and 5 were medium-weight fabrics mainly for outerwear, the tear strength was determined by the JIS-L-1018 pendulum method. Since the woven fabrics obtained in Examples 2 to 5 and Comparative Examples 3, 4 and 6 are thin fabrics mainly for lining, the Martindale abrasion method was adopted. To evaluate the abrasion strength, a carded cloth was used as the base cloth, and the change in appearance when rubbed 20000 times was graded in 6 stages of ring and 1 to 5. The larger the series, the greater the wear strength.

Example 1 In Example 1, the warp viscose rayon filament yarn (1
Using 20d) / weft viscose rayon spun yarn (30 cotton count), desizing, scouring and dyeing were performed according to a conventional method to obtain a sample. It was dipped in a 3% sodium hydroxide aqueous solution at 50 ° C for 30 seconds while being stretched by 1% in the length direction and 4% in the width direction, neutralized with an acetic acid aqueous solution of pH 3, and then at 50 ° C. It was thoroughly washed with water and dried using a pin tenter. This is a non-formalin resin processing agent (Fixapret NF manufactured by BASF) 10%, a catalyst (BASF
Condensol 2451) (manufactured by Condensol Co., Ltd.) is dipped in a treatment bath containing 3%, squeezed with a mangle having a pressure of 5 kg / cm ² , and 6% in the lengthwise direction and 1% in the widthwise direction after the alkali treatment.
Using a pin tenter with 100% stretch applied,
It was pre-dried at 1 ° C for 1 minute and further heat-treated at 160 ° C for 3 minutes.

[0023]Comparative Example 1 In Comparative Example 1, the same fabric as that used in Example 1 was
Formalin-based resin finishing agent (Fixap manufactured by BASF)
ret NF) 10%, catalyst (BASF Conde Conde
nsol 2451) immersed in a treatment bath containing 3%,
Pressure 5Kg / cm ²After squeezing with the mangle of
As a dimension, it stretches 14% in the length direction and 4% in the width direction.
1 minute at 100 ℃ using a pin tenter
It was dried and further heat-treated at 160 ° C for 3 minutes.

Comparative Example 2 In Comparative Example 2, the same woven fabric as that used in Example 1 was prepared by adding 10% of a low formalin type resin processing agent (Unicale Resin GS-15 manufactured by Unica Giken) and a catalyst (Catalyst M manufactured by Unica Giken).
C-109) 3% was used for resin processing in the same manner as in Comparative Example 1.

Example 2 In Example 2, a taffeta of cupraammonium rayon 75d / weft 100d after desizing, scouring and dyeing was prepared,
After being stretched by 1% in the length direction and 6% in the width direction, it was immersed in a 5% aqueous sodium hydroxide solution at 20 ° C for 30 seconds, neutralized with an aqueous acetic acid solution at pH 3, and then at 50 ° C. After thoroughly washing with water and alkali treatment using a pin tenter, the product was dried at 100 ° C. for 2 minutes in a state in which it was stretched by 1% in the lengthwise direction and 1% in the widthwise direction with the original size.

Example 3 In Example 3, the woven fabric obtained in Example 2 was resin-processed. The resin processing was performed in the same manner as in Comparative Example 1 except that the elongation during processing was 1% in the length direction and 1% in the width direction with the original size after alkali treatment.

Example 4 In Example 4 as well, the fabric obtained in Example 2 was resin-processed. For resin processing, 5% of low formalin type resin processing agent (Unical resin GS-15 made by UNIKA GIKEN) and 1.5% of catalyst (catalyst MC-109 made by UNIKA GIKEN) are used. 1% in the length direction,
The same method as in Comparative Example 1 was used except that the width was 1%.

Comparative Example 3 Comparative Example 3 is the same as Comparative Example 1 except that the same woven fabric as that used in Example 2 is stretched by 2% in the length direction and 6% in the width direction. Was processed with resin.

Comparative Example 4 Comparative Example 4 was the same as Comparative Example 2 except that the same woven fabric as that used in Example 2 was stretched during processing by 2% in the length direction and 6% in the width direction. Was processed with resin.

Example 5 In Example 5, the same woven fabric as that used in Example 2 was prepared and stretched with 2% in the length direction and 6% in the width direction to give dimethyl sulfoxide. After soaking for 3 minutes, it was heated at 80 ° C. for 5 minutes using a pin tenter, and further heat-treated under reduced pressure at 10 mmHg and 90 ° C. for 3 minutes.

Examples 6 and 7 In Example 6, viscose rayon (warp filament yarn,
Weft-spun yarn, 102d / 30 cotton count) was prepared, and was positively driven open soap, dipped in 4% sodium hydroxide aqueous solution at 50 ° C. for 30 seconds, and then neutralized with pH 3 acetic acid aqueous solution. Further, the product washed with water was desized and refined according to a conventional method. This was dyed by an ordinary cold pad batch method, washed with a positive drive type open soaper, and dried with a pin tenter. This is a non-formalin resin processing agent (Fixapret manufactured by BASF).
NF) 10%, catalyst (BASF Condenso
1 2451) immersed in a treatment bath containing 3%, pressure 5
After squeezing with a Kg / cm ² mangle, it is dried for 1 minute at 100 ° C. using a shrink surfer made by Hirano Techseed,
Cylinder heating was further performed at 160 ° C. for 3 minutes. Example 7
Was carried out in the same manner as in Example 6 except that the dyeing was carried out by the atmospheric pressure jet dyeing method.

Comparative Examples 5 and 6 Comparative Examples 5 and 6 were treated in the same manner as Comparative Examples 1 and 3 except that the resin processing solution was water. The results of measuring the physical properties of the obtained woven fabrics are shown in Tables 1 and 2 of Examples 1, 6, and 7 and Comparative Examples 1, 2, and 5.
Table 2 shows Examples 2 to 5 and Comparative Examples 3, 4, and 6. As is clear from these tables, it is possible to impart a practical shrink-proof property by the method of the present invention, and by using in combination with a treatment for reducing the cross-sectional area increase rate of the single fiber at the time of water swelling represented by resin processing, It may be provided with shrink resistance. Thus, the present invention has a remarkable effect.

The results of measuring the physical properties of the obtained woven fabrics are shown in Tables 1 and 6 for Examples 1, 6 and 7 and Comparative Examples 1, 2 and 5, and Table 2 for Examples 2-5 and Comparative Examples 3, 4 and 6. Indicated.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

INDUSTRIAL APPLICABILITY The regenerated cellulosic fiber shrink-proof fabric according to the present invention is dipped in a liquid (swelling agent) having a high swelling ability for regenerated cellulosic fibers, and then swelled to a specific swelling ratio by heating or the like. Specific interfiber voids are formed in the fabric by promoting and then treating the fabric with a deswelling agent. By controlling the woven structure in this way, it is possible to obtain a shrink-proof woven fabric that does not generate formalin and retains the same strength as that before the shrink-proofing process. The regenerated cellulose-based fiber shrink-proof woven fabric according to the present invention can also be imparted with particularly good shrinkability when used in combination with a process such as a resin process for reducing the diameter increase rate of the single fiber upon water expansion.

Claims (2)

[Claims] 1. A porosity A between monofilaments in a warp and a weft of a woven fabric and a cross-sectional area increase rate x of the monofilaments when swollen in water defined by the following formula (3) are expressed by the following formulas (1) and ( Within the range specified in 2), the single fibers are composed of threads that are not bonded to each other, and the cover factors f ₁ and f ₂ of the warp and weft of the woven fabric are within the ranges of the following formulas (4) and (5). A shrink-proof woven fabric comprising regenerated cellulosic fibers. A ≧ {1-0.94 / (1 + x)} × 100 (%) (1) 0.1 <x <1.6 (2) x = (S _w −S ₀ ) / S ₀ (3) ) 1000 <(f ₁ + f ₂ ) <2500 (4) 0.5 <(f ₁ / f ₂ ) <2.0 (5) where f ₁ = D ₁ × √d ₁ (6) f ₂ = D ₂ × √d ₂ (7) However, S ₀ is the _value obtained when left in an atmosphere of 20 ° C. and 65% RH for one day, that is, the cross-sectional area of single fiber in the state of maintaining the equilibrium moisture content, and _Sw is It is the cross-sectional area of a single fiber when immersed in water at 20 ° C. for 1 hour and sufficiently swollen. Also D ₁ ,
D ₂ is the warp and weft density (books / inch) of the fabric, d ₁ and d ₂
Is the fineness (denier) of the yarns that make up the fabric. 2. When producing a shrink-proof woven fabric from a woven fabric composed of regenerated cellulosic fibers, the woven fabric is represented by the following formula (9):
The swelling ratio y between the swelling of the monofilament with water and the swelling agent by the swelling agent is soaked in the swelling agent under the selected processing condition that the swelling ratio y is within the range of the following formula (8), and the regenerated cellulose fiber is A method for producing a shrinkproof woven fabric comprising regenerated cellulosic fibers, which comprises a step of treating after swelling with a deswelling agent. 0.1 <y <4.0 (8) y = (S _s −S _w ) / S _w (9) However, the single fiber cross-sectional area when immersed in the S _s swelling agent for 1 hour, or S _w Is the cross-sectional area of a single fiber when immersed in water at 20 ° C. for 1 hour.