JPS609934A - Production of hard twisted yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A0 Technical Field of the Invention The present invention relates to raw yarn used in strong cotton knitted fabrics with excellent grain expression ability and surface unevenness effect. More specifically, it is a crimped yarn having a wavy or coiled crimped structure in which the single fibers constituting the multifilament are mostly bundled together by twisting.

This invention relates to a raw yarn for strong cotton yarn made by compositely pliing and twisting ordinary drawn polyester multifilament yarns.

B. Prior art and its problems Conventionally, real yarn with a strong twist, yarn with a temporary twist, etc. have been used as the yarn with a surface unevenness effect. Using a strong cotton yarn with a real twist has excellent graining ability and has excellent drapability, firmness, and crispness, but the biggest drawback is that it is prone to cracks and horns because it is a real twist. Ta.

In order to improve these shortcomings, for example,
As proposed in Japanese Patent Application Laid-open No. 23619 and Japanese Patent Application Laid-open No. 10640/1984, heat treatment is strengthened during the production of raw yarn to thermally stabilize the internal structure of the yarn and reduce graininess and texture. There are known ways to improve it. However, even this method has the problem that the above-mentioned cracks and horns are likely to occur.

C0 Purpose of the Invention In order to improve such conventional drawbacks, the present invention uses yarns that are tightly bundled and crimped by twisting at the tip as one component, and ordinary stretching as the other component. By blending the yarns at the composite ratio defined in the text and then subjecting them to a real twist to make a 1-strength yarn, it has no cracks, cracks, or horns, has a high ability to express grain, and has excellent drapability. The purpose is to obtain a good yarn for strong cotton.

D0 The twist coefficient of multifilament yarn of the present invention is -4300 to 86
00 has a twist at the tip, and most of the constituent units are integrated wavy or coiled crimped yarns.

On the other hand, as yarn A, a drawn polyester multifilament yarn with a diving shrinkage rate of 21 or more was prepared,
A method for producing strong cotton yarn, characterized in that the yarns A and A are combined and strongly twisted at a composite ratio defined by the following formula (a) and at a twist coefficient of 20,000 or more.

1 11111≧025 ・・・・・・・・・・・・・・・
...-(a) A, +A.

(However, the unit is based on weight).

E0 Effects of the present invention The effects of the present invention will be explained with reference to the drawings.

Figure 1 shows the crimped yarn A1 used as a component of the present invention.
This is a diagram showing the appearance of the front part.

Even after the temporary twisting process, the total length of the 99 individual convergence parts is at least 1m! It exists with a length of 125% or more, and its converging part is the unresolved part at the end mentioned above. This unresolved part may be continuous or intermittent as long as it is within the above range.

Furthermore, "at least 1 rn" refers to a unit length of 1 rn or more, and does not indicate a shorter length such as number = or number -. This converging part of 25 inches or more is the unresolved part of the previous direction, and this is the first direction coefficient of = 4300 ~ β
However, since most of the single fibers that make up the yarn are crimped in the same direction, most of the single fibers are crimped in the same direction by heat treatment. This is because they bend in the same direction. In other words, when the yarn is coated with strong fibers and used as a weft for fabrics.

Since the warp threads can be pressed and bent with great force, large grains can be created.

On the other hand, in the bundled part with a length of 25 1 mm combs, that is, the unresolved part, the bundle is insufficient, and the crimp force of each single fiber is the same in a disjointed state. However, each single fiber develops crimps in different directions, so even if this yarn is coated with strong fibers and used as a weft yarn for textiles, the graininess is very small. Therefore, satisfactory graininess cannot be obtained. Furthermore, the yarn A1 of the present invention has a shrinkage rate of 6 when subjected to diving treatment.
It is preferable that the number is 5 or more. The shrinkage rate due to diving treatment is determined by the measurement method proposed by Jarley Research Institute (
"Filament Processing Technology Manual" [Volume 2] p18.
This is the value obtained using the method published by the Japanese Society of Textile Machinery Engineers. If this value is 65 or more, the graininess improves.
This is preferable from the viewpoint of preventing the formation of cracks and horns. on the other hand,
All conventional textured yarns can only obtain values of less than 6° and 5 inches.

Further, the crimped yarn Fi of the present invention is preferably a woolly yarn. Woolly yarn refers to yarn that has not been subjected to a second heat set after being subjected to a temporary twisting process. This is because receiving the second heat set is undesirable because the torque decreases.

Furthermore, the yarn A of the present invention has a wavy shape in an integrally bundled state.
Alternatively, the yarn may have a coiled crimped structure.6 By adopting such a structure, it is possible to increase torque expression as a yarn.

Next is Yarn A! is a typical melt-spun polymer material.

For example, it includes polyester or copolymerized polyester, and if necessary, additives such as pigments, lubricants, and stabilizers are mixed therein.

The spinning of the present invention is carried out using a normal melt spinning machine, and the cross-sectional shape of the fibers does not necessarily have to be oval.
It may also have an irregular cross section. Further, if necessary, a composite cross section made of different polymers may be used. In particular, the spinning temperature of yarn A used in the present invention varies depending on the polymer material used, but is preferably in the range of 170°C to 300°C.

The obtained undrawn yarn is preferably drawn under the following conditions.

The heat setting conditions applied at this time are important requirements for obtaining yarn A, a yarn applicable to the present invention, having a water-saving shrinkage rate of 2 inches or more. Specifically, FIG. 2 shows yarn A of the present invention,
It is a process diagram showing the manufacturing process for obtaining.

The undrawn yarn 1 obtained as described above is subjected to hot drawing under normal conditions in a drawing zone 2.

Subsequently, a tensioning or relaxing heat treatment is performed in the heat setting zone 6. The heat setting conditions that can be adopted in the present invention are such that the hot plate temperature in the heat setting seam 73 is 70° C. or more, preferably 180° C. or less. By adopting such conditions, the orientation and crystallinity of the yarn are actively promoted, a remarkable change is caused in the internal structure, and the desired submerged shrinkage rate of 2 cm or more is obtained. It is possible to easily and rationally produce the raw yarn component yarn A for strong cotton fabric with excellent graininess without having to significantly change the conventional apparatus.

The yarn A of the present invention obtained as described above and yarn A are twisted and twisted at a composite ratio defined by the following formula (a) and used. In this case, if the composite ratio of both components is 0.25 or less, this is the object of the present invention. Horn.

It is difficult to obtain raw yarn for strong cotton fibers that have no ground cracks and have good grain stand and grain quality.

A.

-> 0.25・・・・・・・・・・・・・・・
(a) A, +A, = Next, the twist coefficient of the mixed fiber yarn mixed at such composite ratio = 2
[1, [) [) After applying the actual twist strength of o or more.

Twisting prevention treatment is performed using moist heat at 65°C to 100°C.

By forming the strong cotton yarn into a fabric and then subjecting it to graining treatment using the washer graining method, it is possible to obtain a strong cotton fabric with no cyranoids or ground cracks and with good graining properties and grain quality. It is possible.

According to the findings of the present inventors, the strong cotton yarn of the present invention has a high internal structure of crystallinity and is mainly composed of yarns with good graining properties. It is a disorder caused by excess. 0 or 1 normal drawn yarn that has the role of reducing kinks, horns, cracks, etc. For A, those with a submerged shrinkage rate of 2% or more are mixed fiber yarns with a composite ratio defined in the text as a twist coefficient - With a strength of over 20,000,
For those below the fabric range, the graininess is flat and a high quality product cannot be obtained. First, as a means for converging the filament yarns, it is important to apply a general real twist before the m-shrinking process.11 A down twister or a double twister is usually used. However, simply subjecting the yarn to twisting and strengthening is not suitable for producing the yarn of the present invention. That is, it is necessary to create a part that tightly converges the crimp so that the directionality of the crimp is not lost, including workability in the primary twisting process and weaving process, process conditions, and even the final product.

If this convergence part is weak and insufficient, the only thing that can be obtained is a crimped yarn that is no different from a normal crimped yarn.

In order to achieve this purpose, we conducted a thorough study on the number of twists and turns as a means of focusing, and found that the range of -4500 to 8,600 for the twist coefficient is the most preferable number of twists that meet this purpose. Found out: If the twist coefficient in this case is less than 4300, an integrated crimp-focused structure cannot be obtained. In other words, the single fibers remain in a fibrillated state and only unresolved fibers like syspots remain, and a wavy or coiled crimped structure cannot be obtained. On the other hand, twist coefficient = 8
When the number is 600 or more, the integrated crimped structure becomes extremely good, but the convergence part, that is, the unresolved part, becomes noticeable.

If a strong cotton yarn is used as the mixed fiber composite yarn, it is not preferable because it will not result in a textured fabric with a false twist effect, which is the object of the present invention. For this reason, it is preferable that the number of twists is within the above-mentioned range.

Next, the tip is twisted to create a yarn that is a bundle of single fibers.

A conventional crimping device may be used as a means for providing a wavy crimped structure. That is, temporary twisting processing, pressing processing, gear clamp processing, etc. can be used, but if a fine grain is required, it is better to perform the processing at a processing temperature of 200"C or higher. Also, the multifilament yarn used in the present invention is used. Yes, spinning speed 5000 m/min
It includes all the yarns obtained by the above-mentioned high-speed spinning and the yarns obtained by ordinary spinning and drawing. Further, in order to improve workability, the yarn may be pre-interlaced.

The crimped yarn A of the present invention has excellent crimp ability, while the normal drawn yarn 1 has inferior crimp strength compared to the former, but has an excellent shrinkage force of 9. Because it has the ability to uniformly develop the unraveling of strong cotton yarn, these two characteristics are well balanced when graining occurs, resulting in a uniform, high-quality product without the conventional problems of kinks, horns, and cracks. A product with a soft texture can be obtained.

In addition, in the present invention, it is possible to obtain graininess and grain quality equivalent to that of silk fabrics, which has not been possible in the past.

Next, an explanation will be given using an example.

Example 1 Polyester multifilament yarn of g/clI', 7
5D-36f irregular cross section yarn to twist coefficient = 21DO~1
Change it to 0.000 and thread it with a down twister.

Various types of threads were made.

These were subjected to temporary twisting under the following conditions.

Processing temperature: 210°C Spindle rotation speed: 300,000 rpm Processing speed: 88 m/min Added feed rate: +3% Number of temporary twists: 3400 T/M In addition, yarn A2 was partially oriented polyester multi-fin membrane (POY) using a normal melt spinning machine. The yarn was spun at a spinning speed of 3,500 m/min to have an irregular cross-sectional shape. Subsequently, one different stretching hot plate temperature (0
By heat setting the yarn at a temperature of 160 DEG C.), drawn yarns 75D-36f having various ladder ratios were obtained.

Next, the former polyester multifilament crimped yarn A, (75D-56f).

Both of the latter drawn polyester multifilament yarns A and (75D-36f) with different submerged shrinkage ratios were drawn and mixed at a composite ratio of 0.5, and then the twist coefficient was set to 2.
It was coated with 8,000 yen strength cloth and subjected to moist heat treatment at 80°C for 40 minutes to prevent twisting. After that.

These strong cotton yarns are used as weft yarns for warp and yarn 50D-'5
6f polyester thread, weaving density is 150 vertically 72.5
The fabric was woven with a length of 4 cm, 68 wefts, and 72.54 cm, and was embossed using a washer. The evaluation results are shown in Table 1.

As is clear from the comparison results of level L-25 in Table 1,
It has become clear that in order to obtain a yarn with a diving shrinkage rate of 60 or more of A1 unresolved crimped yarn, the tip twist coefficient must be equal to or higher than 4360.

On the other hand, the graininess of the yarn mixed with yarn A2 component.

It was found that for grain quality 1 quality, the upper limit of the front twist coefficient is up to -8600.

Further, as can be seen from Table 1, the submerged shrinkage rate of the yarn A of the present invention is the wrinkle shrinkage rate and grain quality of the fabrics of levels 1 to 26 obtained by subjecting the blended yarn with the yarn A1 to high-strength processing.

As is clear from the texture, it was found that the drawn yarn needed to have a submerged shrinkage rate of 2 inches or more.

Example 2 Yarn A is a normal polyester multifilament drawn yarn, 30D-12f, 40D-18f and 50D-
56f was shown in Example 1. Processing was carried out under the same conditions as the pre-fold crimping process to obtain a pre-fold crimped yarn.

In addition, as yarn A, partially oriented polyester multifilamen (POY) was spun at a spinning speed of 3500 m/min using a normal melt spinning machine to produce joOD-4sf, 11 DD-48f and 120 yarns with irregular cross-sectional shapes.
D-48f was spun. Next, yarn A1 component and yarn A2
Both components were drawn and mixed on the i plateau shown in Table 2, then the twist coefficient was multiplied by 28.000, and the fibers were heated at 80°C.
A moist heat treatment to prevent twisting was performed for 40 minutes. These strong cotton yarns were used as weft yarns, and the warp yarn usage, weaving density, and crimp conditions were conducted in accordance with Example 1. The evaluation results are shown in Table 2. As is clear from the levels 26 to 28 in Table 2, it is necessary for the mixed fiber composite ratio to be 0.25 or more in terms of the nine graining properties, and if it is less than that, the graining property is insufficient.

The woven fabric made of the yarn of the present invention thus obtained has delicate grains that cannot be obtained with conventional strong linen woven fabrics.

A textured fabric with a soft texture comparable to that of a silk fabric was obtained.

[Brief explanation of drawings]

FIG. 1 shows a model diagram of a crimp yarn according to the present invention. FIG. 2 shows a schematic diagram of an apparatus for producing drawn yarn according to the present invention. 1: Undrawn yarn 2: Stretched seam 7 3: Heat treatment zone Patent applicant: Toshi Co., Ltd.

Claims (1)

[Claims] fil yarn A, birefringence Δn>90x10. ! A polyester multifilament yarn with a yarn density of >1.365g/♂ is twisted at the tip with a twist coefficient of ≠4300 to 8600, and most of the constituent units are integrated wavy or coiled crimped yarns, while Yarn A. Prepare a drawn polyester multifilament yarn with a submerged shrinkage factor of 2 or more, and have the yarns A1 and A at a composite ratio defined by the following formula (a), and have a twist coefficient of 20, 1. A method for producing a strong cotton yarn characterized by twisting and twisting at a strength of 000 or more. 1 □≧0.25・・・・・・・・・・・・・・・・・・
(a) A, ten A. (However, the unit is based on weight).