JPH10110342A - Production of complex bundle spun yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a complex bundle spun yarn capable of providing a good processability at the next process, having bulking and soft feeling, and also useful as a high class fashion material by using two or more kinds of polyester multifilaments having different heat shrinkages and short fibers. SOLUTION: A group of two or more kinds of polyester multifilaments having about 5-60% difference between the maximum and the minimum of heat shrinkage at 160 deg.C in dry heat is unwound as filament threads 7 and charged to a front roller 5 with a roving 2 unwound from a bobbin 1 of the roving, in a drawing state. The objective complex bundle spun yarn 13 comprising the filament threads and short fibers and coiled around by a part of the short fibers is drawn through a false-twisting nozzle 9 from a drawn roller 11 and wound on a package 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving the quality of a conjugate spun yarn in which short fibers are wound around a fiber bundle and tied.

[0002]

2. Description of the Related Art A so-called bundled spun yarn in which short fibers are wound around a fiber bundle to bind the fiber bundle has a higher production speed than a conventional spinning method, a ring-type spinning method, and is a powerful spinning method. Although it is a method, it is necessary to increase the degree of binding in order to obtain a strength that does not cause a problem in the next weaving and knitting process. However, the tightly tied spun yarn has no bulkiness or flexibility, and the woven or knitted fabric using it is hard to use in ordinary clothes because it has no swelling and a hard texture. At present, it is used only for other purposes.

[0003] As a method of improving such a drawback of the binding spinning, a method of combining a multifilament yarn with a short fiber to form a composite binding yarn is known. The texture cannot be improved. Furthermore, a method of dissolving multifilament yarn into fibers that can be easily dissolved and then dissolving the yarn as described in Japanese Patent Application Laid-Open No. 3-152219 will surely give rise to swelling and softness. It is not realistic because it becomes worse and costs increase.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional bundled spun yarn, that is, the drawback that there is no swelling and the hand becomes hard, and the handleability in the next step is good and the swelling is soft. It is an object of the present invention to provide a method for producing a composite united spun yarn.

[0005]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems is directed to a method for producing a conjugated spun yarn in which a part of the short fiber is wound around a fiber bundle composed of a polyester multifilament yarn and a short fiber. And a method of producing a composite united spun yarn comprising using, as the polyester multifilament yarn, two or more polyester multifilament groups having different heat shrinkage rates at a dry heat of 160 ° C.

[0006] The polyester multifilament yarn used in the present invention is composed of two or more polyester multifilaments having different heat shrinkage rates at 160 ° C dry heat. Shrinkage difference is 5
% To 60%, and the short fibers are preferably made of cellulose fibers, and the ratio of the polyester multifilament yarn to the short fibers is preferably in the range of 20:80 to 70:30.

In the present invention, the difference between the heat shrinkage of the polyester multifilament group exhibiting the minimum heat shrinkage at 160 ° C. and the heat shrinkage at 160 ° C. of the short fibers is within 8%. Indicates that the polyester multifilament group exhibiting the minimum heat shrinkage at a dry heat of 160 ° C. has a single yarn fineness of 4.5
It is preferably in the range of not less than denier or not more than 0.8 denier.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The polyester multifilament yarn according to the present invention is mainly composed of polyethylene terephthalate or ethylene terephthalate, and a third component is copolymerized with isophthalic acid, metal salt of 5-sodium sulfonic acid, etc. Is a multifilament yarn obtained by spinning from a polymer added with an inorganic or organic substance capable of forming fine grooves and pores.

The short fibers may be any fibers such as polyester fibers and acrylic fibers, but the use of cellulose fibers such as cotton and rayon is more preferable because the obtained composite conjugated spun yarn has an appropriate hygroscopicity.

A conjugated spun yarn in which a part of the short fiber is wound around a fiber bundle composed of the polyester multifilament yarn and the short fiber is, for example, a fiber bundle of the polyester multifilament yarn and the short fiber is pneumatically twisted by a nozzle. And a short fiber is wound around a multifilament yarn in which a part of the short fiber has become a core yarn and a short fiber bundle.

In order to obtain a sufficient strength in the woven or knitting process, it is necessary to increase the degree of wrapping of short fibers, and the bound spun yarn is woven and knitted using the thus obtained bound spun yarn. The product was hard and uncomfortable with no swelling. As a measure for improving this point, the present inventor has found a method of arranging two or more polyester multifilament groups having different heat shrinkage rates at a dry heat of 160 ° C. on the core portion of the bundled spun yarn. The fabric woven or knitted using the composite tied spun yarn of the present invention is subjected to high heat during dyeing, whereby the filaments of the polyester multifilament group exhibiting a high shrinkage rate shrink, and the filaments exhibiting a low shrinkage rate are subjected to composite spinning. The structure protrudes from the surface of the yarn, resulting in a large swelling that is not available in a fabric woven and knitted with a conventional bound spun yarn.

In the ring spinning method, which is a conventional spinning method, the present invention is characterized in that two or more polyester multifilament groups having different heat shrinkage rates at 160 ° C. dry heat are disposed on a core yarn and short fibers are disposed on a sheath portion. A composite spun yarn with a similar structure is also conceivable, but in such a composite spun yarn by ring spinning, the heat shrinkage difference between the multifilaments is manifested even with high heat of the dyeing process due to the twist structure in the entire yarn. Things are difficult. The tied spun yarn is composed of a tied part in which a part of the short fiber is wound around the fiber bundle, and a aligned part in which the fiber bundle has no twist. In the case of the composite tied spun yarn of the present invention, two or more polyester multifilament groups having different heat shrinkage rates of 160 ° C. in dry heat disposed in the core receive high heat of dyeing processing, and thus mainly the tied spun yarn. A difference in heat shrinkage becomes apparent at the aligned portion, and a large swelling can be given to a fabric using the composite spun yarn. Therefore, it is necessary to set the ratio of the tied portion and the aligned portion to an appropriate range in the composite conjugated spun yarn of the present invention, and preferably, the ratio of the aligned portion is 30% to
A range of 65% is good.

[0013] The low shrinkage multifilament is formed on the surface of the fabric woven and knitted with the composite bundled spun yarn together with the short fibers due to the difference in heat shrinkage that has become apparent in the aligned portion, and the tactile sensation of the fabric is obtained. It will have a big impact. When the single yarn fineness of the polyester multifilament group exhibiting the minimum heat shrinkage at 160 ° C. of dryness is 4.5 denier or more, the fabric woven and knitted and dyed and finished using the composite united spun yarn of the present invention is When the single yarn fineness is 0.8 denier or less, a moist touch is obtained, which is preferable.

In the present invention, it is preferable that the difference in heat shrinkage at 160 ° C. between the largest and the smallest of the polyester multifilaments used is in the range of 5% to 60%. If the difference in the heat shrinkage at a dry heat of 160 ° C. is less than 5%, the desired swelling cannot be obtained, and if it exceeds 60%, the problem of the pilling defect occurs in the fabric. More preferably, it is 12% to 25%. The weight% ratio between the polyester multifilament yarn and the short fiber is 20:80 to 70: 3.
It is preferably in the range of 0. If the proportion of the polyester multifilament yarn is less than 20%, the desired swelling and tactile sensation of the fabric cannot be obtained, and if it exceeds 70%, the collectiveness of the yarn deteriorates and short fibers often fall off. The heat shrinkage at 160 ° C of dry heat of the polyester multifilament group showing the largest heat shrinkage is preferably in the range of 10 to 70%, and the heat shrinkage at 160 ° C of dry heat of the polyester multifilament group showing the smallest heat shrinkage. Is 0-20
% Is preferred.

A feature of the present invention is that, as described above, short fibers and low-shrinkage polyester multifilaments are dyed and finished in the aligned portion of the composite tied spun yarn and then woven and knitted with the composite tied spun yarn. Where the structure emerges from the surface. Therefore, the difference between the heat shrinkage of the polyester multifilament group showing the minimum heat shrinkage at 160 ° C. and the heat shrinkage at 160 ° C. of the short fiber used in the present invention is 8%.
It is preferable that it is within. Within this range, the short fibers and the low-shrinkage polyester multifilament are present in substantially the same layer, and when touching the fabric, the characteristics of both the short fibers and the polyester multifilament can be simultaneously felt as a tactile sensation. It is a woven or knitted fabric that was not found in conventional products. In order to make the most of such a yarn structure, it is preferable to use short fibers having characteristics different from those of the polyester multifilament, and from such a point, it is possible to regenerate natural fibers such as cellulose fibers or polynosic fibers having hygroscopicity. Fiber is optimal.

Next, the method of measuring the heat shrinkage at 160 ° C. of dry heat shown in the present invention will be described. A lap reel with a circumference of 1 m is used to take eight knives with an initial load of 1/30 (g / denier), apply a load of 1/60 (g / denier) to the knives, and measure the length L ₀ (mm). . Then 1/4000 (g
/ Denier) with a load of 160 ° C. for 10 minutes, and then apply a load of 1/60 (g / denier) again to measure its length L ₁ (mm). The heat shrinkage at a dry heat of 160 ° C. is calculated by the following equation. Heat shrinkage at dry heat of 160 ° C. (%) = (L ₀ −L ₁ ) × 10
0 / L ₀

Here, the manufacturing method will be briefly described.
In FIG. 1, the roving yarn 2 unwound from the Shino winding 1 passes through a back roller 3, a second roller 4, and a front roller 5, receives a predetermined draft with the back roller 3 to the front roller 5, and receives a pneumatic false twist nozzle 9 Supplied to At this time, the polyester multifilament yarn 7 is unwound from the pan 6 and supplied to the front roller 5 together with the roving being drafted through the guide 8 and the front roller 15, and the false twist nozzle 9 performs a false twisting action. Then, the composite yarn is drawn out from the drawing-out roller 11 as a composite bundled spun yarn 13, and is wound around the winding package 14 by the roller 12. Reference numeral 10 denotes an aggregate of polyester multifilament yarns and short fibers.

[0018]

【Example】

Example 1 A composite united spun yarn was manufactured using the composite united spun yarn manufacturing apparatus shown in FIG. 1 under the following conditions. Polyester multifilament yarn 7:30 denier / 5 filaments (heat shrinkage at dry heat 160 ° C. 5.5)
%) 30 denier / 18 filaments (heat shrinkage rate of 20.3% at dry heat of 160 ° C.) Short fiber constituting roving 2: polynosic fiber (1.0 denier, fiber length of 38 mm, heat shrinkage at dry heat of 160 ° C.) 0.4
%) Tension to the multifilament yarn: 0.1 g / d Spinning count: 30th (English cotton count) Speed of the draw-out roller 11: 185 m / min Using the obtained composite united spun yarn, a warp yarn and Made into a woven fabric using the weft, dyed and finished to a warp density of 98
The number of yarns / inch and the weft density were 82 yarns / inch. When the quality of the finished fabric was evaluated, there was a good bulge that was not found in the conventional bundled spun yarn. An unprecedented product with a complex feeling was obtained.

Example 2 Using the same apparatus as in Example 1, a composite tie spun yarn was produced under the same conditions as in Example 1 except that the following was used as the polyester multifilament yarn. Polyester multifilament yarn 7:45 denier / 216 filament (heat shrinkage at 160 ° C. dry heat)
8%) 30 denier / 5 filaments (heat shrinkage at dry heat of 160 ° C .: 21.5%) The obtained composite tie spun yarn was knitted by an 18 gauge double-sided knitting machine and dyed and finished. The resulting knitted fabric has a bulge that is not found in conventional knitted spun yarn knitted fabrics and the effect of fine single yarn fineness of polyester multifilament low shrinkage yarn. An unprecedented product having an appropriate knitted fabric tension due to the effect of thick single yarn fineness of the yarn was obtained.

Comparative Example 1 Using the same apparatus as in Example 1, a composite tie spun yarn was produced under the same conditions as in Example 1 except that the following was used as the polyester multifilament yarn. Polyester multifilament yarn: 60 denier /
36 filaments (heat shrinkage 10.2 at 160 ° C dry heat)
%) The obtained composite tied spun yarn was made into a woven fabric of the same standard as in Example 1 and subjected to the same dyeing finish processing to finish the warp density to 97 yarns / inch and the weft density to 80 yarns / inch. When the quality of the finished fabric was evaluated, it was harder than the fabric of Example 1 and inferior in bulge.

[0021]

According to the present invention, the conjugated spun yarn obtained by the method of the present invention is made of a fabric in which short fibers and low-shrinkage polyester multifilaments are woven and knitted in the aligned portion by the heat of the dyeing finishing after forming the fabric. The structure that emerges on the surface gives the fabric a large swelling and a soft touch that has never been seen before, so that it can be used as a high-grade fashion material and has excellent handleability.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an apparatus used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shinomaki 5 Front roller 7 Polyester multifilament yarn 9 Pneumatic false twist nozzle 14 Winding cheese

Claims (7)

[Claims] 1. A method for producing a bundled spun yarn in which a part of a short fiber is wound around a fiber bundle composed of a polyester multifilament yarn and a short fiber, wherein the polyester multifilament yarn is subjected to heat shrinkage at a dry heat of 160 ° C. A method for producing a composite united spun yarn, comprising using two or more polyester multifilament groups having different rates. 2. A polyester multifilament group exhibiting a maximum heat shrinkage of 160 ° C. and a minimum dry heat of 160 ° C.
2. The production of the composite conjugate spun yarn according to claim 1, wherein a polyester multifilament yarn having a heat shrinkage difference at a dry heat of 160 [deg.] C. in a range of 5% to 60% from a polyester multifilament group showing a heat shrinkage of 5% is used. Law. 3. The method according to claim 1, wherein the short fibers are cellulose fibers. 4. The method for producing a composite bulky tied spun yarn according to claim 1, wherein the weight% ratio of the polyester multifilament yarn and the short fiber is in the range of 20:80 to 70:30. . 5. The difference between the heat shrinkage of the polyester multifilament group exhibiting the minimum heat shrinkage at 160 ° C. and the heat shrinkage at 160 ° C. of short fibers within a minimum of 8%. 5. The method for producing a composite united spun yarn according to any one of the above items 4. 6. The composite united spun yarn according to any one of claims 1 to 5, wherein the single yarn fineness of the polyester multifilament group exhibiting the minimum heat shrinkage at 160 ° C. is 4.5 denier or more. Manufacturing method. 7. The composite united spun yarn according to any one of claims 1 to 6, wherein the single yarn fineness of the polyester multifilament group exhibiting the minimum heat shrinkage at a dry heat of 160 ° C. is 0.8 denier or less. Manufacturing method.