JPS59179810A - Production of polyester thick-and-thin yarn - Google Patents

Abstract

PURPOSE:An undrawn polyester yarn of high orientation and lower crystallinity both of which have specific values, respectively, is heat-treated under relaxation, and drawn under specific conditions to produce the titled yarn with a large thick and thin ratio and no embrittlement caused by post processings. CONSTITUTION:A polyester undrawn yarn of 20-80X10<-3> optical birefringence (DELTAn) and less than 25% crystallinity 1 is subjected to heat treatment under relaxation without coming into contact with the heater 4, preferably at a 30- 150% relaxation rate. Then, the resultant yarn is brought into contact intermittently with the heater 8 by means of an air cylinder 11 to effect drawing under a tension lower than the yield point to produce the objective thick and thin yarn. EFFECT:The process according to the present invention can give a yarn with a desired thick and thin pattern with over 1.3 of thick and thin ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a polyester yarn having thick and thin lines in the longitudinal direction. The present invention relates to a method for manufacturing a novel yarn whose thick parts are squared by drawing the yarn at the same time.

Conventionally, large fine yarns have been manufactured using various types of polynisdel undrawn yarns as feeding systems.

For example, when using an undrawn yarn with a birefringence index (△n) of about 0.5 to 10xlO' as the supply system, it has the advantage that the diameter ratio between the thick part and the small part (thick-thin ratio) is large. ,on the other hand,
Since the degree of orientation in most of the fibers is too low, the fibers become brittle during post-processing heat treatment such as false twisting, and have drawbacks such as being susceptible to yarn breakage. For this reason, recently the birefringence (80) or 15~s
Highly oriented undrawn yarn with an ox of about 1O-3 is used.

In addition, as a specific fishing force method for producing thick and thin thread, there are 5 examples, for example, Japanese Patent Publication No. 38-2018, Publication Book 5, Special Publication No. 38-201.
Publication No. 9, Special Publication No. 39-9175, Special Publication No. 42-
A deformed roller as described in Japanese Patent No. 27563,
Many methods have been proposed, including a method in which the stretching ratio is changed mechanically by using notches 1' and a periodicity, and a method in which the stretching ratio is lower than the natural stretching ratio. However, in these conventional methods, thick and thin yarns are obtained using the mechanical fishing force method or drawing conditions while using the feeding system, so the thick portion cannot exceed the diameter of the feeding system and only yarns with a small thick-to-thin ratio are obtained. There was a drawback that there was no

The present invention was conceived as a result of intensive studies aimed at solving the drawbacks of conventional large and fine yarns using undrawn polyester yarns, as described in the following. 2, l&power ■] 2 will cause a crisis, <, shimakashi is a person with a large fat-to-thin ratio and a desired pattern S, +
The tear-making power of large fine polyester yarn with a rating of 41 ++ is 1 - 1.

J That is, 1 The present invention has a birefringence (△n) of 20 to 80
l O-3, a highly oriented, low-crystalline undrawn polyester yarn with a degree of crystallinity of 25% or less is brought into contact with a heating device, subjected to a relaxation heat treatment, and then the yarn is intermittently treated! The gist of the present invention is a method for producing large and fine polyester yarn, which is characterized in that the yarn is stretched at a tension below the yield point of the yarn while being treated.

The present invention will be explained in detail below.

In the present invention, first, the birefringence (△n) is 20 to 80.
X] O-3, undrawn highly oriented low-crystalline polyester yarn with a crystallinity of 25% or less is heat treated in a relaxed state without contacting with a coating device, and the two yarns are sufficiently shrunk and supplied. The yarn has a thicker fineness and a higher residual elongation than the other yarns. In order to make the yarn change like this, the birefringence (△n) must be 20
~80X10-3. It is necessary to use a highly oriented, low-crystalline undrawn polyester yarn with a degree of crystallinity of 25% or less as the supply system.

When using an undrawn yarn with a birefringence (△n) of 20 .

It is not preferable to add it at 7 o'clock because the entry part tends to become brittle. On the other hand, the birefringence (△n) of the supply system is 8°Xl0-”
If it exceeds this, the degree of orientation becomes close to that of a drawn yarn, and a large thick-to-thin ratio cannot be obtained, which is inappropriate.

Furthermore, if the crystallinity of the supply system exceeds 25%, the crystallinity will be 30% or more during relaxation heat treatment, and it will be difficult to form clear large details in the yarn even if the yarn is hot drawn. Become.

In the present invention, as described above, the yarn is heat-treated in a relaxed state without contacting the heating device.

Since tension is applied to the filaments, the filaments of the yarn cannot undergo sufficient contraction at free positions, which is undesirable because variations in orientation and crystallinity occur. Further, the relaxation rate during the relaxation heat treatment may be such that the difference between the stretchability at room temperature and the stretchability during the heat treatment is larger than that in the supply system, or a relaxation rate of 30 to 150% is preferable.

Note that the term "relaxation rate" as used in the present invention refers to the ratio of the difference between the supply speed and the withdrawal speed to the withdrawal speed, expressed as a percentage.

Further, the temperature during the relaxation heat treatment is preferably in the range of 130 to 170°C, although it depends on the relaxation rate and yarn speed. If the heat treatment is carried out at the above-mentioned temperature, the degree of orientation will not increase much and it can be obtained by intermittent hot stretching which will be described later.

It is possible to increase not only the thick/fine ratio of the large/fine yarn but also the dyeability.

In the present invention, the yarn heat-treated as described above is modified: 11
The yarn is stretched at a tension below the yield point of the yarn while intermittently contacting the body. Through this treatment, the yarn portion that comes into contact with the heating element is hot-stretched and drawn due to the heat-receiving effect, resulting in a finely oriented part with a high degree of orientation, while the yarn portion that does not come into contact with the heating element is not drawn because the heat-receiving effect does not reach it. Therefore, a low degree of orientation results in a large fineness portion that is larger in fineness than that of the supply system.

the result.

A large fine polyester yarn is formed which has a thick/fine ratio of 1.3 or more in the longitudinal direction and 0%, which shows uneven yarn fineness, is 5% or more.

In order to obtain a yarn with a large thick-to-thin ratio by drawing the yarn that has been subjected to the relaxation heat treatment while intermittently contacting the heating element, the tension at the time of drawing must be set to a tension below the yield point of the yarn at room temperature. It is necessary to do so. If the stretching tension exceeds the above-mentioned tension, it is not preferable because the thick-to-thin ratio becomes small and single filament breakage, thread breakage, etc. tend to occur. Further, the temperature of the heating body is preferably in the range of -30°C to +90°C, which is the glass transition point of the yarn.

Next, the stretching conditions described in Section 2 will be explained with reference to FIG.

FIG. 1 is a graph showing an example of a strong elongation curve.

In the figure, (A) is the supply system at room temperature, (A') is the heating atmosphere of the yarn, (B) is the yarn after the supply system has been subjected to relaxation heat treatment at room temperature, and (B') is the yarn of the yarn at room temperature. Each shows the behavior in a heated atmosphere. In general, thick and thin yarns are obtained by drawing at a stretching ratio corresponding to a tension below the yield point of the currently fed yarn, but as is clear from Figure 1, at a tension (strong) below the yield point at room temperature, Difference in elongation between the processed yarn (Δ′) and room temperature (A) before relaxation heat treatment (
The difference in elongation (Y'-X') between heating (B') and chamber'/m (I3) of the yarn after relaxation heat treatment is much better than Y-X).

Therefore, as in the present invention, if the yarn after the relaxed tuff treatment, which has a large elongation difference between heating and room temperature, is intermittently heat treated and then stretched with a tension below the yield point at room temperature, the ri Since the stretchability is good, it is stretched at a relatively high magnification, resulting in fine fine details.On the other hand, since the overall stretching magnification is constant, as a result, the stretching rate of the non-heat-treated area is constant, so as a result, it is not! !!The drawing ratio of the processing section is smaller, resulting in a thick section with a large fineness, and a yarn with a large thick/fine ratio can be obtained.

Furthermore, since the yarn after the loosened tassel treatment that undergoes stretching is larger than the diameter of the supply system, even if most of the yarn is stretched to some extent, it can be kept larger than the diameter of the supply system depending on the stretching conditions.

On the other hand, if a yarn with a small difference in elongation between heating and room temperature (as is in the supply system of the present invention) is drawn while being intermittently heat-treated, the difference in drawing ratio between the two heat-treated parts and the non-heat-treated part is small. Only yarns with a small thickness-to-thickness ratio can be imprinted, and the diameter of the non-heat-treated portion is also stretched to some extent, making it smaller than the diameter of the supply system, which is not preferable.

As mentioned above, in order to increase the difference in the drawing ratio between the tassel-treated area and the non-heat-treated area, it is necessary to create a heat-treated area and a non-heat-treated area at least at one location in the intercostal space where the yarn passes through the drawing zone. It is preferable to stretch the film while subjecting it to intermittent heat treatment.

Next, one embodiment of the present invention will be explained with reference to FIG.

Birefringence (△n) obtained by high-speed spinning is 20 to 80
10-3, Feed the single-oriented low-crystalline poly Nisdel undrawn yarn (1) with a crystallinity of 25% or less through the yarn feeder 1 (2). 1'
o - life (3) and pre...,su I:J f (5
) to the non-contact type heater (4)C between the fibers and the fibers and perform the treatment 15 in a relaxed state to sufficiently shrink the yarn. Subsequently, the pre-heli roller (5) and the drawing roller (between 0 and 0) (movement guide f711, which reciprocates in a direction perpendicular to the running direction of the yarn by turning on and off the air cylinder (11)) Without intermittently contacting the heating element (8), the yarn is drawn with a tension below the yield point of the yarn, and the iV-shaped thick and thin yarn is taken up with a winding roller (9) at 1'4F and pano gauge θ0). Turn it up.

As mentioned above, the present invention has a birefringence (△n) of 20 to 80.
XIO-", a highly oriented low-crystalline polyester yarn with a degree of crystallinity of 25% or less is subjected to relaxation heat treatment in a non-contact state, and after 7 days, the yarn is intermittently heat-treated to increase the yield point of the yarn. Since it is stretched with the following tension.

The human A111 ratio is greater than 1.3 and 1-, and 0% is 5%
(Me) It is possible to easily obtain a yarn having a diameter of 8111 according to the set pattern with or without treatment, and it is also possible to make the diameter of most of the yarn larger than the warp of the supply system. Woven and knitted fabrics using strips can have a spanky appearance such as large thick and thin spots and dark and light dyeing spots.In addition, the birefringence (△n) is 20 to 80XIO-3,
Since the feeding system is a highly oriented, low-crystalline polynisdel undrawn yarn with a crystallinity of 25% or less, most of the yarn obtained is highly oriented, and is difficult to obtain during post-processing such as temporary dyeing or dyeing. It has the advantage of not becoming brittle.

(9) Polyester (according to the present invention) is a general term for polyesters containing ester bonds in the molecular chain represented by polyethylene terephthalate 1-, and modified polyesters containing a third component such as isophthalic acid and 2-paraoxyethoxybenzoic acid. It also includes.

In addition, the thick/thin ratio is the ratio of the diameters of the thick part and the thin part of the thread, and after twisting the thread with LOOT/M, the thick part and the thin part are 41
This is the value obtained by measuring the + diameters at five locations, and dividing the average diameter of the major portion by the average diameter of the minor portions. 0% is a value measured under twisting and tension using a twister manufactured by Zellheger under the conditions shown below.

(2% measurement conditions 5) In the present invention, a method of intermittently heat-treating yarn is to use an air cylinder with a guide attached to its tip according to instructions from a microcomputer.

A method in which the yarn is traversed by the reciprocating motion of an air cylinder during on and off operations, or the yarn is traversed by a guide installed at an eccentric position on a rotating disk to intermittently contact the heating element. Any method may be adopted, such as the following: The present invention will be explained in detail with reference to Examples.

Example 1. Comparative Example 1 The birefringence (80) obtained by high-speed spinning was 45X10-3. 230d/48f of highly oriented, low-crystalline undrawn polyester yarn with a crystallinity of 9.3% was subjected to relaxation heat treatment using a non-contact heater, and then stretched between a pair of rollers (stretching zone length 1.2 m). By reciprocating the moving guide in the direction perpendicular to the running direction of the yarn by turning on and off the air cylinder, the yarn is traversed and intermittently brought into contact with the heating element, while the tension is below the yield point of the yarn. The tension (strength) at the yield point of the stretched yarn was 150 g.

Further, as a comparative example, a large fine yarn was obtained by performing the same treatment except that the relaxation heat treatment was not performed. The tension (strength) of the yarn at the yield point was 170 g. Processing conditions are shown in Table 1.

Table 1: All of the obtained yarns had a general pattern in the longitudinal direction as specified, and had the values shown in Table 2. The yarn of Example 1 was better than Comparative Example 1 both in terms of thick-to-thin ratio and C%.

Moreover, the diameter of the thick part was larger than the diameter of the supply system, and it was full of large fine spots.

A plain weave was woven using the yarn obtained in Example 1.

After dyeing and finishing, the majority of the material does not become brittle and has 27 times the strength required for practical use.Moreover, the unevenness of the thick details and the good contrast of light and shade combine to create a spun-like appearance. It had an appearance.

[Brief explanation of drawings]

Figure 1 shows the supply system at room temperature (A), the yarn in the heated atmosphere (A'), and the yarn after the supply system was subjected to relaxation heat treatment at room temperature (A').
B) is a graph showing an example of the strength and elongation curve of the yarn in a heating atmosphere (B'). FIG. 2 is a schematic diagram showing an embodiment of the present invention, in which (1) is an undrawn polyester yarn, (3) is a foot roller, (4) is a non-contact type heater, (5) is a pre-heli roller, (6) is a stretching roller, and (7) is a moving guy]. (8) is a heating element, and (9) is a winding roller. Patent Applicant: Unitika Co., Ltd. Hand Iv I5net tlf-7Ti Written (spontaneous) August 1981 131E1 1. Indication of the case Patent Application No. 1987-56680 2. Name of the invention Method for manufacturing polyester thick 1111 yarn 3. Amendment Relationship with Ministry Cases Addressing Patent Applicant: 1-50 Higashihonmachi, Amagasaki City, Hyogo Prefecture Contact:
destination
Z〒5 Old address 4-68 Kitakyutabe-cho, Higashi-ku, Osaka Name
Patent Department 4 of Uni Mi Chiriki Co., Ltd., Column 5 of 1-Detailed Description of the Invention of the specification to be amended, Contents of the amendment (1) 1 Dyeability - 1 on page 5, line 15 of the specification Difference in dyeing
I am corrected. (2) Delete [-Extended 1] on page 6, line 1. (3) Since it is constant at 1 in lines 717 to 18 of the same page, as a result, the stretching ratio of the non-heat-treated area is deleted.

Claims (1)

[Claims] (11 birefringence) J1 rate (△n) or 20~80xlO-3.
The highly oriented, low-crystalline undrawn polyester yarn with a crystallinity of 25% or less is subjected to relaxation treatment without contacting the heating device, and then the yarn is subjected to intermittent heat treatment while yielding the yarn. A method for producing thick polyester silk thread, which is characterized by stretching each time with a tension of less than a point.