JPS6317135B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a kasuri-like false-twisted two-layer structured yarn with a silky texture.

Conventionally, yarns with thick and thin spots due to stretching (so-called thick-and-thin yarns) were individually false-twisted to produce Kasuri-like textured yarns with a shirring effect. Are known. However, since the base thread of this type of yarn is bulky due to crimping, it does not have the slickness that is required for practical use, and if the entire yarn is fused together, it is too hard. Ta. In addition, such yarns undergo thermal deterioration in the fused and darkly dyed portions, resulting in low strength and difficulty in weaving. In order to solve this problem of weavability, it is known that a yarn with uneven stretching and a uniform yarn are aligned and subjected to a false twisting process, but like the above-mentioned yarn, this yarn also lacks a smooth feel. Ta.
An object of the present invention is to eliminate such drawbacks and provide a Kasuri-like textured yarn that has a luxurious and silky feel.

As a result of various studies aimed at achieving the above object, the inventors of the present invention found that by processing the thick-and-thin yarn alone or with other yarns, yarn strength, a silky feel, and a kasuri-like effect can coexist. However, if the thick and thin yarn is wound around the core thread in an alternately twisted form, it will exhibit excellent weavability and Kasuri-like effect, and will also have excellent weavability and kasuri-like effect. I learned that it is possible to obtain processed yarn that also has a wind-like texture.

That is, the present invention provides a false-twisted two-layer structured yarn in which thick-and-thin yarns are alternately twisted around a core yarn, and (a) the thin portions of the thick-and-thin yarns are alternately twisted. (b) The thick part of the thick-and-thin yarn is twisted and twisted or twisted in the direction opposite to the twisting direction of the false twisting process. Effect parts B, which are wound in the twisting direction of the twisting process and dyed deeply by dyeing, are alternately arranged along the yarn axis direction, and the other part (c) is formed by fusing the core yarn to form the core yarn and the winding. It is a double-layered yarn with a Kasuri-like false twist structure that has a fixed interface with the thread.

To further explain the present invention in detail, Fig. 1 shows a specific example of the yarn according to the present invention, which is a two-layered yarn consisting of a core yarn 1 and a wrapped yarn 4 made of thick and thin yarn, and is dyed. Ground thread part A to be light dyed
(the part where the thin part of the thick and thin yarn is wrapped) and the effect part B (the part where the thick part of the thick and thin yarn is wrapped) which is darkly dyed. Here, the ground yarn part A is wound in the opposite direction (one direction) to the twisting direction of alternate twisting or false twisting, and the effect part B is unidirectionally twisted (same direction as the twisting direction of false twisting). These twisted windings give the thread as a whole a smooth texture similar to that of a twisted thread. Furthermore, when the winding thread 4 of the effect part B is fused, the fusion and the effect of continuous twisting and winding in one direction further enhance the crispness. At the same time, since the effect part B is a part with low orientation and is dyed darker than the ground thread part A, a splashed pattern appearance effect can be obtained.

Here, depending on the application, the alternate twist winding of the ground yarn part A may be squeezed in the subsequent process and slip, resulting in neps, so in such cases, the core yarn 1 is fused and The interface between the wound thread 4 and the wrapped thread 4 is fixed.

Note that the winding direction of the winding yarn 4 in the ground yarn portion A changes depending on the frequency of the effect portion B. In other words, if there is a large number of effect areas B, part A will be wound almost in the opposite direction to the effect area B, and on the other hand, if there are fewer effect areas B, the part A will be wound alternately with a slight twist in the false twist direction. . FIG. 2 shows an example of the process of making the processed yarn of the present invention.

The core yarn 1 is fed by a first feed roller 2, and is subjected to a rotational force by a false twisting device 3 to be in a false twist state. On the other hand, the wound yarn 4 is fed through a second feed roller 5 and a guide 9 so as to be wound around the false-twisted core yarn 1' by its rotational force. In this state, the yarn is heated by a heater 6, passed through a false twisting device 3 and a delivery roller 7, and then wound into a winder 8 to obtain a two-layer structured yarn in which the wound yarn is wound around the core yarn.

Here, a substantially uniform yarn is used as the core yarn, and a yarn with thick and thin drawing irregularities, for example, is used as the winding yarn. If the degree of thickness is expressed as the degree of birefringence (△n), the thick part is △n = 15 to 80 × within any cross section of the thread.
10 ^-3 single fibers account for more than 1/4 of the total number of constituent fibers,
On the other hand, for the thin part, a yarn in which single fibers of Δn=100 to 200×10 ⁻³ account for 1/10 or more of the total constituent fibers is suitable.
In addition, in terms of the abrasion strength of the woven or knitted material, it is preferable that at least 1/4 of the thick portions are made up of highly oriented fibers rather than all of the constituent single fibers being composed of poorly oriented fibers.

Especially when fusing the core yarn in the above process,
As the core yarn 1, undrawn yarn or highly oriented undrawn yarn that can be drawn and false twisted is suitable. Of course, in this case, as the winding yarn 4, a yarn whose base yarn portion generally has a higher heat-sealing temperature than the core yarn 1 is used. In addition, if such undrawn yarn is used and a draw ratio lower than that in the so-called ordinary draw false twisting process is used, the temperature at which core yarn fusion occurs will be lower, the heater temperature can be set lower, and it is more economical. It has the advantage of being able to prevent heat fusion of the wrapped yarn portion. For example, elongation is 120%,
When polyethylene terephthalate yarn (115de/36fils) with a natural draw ratio of 1.35 times is processed at a draw ratio of 1.5 times as used in ordinary stretch false twist processing, the fusion start temperature will be 255°C, but if the draw ratio is set near the natural draw ratio When processed at 1.3 times the temperature, the temperature at which fusion starts will be 235°C.

In addition, when drawn yarn is used as the core yarn,
Although elongation tends to decrease due to fusing, elongation of 30% or more can be ensured when drawing and false twisting is performed using undrawn yarn or highly oriented undrawn yarn.

In the present invention, polyethylene terephthalate polymer is most preferred as the core thread and the winding thread, but other materials may be used depending on the purpose.

Further, the number of false twists is preferably in the range shown by the following formula with respect to the processed yarn denier.

The false twisting temperature in this case may be selected within the range of 200 to 240°C depending on the application, such as when only the darkly dyed portion of the wrapped yarn is fused, or when the core yarn is also fused.

As described above, according to the present invention, the thick-and-thin yarn is wrapped around the core thread as a tension or strong carrier by false twisting, so the Kasuri-like textured yarn has a high-quality, twisted yarn-like texture. is obtained.

Example Highly oriented undrawn yarn of polyethylene terephthalate
115 de, 36 fils (spinning speed 3300 m/min) was used as the core yarn, and on the other hand, a drawn polyethylene terephthalate yarn having thick and thin spots (a yarn obtained by drawing an undrawn yarn spun at a spinning speed of 1300 m/min and stretching it with low temperature spots at a draw ratio of 2.2).
Using 50de and 48fils as the winding yarn, the processing temperature is 240℃, the number of false twists is 2330T/m (Z twist), and the processing speed is as shown in Figure 2.
100m/min, overfeed rate of wrapped yarn 80%
(pair-to-core yarn feed speed) and the false twist draw ratio was 1.3 times.

Furthermore, the heat fusion temperature of the core yarn at this stretching ratio is 235
It was ~240℃.

The obtained processed yarn has a structure as shown in Figure 1, in which the winding yarn in the effect part is fused, the core yarn is also partially fused, and the interface with the winding yarn is fused. Adhesion was observed. When this thread was woven and dyed, a kasuri-like fabric with a silky texture was obtained.

[Brief explanation of the drawing]

FIG. 1 is a model diagram showing one aspect of the yarn structure of the present invention, and FIG. 2 is a schematic diagram showing one aspect of the apparatus for manufacturing the processed yarn of the present invention. A: Ground thread part, B: Effect part, 1, 1': Core thread,
2: first feed roller, 3: false twisting device, 4: winding yarn, 5: second feed roller, 6: heater,
7: Delivery roller, 8: Winder, 9: Guide.

Claims (1)

[Scope of Claims] 1. A false-twisted two-layer structure yarn in which wrapped yarns of thick-and-thin yarn are wound around a core yarn in an alternating twisted yarn pattern, comprising: (a) a thin part of the thick-and-thin yarn; (b) The thick part of the thick-and-thin yarn is wrapped in alternating twists or wrapped in a twist direction opposite to the twisting direction of the false twisting process. Effect parts B, which are wound in the twisting direction of the twisting process and dyed deeply by dyeing, are alternately arranged along the yarn axis direction, and the other part (c) is formed by fusing the core yarn to form the core yarn and the winding. A kasuri-like false-twisted double-layer yarn with a fixed interface with the thread. 2 Claim 1 in which the effect part B is fused
A kasuri-like false-twisted double-layered yarn with a silky texture as described in the section.