JPH062969B2 - High shrinkage stress composite yarn - Google Patents

Description

The present invention relates to a high shrinkage stress composite yarn suitable for spun yarn density.

Currently, many high-density fabrics are manufactured using filament yarn. It is considered that this is because the heat shrinkage stress is relatively high and the density of the fabric is high. However, since the heat shrinkage stress is still insufficient, the densification is not sufficient, and due to the characteristics of the filament material, the obtained high density woven fabric is poor in hygroscopicity and does not have a good texture, It had a slimy feel. Therefore, attempts have been made to make a high-density fold using spun yarn. However, this attempt was to woven as high a density as possible in the weaving stage into a high density woven fabric. Therefore,
This attempt is disadvantageous in terms of cost due to low productivity due to high density. In particular, when a fine count spun yarn having a good texture is used, the yarn breakage increases and the productivity tends to be remarkably low. On the other hand, in terms of quality, the high-density woven fabric using spun yarn was unworthy of the name. Therefore, it has been attempted to manufacture a woven fabric by using spun yarn having a high shrinkage ratio and perform shrinkage treatment to increase the density. However, simply increasing the shrinkage ratio of the spun yarn does not increase the heat shrinkage stress, and therefore the densification cannot be achieved because the binding force of the tissue prevents the shrinkage of the woven fabric during the width-drawing or shrinking treatment. Further, various composite yarns prepared by mixing multifilaments in a dispersed state with staple fiber groups have been proposed (JP-A-49-3).
6944, JP-A-55-128031, JP-B-47-2
779), the woven fabric using this composite yarn was not a satisfactory high-density woven fabric because the filament yarn had a low heat shrinkage stress.

The present invention, unlike filament yarns or spun yarns used in such conventional high-density fabrics, provides a highly shrinkable stress-composite composite yarn that is spun yarn-like and is suitable for substantially high-density fabrics. It is intended to be provided.

The present invention has the following configuration in order to achieve such an object. That is, the present invention relates to a composite yarn in which multifilaments are mixed with a staple fiber group in a dispersed state and twisted, and the heat shrinkage stress of the composite yarn at a temperature under dry heat of 130 ° C to 200 ° C. 0.2 g / denier or more, the filament taken out from the composite yarn is 130 ° C.
It is a high shrinkage stress composite system characterized by showing a heat shrinkage stress of 0.5 g / denier or more at a temperature under dry heat of up to 200 ° C. and being contained in the composite yarn in an amount of 20% by weight or more. The present invention will be described in detail below.

In the present invention, first, the multifilament must be mixed and twisted with the staple fiber group in a dispersed state. The reason why the multifilament is mixed with the staple fiber group in a dispersed state is that the heat shrinkage stress of the filament affects the entire composite yarn equally. The heat shrinkage stress of the filaments constituting the multifilament is particularly important in the present invention, and the filament taken out from the composite yarn is 130 ° C to 200 ° C, preferably 150 ° C to 1 ° C.
The heat shrinkage stress at a temperature under dry heat of 60 ° C., more preferably 140 ° C. to 150 ° C., should be 0.5 g / denier or more. This is because the composite yarn is densified without reducing the heat shrinkage stress of the composite yarn. The term “heat shrinkage stress” as used herein is defined as follows, but the sample to be measured is a filament taken out from the composite yarn before shrinkage treatment.

The term "heat shrinkage stress" as used in the present invention means that when a fiber is gripped at a constant length under a tension of 0.05 g / denier and heated and heated,
The fiber tries to heat-shrink, but since both ends are fixed, the actual shrinkage does not occur, and instead, the internal stress that causes the fiber to shrink is generated. This stress is called heat shrinkage stress. The heat shrinkage stress is measured by using a commercially available non-adhesive metal resistance wire strain meter, which is amplified and recorded as a change in stress with time by an interlocked automatic XY recorder. The sample is a loop with a fixed length, one end is hooked directly to the strain gauge and the other end is also hooked, and the sample-hook length is adjusted and fixed so that the initial tension is 0.05 g / denier at 20 ° C. When applying tension, be careful so that there is no tarmi.)
The sample fixed in this way was placed in a cylindrical quartz glass tube with an inner diameter of φ8 mm and a nichrome wire was wound on the outside of the heater. Place the sample in the heater so that the sample is positioned, and directly connect the heater and the detection end, which is placed 3 mm away from the sample, to the temperature controller that has an integral circuit with a program, and raise the temperature by 20 ° C / min. The heater is heated to continuously heat the atmosphere until it is melted and measured, and the value obtained by dividing the shrinkage force due to heat shrinkage by the denier of the fiber is defined as the heat shrinkage stress.

The content of the filament in the composite yarn according to the present invention is 20% by weight or more, preferably 30% by weight.
That is all. If it is less than 20% by weight, the heat shrinkage stress of the composite yarn decreases, and the dimensional stability of the fabric and the strength of the fabric also decrease. On the other hand, when the content exceeds 60% by weight, when the composite yarn is used to form a high density fabric, the high density fabric is unlikely to have a spun yarn tone. The filaments in the composite yarn of the present invention are preferably synthetic fibers, examples of which include polyester fibers and nylon fibers. The staple fibers constituting the staple fiber group may be synthetic fibers, artificial fibers, natural fibers or mixed spun fibers thereof, but should be selected in accordance with the desired spun yarn feel.

Next, the twist coefficient (inch type) of the number of twists applied to the composite yarn of the present invention is preferably 2.5 or more and 5.0 or less, more preferably 3.0 or more and 4.5 or less. When it is less than 2.5, the entanglement of the staple fiber and the filament is poor, and the anti-ironing property is lowered, which is preferable. If it exceeds 5.0, the texture of the composite yarn becomes too hard, which is not preferable.

In addition, the composite yarn has a temperature of 130 ° C to 200 ° C, preferably 150 ° C to 160 ° C, more preferably 140 ° C to 15 ° C.
The heat shrinkage stress at a temperature of 0 ° C. under dry heat is preferably 0.2 g / denier or more. This is to overcome the constraint force of the tissue of the contraction processing portion and contract it to increase the density. The definition of the heat shrinkage stress here is also as described above.

Now, an example of the method for producing the composite yarn of the present invention will be described. First, the oriented and crystallized yarn is stretched at a high ratio near the crystallization temperature to produce a multifilament having a high heat shrinkage stress. Next, while separating and opening the multifilament by an electric opening method, an air injection method, a tension / relaxation method, etc., a ribbon-like staple fiber group obtained by drafting a roving composed of staple fibers, a so-called fleece and a predetermined weight. % And stack with a predetermined twisting coefficient.
The twist coefficient is It is calculated from the formula. Where T is the number of twists (t / in),
K is a twist coefficient (inch system), and Ne is an English cotton count.

Example: Specific year 1.0, polyethylene terephthalate 310 ° C
Φ0.3 mm orifice holes are spun from 16 unique nozzles at a discharge rate of 1.5 g / min per hole, and the take-up speed is 40
The undrawn yarn was wound at 00 m / min. Then, using a multifilament obtained by stretching at a drawing speed of 100 m / min under the temperature condition of 85 ° C. for one section and 110 ° C. for the second step and a cotton fiber having an average fiber length of 30 mm, the composite yarn of the present invention and the composite yarn are used. Produced a densified woven fabric. For comparison, the intrinsic viscosity
Unstretched yarn of 0.63 polyethylene terephthalate wound at 285 ℃ at a take-up speed of 1300 m / min.
A composite yarn (comparative example 1) using a filament and a cotton fiber having an average fiber length of 30 mm obtained under the same conditions as in Example except that the filament was drawn under the temperature condition of 5 ° C. and 115 ° C. in the second step, and a fabric using the same. 60/1 made of cotton fibers with an average fiber length of 30 mm
A woven fabric was also produced by using the cotton yarn of Comparative Example 2 (Comparative Example 2). The results are shown in Tables 1-2. Conventional composite yarns [Examples of JP-A-49-36944 (Prior art example 1), Examples of JP-A-55-128031 (Prior art example 2), JP-B-4)
7-2779 Example (Conventional Example 3)] was used to manufacture the same woven fabric as in the example, and the characteristics thereof are also shown in the table for reference.

The heat shrinkage stress (g / denier) in the examples was measured by the Toyo Baldwin TI-
550-360 type, Toyo Baldwin Co., Ltd. as a pre-intensifier, PRE-AMPLIFIER SS-PR type, Yokogawa Denki Kogyo Co., Ltd. as an automatic XY recorder, TYPEPRO-11A type, and vacuum controller as a temperature controller. It was measured using AGNE HPC-1500 and AGNE SCR-BOX manufactured by the same company. The toughness was measured using Tensilon manufactured by Toyo Baldwin. As is clear from the results in the table, the high-density fabrics using the composite yarn of the present invention are Comparative Examples 1 and 2.
Even if the density is the same before treatment,
It was found that after shrinking treatment with boiling water at 0 ° C. for 30 minutes, the density became considerably high. In addition, it has a very splendid quality of spun yarn. In order to make the density of Comparative Example 2 the same as that of the Example, the weft 106 before the treatment.
It is considered necessary to have a weaving density of book / in and diameter thread 288 / in, and this point also shows that the present invention has high productivity. The sample of Comparative Example 1 had a higher density than that of Comparative Example 2, but was not as high as that of the present invention. In each of Conventional Examples 1, 2, and 3, the first-stage stretching is adopted instead of the second-stage stretching ratio being made higher than the first-stage stretching ratio as in the present invention. Was very low, and the fabric was not very dense.

As described above, when the composite yarn of the present invention is made into a high-density woven fabric, it is possible to achieve a higher density than that using a spun yarn of 100% staple fiber, and also has the characteristics of a spun yarn tone and more strength. The effect is that a strong woven fabric can be obtained, and a woven fabric of substantially high density can be obtained without the slimy feel of the filament yarn. Further, it is possible to woven at a density lower than that of spun yarn, to increase the density in the post-treatment stage, and to achieve the effect of cost reduction.

 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-49-36944 (JP, A) JP-A-55-128031 (JP, A) JP-A-57-128227 (JP, A) JP-B 47- 2779 (JP, B1)

Claims (1)

[Claims] 1. A composite yarn in which multifilament is mixed with a staple fiber group in a dispersed state and twisted, and the heat shrinkage stress of the composite yarn at a temperature of 130 ° C. to 200 ° C. under dry heat is 0.2. g / denier or more, the filament taken out from the composite yarn exhibits a heat shrinkage stress of 0.5 g / denier or more at a temperature of 130 ° C. to 200 ° C. under dry heat, and the composite yarn contains 20% by weight or more. A high shrinkage stress composite yarn characterized in that