JPH1112867A - Production of composite textured yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composite textured yarn having a wool-like or silk-like feeling and hot causing irregularity such as streaky defect in a state of fabrics. SOLUTION: This composite textured yarn is obtained by giving one yarn A a bundling property with an interlacing nozzle 4 and heating it with a hot plate 5 up to higher temperatures, and by doubling the other yarn B with the yarn A at a lower temperature than that of the yarn A, and then false-twisting them with a spinner such as a false-twisting rotor 7. The yarn B is irregularly heat-treated by the yarn A during a false-twisting process and therefore we can obtain the composite textured yarn having a soft feeling and sufficiently having body, stiffness and resiliency and having excellent uniformity in shape and dimensions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite processed yarn, and more particularly, to a composite processed yarn having excellent form uniformity which is soft, stretchable, rich in stiffness and rebound, and which does not generate streaks when formed into a fabric. The present invention relates to a method for producing a yarn.

[0002]

2. Description of the Related Art Conventionally, as a composite processed yarn, two yarns having a difference in elongation have been aligned and false twisted, or two yarns having different feed rates have been false twisted. There is known a method of obtaining a composite processed yarn having a core-sheath structure by processing. However, the composite processed yarn obtained by the conventional method has a high crimping property and a high bulkiness, so that it has a large feeling of feeling in terms of feeling and a glitter unique to false twisted processed yarn. Having it was a problem from the point of aesthetics.

[0003] As a measure against the former high crimpability and high bulkiness, the twisting of medium-strength twist is suppressed to suppress the feeling of fluttering. As a measure against the glitter, the use of a yarn having a polygonal cross section is used. Although there are measures to alleviate this, all of these measures were not necessarily satisfactory measures because they would increase costs.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is not to have the drawbacks of the above-mentioned conventional composite yarn, but to have the feel of wool or silk, that is, to be soft, stretched, and to have a high waist and rebound. Moreover, it is an object of the present invention to provide a production method for obtaining a composite processed yarn having excellent morphological uniformity which does not cause uneven streaks when formed into a fabric.

[0005]

A method for producing a composite textured yarn according to the present invention, which achieves the above object, comprises a high-temperature yarn which has been subjected to a bundling treatment and a heat treatment, and a yarn which has a lower temperature than the yarn. The yarns having a temperature difference of at least two are combined and false-twisted, and during the false twisting, the high-temperature yarn is used to heat-treat the low-temperature yarn.

[0006] When at least the high-temperature yarn thus heat-treated and the low-temperature yarn are combined and false-twisted, heat is transferred between the mutual yarns, and the low-temperature side yarn is transferred. The yarn is non-uniformly heat-treated in the yarn axis direction and the diametric direction by the high-temperature side yarn, causing a change in the internal structure and the fiber shape within and between the single yarns. This change causes a non-uniform and short-period thick and thin structure in the yarn axis direction of the single fiber by heat treatment for free, and a plurality of streaky indentations in the diameter direction of the single fiber, It exhibits a crimp in the form of a slow wave that does not resemble the conventional false twisted yarn. Further, since the cross-sectional deformation is small, the glitter peculiar to false twisted yarn can also be improved.

This phenomenon causes the shrinkage and the Young's modulus to change in a short cycle in the yarn axis direction of a single fiber from the viewpoint of the physical properties of the fiber. Then, unique structures such as short-period morphological differences, shrinkage differences, and crimp differences are manifested in the fabric, and minute voids and deviations are formed between the single fibers. Such fine voids and misalignment give the fabric a soft tension, waist and resilience of wool feel.

Further, in the present invention, since at least the high-temperature side yarn is given a sizing property in advance, the high-temperature side yarn is changed to the low-temperature side yarn in order to suppress and stabilize the fluctuation in tension during false twisting. The composite processed yarn is uniformly dispersed in the strips and has a uniform yarn form. Since the composite processed yarn having such a uniform yarn form is made into a fabric, the fabric can be made of high quality without occurrence of uneven streaks.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The yarn used for the composite false twist of the present invention is not particularly limited as long as it is a thermoplastic polymer whose internal structure is changed by heating. Examples thereof include polyamide fiber, polyester fiber, polyacryl fiber, and polyvinyl fiber. Examples thereof include alcohol fibers, polyvinyl chloride fibers, polyvinylidene chloride fibers, and polypropylene fibers, and polyamide fibers and polyester fibers are particularly preferable.

[0010] The form of the yarn may be any of drawn yarn, semi-drawn yarn and undrawn yarn. The fineness, the number of filaments, the cross-sectional shape, the dyeing properties, the gloss, the presence or absence of twist, and the like may be arbitrary, and the physical properties such as strong elongation, shrinkage, and Young's modulus may be arbitrary. Also, as a combination of at least two yarns,
The kind, form, shape, physical properties, and the like may be the same or different, and are not particularly limited.

As the false twisting means, any conventionally known means can be used. For example, any of a circumscribed type friction false twist device, a belt nip type false twist device, a spindle type false twist device, and the like can be used, and may be appropriately selected according to a type of a supply yarn or a false twist processing condition. . In the present invention, at least two yarns to be subjected to the composite false twist need to be subjected to a bundling treatment and a heat treatment to at least one of the yarns to provide a bundling property between the single fibers and to be in a high temperature state. is there. The other yarn to be combined with the high-temperature yarn may or may not be subjected to the bunching process and the heat treatment, but may be at least a lower temperature than the heat-treated yarn at the high temperature state. It needs to be in a state.

The feed rate when at least two yarns are subjected to the composite false twisting step may or may not be given a difference between them, but it suppresses high crimpability and high bulkiness. Above it is preferred to have the same feed rate. The heat treatment temperature for the yarn is not particularly limited as long as a temperature difference can be given between the yarn and the other yarn. Preferably, the heat treatment temperature is from the glass transition temperature of the yarn to (the softening temperature of the yarn −20).
° C), and the temperature difference from the other yarn is preferably in the range of 5 ° C to 200 ° C.

If the heat treatment temperature is lower than the glass transition temperature of the yarn, or if the temperature difference is lower than 5 ° C., the heat exchange with the yarn on the low temperature side will not be sufficiently performed, whereby It becomes difficult to exhibit the effect of changing the internal structure due to the heat exchange performed. Further, the heat treatment temperature is higher than (the softening temperature of the yarn -20 ° C),
If the temperature difference is higher than 200 ° C., the processed yarn is liable to be thermally degraded, and the processing becomes unstable.

By subjecting at least the yarn to be subjected to the heat treatment to the bunching treatment, the fluctuation in tension during false twisting can be reduced and stabilized, and the single yarn of the heat-treated yarn can be kept at a low temperature without uneven distribution. It can be uniformly dispersed with respect to the yarn on the side. Then, by uniformly dispersing the single yarn of the high-temperature side yarn, a composite processed yarn having a uniform yarn form can be obtained. The sizing treatment means for imparting sizing properties to the yarn is not particularly limited, but includes, for example, entanglement treatment, twisting treatment, gluing treatment, oil treatment, fusion treatment, and the like. One or a combination may be used. Among them, the entanglement treatment and the twisting treatment are preferred means.

For the convergence process by the entanglement process, an entanglement nozzle configured to inject compressed air from the side surface of the cylindrical yarn passage may be used. The entanglement degree given to the yarn by the entanglement treatment is preferably in the range of 20 to 200. When the degree of confounding is less than 20, the stabilization of the tension and the dispersing action of the single yarn at the time of false twisting as described above are weakened. The effect is also reduced.

Here, the "degree of confounding" is defined in JIS-L101.
3 (1992), using an intangle tester (model: R2040) manufactured by Roschild (Switzerland).

Further, the convergence treatment by the twisting treatment can be given by a twisting machine, and the twisting treatment is preferably performed in advance before being subjected to the false twisting step. The number of twists given by this twisting treatment is in the range of 5 to 200 turns / m, preferably 10 to 200 turns / m. If the number of twists is less than 5 turns / m, the stabilization of tension during false twisting and the effect of dispersing single yarns become weak, and if it is more than 200 turns / m, the effect of false twisting is reduced.

In the case of using a gluing process, an oil solution process or a fusion process as a bunching process, the single yarns should be of such a degree that they are lightly joined to each other. In other words, in the case of sizing, the paste is treated with a paste of low concentration, in the case of oil treatment, the paste is treated with a slightly higher concentration of oil, and in the case of fusion, the paste is treated at a temperature very close to the melting point of the yarn. It is desirable to do so.

FIG. 1 shows an example of a process for producing a composite textured yarn according to the present invention. In FIG. 1, two types of packages, a package 1a around which a yarn A is wound and a package 1b around which a yarn B is wound, are installed on the supply side. Supply rollers 2a, which are arranged close to the respective packages 1a, 1b,
2b and the take-off roller 7 common to the two,
A merging guide 6, a cooling plate 9, and a false twist rotator 7 are arranged, and between the supply roller 2a on the package 1a side and the merging guide 6, an entanglement nozzle 4, a feed roller 3, and a hot plate 5 are provided.
Are arranged. Further, another entanglement nozzle 11 is disposed downstream of the take-up roller 7, and a package 12 for winding the composite yarn through a feed roller 10 is provided.

The supply roller 2a from one package 1a
Before the yarn A drawn out of the package 1 reaches the confluence P with the yarn B drawn out from the other package 1b, the yarn A is entangled by the entanglement nozzle 4 in advance to give convergence. It is heated and becomes hot yarn.
The yarn B pulled out from the other package 1b is sent without being subjected to the entanglement process and the heat treatment, and reaches the junction P as a yarn having a lower temperature than the yarn A. The supply speeds of the two yarns A and B pulled out from the supply rollers 2a and 2b as described above may be the same or different from each other. What is necessary is just to set according to conditions.

The two yarns A and B are joined at a joining point P,
While being taken up by the take-up roller 7, the twisting is performed on the upstream side of the false twisting rotor 8 and untwisted on the downstream side to perform false twisting. When the false twisting is performed in this manner, the yarns A and B twisted on the upstream side of the false twist rotor 8 maintain the twisted state while the yarn B on the low temperature side becomes the yarn on the high temperature side. Article A
, Heat treatment is unevenly performed in the yarn axis direction and the diameter direction. As a result, the internal structure and the fiber shape change within and between the single yarns. A plurality of streaky indentations are formed in the diametrical direction to give a gentle crimp.

When the above-described false twisting is performed, since the yarn A on the high temperature side has been given a bunching property by a confounding process in advance, it acts to stabilize the fluctuation in tension during the false twisting, In addition, the single fibers are uniformly dispersed in the cross section of the composite yarn to make the yarn form uniform. The cooling plate 9 arranged on the upstream side of the false twist rotor 8 cools and fixes the crimped structure formed by the false twist processing, and also controls the yarn path during the false twist processing and prevents vibration. Contributes to stable processing. When the composite processed yarn having such a uniform yarn form is knitted and woven into a fabric, the composite processed yarn becomes a high-quality fabric free from generation of uneven streaks.

The composite textured yarn obtained as described above is
Next, after being entangled by the entanglement nozzle 11 between the take-up roller 7 and the feed roller 10, the entanglement is wound around the package 12.

FIG. 2 shows another example of a process for producing a composite textured yarn according to the present invention. In this embodiment, the yarn A drawn from one package 1a is heated by the hot plate 5a, and the yarn B drawn from the other package 1b is also heated by the hot plate 5b. Is different from However, even when heating both yarns A and B in this way, the heating temperature of the heating plate 5a for the yarn A must always be higher than the heating temperature of the heating plate 5b for the yarn B. No. By providing a temperature difference so that the temperature of the yarn A is higher than that of the yarn B, the same operation and effect as in the case of FIG. 1 can be obtained.

[0025]

【Example】

Example 1 A polyethylene terephthalate polymer was melt-spun at a high speed according to a conventional method to obtain a breaking elongation of 180, respectively.
%, 128-denier, 72-filament, half-drawn polyester yarn A and 200% cut elongation, 290-denier, 30-filament, half-drawn polyester yarn B
And was made.

The polyester yarns A and B are set as yarns A and B in the false twisting step (false twist rotor: circumscribed friction false twisting device) shown in FIG. The supply speed is 205 m / min and the take-off speed is 339 m / min.
The number of false twists was set to 1740 turns / m, the degree of entanglement applied to the yarn A was set to 91, and the heating temperature was set to 150 ° C. to perform composite false twisting to obtain a composite processed yarn.

A yarn obtained by giving a twist of 500 times / m to the above-mentioned composite processed yarn was used for the weft, and 7
Weaving was carried out using a drawn polyester yarn of 5 denier and 36 filaments as a warp to give a woven fabric having a weft density of 64 yarns / inch and a warp density of 73 yarns / inch. The woven fabric was dyed and finished by a conventional method. The woven fabric obtained in this way had a worsted texture that was soft and taut, excellent in waist and rebound, and rich in heat retention. In addition, it was a high-quality woven fabric in which no glitter unique to false twisted yarn was observed and no uneven streaks were observed.

Comparative Example 1 A composite processed yarn was obtained under the same yarns A and B and processing conditions as in Example 1, except that an apparatus without a tangling nozzle was used in the false twisting step of FIG. Next, this composite processed yarn was used as a woven fabric under the same conditions as in Example 1. The fabric obtained in this way is upholstery, waist,
It has a worsted-like feel with excellent repulsion and heat retention, and no glitter specific to false twisted yarn was observed. However, friction with the yarn path guide and the like in the false twisting process (Shikiki) As a result, a portion where the yarns A and B took part in a non-uniform form was observed as a portion which became uneven in the woven fabric, and the quality was inferior to the woven fabric obtained in Example 1.

[0029]

As described above, according to the manufacturing method of the present invention, a thin structure having a nonuniform and short period in the yarn axis direction of the single fiber and a plurality of streaky indentations in the diameter direction of the single fiber are provided. A composite processed yarn having a gentle crimp with the generation of a twist and having no glitter unique to false twisted yarn is obtained, and when this is made into a fabric and subjected to a heat treatment in post-processing such as dyeing, between the single fibers in the fabric, By forming minute voids and deviations, it is possible to obtain a soft wool feel, a waist, and a repellent feel.

In addition, by giving at least the bundle on the high-temperature side yarn in advance, a composite processed yarn having a uniform yarn form can be obtained. A simple cloth can be obtained.

[Brief description of the drawings]

FIG. 1 is a process chart showing an example of a production process of a composite processed yarn according to the present invention.

FIG. 2 is a process chart showing another example of the process for producing a composite textured yarn according to the present invention.

[Explanation of symbols]

 1a, 1b Package 2a, 2b Supply Roller 4 Entangling Nozzle 5, 5a, 5b Hot Plate 6 Merging Guide 7 Take-Up Roller 8 False Twist Rotor

Claims (4)

[Claims] At least two of a high-temperature yarn subjected to a bunching process and a heat treatment, and a yarn having a lower temperature than the yarn.
A method for producing a composite processed yarn in which yarns having different temperature differences are combined and false-twisted, and during the false twisting, the high-temperature yarns heat-treat the low-temperature yarns. 2. The method according to claim 1, wherein the convergence process is a confounding process, a twisting process,
The method for producing a composite textured yarn according to claim 1, wherein the method is at least one of a gluing treatment, an oil treatment, and a fusion treatment. 3. The method according to claim 1, wherein the convergence treatment is a confounding treatment, and the confounding treatment gives a degree of entanglement of 20 to 200. 4. The method according to claim 1, wherein the bundling treatment is a twisting treatment, and the twisting treatment gives a twist of 5 to 200 turns / m.