JPS58149343A - Production of buikly blended fiber 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 The present invention relates to a method for producing bulky mixed fiber yarn,
! For details, see Latent crimpable synthetic fiber yarns and thermoplastic synthetic fiber yarns that have different heat shrinkability, and are processed under specific conditions to create span-like bulky blends. The present invention relates to a method for producing yarn.

Conventionally, synthetic fiber yarns with latent crimpability include two or more different types of polymers or the same type of poly-7-, which have different thermal histories, and have a cross section with a dorsal-ventral structure or an eccentric core-sheath structure. Composite yarns spun in this way are known. Such composite yarns are generally crimped by utilizing the difference between the shrinkage force and the heat shrinkage force. The problem with latent crimp yarns made of these composite yarns is that there are still few yarns that have a strong crimp-inducing ability that can cause crimp in the state of fabrics such as textiles and pot dishes, and their applications are limited. The crimp development process is carried out in the state of the yarn. However, since the 2-composite yarn has a weak crimp ability, it is not possible to impart elasticity to the fabric after it is made into a fabric.
Moreover, the bulkiness was insufficient, and it was not possible to impart a span-like texture. In addition to the above-mentioned composite yarns and crimped yarns made by twisting, there are also two types of fibers with different heat shrinkability.
Different shrinkage mixed yarns are known, which are a mixture of different types of yarns.

For example, this differential shrinkage mixed fiber yarn can be used for CJ during the dyeing process after being made into a woven fabric. Although it imparts bulkiness to textiles through differential shrinkage, it cannot impart sufficient bulkiness;
It was not possible to give it a span-like texture.

The present invention is intended to eliminate such conventional drawbacks, and its purpose is to provide a method for producing a spun-like bulky mixed fiber yarn having a high degree of bulk and a p-de-shaped yarn morphology. There is something to do.

That is, 9 the present invention is 1.7 x 10-49 in boiling water.
A latent crimpable synthetic fiber yarn A that exhibits a crimp count of 15 crimps/2.5C11 or more when subjected to crimp development treatment for 10 minutes under a load of /d, and a hot water shrinkage rate of 1096 to 20 % and has a hot water shrinkage rate of 5% to 1096% higher than that of the yarn A.
The gist of this is a method for producing a bulky mixed fiber yarn, which is characterized in that a mixed fiber yarn consisting of a large thermoplastic synthetic fiber yarn B is subjected to relaxation treatment under conditions that satisfy the following formula (1). be.

However, op'': relaxation rate - T: Heat treatment temperature ((e) 100≦T≦180 Sl: Hot water shrinkage rate of yarn A (!4 $2: Hot water shrinkage rate of yarn B (to) Hereinafter, nine aspects of the present invention will be described in detail.

First, in the present invention, latent shrinkable synthetic fiber yarn A is used as one yarn constituting the mixed fiber yarn.
As yarn A, a composite yarn obtained by composite spinning two types of composite components having different heat shrinkability is used. For example, two different
Any of the known composite yarns may be used, such as a combination of more than one type of polymer, a combination of the same type of polymers with different polymerization properties, or a combination of the same type of polymers with different thermal histories. Preferably, various combinations of laryamide or polyester are used. In addition, the structure of the composite thread is dorsal-ventral.

Any eccentric 8-plane structure may be used. Yarn A needs to be a yarn that develops #C crimps of 15 crimps/2.5 al or more when subjected to crimping heat treatment. A yarn that develops fewer than 15/2.5 crimps when subjected to heat treatment for crimping cannot obtain sufficient bulk.

Here, the shrinkage heat treatment is 1.7X10-4 in boiling water.
The treatment is carried out under a load of f/d for 10 minutes. Also,
The number of crimps is a value obtained by collecting a sample subjected to the above treatment on a filter paper and counting it under a load of 21 F/d after air drying.

Next, l! is the other yarn that makes up the mixed yarn! +8
As the 0T plastic synthetic fiber yarn B, a normal yarn made of a single polymer or a composite yarn similar to the yarn A can be used. Yarn B has a hot water shrinkage rate of 10% to 20g6
It is necessary to be within the range of .

If the hot water shrinkage rate of yarn B is less than 10%, the yarn A
The difference in the hot water shrinkage rate between the two and On the other hand, if it exceeds 20%.

The shadow lines of the resulting yarn become unstable, and the yarn becomes too tight and stiff, making it difficult to obtain a bulky texture when made into a fabric. Further, it is necessary that the hot water shrinkage rate of the yarn B is 5% to 10% larger than that of the yarn A. If the difference between the hot water shrinkage rate of yarn B and the hot water shrinkage rate of yarn A is less than 596, the difference in f@water shrinkage rate will be too small and a loop will be formed by yarn A in the relaxation heat treatment described later. It is difficult to obtain spun-like threads. On the other hand, if the difference between the hot water shrinkage rate of yarn B and the hot water shrinkage rate of yarn A exceeds 10%, yarn A will become too long and sag during the relaxation heat treatment described below. As a result, operability during the relaxation heat treatment may be reduced, and problems may occur during unwinding from the spool and welding to guides in subsequent steps.

The above mixed yarn consisting of yarn A and yarn B is yarn A and yarn B.
It is obtained by aII & by a known blending method, but in order to sufficiently blend the two yarns, it is preferable to mix the fibers as early as possible in the yarn manufacturing process, and practically, it is preferable to mix the fibers in the drawing process. It is preferable that the hot water shrinkage rate of the mixed yarn consisting of yarn A and yarn B is close to the hot water shrinkage rate of yarn B.

In the present invention, the above-mentioned mixed fiber yarn is subjected to a relaxation heat treatment to obtain the desired bulky mixed fiber yarn.The relaxation heat treatment conditions include the relaxation rate OF'(9), the heat treatment temperature T('C), and the blended yarn. Yarn A constituting yarn, hot water shrinkage rate of multi-filament yarn 51 (4)
, Sm(to), the condition of the above equation (1) is adopted.

In general, the shrinkage of fibers is affected by the heat treatment temperature; when the temperature is raised, heat shrinkage stress is generated, relaxation occurs in the high temperature range, and heat shrinkage stress decreases with temperature. Thermal shrinkage stress has a maximum point, but for synthetic fibers such as polyester and polyamide, the difference in heat shrinkage stress due to temperature difference is gentle at 100 to 180°C.

In addition, the appearance of crimp is affected not only by the heat treatment temperature but also by the tension state.

In the present invention, when the mixed yarn is subjected to relaxation heat treatment.

The heat shrinkability of yarn A and yarn B constituting the mixed fiber yarn is different, and yarn A with a small hot water shrinkage rate develops crimp, while yarn A with a high hot water shrinkage rate develops crimp. B shrinks significantly. The yarn A is arranged mainly around the yarn B in a crimped and open state, and a loop is formed at the crimped reversal point. Further, each single yarn of yarn A and yarn B becomes intertwined. When a composite yarn with latent crimpability is used as the yarn B, the occurrence of crimp in the yarn B is suppressed by the balance between the heat shrinkage stress and the tension state during the relaxation heat treatment, but depending on one condition, the occurrence of crimp can be suppressed. Shrinkage occurs.

In the present invention, it is necessary to perform the relaxation heat treatment under the conditions shown by the above formula (1). If the relaxation rate is too small compared to the heat treatment temperature, the yarn A cannot be crimped; If the relaxation rate is too large, the slack between yarn A and yarn B will become large, and the cohesiveness of yarn A and yarn B will deteriorate, resulting in a decrease in workability during relaxation heat treatment and in the present invention. The desired yarn cannot be obtained. In addition, the heat treatment temperature is 100'-100, which is relatively stable due to the large heat shrinkage stress.
180'c.

is preferable, if the temperature is less than 100°C, the yarn A cannot be sufficiently compressed, and if the temperature exceeds 180°C, the yarn A
The crimp expression becomes insufficient.

The bulky composite mixed fiber yarn obtained by the method of the present invention has a mixed weave of 0
Therefore, the single yarns are entangled without any interlacing or other interlacing treatment, so that the yarn can be used in subsequent steps without any problems. However, in order to obtain a more special yarn shape or to make handling in the * process more favorable, it is necessary to
It is preferable to perform twisting of about 0 to 500 T/M.

If a yarn with latent crimpability is used as the yarn B, the latent crimpability, which was suppressed during the above-mentioned relaxation heat treatment, can be brought out by the heat treatment after the fabric is made. In addition to the bulkiness and loop shape in the state, it can be made even bulkier, and the elasticity can be improved.

In the present invention, as described above, a mixed yarn consisting of a latent crimpable synthetic fiber yarn A and a thermoplastic synthetic fiber yarn B having a higher hot water shrinkage rate than the latent crimpable synthetic fiber yarn B is prepared under specific conditions. Since the yarn A is subjected to the relaxation heat treatment, the yarn A is crimped and the yarn B is shrunk, thereby making it possible to obtain a mixed fiber yarn having high bulkiness. Moreover, since Yarn B has a higher hot water shrinkage rate than Yarn A, Yarn B shrinks more than Yarn A, and a part of the crimp of Yarn A becomes a loop, creating a spun-like yarn. It can be done. Moreover, the presence of this loop-shaped crimp makes it possible to further increase the bulkiness.

In addition, in the present invention, since heat treatment is performed under low tension, the shrinkage fixation property is not very high, but there is no practical problem, and the shrinkage fixation property is comparable to that obtained by shaping methods such as knitting and denitting. A yarn having the following properties is obtained.

The hot water shrinkage rate (9) in the present invention is JIS synthetic fiber filament bulky yarn L1090.5.10. Based on hot water shrinkage rate B method.

Further, the relaxation rate OF (b) during the relaxation heat treatment is determined by the speed of the entrance roller in the contraction development step Vx (R/m1n), and the exit roller.9 The present invention will be specifically explained in Examples below.

In the Examples, the stretching/elongation ratio is a value measured by JIS synthetic fiber filament bulky textured yarn L1090.5.7° elasticity C method after hot water treatment.

Example 1 [η) 7! J(1,51 polyethylene terephthalate and [η] is 1.38 polyethylene terephthalate were composite-spun to form a dorsal-ventral structure in a ratio of 1:1. 2 undrawn yarns of 50d/18f are shown below. A mixed yarn was obtained by drawing the above undrawn yarn under the following conditions.That is, yarn A was obtained by drawing one of the above undrawn yarns at a draw ratio of 2.65 times, a hot loaf temperature of 90°C, and a hot plate temperature of 160°C. At the same time, another undrawn yarn was drawn in the same manner as above except that hot play F was not used to form yarn B, and yarn A and yarn B were drawn.
Mix it and use a drawbuster to remove the turret from the barn 75d1
A mixed fiber yarn of 56 f was obtained. Yarn A has a number of crimps of 21/2.5 (Ill) after boiling water treatment, and the hot water shrinkage rate is 6.2%, and the hot water shrinkage rate of Yarn B is 12.1. %.The hot water shrinkage rate of the blended yarn was 11.6%.The above blended yarn was processed using a Mitsubishi Kako Co., Ltd.
However, a relaxation heat treatment was performed at a spindle relaxation rate of 20% and a delivery rate of 70111/ml after crimp development, and the cheese was rolled up. The obtained yarn had extremely high bulkiness and a spun-like feel, and had a stretch/elongation rate of 24.5%.

Example 2 Polyethylene terephthalate with [η] of 1.31 and [η
] 1.41 polyethylene terephthalate at a ratio of 1:1 into a dorsal-ventral structure, an undrawn 50d/18f undrawn yarn was drawn at a stretching ratio of 2.65 times and a hot roller temperature of 90°C.
, the undrawn yarn of 50d/18f obtained by drawing at a hot plate temperature of 160°C to form yarn A, and at the same time spinning polyethylene terephthalate with [η] of 1.41, except that no hot grate was used. The yarn B was drawn in the same manner as above, and the yarn A and the yarn B were mixed and wound into a pirn using a draw twister to obtain a mixed yarn of 75 d and 156 f. Yarn A has a number of crimps of 56/2.5 cI after boiling water treatment.
It belonged to l. Yarn A.

The hot water shrinkage rate of Yarn B and mixed yarn is 7.596°1, respectively.
It was 4.6*, 13.5%. The obtained yarn was extremely bulky and had a spun-like feel, and had an elongation rate of 10.9%.

Comparative Example 1 Table 1 shows the relationship between the number of crimps and the bulkiness of the dorsal-ventral composite yarn (yarn A). According to Table 1, it is clear that high bulkiness can be obtained when the number of crimps of the composite yarn after treatment with boiling water is 15/2.53 or more.

Incidentally, yarn B was a composite yarn having the same structure as yarn A.

Table 1 (Note) 'PET: /Lyethylene terephthalate○
: Very good Δ : Good × : Bad Comparative example 2 The undrawn yarn used in Example 1 was stretched to form yarns A and B with various hot water shrinkage rates, and the relaxation rate OF + @ heat treatment temperature T
Table 2 shows the results of bulky mixed fiber yarns obtained by varying the hot water shrinkage rate of (C), Yarn A, and Yarn B ($1 (9)) and the shrinkage.

Table 2 [Note] O: A rating of very good Δ: Good overall evaluation Note that a blank column indicates a poor overall evaluation.

Patent applicant: Unitika Co., Ltd.

Claims (1)

[Claims] (1) After heat treatment for crimp development under a load of 1.7 x 10-' g/dF) in agricultural water for 10 minutes, the number of crimp was 15/
Potentially crimpable synthetic fiber yarn A that exhibits a crimp of 2.5ffi or more and a thermoplastic yarn that has a hot water shrinkage rate of 1096 to 2096 and that is 596 to 10% higher than that of the yarn A. A mixed fiber yarn consisting of synthetic fiber yarn B is prepared as follows (1)
A method for producing a bulky mixed fiber yarn, characterized by carrying out relaxation heat treatment under conditions that satisfy the following formula: However, or: Relaxation rate T: Heat treatment temperature f℃) 100≦T≦180 S process: Hot water shrinkage rate of yarn A (4) S process: Hot water shrinkage rate of yarn B (9)