JPH0733608B2 - Special false twisted yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> Although the present invention is manufactured by a single machined weight,
The present invention relates to a false twisted yarn in which filaments having significantly different crimp shapes are mixed, the filament length is not substantially different, and the filament is stable against external force.

<Prior art> Conventionally, many false twisted textured yarns made of filaments having a crimped shape that is uniform in the longitudinal direction and the cross-sectional direction of the yarn are manufactured, but these processed yarns have different crimped filaments. Compared to the mixed yarn, the appearance was more monotonous and the swelling feeling was lacking. Various methods have been tried to solve such problems, for example, Japanese Patent Publication No. 58-3.
Japanese Patent No. 8538 proposes a method for producing a specially processed yarn, in which a thermoplastic synthetic fiber heterogeneous mixed yarn having a specified shrinkage difference is subjected to relaxation heat treatment to give a yarn length difference to a yarn, and then false twisting. Has been done. However, in order to make a false-twisted yarn in which different crimped filaments are mixed with different crimp-shaped filaments by utilizing the difference in shrinkage ratio, a high shrinkage filament bundle and a low shrinkage filament bundle are used. The different shrinkage mixed yarn is subjected to relaxation heat treatment to cause a yarn length difference between both filament bundles, and is processed so that the yarn length difference is maintained during false twisting. Then, the high shrinkage filament bundle has a higher crimp. Then, in order to carry out false twisting so as to maintain the yarn length difference generated during the relaxation heat treatment, the high shrinkage filament bundle, which has a relatively shorter yarn length than the low shrinkage filament bundle, is larger than the low shrinkage filament bundle. It is necessary to carry out false twisting without stretching, and therefore, in this false twisted yarn, the increase in elongation due to relaxation heat treatment is not eliminated by false twisting, so the residual elongation of the textured yarn is high and the stability against external force is high. Not only is it low, but the difference in yarn length is left, so that it has the drawback that it tends to shift due to ironing in the weaving and knitting process. In addition, even if the textured yarn is stretched in order to enhance the stability of the textured yarn against external force,
The crimp of the highly crimped filament bundle is stretched to a low crimp, and the entire yarn only has a low crimp, and a wide crimp difference cannot be given to the processed yarn.

<Problems to be Solved by the Invention> The present invention has been made in order to eliminate the drawbacks of the conventional false twisted textured yarns as described above. A false twisted yarn in which different filaments are mixed in a wide crimp shape, and there is no difference in yarn length between the filaments forming the yarn, which is stable against external force and has a crimp mix effect. For the purpose of characterizing, it is a technical subject to prevent the low shrinkage filament from exhibiting a substantially crimped shape.

<Means for Solving Problems> That is, the present invention has a filament form in which filaments in which thermal stress is reversed under a high relaxation rate and a low relaxation rate or a stretched state are mixed. The thermoplastic synthetic fiber different shrinkage mixed yarn is heat-treated at a relaxation rate where the thermal stress of the low shrinkage filament is lower than that of the high shrinkage filament by using a single processing weight, and then the thermal stresses of both are reversed. A false-twisted yarn obtained by false-twisting under a low relaxation rate or in a stretched state, and then drawn, wherein the twisted yarn has a low crimping filament group that does not substantially exhibit a crimped shape. It consists of a group of highly crimped filaments that clearly present a crimped shape, there is no substantial yarn length difference between single filaments, and the crimped shape is substantially unchanged under a tension of 1 g / d. It is characterized by being.

Hereinafter, the present invention will be described in more detail.

First, the false twisted textured yarn of the present invention has a single yarn form, and is composed of a thermoplastic synthetic fiber mixed with filaments in which thermal stress is reversed under a high relaxation rate and a low relaxation rate or a stretched state. The shrinkage mixed fiber is heat-treated with a single processing weight under the high relaxation rate where the thermal stress of the low shrinkage filament is lower than that of the high shrinkage filament, and then under the low relaxation rate where the thermal stresses of both are reversed. Alternatively, it is a false twisted yarn obtained by false twisting in a stretched state and then stretching. That is, since the false twisted textured yarn of the present invention is obtained in this manner, for example, a plurality of filaments having the same thermal shrinkage between filaments constituting the yarn and different thermal shrinkage between yarns are used. Compared with the one obtained by compounding the processed yarns obtained by false twisting the yarns with separate weights, the heat history due to the processed weights is the same for both the high crimp filaments and the low crimp filaments. It has the feature of being. Therefore, the difference in the physical properties between the high-crimped filaments and the low-crimped filaments due to the variation between the processing weights does not matter, and even if there is some variation in the processing weights, the difference between the high-crimped filaments and the low-crimped filaments is small. The difference in physical properties such as the difference in dyeability and the difference in crimp form is uniform in the longitudinal direction of the yarn, and the quality is stable.

Further, the false twisted yarn of the present invention comprises a low crimp filament group that does not substantially exhibit a crimped shape and a high crimp filament group that clearly exhibits a crimped shape. Here, a low crimping filament having substantially no crimped shape means a filament having an elongation rate of 5% or less, preferably 1% or less, measured according to JIS L 1090, and having a crimped shape. JIS L 1090 is a crimped filament with a clear appearance.
A filament having an elongation of 20% or more measured according to the above. As described above, since the false twisted yarn of the present invention has filaments having different crimp shapes mixed together, it has a crimp mixing effect and the low crimped filaments do not substantially have a crimped shape. You can add the luster and firmness that you can see in processed yarn.

Further, the false twisted textured yarn of the present invention has no substantial difference in yarn length in filament feeling, and the crimped shape is substantially unchanged under tension of 1 g / d. Here, the fact that there is substantially no difference in yarn length means that the difference in yarn length under a load of 0.1 g / d is 2.5% or less, and that the crimp shape is substantially unchanged under tension of 1 g / d. 1 for elongation measured according to JIS L 1090
The rate of change in elongation rate after applying g / d tension for 1 second is 10%
It refers to the following cases. That is, in the false twisted textured yarn of the present invention, since there is no substantial difference in yarn length between the single filaments, the high crimped filaments and the low crimped filaments are separated by being squeezed in the fiber-making knitting step, and one of them is It can prevent loosening and nep-like defects, and the crimp shape is 1g.
Since it does not change even under the tension of / d, even if it is exposed to excessive tension in the fiber-making and knitting process, it is possible to obtain a product with excellent morphological stability and stable quality.

It is well known that a fabric obtained from a polyester irregularly shaped cross-section heterogeneous shrinkage mixed yarn can have silk-like luster and texture, but in the false twisted yarn of the present invention, the single filament If the cross section is a specific mushroom shape consisting of a substantially triangular umbrella and trunk, it will have a more swelling feeling, and will have a silky luster and texture that is rich in dryness and crispness. That is, as shown in FIG. 3, the cross-section of the single-filament filament of the false twisted textured yarn of the present invention has a mushroom shape composed of a substantially triangular umbrella portion and a trunk portion, and the tip of the substantially triangular umbrella portion extends from the trunk portion to the trunk portion. If the relationship between the distance (H) to the end and the width (L) of the substantially triangular umbrella portion is H> L, for example, in the case of a filament having a normal triangular cross section or a star cross section, The so-called filling phenomenon in which the protrusions of other filaments enter and the filaments adhere to each other is less likely to occur, and many voids are formed between the filaments.
The bulge is increased, and since H> L, the protrusion of the trunk further enhances the filling prevention effect. Moreover, by making the cross-sectional shape of the filament into a mushroom shape, each apex of each portion and the trunk portion project outward on the surface of the yarn, and when the fabric obtained from the false twisted textured yarn of the present invention is touched, Since the fingertips are comfortably stimulated by the protrusions of the single-filament filaments and the contact area transmitted to the fingertips is reduced, the feel is silky and silky to the touch, as well as having a silky dry feel. Is obtained. And, even though it is processed with a single processing weight, different filaments coexist in the crimped shape, and there is no difference in the actual filament length, and the false twisting process is stable against external force. It can be a thread.

Next, the production and the principle of the false twisted textured yarn of the present invention will be described. The false twisted textured yarn of the present invention contains filaments in which thermal stress is reversed under a high relaxation rate and a low relaxation rate or in a stretched state. The different shrinkage mixed yarn is subjected to relaxation heat treatment at a relaxation rate in which the thermal stress of the low shrinkage filament is lower than the thermal stress of the high shrinkage filament, and then the thermal stress of both is reversed under the low relaxation rate or in the stretched state. Performs false twisting and further stretches under a tension of 1 g / d or more so that the crimp rate of the high-shrink filament becomes lower than that of the low-shrink filament and the crimp shape is not substantially exhibited. As a result, the yarn of the present invention is obtained.

Thus, the obtained false twisted yarn has the appearance as shown in Fig. 1, and the filaments in which the thermal stress under the high relaxation rate and the low relaxation rate or the drawn state are reversed are mixed as the supply yarn. And the yarn is subjected to a relaxation heat treatment in advance at a relaxation rate in which the thermal stress of the low-shrinkage filament is lower than the thermal stress of the high-shrinkage filament, and then the thermal stress of both is reversed or stretched at a low relaxation rate. Since the false twisting process is performed under the condition, the low shrinkage filament is loosened and becomes substantially longer than the high shrinkage filament by the relaxation heat treatment, and the low shrinkage filament is located in the outer layer of the mixed fiber.
In the false twisting process, the low shrinkage filament is twisted and false twisted while forming a loop due to slack, but the thermal stress of the low shrinkage filament is higher than the thermal stress of the high shrinkage filament. Since false twisting is performed in the stretched state, crimping is given to the low-shrinking filament that had low shrinkage during relaxation heat treatment under sufficient stress, and crimp that is more robust to stress than the high-shrinking filament. It Further, the false twisted yarn is further drawn at a drawing tension of 1 g / d or more to eliminate the crimped shape of the high shrinkage filament having a lower crimp fastness than the low shrinkage filament. There is no substantial difference in the yarn length between the individual filaments that make up the yarn, and the crimped shape has already been subjected to a tensioning treatment of 1 g / d or more, so even after applying a tension of 1 g / d It has a feature that is invariant to.

FIG. 2 is a process schematic diagram showing an example of the manufacturing process of the false twisted textured yarn of the present invention, which is a thermoplastic synthetic fiber different shrinkage mixed fiber wound into a single package to form one yarn. The yarn has a high heat-shrinkage stress (tension measured in a constant-length heating atmosphere for each filament bundle by separating it into a high-shrinkage filament bundle and a low-shrinkage filament bundle), and a high relaxation factor as shown in FIG. The differently contracted mixed yarn (Y) in which the stress thereof is reversed between the low rolling rate and the low relaxation rate or the drawn state passes through the feed roller (1), and then the feed roller (1) and the first delivery roller (3). Between the first delivery roller (3) and the second delivery roller (6) via the first delivery roller (3) after being subjected to relaxation heat treatment under a high shrinkage rate. Shrink filament and While being twisted by the false twisting spindle (5) under a low relaxation rate or a draw ratio at which the thermal stress reverses, it is heat set by the second heater (4), passes through the second delivery roller (6), and then passes through the second delivery roller (6). ) And the third delivery roller (7) are stretched so that the crimping rate of the high shrinking filament is lower than that of the low shrinking filament, and the winding roller (8) passes through the third delivering roller (7). Is wound up on the package (9).

The thermoplastic synthetic fiber that can be used for the different shrinkage mixed yarn of the present invention is a synthetic fiber obtained from polymers such as polyester, polyamide, polyacrylonitrile and the like, and copolymers and blend polymers thereof. Polyester fiber having excellent physical properties is preferred for obtaining silky luster and texture.

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

Example Polyethylene terephthalate was spun using the same spinneret, and heat treatment during drawing showed thermal stress characteristics as shown in Fig. 4, and the polyester cross-shallow mixed filament yarn 75d / 48f (A Yarn) and polyester different shrinkage mixed yarn 75d / 48f (B yarn) with mushroom-shaped cross section
According to the process shown in the drawing, relaxation heat treatment → false twisting process → drawing process was performed under the processing conditions shown in Table 1 to produce two types of special false twisted yarns of the present invention.

The thermal stress of the low-shrinkage filament bundle measured under the draw ratio (1.05) during the false twisting after the relaxation heat treatment was larger than that of the high-shrinkage filament bundle, and the drawing tension was 1 g / d or more.

Each of the obtained two types of special false twisted yarns of the present invention is composed of two yarns, one of which is a raw yarn and the other one is a textured yarn. The yarn quality was as shown in Table 2.

When the two types of the special false-twisted yarns of the present invention were gripped with a tension of 30 g and squeezed, no displacement phenomenon was observed. In addition, the elongation rates after applying a tension of 1 g / d for 1 second were 20% and 19.5%, which were substantially unchanged from before the application of tension.

On the other hand, for comparison, ethylene terephthalate-based copolyester multifilament yarn 37.5 d / f copolymerized with 2.5 mol% of isophthalic acid and polyester terephthalate polyester multifilament yarn 37.5 d / f
In the same brand as the above, differently from the characteristics shown in Fig. 4, polyester different shrinkage mixed yarn 75d / 48f in which the heat shrinkage stress does not reverse is relaxed under the processing conditions shown in Table 3 →
A false twisting process → a stretching process was performed to make a comparative processed yarn.

The textured yarn of this comparison had a bulge with many fine loops in appearance, but the crimped shape clearly became two layers, and one of them was not a raw yarn-like one, and 30g
Under tension, a so-called flow phenomenon was shown, and a deviation occurred with respect to ironing under this tension, and under 1 g / d of tension, the crimped shape of the entire yarn almost disappeared.

<Effects of the Invention> As described above, since the false twisted textured yarn of the present invention is processed by a single false twisted weight from a single yarn-shaped supply yarn, it has a high crimped filament and a low crimped filament. The difference in physical properties such as the difference in dyeability with the crimped filament and the difference in crimped form becomes uniform in the longitudinal direction of the yarn, and the quality is stable. Further, since the false twisted textured yarn of the present invention is a crimped mixed yarn in which filaments that do not substantially have a crimped shape are mixed, even though it is a false twisted crimped textured yarn, it can be used only in so-called raw yarn products. The glossiness and firmness of the waist are added. Furthermore, since the false twisted textured yarn of the present invention has no difference in yarn length between the individual filaments and the crimp shape does not change even under tension of 1 g / d, it is stable to the weaving and knitting process. Have.

In particular, if the cross section of the filament is a mushroom shape consisting of a substantially triangular umbrella and trunk, the porosity between the filaments is increased and the resulting fabric is given a swelling and warm taste, as well as a dry and crisp feeling. A rich silky texture can be obtained.

[Brief description of drawings]

FIG. 1 is a model diagram showing the appearance of the false twisted textured yarn of the present invention, and FIG.
FIG. 3 is a schematic process diagram showing an example of the method for producing a false twisted textured yarn of the present invention, FIG. 3 is a cross-sectional view showing an example of a single-filament filament of a different shrinkage mixed filament yarn used in the present invention, and FIG. FIG. 3 is a graph showing the relationship between the relaxation rate at 200 ° C. and the thermal stress of the high-shrinkage filament and the low-shrinkage filament of the different-shrinkage mixed filament yarn used in the above. (A) ... low crimp filament group that does not substantially exhibit a crimp shape, (b) ... high crimp filament group that clearly exhibits a crimp shape, (1) ... feed roller,
(2) ...... First heater, (3) ...... First delivery roller, (4) ...... Second heater, (5) ...... False twist spindle, (6) ...... Second delivery roller, (7) ...... Third delivery roller, (8) ... Winding roller, (9) ... Package, (Y) ... Different shrinkage mixed yarn.

 ─────────────────────────────────────────────────── --- Continuation of front page (56) References JP-A-58-81644 (JP, A) JP-A-48-61758 (JP, A) JP-A-48-72454 (JP, A) JP-A-56- 4726 (JP, A) JP-A-55-137234 (JP, A)

Claims (1)

[Claims] 1. A thermoplastic synthetic fiber heterogeneous mixed fiber in which filaments having a single yarn form and mixed with filaments in which thermal stress is reversed under a high relaxation rate and a low relaxation rate or under a stretched state are mixed. Was heat-treated under a high relaxation rate where the thermal stress of the low-shrinkage filament was lower than that of the high-shrinkage filament using a single processing weight, and then under the low relaxation rate or in the stretched state where the thermal stresses of both were reversed. A false-twisted yarn obtained by false-twisting with a low-crimping filament group having substantially no crimped shape and a high-crimped thread having a crimped shape clearly. It is composed of a crimpable filament group, and there is no substantial yarn length difference between the single yarn filaments, and the crimped shape is
A special false twisted yarn characterized by being substantially unchanged under a tension of 1 g / d.