JPS648099B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soft, bulky and stretchable woven or knitted fabric, and a method for producing the same.

Synthetic rubber-like elastic yarns are widely used in woven and knitted fabrics that require stretchability in order to take advantage of their elongation recovery properties, and some knitted fabrics in which bare yarns containing only synthetic rubber-like elastic yarns are used. Except for , it is often used as a twisted yarn with nylon yarn or spun yarn.

However, due to manufacturing constraints, it is necessary to align the spun yarn and the drafted synthetic rubber-like elastic yarn and twist the yarn in the same direction as the original twist of the spun yarn. You can get it by twisting it. Therefore, the extra-twisted spun yarn inhibited the elasticity of the resulting yarn, and the yarn was also unfavorable in terms of texture.

Therefore, the most commonly used manufacturing method is to combine two spun yarns, align them with the drafted synthetic rubber-like elastic yarn, and twist them in the opposite direction to the original twist of the spun yarns. ing. Since the yarn thus obtained is twisted together with two spun yarns, it inevitably has poor elasticity and lacks soft texture.

On the other hand, as a method for weaving and knitting by combining a special thread that easily dissolves in water or a solvent and an elastic thread, the following method can be mentioned.

First, there is a method of weaving and knitting by combining or twisting water-soluble strong polyvinyl alcohol-based synthetic fiber yarns with high elasticity synthetic fiber yarns, setting them with a water-soluble sizing agent, and temporarily eliminating the high elasticity. (Jikko 40-25716).
Of course, in this method, the strong polyvinyl alcohol-based synthetic fiber yarns are combed after weaving and knitting, so the highly elastic synthetic fiber yarns remain bare in the woven or knitted fabric, and the woven or knitted fabric does not have a good feel.

Next, there is a method in which the elongation of the elastic yarn is temporarily suppressed by placing soluble fibers along the elastic yarn, and then covering this with inelastic synthetic fibers, and then removing the soluble fibers by melting (Japanese Patent Publication No. 40-24942 ).

According to this method, since the surface of the elastic yarn is covered with inelastic synthetic fibers, the former disadvantage does not occur, but since the inelastic synthetic fibers are fixed in a fixed direction with regular twisting, Moreover, the resulting woven or knitted fabric has a hard texture and lacks bulk. In addition, since the method requires a considerable amount of time and effort to cover the inelastic synthetic fibers, it cannot be said to be a practical method.

The present invention solves the drawbacks of such conventional woven and knitted fabrics, and also solves the operational difficulties in the manufacturing method thereof, and provides a bulky stretchable woven and knitted fabric that is soft to the touch, bulky, and highly elastic, and a method for manufacturing the same. The purpose is to provide To this end, the present invention has the following configuration. That is, the present invention comprises a staple fiber group and a synthetic rubber-like elastic yarn, and the staple fiber group is woven or knitted with untwisted yarn arranged so as to cover the synthetic rubber-like elastic yarn in a substantially untwisted state. A bulky stretch woven knitted fabric, a spun yarn, a drafted synthetic rubber-like elastic yarn, and an easily soluble yarn are aligned, and the spun yarn is twisted in a direction opposite to the original twisting direction of the spun yarn until the spun yarn becomes substantially untwisted. The gist of the present invention is to provide a method for producing a bulky stretchable woven or knitted fabric, which is characterized in that the obtained twisted yarns are used to weave and knit a woven or knitted fabric, and then easily soluble yarns are eluted and removed. . The present invention will be explained in detail below.

In the present invention, the bulky stretchable woven or knitted fabric is woven with untwisted yarn in which the staple fibers are arranged so as to cover the synthetic rubber-like elastic yarn in a substantially untwisted state. It is very important to do so. This is because the staple fibers are untwisted and coated with synthetic rubber-like elastic yarns, making it possible to obtain bulky and stretchable woven or knitted fabrics that are soft and pleasant to the touch, unlike when they are actually twisted. It is from. Staple fibers include natural fibers such as cotton, wool, and linen, synthetic fibers such as polyester fiber, acrylic fiber, nylon fiber, and benzoate fiber;
Examples include semi-synthetic staple fibers and blended fibers thereof. Synthetic fibers and semi-synthetic fibers include staple fibers obtained by various cutting methods such as equal length cutting and burr cutting.

Next, as the synthetic rubber-like elastic thread, for example, a polyurethane elastic thread or polyester consisting of a long chain synthetic polymer in which the bonding portions between monomers or the bonding portions between basic base polymers are mainly urethane bonds. Examples include elastic threads. and,
The synthetic rubber-like elastic thread preferably has a thickness in the range of 10 denier to 200 denier. Kedashi, 10
If it is less than the denier, the waist tends to disappear,
Moreover, it is difficult to lead to bulkiness, and on the other hand, if it exceeds 200 denier, it becomes difficult to sufficiently cover the synthetic rubber-like elastic yarn even when the staple fiber group is in an untwisted state.

Here, a method for manufacturing such a bulky stretch woven or knitted fabric will be explained based on the drawings. Note that the drawings are for illustration purposes only, and modifications are permitted as long as the spirit of the invention is not lost. The figure is a side view of a yarn twisting machine which is an example of a device for carrying out the present invention.

In the figure, spun yarn A and easily soluble yarn C are unwound from cheese 1 and cheese 2, respectively, and are supplied to a pair of rollers 6. 11 and 12 are guides. In addition, as the staple fibers constituting the spun yarn A used here, those already described are used. The spun yarn A preferably has a thickness of 10.S to 60.S (English cotton count). 10, S
If it is less than 60.S, the spun yarn A is too thick and the resulting yarn will be unfavorable in terms of texture and bulk.On the other hand, if it exceeds 60. It is undesirable due to quality problems such as bulkiness and bulkiness. In addition, the easily soluble thread C refers to a thread that is easily dissolved or decomposed by water, a solvent, or high heat, such as a water-soluble vinylon thread that dissolves in water, an alkali thread that easily dissolves in an alkaline solution, etc. Easily soluble polyester yarns, low-melting fiber yarns that easily dissolve at high temperatures, etc. may be mentioned, and they may be in the form of filament yarns or spun yarns. Incidentally, since this easily soluble yarn C must be eluted and removed later, a filament yarn is preferable for this purpose, and a filament yarn is more preferably in the range of 5 denier to 50 denier. On the other hand, the synthetic rubber-like elastic thread B is unwound from the package 3 through the rollers 4 and 5, and preferably has a diameter of 1.5 to 5
The paper is supplied to a pair of rollers 6 while being drafted at a double draft magnification. This draft magnification is selected based on the elongation recovery characteristics necessary for a woven or knitted fabric, and is preferably 1.5 times or more to provide stretch and is preferably 5 times or less to provide a soft texture. Note that the method for aligning these yarns is different from the method shown in the figure, in which the drafted synthetic rubber-like elastic yarn B and the easily soluble yarn C are tied together (by twisting or by twisting with a fluid). ), this may be aligned with spun yarn A.

These yarns are then travelled in the direction opposite to the original twist until the spun yarn A becomes substantially untwisted, preferably 80% to 90% of the original twist of the spun yarn A. 9, the bobbin 8
be wound up. 10 is a package, and Y is a plied yarn. This is because the easily soluble yarn C is eluted and removed after it is made into a woven or knitted fabric, and the staple fibers constituting the spun yarn cover the surface of the synthetic rubber-like elastic yarn B, almost aligned in the yarn axis direction. It is. Therefore, it is preferable to untwist to 80% to 90% of the original twist. If it is less than 80%, the untwisting will be insufficient and the untwisting will be a little lacking, and if it exceeds 90%, the untwisting will be too much and the softness will tend to be lacking.

Further, the thus obtained twisted yarn is woven into a suitable woven or knitted fabric, and then the easily soluble yarn is eluted and removed.

As described above, according to the present invention, a soft, bulky, and stretchable bulky elastic woven or knitted fabric can be produced very easily, and this bulky elastic woven or knitted fabric is woven with substantially non-twisted yarn. It is stretchy and soft to the touch, making it particularly suitable for baby underwear.

Examples Spun yarn A is 30/1 of 100% cotton fiber, S (twist number 23T/in, Z twist), synthetic rubber-like elastic yarn B is 40 denier (elongation 450%, tenacity 1.5 g/denier) ) polyurethane elastic yarn, easily soluble yarn C
Using an alkali easily soluble polyester yarn (30 denier/10 filaments) as
It was twisted and wound up to 19.6T/in. In addition, the synthetic rubber-like elastic thread B has a tension of 2.5 between rollers 5 and 6.
Drafted double. This twisted yarn has a warp density of 35/
A plain woven fabric with a weft density of 35 strands/in was woven. Furthermore, this fabric was treated with an alkaline aqueous solution containing 5 wt % sodium hydroxide to elute and remove the alkali easily soluble polyester yarn. The plain woven fabric, which is covered with substantially untwisted cotton fibers, is bulky, soft to the touch, and elastic, and has been popular as a fabric for infants.

[Brief explanation of the drawing]

The figure is a side view of an apparatus for carrying out the invention. A: Spun yarn, B: Synthetic rubber-like elastic yarn, C: Easily soluble yarn, 6: A pair of rollers.

Claims (1)

[Scope of Claims] 1 Consisting of a staple fiber group and a synthetic rubber-like elastic yarn, the staple fiber group is woven or knitted with untwisted yarn arranged so as to cover the synthetic rubber-like elastic yarn in a substantially untwisted state. Bulky stretch woven and knitted fabric. 2. The bulky stretchable woven or knitted fabric according to claim 1, wherein the synthetic rubber-like elastic thread is a polyurethane elastic thread having a thickness of 10 to 200 deniers. 3. The spun yarn, the drafted synthetic rubber-like elastic yarn, and the easily soluble yarn are aligned and twisted in the opposite direction to the original twist of the spun yarn until the spun yarn becomes substantially untwisted. A method for producing a bulky stretchable woven or knitted fabric, which comprises weaving and knitting a woven or knitted fabric using the obtained twisted yarns, and then eluting and removing easily soluble yarns. 4. The method for producing a bulky stretchable woven or knitted fabric according to claim 3, wherein substantially no twisting is 80% to 90% of the original twist of the spun yarn, which is opposite to the twisting direction of the spun yarn. 5. The method for producing a bulky stretchable woven or knitted fabric according to claim 3 or 4, wherein the synthetic rubber-like elastic yarn is a synthetic rubber-like elastic yarn having a thickness of 10 denier to 200 denier.