JPH06306764A - Chemical fiber-synthetic fiber composite web - Google Patents

Abstract

PURPOSE:To provide a chemical fiber-synthetic fiber composite web improved in draping property and in irregular dyeing, having good bulkiness and soft touch, and having good stiffness, good resilience and proper strength. CONSTITUTION:The chemical fiber-synthetic fiber composite web comprises acetate fibers A and synthetic fibers B such as polyester fibers, the acetate fibers being saponified in a saponification degree of >=50% (acetyl groups), holding >=90% of the strength held before saponified, being mixed with the synthetic fibers in an order of single fibers, while forming fine spaces F, and forming a multi-layered structure in which the acetate fibers are projected in such states A1-A3 as to be dispersed on the side surfaces of the synthetic fibers in different projection widths, thus substantially covering the synthetic fibers with the acetate fibers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compound fiber composite fabric, and more particularly to a fabric such as rayon-like woven fabric and knitted fabric using a yarn in which acetate fibers and synthetic fibers are composited.

[0002]

2. Description of the Related Art Acetate fibers have advantages such as natural feel and hygroscopicity of cellulose fibers, and clear dyeability, which are difficult to obtain with synthetic fibers, but have a low Young's modulus, and therefore, when used as a fabric. There is no waist resilience in
It has a drawback that the strength is low, around 2 denier, and it is difficult to make thin denier yarns, and various efforts have been made to improve these drawbacks.

For example, a method of using synthetic fibers in various forms is known for and (Japanese Patent Publication No. 43-21102, Japanese Patent Publication No. 45-3301, and Japanese Patent Publication No. 46-46). No. 7218, Japanese Patent Publication No. 33-100
25, Japanese Patent Publication No. 36-10511, etc.).

[0006] However, while these drawbacks have been improved to some extent in the drawbacks such as, they have created another new problem. That is, synthetic fibers have a large bending hardness and are easily heat-shrunk in the dyeing process, whereas acetate fibers have a large surface friction coefficient, so that the contact pressure between the yarns in the fabric increases and the friction force increases. Is likely to become large, and the suppleness and drape of the fabric may be impaired, repulsion and wrinkle resistance may be impaired, and stains may easily occur due to the difference in dyeability between acetate fiber and synthetic fiber. There is.

On the other hand, the above has not been improved so far. That is, since the acetate fiber has a low strength of 1.2 to 1.6 g / de, it is presumed that if the single fiber denier becomes thin, it becomes difficult to handle in the manufacturing process and other commercialization processes.

[0006]

SUMMARY OF THE INVENTION The present invention aims to improve the above-mentioned drawbacks of the prior art, and reinforces the waist resilience and strength, which are the drawbacks of acetate fibers,
Further, the present invention provides a highly sensitive fabric which is improved in the drape property and dyeing unevenness, which are the defects of the fabric using the conventional acetate fiber / synthetic fiber composite yarn, and which is also imparted with bulkiness and soft feel.

[0007]

SUMMARY OF THE INVENTION The present invention is a fabric made of a yarn composed of acetate fiber and synthetic fiber, wherein the acetate fiber is saponified with 50% or more of the acetyl groups in the acetate molecule. The strength of the acetate fiber before saponification is 90% or more, and
Synthetic fiber is covered with synthetic fibers with microscopic voids on the order of single fiber, and the synthetic fiber is substantially covered by forming a multilayer structure in which acetate fibers are dispersed on the side surface of the synthetic fiber with different overhang amplitudes. The present invention provides a synthetic fiber composite fabric characterized by being

The present invention will be described in detail below. That is, what is the aim of the present invention? a) having the feel of cellulose fiber that has been familiar to humans for a long time, b) having waist repulsion and moderate strength that cellulose fiber alone cannot provide.
c) To have high drape, bulkiness and soft texture of fine denier and sharp dyeing properties of acetate fiber, which cannot be obtained with a conventional cloth using acetate fiber / synthetic fiber composite yarn.

For this reason, first, in order to satisfy a) and b), a yarn is prepared by combining acetate fibers and synthetic fibers having a Young's modulus and a strength higher than that, to make a fabric. However, this alone has the same contents as the conventional improvement measures, and of course, c) is not satisfied, so the inventors have made earnest studies on this solution, and have found the following solution.

That is, it has been found that, by subjecting the above-mentioned cloth to a special alkali weight reduction treatment, it is possible to satisfy not only a) and b) but also c). Alkaline weight loss in the art is usually applied to a synthetic polyester fiber and a part of the polyester fiber, specifically, 1
It is a processing method that mainly improves the texture such as drape by melting and thinning about 0 to 30%, but the alkali weight loss here is completely different, and the synthetic fiber side such as polyester is almost The acetate fiber is saponified with an alkaline aqueous solution without being dissolved, and the volume of the acetate fiber is reduced by the saponification.

Further, at this time, generally used conditions for alkali weight reduction treatment of polyester fiber, that is, sodium hydroxide is used as an alkaline substance, and it is immersed in an alkaline aqueous solution having a sodium hydroxide concentration of 35 g / l and a temperature of about 97 ° C. Under these conditions, the acetate fiber significantly deteriorates in strength and cannot be put to practical use. Therefore, if further intensive study is conducted and the strength deterioration is suppressed to about 10% or less, an appropriate strength can be maintained and It was found that a new combination of processing conditions, that is, the processing in the hatched area shown in FIG. 4, should be performed.

In other words, this makes it possible to reduce the weight by about 40% while maintaining the strength of the acetate fiber at 90% or more. Although the weight reduction mechanism is different, the same drape improvement effect as that of the polyester fiber can be obtained. In addition to being obtained, the single fiber denier can be thinned to give a fine soft touch, or the hygroscopicity can be greatly improved because the acetate is made into rayon.

Next, a specific example will be described with reference to the drawings. FIG. 1 shows an example of an apparatus for producing a yarn in which acetate fibers and polyester fibers are compounded. That is, between the supply roller 1 and the drafting roller 2, an acetate multifilament A having a boiling water shrinkage of 1% and a polyester multifilament B having a boiling water shrinkage of 15%.
In the state where the yarns are mixed with each other, the both are stretched while being mixed and bent by the bending and opening guide 7 so that only the multifilament of acetate is drawn off and the take-off nozzle 4 having a suction force is continued.
Then, the multifilament of polyester fiber and the chopped short fibers of acetate were mixed and composited in a single fiber order as shown in FIG. The yarn C is obtained and wound around the pan D by the ring twisting device 6.

Next, the yarn C thus obtained is twisted, and is woven using the warp and weft to form a fabric,
Then, this cloth is scoured and relaxed, then preset and heated to about 97 ° C. and boiled with sodium hydroxide 3 g / l.
The acetate fiber is saponified by immersing it in an aqueous solution having a concentration of about 25 minutes to reduce the weight of the acetate fiber by about 40%. Next, this fabric is dyed with a disperse dye, then again dyed directly with a dye, and further subjected to finishing setting, whereby the fabric of the present invention can be obtained.

The cloth of the obtained product E is, as shown in the cross-sectional form in FIG. 3, a polyester fiber B and a rayon-like fiber A obtained by saponifying an acetate fiber, which are mixed and combined in a single fiber order. The rayon-like fibers A project from the side surface of the polyester fiber B in a state of being dispersed with different overhang amplitudes like A ₁ , A ₂ , and A ₃ to form a multi-layer structure, and have a structure in which the polyester fiber is substantially covered. ing.

Further, since most of the acetyl groups in the acetate molecule of the acetate fiber are saponified therein, the weight ratio is reduced by about 40% and the thickness of the fiber is thin. Along with the shrinkage difference between the fibers and the polyester fibers, fine voids are formed between the constituent single fibers F and between the fabric structures G, and the binding force due to friction between the single fibers and between the fabric structures is reduced.

Due to these effects, the obtained fabric E is
Natural cellulose feel, waist repulsion, drape,
It has bulkiness, soft texture, moderate strength, vivid and uniform color, etc. Also, due to rayonization of acetate, hygroscopicity is greatly improved. It has become a thing.

Here, as the acetate fiber A, there are diacetate fiber and triacetate fiber, and there are various single fiber denier, gloss, and cross-sectional shape, all of which are appropriately selected according to the intended product. You can use it. However, as for the single fiber denier, when the denier of 3 denier or less is used, it is reduced by about 40% by saponification treatment to 1.8 denier or less, which is even thinner than the minimum denier of commercially available acetate fiber. A fabric with an ultra-soft texture that has never been obtained can be obtained.

This is because it is expected that the acetate fiber will have a low strength even if the yarn-forming technology advances in the future and a finer denier yarn is produced at present, so that it will be difficult to handle in the production process. It is an effective means from the viewpoint of manufacturing technology that the product can be made into a fine denier after it has been made into a product, as in the invention, in which the product has passed through the process of commercialization in a relatively thick denier state.

The synthetic fiber B to be combined with the acetate fiber is not particularly limited as long as it has a larger Young's modulus and a higher strength than the acetate fiber and a large boiling water shrinkage ratio, such as polyester, acrylic, nylon and others. However, the polyester type is the most suitable because the main purpose is to impart the waist resilience. Further, as the single fiber denier, 1.5 denier or more is optimal.

Further, in order to impart the cellulose feel and bulkiness of the acetate fiber to the finished cloth and to cover the synthetic fiber with the acetate fiber to impart the leveling property and the sharpness, a yarn composed of the acetate fiber and the synthetic fiber. It is preferable to make the fiber length of the synthetic fibers of the strip shorter than that of the acetate fibers by an average of 5% or more. For this purpose, the synthetic fibers having a boiling water shrinkage ratio of 5% or more larger than that of the acetate fibers of the composite partner are used. It is preferable. Further, it is desirable that the composition ratio of the synthetic fiber is 50% or less. In addition, the cross-sectional shape and gloss of the synthetic fiber are not particularly limited.

Further, the form of the yarn in which the acetate fiber and the synthetic fiber are combined is not limited to the combination of the short fiber and the long fiber as described above, and is shown in FIG. 2 (2) or (3). As described above, long fibers and long fibers, short fibers and short fibers, or long fibers and short fibers may be combined,
It is not particularly limited as long as it is a mixed fiber composite on the order of single fiber.

Next, weaving and knitting can be handled in the same manner as ordinary yarns, but the synthetic fibers shrink in the dyeing process and the acetate fibers are dispersed on the surface of the fabric with different overhang amplitudes. It is preferable that the number of twists and the density are designed to be slightly small so that the multi-layer structure can be easily projected.

Further, although dyeing and finishing can be handled in the same manner as ordinary acetate fibers and rayon, when alkali weight loss is handled in the same manner as conventional polyester fibers, strength deterioration and treatment unevenness occur. For,
The following precautions are necessary.

That is, as the alkaline substance, for example, sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide, ammonia or any other substance that ionizes in water to give a hydroxyl group can be appropriately selected depending on the situation. It can be used, but regarding the concentration and temperature of those aqueous solutions,
It is necessary to select the solid line shown in FIG. 4 and the area below it, preferably the shaded area.

That is, in the region above the solid line in FIG. 4, the strength retention of the acetate fiber is less than 90%, which causes a problem of practical strength deterioration. Moreover, since the time required for 100% saponification is 20 to 30 minutes or less on the upper side of the shaded area, treatment spots are likely to occur, while on the other hand, on the lower side of the shaded area, conversely 1.5 to 2 hours or more. It takes a long time, which is inconvenient for production.

Under these conditions, the acetyl groups in the acetate molecule are saponified, but it is necessary to saponify at least 50% of the acetyl groups contained, preferably the entire amount. That is, when the saponification rate is 50% or less, treatment spots are likely to occur and a clear color cannot be obtained. In addition, when the total amount is saponified, the weight is reduced by about 40%, and so-called weight reduction effect and fine denier effect can be obtained.
Compared with the alkali weight loss of polyester, the weight loss rate is easier to calculate by the calculation of the chemical formula, so that there is an advantage that the condition setting and management can be rather easy.

[0028]

The compounded fiber composite fabric of the present invention comprises 50% of the acetyl groups in the acetate molecules of the acetate fibers constituting the compound fabric.
Since the above is saponified and the single fiber denier is thin at the same time, the texture such as drape is improved, the hygroscopicity is imparted and the soft feel is imparted. Moreover, since the saponified acetate fiber retains 90% or more of the strength of the acetate fiber before saponification treatment, it has an appropriate strength.

Further, such an acetate fiber is mixed with a synthetic fiber in a single fiber order and saponified, whereby the single fiber denier becomes thin, and fine voids are generated between the constituent single fibers and between the woven fabrics. Since the frictional force between tissues and tissues is reduced, it has a high drape property and a soft texture, and synthetic fibers with a high Young's modulus are mainly located inside the fabric due to the difference in shrinkage between acetate fibers and synthetic fibers. On the other hand, acetate fibers overhang the surface of the fabric,
Since it covers synthetic fibers, it has bulkiness, waist repulsion, and clear dyeability.

[0030]

The present invention will be described in more detail with reference to the following examples. Example 1 As a acetate fiber A, a diacetate fiber spun into 75 denier / 55 filaments was used as a acetate fiber A to obtain a strength of 1.30 g / de, an elongation of 23% and a Young's modulus of 470 kg / mm ^2. Polyester fiber obtained by copolymerizing 30 denier / 12 filaments of isophthalic acid as synthetic fiber B, with a boiling water shrinkage of 1.0%, strength 4.2 g / de, elongation 43%, Young's modulus 1,13
Using 0 kg / mm ² and boiling water shrinkage of 29%, by processing under the following conditions, polyester fibers are not cut off, only acetate fibers are cut off, acetate short fibers and polyester long fibers Obtained a denier yarn of 95 denier mixed and composited in the single fiber order.

Checking length (feeding roller 1 and checking roller 2
Nip distance); 30 cm Shedding ratio (shedding roller speed / supply roller speed); 1:
18 times drafting speed (drafting roller speed); 600 m / min take-up nozzle pressure (swirl flow); 3 kg / cm ² conjugation nozzle pressure (swirl flow); 3.5 kg / cm ² conjugation overfeed rate [(slippery roller Speed-delivery roller speed) / check roller speed] x 100; 5
% Bending angle of bending guide θ: 150 ° Ring spindle rotation speed: 6,500 rpm

The physical properties of the obtained composite yarn were as follows. Yarn denier; 95 denier strength; 1.7 g / de elongation; 38% boiling water shrinkage; 25% entanglement degree; 183 k / mu%; 5.1% yarn form; polyester multifilament yarn as core, While short fibers of acetate are mixed and entangled with each other on the order of single fibers, some acetate fibers overhang from the side or fluff is formed.

Next, after twisting the composite yarn at 600 times / m, a plain weave having a vertical density of 152 threads / whale and a horizontal density of 94 threads / whale is woven, followed by a scouring relaxing step and a heat setting step. After passing, the acetate fiber is saponified by immersing it in an aqueous solution of 3 g / l of caustic soda at 60 ° C. for 60 minutes, and then the polyester fiber side is treated with a disperse dye for 120 minutes.
Dyeing was carried out at .degree. C., and then the rayon-like fiber side obtained by saponifying the acetate fiber was dyed with a direct dye at 98.degree.

In the woven fabric thus obtained, polyester filament yarns and short fibers of rayon-like fibers in which acetate fibers are saponified are mixed in a single fiber order, and the rayon-like fibers differ from the side surface of the yarn. It forms a multi-layer structure that protrudes with the fluff while dispersing with the overhanging amplitude, and covers the fabric surface with a shape that is substantially covered with polyester fiber.For this reason, a natural span-like cellulose feel, rich swelling, clear It had a uniform color.

Further, the saponification treatment reduces the amount of the acetate fibers by about 40% in weight ratio. Therefore, fine voids are generated between the fibers and the woven fabric structure, the contact pressure between them is reduced, and friction is caused. The binding force was reduced to show high drapeability, and the single fiber denier was also thinned from 1.36 denier to about 0.8 denier, so that a very soft touch was added.

On the other hand, the polyester fiber was hardly affected by the saponification treatment conditions according to the present example, and although the woven fabric was soft and had a high drape,
It also has a high waist resilience with a bending resilience of 87%, making it a fabric with extremely high sensitivity that has never been seen before.

The acetate fiber was sampled from this woven fabric to measure the strength and elongation. The strength was 1.24 g.
/ De, the elongation was 22%, and the strength retention was 95%.
The hygroscopicity, which was 4% before saponification, increased to 8%.

[0038]

EFFECTS OF THE INVENTION The compound fiber composite fabric of the present invention has a natural cellulose feel and soft and rich swelling, high drape, high waist resilience, and a vivid and uniform color appearance. However, it is possible to provide a fabric for clothing having a high sensitivity which has never been obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an apparatus for producing a composite yarn of acetate fiber and synthetic fiber necessary for producing a fabric of the present invention.

FIG. 2 is a diagram showing a form of a composite yarn of acetate fiber and synthetic fiber necessary for producing the fabric of the present invention.

FIG. 3 is a cross-sectional view of a woven fabric showing one embodiment of the fabric of the present invention.

FIG. 4 is a diagram showing an appropriate range of saponification treatment conditions necessary for producing the fabric of the present invention.

[Explanation of symbols]

A Acetate fiber B Synthetic fiber C Composite yarn of acetate fiber and synthetic fiber D Pane E Cross section of the woven fabric of the present invention A _{1 to} A _{3 of} saponified acetate fiber protruding from the side surface of the composite yarn on the woven surface with different overhang amplitudes Single fiber F Fine voids between single fibers G Fine voids between textures of cloth 1 Supply roller 2 Checking roller 3 Delivery roller 4 Air nozzle for take-up 5 Air nozzle for conjugation 6 Ring twisting device 7 Bending opening guide 8 Fly cotton suction case 9 Fly cotton suction duct 10 Checking fiber running auxiliary guide

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location D03D 15/00 D 7199-3B // D06M 101: 30 (72) Inventor Kaoru Asada Ibaraki City, Osaka Prefecture 3-4-1, Omihara Teijin Limited Osaka Research Center

Claims (4)

[Claims] 1. A fabric made of a yarn composed of acetate fiber and synthetic fiber, wherein 50% or more of acetyl groups in the acetate molecule of the acetate fiber are saponified, and the acetate fiber before saponification treatment is used. A state in which the strength of the acetate fiber is 90% or more, and it is compounded with the synthetic fiber with microscopic voids on the order of single fiber, and the acetate fiber is dispersed on the side surface of the synthetic fiber with different overhang amplitudes. The synthetic fiber composite fabric is characterized in that the synthetic fiber is substantially covered by forming a protruding multilayer structure. 2. The synthetic fiber composite fabric according to claim 1, wherein the synthetic fiber has a fiber length on average 5% or more shorter than that of the acetate fiber, and is a single fiber denier of 1.5 denier or more. 3. The synthetic fiber composite fabric according to claim 1 or 2, wherein the synthetic fibers account for 50% or less of the total composition ratio. 4. The synthetic fiber composite fabric according to claim 1, wherein the synthetic fiber is a polyester fiber.