JPS6241335A - Crimped 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> The present invention relates to a crimped yarn that has an appearance and feel similar to woolen yarn and does not shift when subjected to ironing during knitting and weaving.

<Prior art> Conventionally, the false-twisted crimped yarn obtained by false-twisting thermoplastic synthetic fiber filament yarn becomes extremely bulky under micro-tension, which is close to zero tension. The disadvantage is that most of its bulkiness is lost if it is In addition, two multifilament yarns with different elongations are used as a supply system, and they are aligned and false twisted to create a 2N yarn with high elongation multifilament yarn in the outer layer and low elongation multifilament yarn in the inner layer. Structured crimped yarns are also known. Even when such crimped yarn is subjected to tension during weaving and weaving, most of the tension is applied to the core yarn and almost no tension is applied to the sheath yarn, so it is possible to form a fabric while maintaining its bulkiness and give it a voluminous feel. However, since there is no entanglement between the core yarn and sheath yarn, they easily shift due to slight strokes during weaving and knitting. Therefore, if the fabric is knitted or woven with the lumps generated due to this misalignment scattered in the longitudinal direction, the resulting fabric may have defects and cannot be used practically. Furthermore, in order to proactively eliminate the displacement of the sheath yarns caused by such straining, a method has been proposed in which two multifilament yarns are manufactured by subjecting them to air entanglement treatment in advance (Japanese Patent Laid-Open No. 55-98931). However, the texture of the processed yarn obtained by this method has a large number of convergence points due to the entangling process, and as a result, the soft feel, voluminous feel, and slimy feel are reduced.

<Problems to be Solved by the Invention> The present invention was made in order to eliminate the drawbacks of the conventional 2N structured yarn as described above, and it has a naturally uneven texture and soft texture similar to wool spun yarn. .

The object of the present invention is to obtain a crimped yarn that can give a sense of volume and depth in two colors, and that does not shift even when ironed during weaving and weaving.

<Means for solving the problems> That is, 1. The present invention has a two-layer structure of a multifilament yarn made of crimped filaments and having thick and thin spots in the longitudinal direction and another multifilament yarn, and 1. A two-layer multifilament yarn. The filaments constituting the multifilament yarn are locally intertwined with each other, and a real twist portion is partially formed in the longitudinal direction of the yarn, and the tear strength required to separate both multifilament yarns is 5 g or more. The gist is crimped yarn.

Hereinafter, one aspect of the present invention will be explained in detail.

First, the crimped yarn of the present invention consists of a multifilament yarn A having thickness irregularities (fineness irregularities) in the longitudinal direction and another multifilament yarn B, and these multifilament yarns have a 2N structure. It is.

Multifilament yarn A having thick and thin spots in the longitudinal direction is 1
Usually made of thermoplastic synthetic fibers, the individual filaments constituting this multifilament yarn A are crimped and have thick and thin irregularities in the longitudinal direction. Further, the other multifilament yarn B mentioned above is a yarn having substantially no thick and thin irregularities in the longitudinal direction of two ordinary yarns. The multifilament yarn B is preferably made of thermoplastic synthetic fibers and crimped filaments, but may also be made of non-thermoplastic fibers such as recycled cellulose fibers.

As mentioned above, the multifilament yarns A and B have a two-layer structure, but a 2N structure in which the multifilament yarn A is mainly arranged in the outer layer of the yarn and the multifilament B is mainly arranged in the inner layer is preferable. .

Next, the crimped yarn of the present invention is one in which the filaments constituting the multifilament yarn A and the other multifilament yarn B are locally entangled with each other, and a real twist portion is formed in the longitudinal direction of the crimped yarn. It is. The intertwining of the filaments is formed by partially intertwining each of the filaments constituting the nine-strand multifilament yarn, and is locally scattered in the longitudinal direction of the yarn. The actual twisted portion is an untwisted portion formed during the false twisting process, as will be described later.

Furthermore, the crimped yarn of the present invention must have a tear strength of 5 g or more to separate the multifilament yarns A and B. This tear strength is due to multifilament yarn A
It indicates the degree of conjugation between and B, that is, the strength of the entanglement between the two multifilament yarns, and if this tear strength is less than 5 g, it is not preferable because shearing tends to occur during ironing. On the other hand, if the entanglement between the two multifilament yarns is too strong, the bulkiness of the crimped yarn may decrease. Therefore, the tear strength is 5g~200
g is preferable, and a range of 10 g to 100 g is particularly preferable.

Here, tear strength is 14! Separate the yarn end of the curled yarn into two multifilament yarns, sandwich the separated yarn ends between the upper and lower clamps of a constant speed tensile tester, and measure the strength of the yarn while separating at a constant speed. This is the highest value of the strength of this separation.

Two crimped yarns of the present invention will be explained below using illustrated examples.

FIG. 1 is a schematic side view showing an example of the crimped yarn of the present invention, which is composed of a multifilament yarn A having thick and fine irregularities in the longitudinal direction of the yarn and another multifilament yarn B. The multifilament yarn A is mainly arranged in the outer layer part, and the multifilament yarn B is mainly arranged in the inner layer part, forming a 22-layer structure. The multifilament yarn A is composed of a plurality of multifilaments a having thick and thin spots consisting of a thick part a1 and a small part a2, and the filaments a have crimps. Further, the other multifilament yarn B consists of normal filaments b that are substantially free from thick and thin spots, and the filaments b also have crimps. Furthermore, an entangled portion C is locally formed in which some of the filaments a that make up the multifilament yarn B are intertwined with some of the filaments b that make up the multifilament yarn B. , and a real twist portion d exists partially in the longitudinal direction of the yarn due to both the multifilament yarns A and B.

Next, a method for manufacturing the crimped yarn of the present invention will be explained.

The crimped yarn of the present invention is basically obtained by false twisting a multifilament yarn having thick and thin irregularities in the longitudinal direction of the yarn and another multifilament yarn. As a multifilament yarn having thick and thin spots, highly oriented undrawn yarn 1 obtained by high-speed spinning, for example, a highly oriented undrawn yarn with a birefringence Δn of 20 to 80 x 10-' is once heat-shrinked and irregularly crimped. It is preferable to use a yarn having thick and thin irregularities obtained by cold drawing after imparting.

In addition, there are thick and thin yarns made by neck-stretching undrawn thermoplastic synthetic fiber multifilament yarns, and yarns made by fixing resin-like liquid or fine powder to form thick and fine spots in the longitudinal direction of the yarn. Can be used. Also, as other multifilament yarns.

Thermoplastic synthetic fibers or non-thermoplastic fibers are used.

When the multifilament yarn with thick and thin spots as described above and other multifilament yarns are aligned and false twisted,
Migration of the inner and outer layers of the filament occurs unevenly during false twist heating.

As a result, the filaments constituting the two types of multifilament yarns are locally entangled with each other, and nine untwisted portions are formed. Also.

A crimp difference occurs in the longitudinal direction of the filaments of the multifilament yarn having thick and thin spots. In the above false twisting process,
When the elongation of the multifilament yarn having thick and thin spots is greater than that of other multifilament yarns, the multifilament yarn having thick and thin spots is mainly arranged in the outer layer part, and the other multifilament yarns are mainly arranged in the inner layer part. . When the elongation of both multifilament yarns is opposite to the above.

The arrangement of both multifilament yarns is opposite.

The formation of the above-mentioned entanglements and untwisted portions is achieved by adjusting the false twisting conditions 1, for example, the tension, depending on the composition and form of the two-strand multifilament yarn. Although it depends on the false twisting conditions, entanglement between filaments and untwisted portions are more likely to be formed when thermoplastic multifilament yarn is used as the other multifilament yarn.

When a multifilament yarn with thick and fine spots and another thermoplastic multifilament yarn are aligned and subjected to false twisting, crimps are imparted to the 9-strand multifilament yarn, and a crimp difference occurs between the filaments of the 1-strand multifilament yarn. In combination with the crimp difference in the longitudinal direction of the filaments of the multifilament yarn having thick and thin spots, the yarn is given bulge, and,
The filament near the main part of the filament having thick and thin spots undergoes torsional deformation to a greater extent, and a crimp phase difference occurs, which greatly contributes to the swelling.

In order to effectively express the crimp difference as described above, the highly oriented undrawn yarn is once heat-shrinked.

It is preferable to use a multifilament yarn having thick and thin spots obtained by cold drawing. Further, as the multifilament yarn having thick and thin spots to be subjected to the false twisting process, one having an elongation of 40% or more is preferably used, and is placed in the outer layer of the crimped yarn.

FIG. 2 is a process schematic diagram showing a method for manufacturing the crimped yarn of the present invention.

The highly oriented undrawn polyester multifilament yarn (Yl) pulled out from the fabric loop (1) is placed in a non-contact state by the first heater (4) between the feed roller (3) and the first delivery roller (5). After passing through the first delivery roller (5), the first delivery roller (5)
and a second delivery roller (6) to form a multifilament yarn having thick and thin irregularities. The yarn having the thick and thin spots is pulled out from the pirn (2), aligned with another multifilament yarn (Y2) supplied to the supply side of the second delivery roller (6), and then passed through the second delivery roller (6). ), it is heated by a false twisting spindle (8) and heat-set by a second heater (7), passed through a third delivery roller (9), and then rolled up into a puff cage (11) by a winding roller (10). According to this method, the highly oriented undrawn multifilament yarn is once shrunk by relaxation heat treatment to give it crimps and irregularities in fineness. Local entanglement with other multifilament yarns is likely to occur. The reason is.

It is thought that crimp and uneven fineness caused by shrinkage during relaxation heat treatment affect the behavior of the filament during false twisting.

Effect> The crimped yarn of the present invention has an uneven feel and a slimy appearance due to the presence of the multifilament yarn, which is made of crimped filaments and has thick and thin spots in the longitudinal direction. A certain feel is given. In particular, when the multifilament yarn having thick and thin spots is mainly arranged in the outer layer of the yarn, the above effect is particularly remarkable.

In addition, since the multifilament yarn with thick and fine spots and other multifilament yarns form a two-layer structure, the spacing between the filaments is widened, creating a soft texture with fullness, a sense of volume, and depth of one color. can give.

Furthermore, due to differences in physical properties such as differences in elongation between two multifilament yarns, a difference in crimp exists, which promotes a feeling of fullness.

Furthermore, there are local entanglements between filaments and real twist portions formed in the longitudinal direction of the yarn.

Since the tearing strength required to separate both multifilament yarns is 5 g or more, both multifilament yarns will not shift from each other even when ironing is applied during weaving and weaving, and lumps will not occur due to displacement. do not have.

<Example> The present invention will be specifically explained below by way of nine examples.

Example A highly oriented undrawn polyester multifilament yarn (230 denier/48 filament) with a birefringence (Δn) of 51×10'' obtained by high-speed spinning of polyethylene terephthalate was prepared according to the manufacturing process shown in FIG. The yarn was subjected to relaxation heat treatment under the conditions shown in Table 1, and then stretched under the conditions shown in Table 1 to obtain a yarn having thick and thin irregularities. The elongation at break of this yarn was 108%, and the yarn unevenness measurement value U% measured using a yarn unevenness tester manufactured by Worcester was 17%. This thread.

The drawn polyethylene terephthalate multifilament yarn 75 denier/24 filament (breaking elongation 32%) was aligned and false twisted under the conditions shown in Table 1 to obtain two crimped yarns of the present invention. Table 1 The obtained crimped yarn has a two-layer structure in which multifilament yarns mainly having thick and thin spots are arranged around the outer periphery of the multifilament drawn yarn, and both multifilament yarns are locally arranged in the longitudinal direction of the yarn. There is a part where some of the filaments of the filament thread are intertwined.

In addition, it had a real twisted portion (untwisted portion) in which both multifilament yarns were partially bundled in the longitudinal direction of the yarn and twisted in the false twisting heating direction. When the binding property of this crimped yarn was evaluated, the tear strength was 25 g. When the crimped yarn was woven using the warp and weft yarns of a hand-woven structure and subjected to the usual dyeing process, the result was a slimy, voluminous, and voluminous feel.
Softness.

It has excellent firmness and waist, and has a unique effect due to the thick dark colored parts and light colored parts of the thick and thin thread, and has the depth of color of a wool spun yarn net, and is equivalent to a cloth made from wool spun yarn with a marbled tone. The texture was obtained.

<Effects of the Invention> Since the crimped yarn of the present invention has the above-mentioned configuration,
It has a naturally uneven texture and slimy feel similar to wool spun yarn, and can provide a soft, plump texture, a sense of volume, and depth of color. Moreover, it does not shift due to ironing during weaving, weaving, etc.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an example of the crimped yarn of the present invention;
FIG. 2 is a process schematic diagram showing an example of the method for manufacturing the crimped yarn of the present invention. a - Filament constituting a multifilament yarn with thick and thin spots b - Filament C constituting another multifilament yarn C... Tangled part d - Real twist part

Claims (2)

[Claims] (1) A multifilament yarn made of crimped filaments and having thick and thin spots in the longitudinal direction and another multifilament yarn form a two-layer structure, and the filaments constituting both multifilament yarns are locally entangled with each other, and A crimped yarn characterized in that a real twist portion is partially formed in the longitudinal direction of the yarn, and the tear strength required to separate both multifilament yarns is 5 g or more. (2) The crimped yarn according to claim 1, wherein the other multifilament yarn is a thermoplastic synthetic fiber multifilament yarn.