JPS61119738A - Special false twisted processed 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] <Industrial Application Field> Although the present invention is manufactured using a single processing weight,
Filaments with significantly different crimp shapes are mixed, but there is no difference in actual filament length.

This invention relates to a false twisted yarn that is stable against external forces.

<Prior art> Conventionally, many false-twisted yarns have been manufactured that are made of filaments that exhibit a uniform crimp shape in the longitudinal direction and cross-sectional direction of the yarn. Compared to mixed processed yarns, the appearance was monotonous and lacked a sense of fullness. Various methods have been tried to solve this problem2, for example,
Publication No. 38538 proposes a method for producing a special processed yarn in which a thermoplastic synthetic fiber pre-shrink blended yarn with a defined shrinkage rate difference is subjected to relaxation heat treatment, a yarn length difference is imparted to the yarn, and then a false twisting process is applied. has been done. However, in order to make a false twisted yarn containing a mixture of filaments with different crimped shapes by utilizing the difference in shrinkage rate of the crimped blended yarn, it is necessary to use different crimped filament bundles consisting of high-shrinkage filament bundles and low-shrinkage filament bundles. Shrinkage mixed fiber yarns are subjected to relaxation heat treatment to create a yarn length difference between the two filaments I and bundles, and processed so that the yarn length difference is maintained during false twisting.

When false twisting is performed in this manner, the high shrinkage filament bundle becomes more highly crimp. In order to perform false twisting so that the difference in yarn length that occurs during the relaxation heat treatment is maintained, the high-shrinkage filament bundle, which has a relatively shorter yarn length than the low-shrinkage filament bundle, must be made larger than the low-shrinkage filament bundle. Therefore, the residual elongation of the processed yarn is high because the increase in elongation caused by the relaxation heat treatment is not eliminated by false twisting.

Not only does it have low stability against external forces, but it also has the drawback of being easily displaced by ironing in the weaving and knitting process because of the residual yarn length difference. In addition, even if the processed yarn is stretched in order to increase its stability against external forces, the crimps of the highly crimped filament bundle are stretched and become low crimped, resulting in the entire yarn having low crimps. It is not possible to give a wide crimp difference to the processed yarn just by using the crimping method.

<Problems to be Solved by the Invention> The present invention has been made in order to eliminate the drawbacks of the conventional false twisted yarn as described above, and although it is manufactured with an i- processed yarn, It is a false twisted yarn in which different filaments are mixed in a wide crimped shape, and there is no difference in yarn length between the filaments that make up the yarn, and it is stable against external forces and has a crimp mix effect. The technical problem is to ensure that the low-shrinkage filament does not exhibit a substantially crimped shape for characterization.

<Means for solving the problems> In other words, the present invention is a false twisting process obtained by processing a thermoplastic synthetic fiber differentially shrinkable mixed fiber yarn with a single false twisting weight without using a single thread form. The processed yarn is composed of a group of filaments that are substantially crimped and a group of filaments that clearly have a crimped shape.

It is characterized in that there is no substantial yarn length difference between the single filaments, and the crimped shape remains essentially unchanged under a tension of 1 g/d.

The present invention will be further explained in detail below.

First, the false twisted yarn of the present invention is a false twisted yarn obtained by processing a thermoplastic synthetic fiber differentially shrinkable mixed fiber yarn in the form of a single thread using a single false twisting weight. That is, 2. The false twisted yarn of the present invention is obtained in this manner. 1. For example, the filaments constituting the yarn have the same heat shrinkage rate, and the yarns have different heat shrinkage rates. Compared to a textured yarn obtained by false twisting each yarn using a separate weight, the heat history caused by the processing weight is the same for both high and low crimp filaments. It has the characteristic of being. Therefore, it goes without saying that differences in physical properties between high-crimp filaments and low-crimp filaments due to variations between processing weights are not a problem, and even if there is some variation within processing weights, the differences between high-crimp filaments and low-crimp filaments Differences in physical properties such as differences in dyeability and crimp form are uniform in the longitudinal direction of the yarn, resulting in a stable product of one quality.

Furthermore, the false twisted yarn of the present invention is comprised of a filament group that does not substantially exhibit a crimped shape and a filament group that clearly exhibits a crimped shape. What is meant by a filament that does not exhibit a substantially crimped shape?

The elongation rate measured according to JIS L 1090 is 5% or less.

Preferably, it refers to a filament of 1% or less, and a filament that clearly exhibits a crimped shape is defined by JISI.

1090, which has an elongation rate of 20% or more. In this way, the false twisted yarn of the present invention has a mixture of filaments with different crimped shapes, so it has a crimped mix effect, and since the low crimped filaments do not substantially have a crimped shape, it can be used as a raw material. You can add the luster and firmness that can be found in processed yarns.

Furthermore, the false twisted yarn of the present invention has no substantial yarn length difference in single filament feel, and its crimped shape remains essentially unchanged under a tension of 1 g/d. Here, "substantially no yarn length difference" means that the yarn length difference under a load of 0.1 g/d is 2.
5% or less, and the crimp shape remains substantially unchanged under a tension of 1 g/d, according to JIS L 109.
This refers to a case where the rate of change in the elongation rate after applying a tension of 1 g/d for 1 second is 10% or less with respect to the elongation rate measured according to 0. In other words, in the false twisted yarn of the present invention, there is no substantial yarn length difference between the single filaments, so when the yarn is squeezed during the weaving and knitting process, the high crimp filament and the low crimp filament are separated, and one of the filaments is loosened. In addition, the crimp shape remains unchanged even under a tension of 1 g/d, so even when exposed to excessive tension during the weaving and knitting process, the crimp shape remains unchanged. A product with excellent stability and three grades of stability can be obtained.

It is well known that fabrics obtained from 1ffi regular polyester yarns with different cross-section shrinkage can have silk-like luster and texture. If the cross section of the filament 1~ is made into a specific mushroom shape consisting of an approximately triangular umbrella part and a trunk, it will have an even more plump feel, and will have a silky luster rich in dryness and crispness.
It has a texture. That is, as shown in FIG. 3, the cross section of the single filament of the false twisted yarn of the present invention is mushroom-shaped, consisting of a substantially triangular cap and a trunk, and the trunk is connected from the tip of the substantially triangular cap to the trunk. If the relationship between the distance (H) to the end and the width (L) of the approximately triangular umbrella part is )T>L, then 1. For example, in the case of a regular triangular or star-shaped filament, the concave part of the filament The so-called filling phenomenon, in which the convex portions of other filaments enter into the filaments and the filaments come into close contact with each other, is difficult to occur, and many voids are formed between the filaments.

The feeling of fullness increases, and since H>L, the protrusion of the trunk further promotes the filling prevention effect.

In addition, by making the cross-sectional shape of the filament mushroom-shaped, each vertex and trunk of each part protrude outward on the surface of the yarn, and when you touch the fabric obtained from the false twisted yarn of the present invention, The fingertips are pleasantly stimulated by the protrusion of the single filament, and the contact area transmitted to the fingertips is reduced, so it not only feels smooth and dry to the touch, but also has a silky texture with a rich crunch. is obtained. and,
Furthermore, even though it is processed with a single processing weight, different filaments are mixed in the wide width of the crimped shape.

There is no substantial difference in filament length, and it is possible to obtain a false twisted yarn that is stable against external forces.

Next, the manufacturing principle of the false twisted yarn of the present invention will be described. 5. The false twisted yarn of the present invention contains filaments whose thermal stresses are reversed under high relaxation rate and low relaxation rate or under drawing state. For different shrinkage blend yarns.

After a relaxation heat treatment is performed in advance under a relaxation rate in which the thermal stress of the low-shrinkage filament is lower than that of the high-shrinkage filament, false twisting is performed under a relaxation rate or under a stretching state in which the thermal stress of both is reversed, and then the thermal stress is further increased. The crimp rate of the shrink filament is lower than that of the low shrink filament, and
The yarn of the present invention can be obtained by drawing it under a tension of 1 g/d or more so that it does not substantially exhibit a crimp shape.

Thus, the obtained false twisted yarn had an appearance as shown in FIG. 1, and the feeding system contained filaments whose thermal stress was reversed under high relaxation rate and low relaxation rate or under drawing state. Using a yarn, the supply system is subjected to swaging and relaxation heat treatment under a relaxation rate in which the thermal stress of the low-shrinkage filament is lower than that of the high-shrinkage filament, and then the thermal stress of both is reversed or stretched. Because the false twisting process will be performed below.

The relaxing heat treatment causes the low shrinkage filaments to become slacker and substantially longer than the high shrinkage filaments,
Low shrinkage filaments are located in the outer layer of the blended yarn. In the false-twisting process, the low-shrinkage filaments are heated and false-twisted while forming loops due to slack, but the thermal stress of the low-shrinkage filaments is higher than that of the high-shrinkage filaments under a relaxation rate or in a stretched state. Because it is false twisted at the bottom.

The low-shrinkage filament, which had low shrinkage during the relaxation heat treatment, is crimped under sufficient stress, resulting in a crimp that is more robust against stress than the high-shrinkage filament. Then, the above-mentioned false twisted processed yarn is further stretched with a drawing tension of 1 g/d or more to eliminate the crimped shape of the high shrinkage filament, which has lower crimp fastness than the low shrinkage filament. There is no substantial yarn length difference between the single filaments that make up the yarn (and the crimped shape is
Since it has been subjected to tension treatment of g/d or more, it has a characteristic that it remains substantially unchanged even after applying tension of Lg/d.

-10-= Fig. 2 is a process schematic diagram showing an example of the manufacturing process of the processed yarn of the present invention. Thermal shrinkage stress (tension measured in a fixed length heating atmosphere for each filament bundle separated into a high-shrinkage filament bundle and a low-shrinkage filament bundle), which is a synthetic fiber differentially shrinkable mixed fiber yarn.
is a differentially contractible mixed fiber yarn (Y
) passes through the feed roller (1) and then the feed roller (
1, 1 and the first delivery roller (3) are subjected to relaxation heat treatment by the first heater (2) under a high shrinkage rate, and through the first delivery roller (3), the first delivery roller (3) and the second pre-heli roller ( 6) The high shrinkage filament and the low shrinkage filament are heat-set by the second heater (4) while being strained by the false twisting spindle (5) under a relaxation rate or a stretching ratio in which the thermal stresses of the high-shrinkage filament and the low-shrinkage filament are reversed. , the high shrinkage filament is drawn between the second delivery roller (6) and the third delivery roller (7) via the second pre-heli roller (6) so that the crimp ratio of the high shrinkage filament is lower than the crimp ratio of the low shrinkage filament; The winding roller (8) passes through the third delivery roller (7).
) is rolled up into a package (9).

Thermoplastic synthetic fibers that can be used in the differentially shrinkable mixed fiber yarn of the present invention include synthetic fibers obtained from polymers such as polyester, polyamide, and polyacrylonitrile, and copolymers and blend polymers thereof, which are particularly targeted for the present invention. Silk-like luster.

Polyester fibers with excellent physical properties are preferred in order to obtain a good texture.

<Examples> Hereinafter, the false twisted yarn of the present invention will be specifically described based on Examples.

EXAMPLE Polyethylene terephthalate was spun using the same spinneret and heat treated during drawing to produce a polyester differentially shrinkable mixed fiber yarn 75d/48f (A yarn) and polyester differentially shrinkable mixed fiber yarn with mushroom-shaped cross section 75d/48f
(Yarn B) was subjected to relaxation heat treatment, false twisting treatment, and stretching treatment under the processing conditions shown in Table 1 according to the steps shown in FIG. 2 to produce two kinds of special false twisted yarns of the present invention.

In addition, the stretching ratio (1,05
) The thermal stress of the low shrinkage filament bundle measured under
/d was ``2''.

Table 1, -13- It is composed of two threads, one of which looks like a raw thread and the other one that looks like a false twisted thread, and its yarn quality characteristics. were as shown in Table 2.

Table 2 Also, even when the two types of special false twisted yarns of the present invention were squeezed while being held at a tension of 30 g, no shearing phenomenon was observed at all. Furthermore, the elongation rates after applying Ig/d tension for 1 second were 20% and 19.5%, which were substantially unchanged from before the tension was applied.

On the other hand, for comparison, 37.5 d/f of ethylene terephthalate-based copolymerized polyester multifilament yarn copolymerized with 2.5 mol% isophthalic acid and 37.5 d/f of polyester multifilament yarn made of polyethylene terephthalate were spun. Polyester differentially shrinkable blended yarn 75d/48f, which is the same brand as above and whose heat shrinkage stress is not reversed unlike the characteristics shown in Figure 4, was subjected to relaxation heat treatment and false twisting under the processing conditions shown in Table 3. Processing - Comparative textured yarns were made by subjecting them to a drawing process.

Table 3 The processed yarn for this comparison had a bulging appearance with many fine loops, but the crimped shape clearly became a thin layer, and one of the yarns was not yarn-like.
A so-called flow phenomenon occurs under a tension of
Under the tension of g/d, the crimp shape of the entire yarn almost disappeared.

<Effects of the Invention> As stated above, since the false twisted yarn of the present invention is processed using a single false twisting weight from a supply system in the form of a single yarn, it is possible to produce high crimped filaments and low crimped filaments. Differences in physical properties such as differences in dyeability and differences in crimp form with crimped filaments are uniform in the longitudinal direction of the yarn, and the two grades are stable. In addition, the false twisted yarn of the present invention is a crimped mixed yarn containing filaments that do not exhibit a substantially crimped shape, so even though it is a naturally crimped yarn, it cannot be used in products using so-called raw yarn. Adds a sense of luster and firmness to the waist. Furthermore, the false twisted yarn of the present invention has no difference in yarn length between each single filament, and the crimped shape remains unchanged even under a tension of 1 g/d, so it is stable in the weaving and knitting process. Has characteristics.

In particular, if the cross section of the filament is shaped like a mushroom consisting of a substantially triangular umbrella and trunk, the porosity between the filaments will be increased, giving the fabric a fullness and warm taste, as well as a dry and crunchy feel. A rich silk-like texture is obtained.

[Brief explanation of the drawing]

Figure 1 is a model diagram showing the appearance of the false twisted yarn of the present invention;
The figure is a process schematic diagram showing an example of the method for manufacturing the false twisted yarn of the present invention, Figure 3 is a cross-sectional view showing an example of a single filament of the differentially shrinkable mixed fiber yarn used in the present invention, and Figure 4 is a cross-sectional view showing an example of the single filament of the differentially shrinkable mixed fiber yarn used in the present invention. 2 is a graph showing the relationship between the relaxation rate and thermal stress at 200° C. of high shrinkage filaments and low shrinkage filaments of differentially shrinkable mixed fiber yarns to be subjected to. (a) - a group of filaments that do not exhibit a substantially crimped shape;
(bl - filament group clearly exhibiting a crimped shape,
(H-feed roller, +21-first heater. (3)-first delivery roller, (41-second heater. 15)-false twist spindle, +6)-second delivery roller, (71-third delivery roller, ( 8) -
Winding roller, (91-package, (Y) ---
---Different shrinkage mixed fiber yarn.

Claims (1)

[Scope of Claims] 1. A false-twisted yarn obtained by processing a thermoplastic synthetic fiber differential shrinkage blend yarn in the form of a single thread using a single false-twisting weight, the processed yarn consists of a filament group that does not substantially exhibit a crimp shape and a filament group that clearly exhibits a crimp shape, and there is no substantial yarn length difference between the single filaments, and the crimp shape is 1 g/d. A special false-twisted yarn characterized by being substantially unchanged under the tension of. 2. The differentially shrinkable mixed fiber yarn is made of polyester fibers, and the cross section of the single filament is mushroom-shaped, consisting of an approximately triangular umbrella portion and a trunk. The distance to the end (H) and the width of the approximately triangular umbrella (
Claim 1 in which L) satisfies H>L.
Special false twisted yarn as described in section.