JPS61179334A - Composite false twisted processed 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] (Industrial Application Field) The present invention relates to a composite false-twisted yarn, and more specifically, it has good post-processability, vivid dyeability, less sliminess, and is soft. This invention relates to a composite false-twisted yarn that has bulkiness and excellent texture.

(Prior Art) Multifilament yarns for clothing generally have the disadvantage of lacking a cold feel or a particularly slimy feel compared to spun yarns. Bulky textured yarns such as crimped yarns and loop textured yarns are known as multifilament yarns that have these drawbacks. Furthermore, in order to develop even more bulkiness, it is possible to feed multiple yarns at different feeding rates during false twisting, or to use raw yarn that exhibits yarn length differences during false twisting, and to create sheath yarns around the core yarn. False-twisted yarns wound in alternating twists are also well known.

However, these multifilament processed yarns that have been known so far have poor bulkiness, the loops of the multifilament yarns become entangled, which hinders unwinding and post-processing properties, and the multifilament yarns have different yarn lengths. The processed yarn made of multifilament has a problem called fluffiness.

Furthermore, it is difficult to obtain bright dyeability when using regular polyester fibers for multifilament processed yarns with long yarn lengths, and in order to further improve dyeability, we copolymerized an ionic dyeable substance. Alternatively, blended polyester fibers have poor bulkiness and low crimp properties, making them more likely to cause bulkiness. Although nylon 6 and nylon 66 have excellent bright dyeing properties, their slimy feel became a problem.

(Problems to be Solved by the Invention) The present invention improves the drawbacks of the conventional composite false twisted yarn, namely, it does not have a slimy or bulky feeling, is soft and bulky, and has a good texture. An object of the present invention is to provide a composite false-twisted yarn that can be dyed well and vividly and has no problems in unwinding properties, knitting and weaving properties.

(Means for Solving the Problems) The present invention has the following configuration to achieve the above object. That is, the present invention provides a composite false-twisted yarn having a core-sheath structure in which sheath yarns are alternately wound around a core yarn in the form of a twisted yarn, and which has a false-twist crimp. The composite false twisted yarn is composed of multifilaments, and the filaments of the multifilaments constituting at least the sheath yarn are nylon 46 fibers.

In the present invention, the filaments constituting the sheath yarn are made of nylon 4
6 fiber is essential.

Nylon 46 fibers have rarely been used for clothing, but when used in the filaments that make up the sheath yarns of this condensed false-twisted yarn, they have a smoother texture than nylon 6 fibers or nylon 66 fibers. It does not have the slimy feeling that is characteristic of polyamide fibers, and can be dyed with the vivid coloring properties of polyamide fibers.

Although the reason for this is not clear, nylon 46 has better hygroscopicity than nylon 6 and nylon 66.
At 65% R11, the moisture content of Benylon 46 is much higher at 6.4% compared to 40% for nylon 6 and 48% for nylon 66, which is considered to be one of the reasons for the crisp feel.

Furthermore, plasticization in water is small, such as JIS method (L
1013) (constant speed elongation type tensile tester) The change in elongation at break between the standard state and the wet state is also the same as the dry 4
Compared to 2% → 53% wet, nylon 46 has a dry rate of 45% → 48% wet, which means that bending in wet conditions such as underwater or sweating is much smaller, and it can be used in wet conditions, which was a problem with nylon 6 and nylon 66. This significantly improves the health of people.

The reason for making it into an alternately twisted yarn shape is to improve the cohesiveness and, in turn, improve post-processability. It is also essential to have false twist crimp. By having false twist crimp,
It is bulky and unlike other non-torque crimped yarns, it consists of individual filaments.

In addition, in this condensed false-twisted yarn, sheath yarns are alternately twisted around the core yarn, so polyester fibers tend to become rough and stiff, and the Young's modulus of the filaments is also high, making it difficult to unwind. Problems tend to occur, and for this reason, the filament denier has been made thinner, but polyamide fibers do not have such problems, so if the desired filament denier is too soft or too large, it tends to become coarse and hard. △ The fineness (denier) of the filaments that make up the sheath yarn is 0
．． 5 to 3 denier is preferred, more preferably 0.8 to 3 denier.
It is 2.5 denier.

Next, the material of the multifilament constituting the core yarn may be used depending on the purpose, but nylon 46 is preferable in terms of stretchability, dyeability, softness, etc. This is especially because the same material has fewer yellow rays caused by dyeing and provides a brighter color.

Although there is some irritation due to dyeing, nylon 66 and nylon 6 are preferably used in terms of elasticity, bulkiness, softness, and bright color. Furthermore, polyester fibers can also be used to utilize different dyeing properties or to emphasize dry touch.

Nylon 46 fiber that provides these properties has a repeating unit in the molecular chain of 70 mol% or more +NH-(CH,)
A polyamide fiber consisting essentially of poly(tetramethylene adipamide) composed of 4-NHCO-(CH, ), -Go-), an ε-capramide component, a hexamethylene adipamide component, and a hexamethylene A copolymer of 30 mol% or less of a copolymer component such as a terephthalamide component or an undecamethylene terephthalamide component, or a polymer consisting of these, i.e., poly(ε-capramide),
It may also contain a blend of poly(hexamethylene adipamide), poly(hexamethylene terephthalamide), poly(undecamethylene terephthalamide), etc. in an amount of 30% by weight or less.

In addition, matting agents, pigments, light stabilizers, heat stabilizers, antioxidants, antistatic agents, dyeability improvers, adhesion improvers, etc. can be added as necessary, and depending on the combination, the Pores on the sides of the filament, which have a significant negative impact on the properties of the invention
If the amount exceeds % of the yarn having grooves, the shape as a core/sheath structural yarn will be unclear and the characteristics of the present composite false twisted yarn will not be exhibited, so it will be excluded from the present invention. For the same reason, the sheath yarn needs to have at least 10 filaments, preferably 12 or more.

Next, the present invention will be explained based on the drawings.

FIG. 1 is a schematic diagram of the composite false twisted yarn of the present invention. In the figure, A is a multifilament that constitutes a core yarn, and B is a multifilament that is alternately twisted around the core yarn A with inverted parts E and F opposite each other to form a sheath yarn.

FIG. 2 is a schematic side view of an apparatus for producing the composite false twisted yarn of the present invention. It should be noted that this figure shows an example of a manufacturing apparatus, and of course is not limited to this.

A is an undrawn or semi-drawn multifilament with a lower elongation than the multifilament B, and B is an undrawn multifilament of nylon 46 spun at a normal spinning speed. If the elongation difference between the unstretched or semi-stretched multifilament A and the semi-stretched nylon 46 multifilament B is large, it will become somewhat coarse and hard, but the winding will be strong.
On the other hand, if the difference in elongation is small, the winding will be incomplete, but the texture will be soft, so it may be selected appropriately depending on the application. The difference in elongation of i1 is preferably 150 to 300%.

The multifilaments A and B pass through their respective guides 1 and are brought together at the focusing guide 2, and between the feed roller 3 and the draw roller 4, they are drawn together with the multifilament B at a stretching ratio that is lower than the appropriate drawing ratio for A, which has low elongation. Stretched.

Here, 5 is a hot pin and 6 is a hot plate. Then, false twisting is performed using a heater 8 between the draw roller 4 and the delivery roller 7, and a false twisting spindle 9. Here, the multifilament B, which is nylon 46 with high elongation, has a lower false twisting tension than the multifilament A, which has less elongation, so the number of twists around the multifilament A changes according to the tension of B. In the false twisting spin, the twist is over-untwisted and the twist in the untwisting direction remains.
The composite false twisted yarn of the present invention has a form as shown in FIG. 1, and is wound into a package C driven by a take-up roller 10.

If necessary, the yarn may be twisted using a ring twister or the like for winding, or may be twisted in a separate process.

Furthermore, the multifilaments A and B may be twisted and/or interlaced and then drawn, twisted and/or interlaced after being drawn, or interlaced after drawn and false-twisted. .

(Examples) Example 1.2 In Examples 1 and 2, composite false twisted yarns of the present invention were obtained by processing using the apparatus shown in FIG. 2 using the materials, denier, and processing conditions shown in Table 1.

Note that the difference in elongation between the core yarn and the sheath yarn was 250%.

Comparative Examples 1 and 2 are intended to clarify the differences from the present invention. Nylon 6, nylon 6B, and polyester fibers were manufactured using known methods, but nylon 46 fibers were manufactured using nylon 4B chips with a relative viscosity of 2.5 at a spinning temperature of 310°C, as shown in Table 1. An undrawn yarn was produced at a spinning take-off speed of .

Example 1 is an example in which nylon 4B fibers are used for both the core yarn and the sheath yarn, and since the nylon 46 fiber constitutes the sheath yarn, it does not have the slimy feeling that polyamide fibers have, and has good moisture absorption and is soft. The result was a product that had a gentle feel but a crisp texture. Furthermore, both the core thread and sheath thread are nylon 411.
Although there was some dyeing due to differences in the spinning conditions, it was hardly noticeable, and moreover, vivid dyeing properties as a polyamide fiber were obtained, and post-processability was also good.

Example 2 is the same as Example 1 except that nylon 6B is used for the core yarn, and although there is some irritation due to the difference in dyeability between the core yarn and the sheath yarn, the dyeability as a polyamide fiber is maintained almost as is. , and other characteristics were the same as in Example 1 and were well received.

Comparative Example 1 was the same as Example 1 except that nylon 6 was used for the sheath yarn, but compared to nylon 4G, nylon also had some problems.

Comparative Example 2 is an example in which polyester was used for both the core yarn and the sheath yarn, and the dyeability of the polyester fiber was only somewhat dull, and there was also a problem in unwinding property, probably due to the high Young's modulus. Ta.

In addition, the texture in the table is evaluated through sensory tests mainly based on slimy and fluffy sensations, and those with no slimy feeling are ◎
, Slightly present was rated ○, and those with a slimy feel were rated ×.

Dyeability was evaluated by tube knitting.

Excellent stainability was rated as 0, good stainability as 0, and poor stainability as X.

In addition, the bulkiness was evaluated by tactile sensation of the tube knitting described above, with ◎ indicating bulkiness, ○ indicating slight bulkiness.
The one with poor bulkiness was marked with x. Post-processability was rated as good by ○ and poor by Δ. In Example 1.2, the crimped sheath yarn was firmly fixed to the core yarn in the form of alternately twisted yarns, and the post-processability was good.

Table 1 (Effects of the Invention) As described above, the composite false-twisted yarn of the present invention has good post-processability and excellent bright dyeability, is soft and bulky without feeling slimy, and has excellent texture. It has the remarkable effect of becoming something.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the composite false twisted yarn of the present invention;
The figure is a schematic side view of an apparatus for manufacturing the composite false twisted yarn of the present invention. A: Multifilament constituting the core yarn B: Multifilament constituting the sheath yarn 3: Feed roller 4 Ni draw roller 8: Heater 9: Preliminary combustion spindle 7: Delivery roller Patent applicant Toyobo Co., Ltd. No. 12 E F 2 Ward

Claims (1)

[Scope of Claims] A composite false-twisted yarn having a core-sheath structure in which sheath yarns are alternately twisted around a core yarn and having false twist crimp, the composite false-twisted yarn comprising a plurality of composite false-twisted yarns. 1. A composite false-twisted yarn characterized in that the match filament constituting at least the sheath yarn is made of nylon 46 fiber and is made of a real multifilament.