JPH01156529A - Polymide different shrinkable blended fiber yarn - Google Patents

Abstract

PURPOSE: To prepare a polyamide heterogeneously shrinking combined filament yarn capable of giving soft feeding to a fabric by subjected low shrinkage nylon filament and high shrinkage nylon filament each giving a specific hot-water shrinkage factor and elongation to a mixed spinning process. CONSTITUTION: Nylon filaments are divided into the group 1A and the group 1B, and for example, one of them is direct spun drawn yarn and the other is high speed spun drawn yarn. Thus, the hot-water shrinkage factor and elongation of each of the filament groups 1A and 1B are individually controlled. They are entangled by an interlacer 5 and wound up. The low shrinking filament A and the high shrinking filament B have hot-water shrinkage factors of 9% or less and 10% or more, respectively, and the difference of the hot-water shrinkage factors between A and B is 4% or more. The elongation of the filament A is 60-90%, and that of the filament B is 25% or more and less than 60%, and then difference of both the elongation is 50% or less.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides high shrinkage properties by blending low-shrinkage nylon filaments and high-shrinkage nylon filaments with a specific hot water shrinkage rate and elongation. The present invention relates to a polyamide-based differentially shrinkable mixed fiber yarn that is given a texture and texture.

[Conventional technology] Polyamide fibers, represented by nylon, have many features such as good strength, elongation, and abrasion resistance, as well as excellent dyeability with acid dyes, and their uses are wide-ranging. It spans. However, if a multifilament yarn made by simply bundling a single type of polyamide fiber filament is used, a fabric with good drapability and resilience cannot be obtained. In other words, polyamide multifilament yarn like the one above has a smooth surface.
When made into a fabric, it has a so-called "slimy feel" and has the drawback that it feels cold and it is difficult to obtain a fabric that satisfies covering properties and heat retention.

As a means to improve the drawbacks of polyamide multifilament yarns, we developed two yarns with different heat shrinkage rates.
Different shrinkage mixed fiber yarns have been developed that are made by doubling polyamide filaments to give them bulkiness and a sense of swelling.

[Problems to be Solved by the Invention] The method for producing the above-mentioned polyamide-based differentially shrinkable mixed fiber yarn is as follows: - Normally, polyamide filaments are used as low-shrinkage filaments; is a method of blending filaments using materials with reduced crystallinity and high shrinkage through copolymerization, etc. ■Usually polyamide filaments are used as high shrinkage filaments, while low shrinkage filaments are made even lower shrinkage by relaxing heat treatment. A method is known in which the fibers are mixed using a material that has been treated with a certain amount of carbon.

However, in the method (2) above, crystallinity must be sacrificed to some extent in order to obtain highly shrinkable filaments, and as a result, the quality of the mixed fiber yarn deteriorates and the feel of the fabric cannot be sufficiently improved. On the other hand, in method ■ above,
The addition of a relaxing heat treatment to obtain a low shrinkage filament reduces productivity and increases equipment and operating costs.

The present invention has been made in view of these circumstances, and its purpose is to eliminate the need for special treatment such as relaxation heat treatment on the constituent filaments, and to provide a structure in which each filament has a high level of physical properties. The purpose is to use a polyamide-based heteroshrinkable mixed fiber yarn that has good bulk and can give a soft feel to the fabric.

[Means for Solving the Problems] The composition of the mixed fiber yarn of the present invention that can achieve the above object is made by mixing low-shrinkage nylon filament A and high-shrinkage nylon filament B, The gist is that both filaments A and B satisfy the following relational expression.

A (SHW)≦9%...(
1) B (SHW) 210%...
・(2)B (SHW)-A (SHW) ≧4
%...(3)90%≧A (DE) 260%
...(4) 25%≦B (DE)<60
%...(5)A (DE)-B, (DE)
550%...(6) [Function] The present inventors have repeatedly conducted various studies in an attempt to resolve the difficulties seen in conventional polyamide-based differentially contractible mixed fiber yarns.
It has been confirmed that by using nylon as a raw material and employing the following series of spinning, drawing, and blending methods, it is possible to produce high-quality heteroshrinkable mixed fiber yarns that meet the purpose of the present invention with high productivity. Ta.

That is, for example, as schematically illustrated in FIG. 1, a group of nylon filaments 1 are spun from a number of spinning nozzles (not shown).
is divided into two groups IA and IB, and one filament group IB is passed through the first guide roller 2, which rotates at a relatively low but relatively high speed in absolute terms, and then rotated at a higher speed, e.g. Direct spinning and drawing is performed by passing the filaments through a second guide roller 3 that rotates at a high speed of about 3,500 m/min or more, and for the other filament group IA, the filaments that have been cooled after exiting the spinning nozzle are passed through a second guide that rotates at a high speed. High-speed spinning is performed by passing the fiber directly through the rollers 3. In the figure, 2a and 2b indicate front rollers.

Then, by changing the rotational speed of the first and second guide rollers 2 and 3, the spinning and drawing conditions are well adjusted.
If the hot water shrinkage rate and elongation of each filament group IA and IB are adjusted to meet the requirements shown in equations (1) to (6) above, the former of these filament groups IA and IB has low shrinkage. The filament and the latter have the properties of a highly shrinkable filament. Then, the mixed fiber yarn which is interlaced with the interlacer 5 and wound up via the third guide roller 4 becomes a very excellent yarn that meets the above-mentioned purpose. Moreover, the low shrinkage filament IA and the high shrinkage filament IB that constitute the differentially shrinkable mixed fiber yarn
Since the fibers are produced simultaneously in a series of spinning and drawing processes that are performed in parallel and then mixed continuously, productivity is also significantly increased. In the diagram, 6 is traverse, 7 is wine goo, 8
indicates cheese respectively. However, the above production example is merely an example, and the method for producing low-shrinkage nylon and high-shrinkage nylon is not a requirement that limits the present invention. Nylon constituting the mixed fiber yarn of the present invention includes nylon-6 and nylon-66, and among these, nylon-6 is particularly preferred.

Elongation A of the low shrinkage filament IA produced in this way
(DE) is less than 60%, the heat shrinkage rate A (SHW) of the filament IA cannot be 9% or less, and the high shrinkage filament I
In order to increase the heat shrinkage rate of B to higher than that of low-shrinkage filament IA, it is necessary to use nylon copolymerized with other materials as the material, and the decrease in crystallinity makes it difficult for mixed fiber yarns. It becomes impossible to achieve satisfactory properties. On the other hand, low-shrinkage filament IA with an elongation A (DE) exceeding 90% causes too much elongation after winding up, causing the fabric to become distorted or have many loops, making it impractical. .

On the other hand, the elongation B (DE) of the high shrinkage filament IB is 25
If the elongation B (DE) is less than 60%, not only will the texture of the mixed yarn deteriorate, but continuous operation will be difficult due to frequent yarn breakage during the drawing process.If the elongation B (DE) exceeds 60%, hot water shrinkage will occur. The ratio B (SHW) becomes less than 10%, and the filament cannot function as a highly shrinkable filament.

Also, the difference in hot water shrinkage rate of filaments IA and IB ΔSHW
If [=B (SHW) - A (SHW)] is less than 44%, the difference is insufficient, and the mixed yarn will not swell sufficiently, making it impossible to obtain a woven or knitted fabric with high bulkiness. Furthermore, the elongation difference ΔDE [=A (DE
)-B (DE)] h<s.

%, even if there is a small tension fluctuation during the weaving or knitting process, sink marks (a phenomenon in which the yarn is partially stretched, creating a difference in gloss and causing defects in the fabric) are likely to occur, and uniform woven or knitted fabrics may not be produced. You won't be able to get it.

[Example] Using nylon-6 with an RV (relative viscosity) of 2.50,
Melt extrusion was performed through a 48-hole nozzle at a spinning temperature of 275°C, and after cooling, stretching and winding were performed under various conditions according to the winding layout shown in FIG. Of the filament group spun from the 48' hole, 24 filaments are passed directly to the second guide roller 3 to be drawn at high speed (A yarn), and the remaining 24 filaments are passed from the first guide roller 2 to the second guide roller 3. The filament group is directly spun and drawn (B yarn) by the second guide roller 2, and the filament group is joined by the interlacer 5.
After mixing the fibers, the fibers were passed from the third guide roller 4 to the wine goo 7 and wound into cheese 8. The yarn denier after final winding was adjusted to 70 denier, and the elongation and hot water shrinkage of each mixed yarn were measured. The results are summarized in Table 1 along with the experimental conditions.

In addition, taffeta with a weave density of 192 yarns/inch was made using each of the mixed fiber yarns obtained above, and the texture of each yarn was evaluated. The results are shown in Table 2.

(Margins below) 1~Pa (・ 1′ l 1f de -I Table 2 O: Good △: Slightly good ×: Bad From Table 1.2, it can be considered as follows.

Experiment No. 2.3.6: This is an example that satisfies the specified requirements of the present invention, the bulkiness is good, the fabric has an excellent texture, and there is no sink and the weaving efficiency is also good. It is being

Experiment No. 1: Elongation B of high shrinkage filament (
DE) is too small and the elongation difference ΔDE is too large, and wire breakage occurs frequently in the taffeta weaving process, making it impractical.

Experiment No. 4: Hot water shrinkage rate B of high shrinkage filament
This is a comparative example in which (SHW) is small and the shrinkage rate difference ΔSHW is also insufficient, and the bulkiness of the blended yarn is insufficient, making it impossible to obtain a satisfactory texture.

Experiment No. 5: Elongation A (D
This is a comparative example in which E) exceeds 90% and the elongation difference ΔDE exceeds 50%, which not only causes sink marks but also reduces the weaving efficiency due to partial elongation of the low shrinkage filament during weaving. low.

Experiment Nos. 7 and 8: Comparative examples in which the hot water shrinkage rate or elongation of the low-shrinkage filament or the high-shrinkage filament was outside the specified range, and the bulkiness was insufficient in all cases, resulting in poor taffeta feel.

[Effects of the Invention] The present invention is constructed as described above, and blends Z fl type nylon filaments obtained by high-speed spinning and direct spinning drawing and whose hot water shrinkage rate, elongation, and the difference thereof are specified. By fiberizing, it is possible to provide a polyamide-based differentially shrinkable mixed fiber yarn that exhibits bulk and excellent texture, has good weaving workability, and can be manufactured with high productivity. Ta.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an example of manufacturing a differentially shrinkable mixed fiber yarn according to the present invention. 1, IA, IB...Filament group 2...First guide rollers 2a, 2b, 2c...Front roller 3...Second guide roller 4...Third guide roller 5...Interlacer 6...Traverse 7...Wine Goo
8...Cheese;()...-〆ichimi I~ Chiku 1 diagram

Claims (1)

[Claims] Consisting of a mixture of low-shrinkage nylon filament A and high-shrinkage nylon filament B, both filaments A,
A polyamide-based heteroshrinkable mixed fiber yarn, characterized in that B satisfies the following relational expression. A(SHW)≦9%...(1) B(SHW)≧10%...(2) B(SHW)-A(SHW)≧4%...(3) However, A(S
HW) means the hot water shrinkage rate of filament A, and B(SHW) means the hot water shrinkage rate of filament B, respectively. 90%≧A(DE)≧60%…(4) 25%≦B(DE)<60%…(5) A(DE)-B(DE)≦50%…(6) However, A(DE) The elongation of filament A and B (DE) mean the elongation of filament B, respectively.