JPH04316624A - Specific bulky yarn - Google Patents

Abstract

PURPOSE:To provide a specific bulky yarn suitable for woven or knit fabrics having excellent dry touch and softness. CONSTITUTION:A specific bulky yarn consists of a sheath-core type combined and interlaced multifilament yarn comprising core thermoplastic filaments and sheath thermoplastic filaments, the constituting ratio of the core filaments being 30-70%. The core filaments comprise false-twisted crimped filaments each having a specific modified cross section with three to eight radial lobes and having a modified cross-sectional index of >=2.0. The sheath filaments comprise false-twisted crimped filaments whose single filament is thinner than that of a single filament in the core filaments.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a special bulky textured yarn that can be made into a woven or knitted fabric having a special texture that combines crispness and softness.

0002

[Prior Art] Conventionally, processed yarns using thermoplastic multifilament yarns to give a special texture with a crisp feel include: ■Partially fused yarns that are false-twisted in the fusion high temperature region;
■False-twisted yarn with special texture using special irregular cross-section yarn described in Japanese Patent Publication No. 62-54892, ■Japanese Patent Publication No. 63-9274
Composite yarn having two or more recesses in the cross-sectional direction described in Publication No. 1, which is a mixture of a multifilament yarn with a single filament of 2 deniers or more and a multifilament yarn with a single filament of 1 denier or less , etc. have been proposed.

[0003] However, since the partially fused yarn (2) above is obtained by false twisting in the fusion high temperature range, the degree of fusion may change due to the physical properties of the supplied yarn or slight differences between the spindles. The disadvantage is that it is easy to remove, and fabrics with stable quality and texture cannot be obtained. Next, the specially textured false-twisted yarn in item (■) has two or more interlaced parts/m, but these intertwined parts are where the leaves of the two yarns interlock with each other during the false-twisting process. Since it is formed by intertwining, the intertwining property is weak, and there is a problem that the intertwined portions come undone during high-order processing in the subsequent process, impeding weaving and weaving properties. Furthermore, in the composite yarn of item (■) above, a plain yarn with a single filament of 1 denier or less is used as the yarn to be composited with the irregular cross-section yarn.
During fluid treatment, opening defects peculiar to ultrafine yarns occur, resulting in a marked decrease in entanglement, making it impossible to obtain yarns of stable quality. Further, the irregular cross-section yarn constituting the above-mentioned composite yarn had poor shirring effect due to its cross-sectional shape, and the resulting fabric was also non-stretchable.

0004

[Problems to be Solved by the Invention] The present invention solves the above-mentioned conventional drawbacks, has excellent smoothness and softness, and does not change shape due to tension applied during weaving, and significantly improves the quality of woven and knitted products. The technical objective is to provide a special bulky textured yarn that can be processed.

[0005]

[Means for Solving the Problems] The present invention provides a single filament having a specially shaped cross-section consisting of 3 to 8 radial leaves, a modified section modulus of the cross section being 2.0 or more, and a false-twisted single filament. A core-sheath mixed interlaced yarn in which the core yarn is a thermoplastic multifilament yarn having crimps, the single filament is thinner than the core yarn, and the sheath yarn is a thermoplastic multifilament yarn having false twist crimp. , and the composition ratio of core yarn is 30~
The gist is a special bulky textured yarn characterized by a 70%. The present invention will be explained in detail below.

The special bulky yarn of the present invention is a core-sheath mixed interlaced yarn in which a crimped yarn having a special irregular cross-section of a single filament of 3 to 8 leaves is arranged as a core yarn. The special irregular cross-section threads arranged in the wafer are an important point in creating the crisp feel that is a feature of the present invention. Therefore, first, this special irregular cross-section yarn will be explained.

FIG. 2 is a diagram showing an example (four leaves) of the cross-sectional shape of the special irregular cross-section yarn used in the present invention. In Fig. 2, draw an inscribed circle passing through any three points of recesses a, b, c, and d,
The maximum inscribed circle X is called the central nucleus, the radius of this circle X is "r", and the center of the circle is "O". The protrusion-like pieces Y1, Y2, Y3, Y4 are called "leaves", and the points where a line drawn from the center O toward the tip of the leaf intersects the center of the tip of the leaf are y1, y2, y3, y4, and the center O and y1
, y2, y3, y4 lines Oy1, Oy2, Oy3
, Oy4 is called the leaf length "β". Here, the ratio between the leaf length β and the radius r of the inscribed circle of the central nucleus is β/
r is defined as the irregular section modulus. The texture of the yarn differs depending on the size of the modified section modulus, and the greater the coefficient, the more the texture increases. Although a four-lobed cross-sectional shape has been described as the cross-sectional shape of the special irregular cross-section yarn, the same applies to cases of three to eight leaves, and the explanation will be omitted.

As shown in an example of the cross section of the special bulky yarn of the present invention, as shown in FIG. 1, two groups of single filaments constituting the sheath yarn surround one group of single filaments constituting the core yarn. They are intertwined, and there are various types of intermingling, such as the leaves of single filament 1 interlocking with each other, the single filament 2 biting into the recess of single filament 1 and intertwining, or the single filaments 2 intertwining with each other. It has a form. With such a yarn configuration, it is possible to create a yarn that has both slickness and softness.

As the core yarn constituting the special bulky textured yarn of the present invention, it is necessary to use a special irregular cross-section yarn having a single filament with a radial cross-sectional shape of 3 to 8 false twisted crimps. By using this special irregular cross-section yarn, it becomes possible to impart a crispy taste. However, if the cross-sectional shape is other than 3 to 8 lobes, for example, 2 lobes are flattened yarns that do not have concave portions, the texture will be poor and the entangling property will be poor. On the other hand, if the number of leaves is nine or more, the recesses between the leaves become narrow and circular due to the cross-sectional shape, which is not preferable because the crunchy taste becomes poor.

Furthermore, what is important in imparting a silky feel is that the special irregular cross-section yarn has a modified section modulus of 2.0 or more. When the modified section modulus is less than 2.0, the cross-sectional shape approaches a circular shape, the texture is lacking, and the desired texture cannot be obtained. There is no particular limit to the upper limit of the modified section modulus, but if it exceeds 6.5, it will be difficult to obtain a stable yarn in manufacturing, and even if it is obtained, leaves may be missing during false twisting or fluid treatment. This is undesirable because phenomena tend to occur and it is difficult to achieve satisfactory results in terms of operation and quality.

[0011] In addition to the above-mentioned shaving effect, since the core yarn has a unique gear-like cross-sectional shape, when it is combined with other yarns, other yarns may enter the recesses between the leaves. Enter,
It also has the effect of improving conjugation and confounding.

In addition to the above-mentioned cross-sectional shape, the expression of a soft, silky texture is also influenced by the fineness of the single filaments constituting the core and sheath yarns. Therefore, when considering the synergistic effect with the cross-sectional shape of the leaves, the fineness of the single filament constituting the core yarn is 2 to 30 deniers, especially 5 to 20 deniers.
Denier is preferred. If the fineness of the single filament is less than 2 denier, it becomes difficult to obtain a stable raw yarn in terms of manufacturing, and the texture also tends to deteriorate. On the other hand, if the fineness of the single filament exceeds 30 denier, the fabric becomes hard and its value as a product decreases.

Next, the sheath yarn will be explained. The purpose of the sheath yarn is to provide a soft surface touch and volume in addition to the silkiness of the core yarn. Therefore, it is necessary to use a false-twisted crimped yarn that is thinner than the single filament of the core yarn and is crimped, and a false-twisted crimped yarn of 1 denier or less is preferable.

Furthermore, since the sheath yarn has crimps, it has the following effects in addition to the above. In other words, the special bulky processed yarn of the present invention is obtained by fluid mixing and entangling a yarn that becomes a core yarn and a yarn that becomes a sheath yarn whose single filament is finer than the core yarn. , When processing ultrafine yarns with small fineness, especially less than 1 denier, by fluid mixing and entangling,
If the filaments are left as raw threads, the filaments will not spread easily and the entanglement will be significantly reduced. However, in the present invention, by using a false twisted crimped yarn as a sheath yarn with a small fineness, voids are formed between the filaments, and compressed fluid enters the voids, so that the filaments can be spread easily.
The fluid disturbance effect is performed smoothly and entanglement is improved.

[0015] The special bulky textured yarn of the present invention needs to have a core yarn composition ratio of 30 to 70%. When the composition ratio of the core yarn is less than 30%, the composition ratio of the sheath yarn becomes too large, and the softness is emphasized too much, resulting in a poor silky feel. Furthermore, if the composition ratio of the core yarn exceeds 70%, the yarn will be too stiff and stiff, and will lack softness.

Furthermore, the special bulky textured yarn of the present invention has a yarn length difference of 4% between the sheath yarn and the core yarn, taking into consideration the interlacing surface and soft feel.
It is preferable to set it as above.

As described above in detail, the special bulky yarn of the present invention is a core-sheath mixed interlaced yarn in which a special irregular cross-section yarn is used as the core yarn and a crimped yarn whose single filaments are thinner than the core yarn is used as the sheath yarn. Therefore, it has excellent shirring and softness, and since both the core yarn and sheath yarn are crimped yarns, it is possible to obtain a fabric with high elasticity when knitted and woven. In addition, the synergistic effect of the crimped yarn of the sheath yarn and the special cross-sectional shape of the core yarn results in a yarn with excellent shape robustness, and the intertwined portions do not unravel even when subjected to tension during weaving and weaving, resulting in stable quality. It can be made of fabric.

[0018] The special bulky textured yarn of the present invention is obtained by fluid-mixing and entangling a yarn serving as a core yarn and a yarn serving as a sheath yarn. Any type of processing may be used, but taslan processing is preferable in order to form loop fluff and express a span-like appearance.

Next, an example of the method for manufacturing the special bulky textured yarn of the present invention will be explained with reference to FIG. The yarn 3 and the yarn 4 are fed to a false twisting area by a feed roller 5 and a feed roller 6, respectively. In this case, the yarn 4 is supplied in excess so that the yarn 3 becomes the core yarn and the yarn 4 becomes the sheath yarn. Both threads are
The yarn is doubled at the top of the twist fixing heater 7, and then the twist fixing heater 7
A false twist crimp is applied by a false twist spindle 8. In this case, since the feeding rates of yarn 3 and yarn 4 are different, the yarn 3 becomes a crimped yarn in the form of winding yarn 3 with yarn 3 as a core yarn, and is sent out by the first delivery roller 9. It will be done.

Next, the yarn sent out from the first delivery roller 9 is continuously introduced into a fluid jet nozzle 10 where it is mixed and entangled, passed through a second delivery roller 11, and then taken up by a take-up roller 12. It is rolled up into a package 13.

[0021] The thermoplastic multifilament yarn as used in the present invention is a multifilament made of a polymer having fiber-forming ability such as polyester, polyamide, polypropylene, or the like. If you use a combination of yarns with different dyeability, such as polyester and polyamide or regular polyester and cationically dyeable polyester, as the multifilament core yarn and sheath yarn, you can change the heathered tone and texture. It is possible to obtain a special bulky textured yarn that becomes a richly woven or knitted fabric.

[0022]

[Example] Next, the present invention will be explained in detail with reference to an example. Examples 1 to 3, Comparative Examples 1 to 4 Special bulky processed yarns were manufactured according to the manufacturing process shown in FIG. 3 and under the conditions shown in Table 1.

[0023]

[Table 1]

[0024] As is clear from Table 1, in Examples 1 to 3 of the present invention, special bulky textured yarns with good entangling properties between the filaments were obtained. In addition, the fabric using this processed yarn had both a silky feel and a soft feel, and was of good quality.

[0025] On the other hand, the textured yarn obtained in Comparative Example 1 lacks crispness because the composition ratio of the core yarn is less than 30%.
The processed yarns obtained in Comparative Examples 2 and 3 lacked a crispy feel due to the cross-sectional shape of the core yarn. Furthermore, since the processed yarn obtained in Comparative Example 4 was not subjected to fluid treatment, it had poor entangling properties and poor weaving and weaving properties.

[0026]

Effects of the Invention As described above, the special bulky yarn of the present invention uses a special irregular cross-section yarn with 3 to 8 lobes of crimps as the core yarn, and has single filaments with narrower crimps than the core yarn as the sheath yarn. Because it is a core-sheath mixed interlaced yarn using yarn, the yarn has excellent shape robustness, and it is possible to impart a crisp feel and softness to the fabric obtained by knitting and weaving this processed yarn. It is something.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the special bulky textured yarn of the present invention.

FIG. 2 is an explanatory diagram showing one embodiment of a single filament constituting a yarn serving as a core yarn in the present invention.

FIG. 3 is a schematic process diagram showing an example of the method for producing the special bulky textured yarn of the present invention.

[Explanation of symbols]

1 Single filament that makes up the core yarn 2 Single filament that makes up the sheath yarn

Claims (1)

[Claims] 1. A thermoplastic multifilament in which the cross-sectional shape of a single filament is a special irregular cross section consisting of 3 to 8 radial leaves, the irregular section modulus of the cross section is 2.0 or more, and has false twist crimp. A core-sheath mixed interlaced yarn in which the yarn is the core yarn, the single filament is thinner than the core yarn, and the sheath yarn is a thermoplastic multifilament yarn with false twist crimp, and the composition ratio of the core yarn is A special bulky processed yarn characterized in that the yarn is 30 to 70%.