JPH02277845A - Production of fluff-bound modacrylic spun yarn - Google Patents

Abstract

PURPOSE:To obtain the subject spun yarn having excellent weaving ability without fluff with making the best use of inherent characteristics of modacrylic spun yarn such as color-developing property, transparency and feeling by making spun yarn comprising acrylic copolymer contact with rotating heater. CONSTITUTION:Spun yarn of modacrylic fiber of copolymer composed of 30-90wt.% acrylonitrile unit and 10-70wt.%, preferably 30-55wt.% comonomer unit copolymerizable with acrylonitrile (preferably vinyl chloride-based) is brought into contact with a heater with being rotated by a false-twister, etc., to afford the aimed spun yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a fluff-free acrylic spun yarn with good weavability.

[Conventional technology]

As the demand for flame retardancy for interior bedding textile products increases,
Acrylic spun yarn is widely used as a material for interior bedding due to its color development, transparency, and good texture, and its growth is remarkable.

However, with the expansion of applications, there is an increasing demand in the weaving field for acrylic spun yarns that do not cause weaving problems and are free of fuzz.

Sizing has traditionally been the most common method for reducing fuzz in acrylic spun yarns. On the other hand, as a countermeasure in the spinning process, double yarn processing is used for relatively thick yarn counts, but for fine yarn yarns, a method has been proposed in which free short fiber ends are rolled into the system during heating during spinning (Unexamined Japanese Patent Publication No. No. 59-150121).

[Problem to be solved by the invention]

Conventional fuzz binding using glue requires a drying process, and desizing must be performed after fabrication, which is complicated, costly, and
The problem of change in texture remains.

On the other hand, the double yarn processing method inevitably results in a thicker count and is limited to products with relatively thick counts, and since the original fuzz of the spun yarn remains, it is easy for adjacent yarns to sag.
Can only be used on coarsely dense fabrics. In addition, when heating in spinning, the ends of short fibers with free fluff are rolled into the system, which increases the number of heating steps, which impairs the unique soft texture of acrylic fibers and makes the fibers hard, which can only be used for limited purposes. There is no versatility.

All of these conventional fluffing methods still have problems to be solved, such as problems with texture and the fact that they can only be used for limited purposes.

[Means to solve the problem]

The present invention comprises 30 to 90% by weight of acrylonitrile units and 70 to 90% by weight of comonomer units copolymerizable with acrylonitrile.
The method is characterized in that a spun acrylic fiber yarn made of a copolymer containing 10% by weight is brought into contact with a heating element while being rotated.

That is, the important point of the present invention is to eliminate fuzz, which is a problem in the weaving process, by bringing the acrylic fiber spun yarn containing a comonomer copolymerizable with acrylonitrile into contact with a heating element while rotating it under tension.

The acrylic fiber spun yarn used in the present invention is obtained by spinning acrylic fibers made of a copolymer composed of 30 to 90% acrylonitrile units and 70 to 10% comonomer units copolymerizable with acrylonitrile by a normal method. be. Comonomers that can be copolymerized include vinyl chloride, vinylidene chloride, vinyl bromide, vinyl acetate,
Examples include methylvinylpyridine, acrylic acid, acrylic acid ester, styrene sulfonate, and the like, and one or a mixture of two or more of them can be used, but the present invention is not limited to these. In order to maintain the general properties of acrylic fibers and exhibit excellent thermoplasticity, vinyl chloride-based comonomers are preferred. Furthermore, 30-5
A 5% by weight copolymer is more preferred.

The spun yarn made of acrylic fibers in the present invention includes not only raw silk but also general post-processed yarns such as twin yarns and dyed yarns.

In the present invention, in order to obtain a fluffed acrylic spun yarn with good weavability, it is necessary to bring the spun yarn into contact with a heating element while giving rotation to the yarn. In the present invention, a false twister, a rubbing roll in the spinning process, a jet spin, etc. can be used as a means for imparting rotation to the spun yarn, and a real twister such as a double twister can also be used.

In terms of the false twisting method, the number of false twists is preferably 5 to 20% of the actual number of twists of the raw material spun acrylic fiber yarn, less than 5% is insufficient, and 5% or more will result in fluffing as a whole, and 2
At a false twist number of 0% or more, the fuzz reduction effect is saturated. Therefore, a preferable range is 5 to 20%. In the case of a rubbing roll, it is preferable to apply rubbing at a rate of 75 to 300 times/min at a yarn speed of 15 m/min.

Furthermore, in order to evenly fluff the acrylic spun yarn, it is important to process it under tension, so no matter what rotation method you use, 5 to 20 g, preferably 1
It is desirable to apply a tension of 0 to 18 g.

The heating body of the present invention is not particularly limited as long as it has a shape such as a metal plate, tube, or drum that can make full contact with the acrylic fiber spun yarn.

The temperature of the heating element of the present invention is preferably a temperature equal to or higher than the glass transition point of the acrylic fiber, and is usually 180 to 200°C.

(Example) Next, the present invention will be specifically explained based on examples.

In the examples, the strength, elongation, hot water shrinkage rate and number of fluff are JI
Measurements were performed according to SL-1095. The fluff was evaluated using an Azuma type fluff measuring device. Weaving quality is evaluated as good if the warp threads do not get tangled, and poor if the warp yarns stop due to tangles.As for the quality of the fabric, when the fabric is exposed to steam at 100°C, it does not shrink and has a soft texture. , Those in which shrinkage occurred, the fabric form deteriorated, and the texture became hard were judged to be defective.

Example 1 Acrylonitrile 55% by weight, vinyl chloride 45% by weight
A 2 denier acrylic fiber made of a copolymer obtained by copolymerizing 2 denier fibers and a fiber length of 51 m/m was processed using an ordinary ring spinning machine to obtain a yarn of 1152 Nm.

This yarn was twisted at 560 T/m to give a final twist of 2152 Nm, and when maintained at a processing tension of 13 g using a false twister, it became 28 T/m.
After false twisting, the fabric was rolled up while being brought into contact with a drum heated to 180°C for about 4 seconds. When the physical properties and fuzz count of this processed acrylic fiber spun yarn were evaluated, results were obtained in which the fuzz was significantly reduced while the physical properties were unchanged from those of the unprocessed yarn (Comparative Example 1). Furthermore, using this thread as a warp, the warp density is 1
Weavability was evaluated using 8-ply satin weave at 35 threads/inch. The results were extremely good as shown in Table 1.

Examples 2 to 5 In Examples 2 to 4, acrylic spun yarns made of the same copolymer as in Example 1 were used, and the conditions of heating temperature, number of false twists, and processing tension were changed as shown in Table 1. Show the results.

In Example 5, heat treatment was performed at a processing tension of 10 g using a rubbing roll (number of rubbings: 300 times/min, yarn speed: 15 m/min) as another rotation method instead of the false twisting method of Examples 1 to 4. As a result of processing under these conditions, there are no long fluffs at all, and the number of fluffs from 1 m/m to 10 strands/m or less is 3 to 5.
It was shown that the number of fuzz of m/m or more was reduced to 0 fuzz/m, and the weavability was significantly improved.

Comparative Examples 1 to 4 On the other hand, Comparative Example 1 is the same acrylic spun yarn as in the example and is a yarn that is not fluffed (unprocessed yarn). Regarding the weaving properties of this yarn, the warp threads were extremely rough and there were many stoppages, making it extremely difficult to weave.

In Comparative Example 2, in which the number of false twists was 140 T/m and the processing tension was 18 g, a slight change in physical properties was observed, indicating that the effect of fluffing had reached a saturated state, and there was a limit to the effect of rotating the yarn. The result was as follows. In Comparative Example 3, heat treatment was performed without applying rotation due to false twisting, but the effect of curling was not sufficient.

Comparative Example 4 is a commercially available acrylic spun yarn (acrylonitrile 9
2% by weight or more) using the same false twisting machine as in Examples 1 to 4.
The results are shown in which false twisting was applied at 116 T/m while applying a processing tension of 0 g, and heat treatment was performed using a 200'C drum. This acrylic spun yarn containing 92% by weight or more of acrylonitrile had little fluffing effect and poor weavability.

Margin [Effects of the Invention] The spinning processing method of the present invention makes use of the inherent characteristics of acrylic spun yarn, such as color development, transparency, and texture, while achieving revolutionary fluffing and improving weavability. It is possible to supply acrylic spun yarn that can be used in various ways.

In addition, after processing, the spun yarn produced by the method of the present invention solves the problem of heat shrinkage after weaving without further heat treatment, and it is possible to obtain a fabric that does not impair its texture, and it is also possible to weave fine-count yarn, expanding its applications. It is possible to expand the number of people.

Patent applicant: Asahi Kasei Industries, Ltd.

Claims (1)

[Claims] A hair wrap characterized by rotating an acrylic fiber spun yarn made of a copolymer composed of 30 to 90% by weight of acrylonitrile units and 70 to 10% by weight of comonomer units copolymerizable with acrylonitrile and bringing it into contact with a heating body. Manufacturing method of acrylic spun yarn