JPH0874150A - Production of knitted fabric - Google Patents

Abstract

PURPOSE: To obtain a knitted fabric, prevented from deformation of loops and good in dimensional stability to an external force by mix knitting a conjugated fiber yarn comprising a high-melting component and a low-melting component and heat-treating the resultant union knitted fabric at a temperature for melting only the low-melting component. CONSTITUTION: This method for producing a knitted fabric is to feed polyethylene terephthalate as a high-melting component and a copolyester of terephthalic acid/isophthalic acid having a lower melting point than that of the polyethylene terephthalate by >=10 deg.C as a low-melting component to an apparatus for conjugated spinning, extrude both through a side-by-side type nozzle so that the low-melting component may account for at least >=1/5 of the fiber surface and at least >=1/10 fiber weight, then draw the resultant filaments, form a heat fusible conjugated fiber filament yarn, subsequently arrange the prepared conjugated fiber yarn in the rear reed of a tricot machine and polyethylene terephthalate filament yarn in a front reed, knit a tricot knitted fabric and then scour, relax and dye the resultant fabric, further heat-treat the dyed fabric at a temperature between melting points of both the components and mutually fuse the filaments with the low-melting component.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a knitted fabric having a low elongation and a high strength, which is used for clothes and industrial materials.

[0002]

2. Description of the Related Art A knitted fabric has stretchability because the yarns used are looped together to form a fabric, and it is widely used for clothing and industrial materials by utilizing its "stretch" and "shrinkage". Has been done. However, its stretchability is a drawback in terms of dimensional stability, and its use range may be narrowed. Various knitted fabrics with low stretchability have been devised.

One example is due to the knitted fabric structure,
It is well known that the warp knitted fabric can be reduced in elongation by combining chain structures. Another method is a method using a finishing resin, in which a hardening resin is applied in the finishing step to reduce the elongation.

However, the method based on the structure is limited in use, and the method based on the resin has insufficient durability, and a method satisfying practical use has not been proposed.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to obtain a method for producing a knitted fabric having low elongation and excellent dimensional stability. is there.

[0006]

SUMMARY OF THE INVENTION The present invention achieves the above object and has the following configuration. That is, the present invention relates to a polyester component A and a polyester component B having a melting point lower than that of the polyester component A by 10 ° C. or more.
After knitting using a composite fiber yarn in which at least 1/5 or more of the fiber surface and at least 1/10 or more of the fiber weight are knitted, heat treatment is performed at a temperature between the melting point of the polyester component A and the melting point of the polyester component B. The gist is a method for manufacturing a knitted fabric.

The present invention will be described in detail below. The polyester component A of the composite fiber yarn used in the present invention is 90
Mol% or more is an ethylene terephthalate unit (a structural unit composed of ethylene glycol and terephthalic acid), and its melting point is 240 to 255 ° C.

This polyester component A has a melting point of 10 ° C.
Polyester terephthalate, isophthalic acid, diethylene glycol,
A copolymer obtained by copolymerizing a third component such as 1,4-butanediol or 1,6-hexanediol so as to have a low melting point, polyethylene terephthalate itself or polyethylene obtained by copolymerizing the third component with the polyethylene terephthalate itself. Can be given.

Polyester component A and polyester component B
If the difference in melting point is less than 10 ° C, it becomes difficult to melt only the polyester component B in the heat treatment step after knitting and adhere to the unmelted polyester component A. A melting point difference is required.

As described above, the method of constructing the composite fibers of the polyester components A and B having different melting points of 10 ° C. or more has the object of the present invention, as shown in FIGS. 1 and 2, whether it is a side-by-side type or a sea-island type. It is possible to achieve, but the polyester component B is at least 1/5 on the surface
As described above, it is necessary that 1/3 or more is arranged to form the bonding points, and the polyester component B is at least 1/10 of the fiber weight, preferably 1/4.
The above arrangement is also necessary for bonding. If the weight ratio of the polyester component B is too high, the polyester component A will be low, and the knitted fabric after fusion will be weak. Therefore, the ratio of the polyester component B is preferably 1/2 or less.

Next, the method of using the composite fiber yarn may be used alone or as a plied yarn or entangled mixed yarn with other fibers. In the knitting process, the composite fiber yarn or plied yarn or Even if only knitted yarn is knitted,
It may be knitted with other fibers.

Whether the knitting machine to be used is a warp knitting machine or a weft knitting machine, the structure may be selected according to the purpose of use of the knitted fabric. The knitting structure is not limited, and a knitting machine may be selected according to the purpose of use of the knitted fabric. The use ratio (interlaced knitting ratio) of the composite fiber yarn can be selected according to the purpose, but it is generally preferably 1/10 or more.

After knitting, heat treatment is performed at a temperature between the melting point of the polyester component A and the melting point of the polyester component B. This heat treatment step can be performed by a normal heat setter (tenter or the like), but in order to enhance the adhesive effect, a method of passing the heat rollers while applying pressure is also effective. In either method, it is necessary to select a temperature at which only the polyester component B having a low melting point is melted, and in order to control it, a melting point difference with the high melting point polyester component A is required to be 10 ° C. or more. The low stretch knitted fabric of the present invention can be obtained by utilizing the temperature difference.

A method in which a fiber having a low melting point polyester component B alone is interwoven with other fibers has the same result as that of the present invention. However, in warp knitting, a reed for a component B single fiber is required. In addition, in circular knitting, a large number of yarn feeders are required, and in addition, polyester component B
The method of the present invention is practical and effective because of the uniformity of mixing of the above. The present invention has the above configuration.

[0015]

[Operation] The knitted fabric is a fabric in which the yarns used are arranged in a loop, and when an external force is applied, the loop shape is deformed and the yarns “stretch” accordingly, and the knitted fabrics move in the direction of the external force. Supports external force by stretching. When the external force is removed, the loop shape and the "elongation" of the yarn used return to the state before the external force was applied, and the dimensions of the knitted fabric also return to the previous values. This phenomenon is the stretchability of the knitted fabric. Therefore, in order to maintain dimensional stability against external force (prevent stretchability), it is necessary to prevent the deformation of the loop shape.

In the present invention, the basic structure of the knitted fabric is knitted with the high melting point polyester component A, and while the polyester component A intersects, the overlapping fibers as shown in FIG. 3 are joined with the polyester component B. As a result, it is possible to prevent free deformation of the loop shape of the polyester component A and reduce the dimensional stability (stretchability) of the knitted fabric against external force.

As described above, when the knitted fabric knitted using the fibers composed of the high melting point component and the low melting point component is heat-treated to melt only the low melting point component, the structure formed by the high melting point component Since the knitted fabric can be joined, the stretchability of the knitted fabric can be prevented.

[0018]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples. The performance evaluation of the polyester component and the performance of the knitted fabric in the Examples were carried out by the following methods. (1) Melting point of polyester component The melting point was measured visually under a microscope. (2) Elongation of knitted fabric A 5 cm wide sample is stretched in accordance with JIS L-1018 constant velocity stretching method and the elongation (%) at 0.5 kg load, 1.5 kg load and 3.0 kg load is measured. It was measured.

Example 1 Polyethylene terephthalate (melting point 255 ° C.) was used as the high melting point polyester component A, and the low melting point polyester component B was used.
As a co-polyester having a terephthalic acid / isophthalic acid molar ratio of 6/4 (melting point: 160 ° C.) was supplied to a composite spinning device, and the composite weight ratio was 1: 1 at 290 ° C. from a side-by-side type nozzle as shown in FIG. After spinning and hot drawing, 10
A composite fiber yarn of 0 denier 24 filaments was obtained.

The above-mentioned composite fiber yarn is arranged in the rear reed of a tricot knitted fabric (Karlmeier Co., Ltd., 28G, 180 working width), and 100 denier 72 filaments of polyester fiber made of polyethylene terephthalate is arranged in the front reed.
Loop structure (front reed 1-0 / 2-3, back reed 1-2 / 1-
0) was knitted at a threading width of 160 in at 50 C / in to obtain a raw machine.

Next, after scouring this relaxed machine with a relaxer and relaxing, dyeing it with a disperse dye at 130 ° C. using a jet dyeing machine, and further finishing amount 61 in width × 45 C /
A knitted fabric according to the present invention was obtained by performing setting at 180 ° C. for 30 seconds with an in target.

Comparative Example 1 The procedure of Comparative Example 1 was repeated except that the composite fiber yarn used in Example 1 was replaced by a polyester filament 100 denier 24 filament yarn made of polyethylene terephthalate in the rear reed. I got a knitted fabric.

Table 1 shows the measurement results of the elongation of the knitted fabrics of Example 1 and Comparative Example 1 thus obtained.

[0024]

[Table 1]

As is clear from Table 1, the knitted fabric of Example 1 according to the present invention was a knitted fabric having low elongation in both the warp direction and the weft direction. On the other hand, the knitted fabric of Comparative Example 1 shows the elongation of a normal knitted fabric.

After the fabric of the example was washed 10 times, the elongation was measured in the same manner, but the same value as the initial value was obtained.

[0027]

INDUSTRIAL APPLICABILITY According to the present invention, loop deformation is prevented by heat-treating a composite yarn having a high melting point component and a low melting point component at a temperature at which only the low melting point component is melted to bond fibers of the high melting point component, It is possible to obtain a knitted fabric that is difficult to stretch against external force.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a composite fiber that can be used in the present invention.

FIG. 2 is a cross-sectional view of a composite fiber that can be used in the present invention.

FIG. 3 is a diagram showing a joined state of the knitted fabric according to the present invention.

[Explanation of symbols]

 1 High melting point component 2 Low melting point component 3 Junction point

Claims (1)

[Claims] 1. A polyester component A and a polyester component B having a melting point lower than that of the polyester component A by 10 ° C. or more.
After knitting using a composite fiber yarn in which at least 1/5 or more of the fiber surface and at least 1/10 or more of the fiber weight are knitted, heat treatment is performed at a temperature between the melting point of the polyester component A and the melting point of the polyester component B. A method for producing a knitted fabric, comprising: