JPH08170240A - Bulky composite fasciated spun yarn and its production - Google Patents

Abstract

PURPOSE: To provide a bulky composite fasciated spun yarn having good handleability of weaving and knitting process and having both of proper swelling and soft touch feeling and provide a method for producing the spun yarn. CONSTITUTION: In this fasciated spun yarn winding a short fiber round a fiber bundle consisting mainly of a polyester multifilament and a short fiber, the polyester multifilament is composed of a polyester-multifilament A having negative heat shrinkage factor at 160 deg.C dry heat and a polyester multifilament B having >=5.0% heat shrinkage factor at 160 deg.C dry heat. This method for producing bulky composite fasciated spun yarn comprises heat-treating the polyester multifilament A to provide a characteristic having negative heat shrinkage factor at 160 deg.C dry heat, blending or doubling the polyester multifilament A with the polyester multifilament B without once winding, successively superposing the multifilament onto drafted short fiber bundle and introducing the fiber bundle into an air type false twist nozzle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite bulky bound spun yarn in which the quality of a bound spun yarn in which short fibers are wrapped around a fiber bundle and bound is improved, and a method for producing the same.

[0002]

2. Description of the Related Art So-called spun yarn, in which short fibers are wound around a fiber bundle to bind the fiber bundle, is advantageous because it can be obtained at a higher production speed than a conventional spinning method such as a ring spinning method. Although it is a spun yarn, it is necessary to increase the degree of binding in order to obtain a strength that does not cause a problem in the subsequent woven or knitting. However, the bound spun yarn with strong binding does not have bulkiness or flexibility, and the woven or knitted fabric using it does not have a bulge and has a hard texture, which is difficult to use for ordinary clothes.
At present, most of the bound spun yarns are used for applications other than clothes such as bedspreads.

As a method for improving such a drawback of the bound spun yarn, there is known a method in which multifilaments are combined with short fibers to form a composite bound yarn. However, by simply compounding the multifilament yarns, a woven or knitted material is obtained. The texture is not improved, and a method in which a multi-filament is made into a woven or knitted fabric with a shrinkage yarn higher than that of a short fiber, and then a difference in shrinkage is developed to obtain a bulge is not effective. Further, as disclosed in JP-A-3-152219, a method in which a multifilament yarn is made into a fiber which can be easily dissolved and then made into a yarn and then dissolved, surely gives a bulge and becomes soft, but the physical properties of the cloth are It is unrealistic because it gets worse and costs more.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawback of the bound spun yarn, which is not bulged and has a hard texture, and has good handleability in the next step and appropriate bulkiness and flexibility. An object is to provide a bound spun yarn and a method for manufacturing the same.

[0005]

In order to solve the above problems, the present invention relates to a bound spun yarn in which a short fiber is wound around a fiber bundle mainly composed of a polyester multifilament and a short fiber, wherein the polyester multifilament is dry-heated. Polyester multifilament yarn A having a negative heat shrinkage at 160 ° C and a heat shrinkage at dry heat of 160 ° C of 5.0%
It is a composite bulky, spun yarn, characterized by comprising the above polyester multifilament yarn B.

In the composite bulky bundle spun yarn of the present invention, the ratio of polyester multifilament to short fiber is 20:
It is preferably in the range of 80 to 70:30. The ratio of the polyester multifilament yarn A to the polyester multifilament yarn B is preferably in the range of 30:70 to 70:30.

The heat shrinkage rate of the dry heat 160 ° C. of the polyester multifilament yarn A used in the present invention is preferably −4% or less, and the heat shrinkage rate of hot water 75 ° C. is preferably 0% or more. Further, it is more preferable that the heat shrinkage of the polyester multifilament yarn B at a dry heat of 160 ° C. is 15% or more.

Further, as the manufacturing method of the present invention, the invention of claim 7 heat treats the polyester multifilament to dry heat 1
After imparting the characteristic of having a negative heat shrinkage rate of 60 ° C., the polyester multifilament yarn B is mixed or aligned with the polyester multifilament yarn B without being wound once, and then introduced into a draft short fiber bundle and a superposed air false twist nozzle. Is a method for producing a composite bulky bound spun yarn.

The present invention will be described in more detail below. The polyester multifilament shown in the present invention is a polymer having polyethylene terephthalate or polyethylene terephthalate as a main component, and a copolymer of isophthalic acid, 5-sodium sulfonic acid metal salt or the like as a third component, a hydrolysis treatment, etc. It 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 multifilament yarn may be drawn yarn or undrawn yarn.

The short fibers may be any fibers such as polyester fibers and acrylic fibers, but a composite bulky bound spun yarn obtained by using cellulose fibers such as cotton and rayon is more preferable because it has appropriate hygroscopicity. .

As a method for obtaining the composite bulky bundle spun yarn, for example, a multifilament yarn in which a polyester multifilament yarn and a fiber bundle of short fibers are introduced into an air false twisting nozzle and a part of the short fibers becomes a core yarn And a method of winding a fiber bundle of short fibers.

[0012] In order to secure the strength of the bound spun yarn so that good operability can be obtained in the post-process such as woven knitting, it is necessary to increase the winding degree of the short fiber. Becomes harder and the woven or knitted product obtained is only bulge-free. It is possible to combine the multifilaments and use the strength of the multifilaments to lower the winding degree of the short fibers and use the threads without making them hard.However, since the number of short fibers is small, the winding degree must be strong. It is not practical because the focusing property becomes poor and defects such as nep occur. Further, it is possible to give a difference in heat shrinkage to the multifilament and the short fiber, and to expose the difference in heat shrinkage between the two by heat of dyeing and finishing after weaving, and to give bulge, but it is used for general clothing. In the woven and knitted fabrics, especially the woven fabrics, the density of the yarns is mixed, the difference in heat shrinkage hardly appears, and the expected bulged and knitted fabric cannot be obtained.

The present inventor has diligently studied this point, and if the multifilament constituting the core portion is composed of a multifilament yarn that contracts with heat and a multifilament yarn that expands with heat, the composite filament The inventors have found that the swelling of a woven or knitted material is significantly improved by using the bound spun yarn, and the present invention has been completed. For the above reasons, the polyester multifilament of the present invention has a negative heat shrinkage at 160 ° C. dry heat, that is, a polyester multifilament A which is a so-called self-extending yarn and a polyester multifilament having a heat shrinkage at 160 ° C. dry heat of not less than 5,0%. It must be composed of filament B.

More preferably, the heat shrinkage of the polyester multifilament A at a dry heat of 160 ° C. is -4% or less, and the heat shrinkage of the polyester multifilament B at a dry heat of 160 ° C. is 15% or more. It is preferable. Dry heat of polyester multifilament A 160 ℃
If the heat shrinkage of the polyester multifilament B is positive, even if the dry shrinkage of the polyester multifilament B at 160 ° C. is large, the swelling obtained as a woven fabric having a high density is not large, and is -4%
The following is preferable because a larger bulge is obtained. When the heat shrinkage of the polyester multifilament B at a dry heat of 160 ° C. is 15% or more, a particularly large bulge can be obtained in a knitted fabric or a woven fabric having a low density, and an unprecedented product can be obtained.

The composite bulky bundled spun yarn may be subjected to sizing or twisting set when it is used in a woven fabric or a knitted fabric, but the stretchability of the polyester multifilament A is expressed in that process, which may result in poor handleability. Is not preferable. Therefore, it is necessary that the heat shrinkage rate of hot water at 75 ° C. is 0% or more.

The ratio of polyester multifilaments to short fibers is preferably in the range of 20:80 to 70:30.
When the ratio of the polyester multifilament is less than 20%, the effect of bulging in a woven or knitted fabric is low, which is not preferable,
On the other hand, if the ratio exceeds 70%, the entanglement of short fibers is unstable, which is also undesirable. The ratio of polyester multifilament A to polyester multifilament B is 3
It is preferably in the range of 0:70 to 70:30. If the ratio of the polyester multifilament A is less than 30%, the effect of swelling is low, and conversely if it exceeds 70%, a feeling of puffiness is produced and pills are caused, which is not preferable.

As the spinning method, the most common ring spinning method is a method of compounding multifilaments and short fiber bundles,
For example, in the so-called core yarn spinning in which the multifilament is arranged in the core portion, a method of using the self-stretching yarn as in the present invention may be used as the multifilament, but in this method, since the entire yarn is twisted, Even if the woven or knitted fabric using the composite yarn is subjected to the heat treatment in the finishing process, the difference in shrinkage between the self-expanding yarn and the shrinkable yarn cannot be increased, and the swelling of the woven or knitted fabric cannot be obtained as expected. On the other hand, in the composite bulky bundled spun yarn of the present invention, the multifilament is substantially not twisted, and when a woven or knitted fabric using this composite bulky bundled spun yarn is subjected to heat treatment in the finishing process, it self-expands. The yarn is sufficiently stretched by heat and a large yarn length difference from the contracted yarn is developed, and a sufficiently bulged product is obtained, and a fabric having a good texture is obtained.

In the production method of the present invention, for example, as shown in FIG. 1, the polyester multifilament 7 unwound from the pan 6 is heat-treated to give a characteristic that the heat shrinkage rate at dry heat of 160 ° C. is negative, and then the wound. Without mixing, the polyester multi-filament B is mixed or aligned with the polyester multi-filament B, and then the roving 2 unwound from the Shino winding 1 is overlapped with the short fiber bundle drafted between the rollers 3, 4 and 5 and the air false twisting nozzle is stacked. 9 is a method for producing a composite bulky bundled spun yarn. Characteristic of heat shrinkage at 160 ° C of dry heat being negative to the polyester multifilament To impart so-called self-stretching property, it is necessary to remove the characteristic that the yarn tries to shrink, so the polyester multifilament should be heated at an appropriate temperature and time. The yarn needs to be processed. By adopting the method of the present invention, the heat treatment and the binding spinning of the polyester multifilament can be continuously carried out, so that the process can be omitted and the rationalization can be made considerably. In addition,
Reference numeral 17 is cheese, 10 and 18 are guides, 11 is a take-up roller, 12 is a take-up roller, and 13 is a composite bulky spun yarn.

Since the polyester multifilament having self-stretching property is not crystallized, the characteristics of the yarn are liable to change when left for a long time, which causes quality variation. The problem is greatly improved when the self-stretching property is imparted to the multifilament and immediately used in the composite binding spinning. Further, since the polyester multifilament can be used for binding spinning with almost no twisting because it is not wound up once, it is also an excellent feature of the present invention that a large bulge can be imparted to a woven or knitted fabric.

Next, a method for measuring the heat shrinkage rate at 160 ° C. dry heat and the heat shrinkage rate at 75 ° C. hot water shown in the present invention will be described. (1) Heat shrinkage rate of dry heat 160 ° C A lap reel having a circumference of 1 m takes an initial load of 1/30 (g / denier) and takes a skein eight times, and a load of 1/60 (g / denier) is applied to the skein, The length L ₀ (mm) is measured.
Then, after applying a load of 1/4000 (g / denier) for 10 minutes at a dry heat of 160 ° C., a load of 1/60 (g / denier) is applied again and the length L ₁
(Mm) is measured, and the heat shrinkage at a dry heat of 160 ° C. is calculated by the following formula. Heat shrinkage (%) at dry heat of 160 ° C. = [(L ₀ −L ₁ ) / L
₀ ] × 100 (2) Heat shrinkage rate of hot water at 75 ° C Take a lap reel with a circumference of 1m for an initial load of 1/30 (g / denier) and take a skein eight times to load a skein of 1/60 (g / denier) And measure its length L ₀ (mm).
Then, the load is removed, and the cassette is immersed in hot water at 75 ° C. for 30 minutes while being applied with 1/4000 (g / denier). After that, the case is taken out of warm water, thoroughly wiped off with water, and sufficiently dried, and then a load of 1/60 (g / denier) is applied to the case, and its length L ₂ (mm) is measured. Thermal shrinkage (%) of hot water at 75 ° C. = [(L ₀ −L ₂ ) /
L ₀ ] × 100

[0021]

【Example】

Example 1 A composite bulky bound spun yarn was manufactured under the following conditions using the composite bulky bound spun yarn manufacturing apparatus shown in FIG. Short fiber: Polynosic fiber (1.0 denier, fiber length 38 mm (equal length), heat shrinkage rate at dry heat 160 ° C is 0.4%) Spinning speed: 30th (English cotton count) Take-up roller speed: 185 m / min As the polyester multifilament A, a 30 denier 18-filament yarn wound up without drawing a heat treatment after drawing an undrawn yarn of 3200 m / min for spinning is used as a supply yarn 7, and a heater 8 and a feed roller are used. 15
And 16 are set appropriately to set the heat shrinkage rate at dry heat of 160 ° C. to −5.
What was made 3% was used. As the polyester multi-filament B, the same undrawn yarn as the polyester multi-filament A was drawn and then heat-treated to obtain a yarn having 30 denier and 18 filaments and having a heat shrinkage rate of 13.8% at a dry heat of 160 ° C. The obtained composite bulky bundled spun yarn was used as a warp and a weft of a twill structure to make a woven fabric, which was dyed and finished to have a warp density of 101 yarns / inch and a weft yarn density of 84 yarns / inch. When the quality of the finished woven fabric was evaluated, it could be confirmed that the woven fabric had a good swelling and a texture not found in the conventional spun yarn.

Example 2 Using the same apparatus as in Example 1, the polyester multifilament B has a heat shrinkage ratio of 38.8% at a dry heat of 160 ° C.
The same polyester multifilament A and short fibers under the same conditions as in Example 1 were used except that the above-mentioned one was used.
The obtained composite bulky bundled spun yarn was knitted by an 18-gauge double-sided knitting machine and dyed and finished. The obtained knitted fabric had good swelling and uniform fabric surface that were not found in the conventional knitted spun yarn.

COMPARATIVE EXAMPLE 1 Using the same apparatus as in Example 1, using as the polyester multifilament A, 30 denier 18 filaments, which were wound up without drawing a heat treatment after drawing an undrawn yarn having a spinning take-up speed of 3200 m / min, were prepared. The heater 8 and the feed rollers 15 and 16 were appropriately set so that the heat shrinkage at a dry heat of 160 ° C. was 6.5%. As the polyester multifilament B, a 30-denier 18-filament yarn obtained by winding the same undrawn yarn as that of the polyester multifilament A without drawing and then heat-treating it and having a heat shrinkage ratio of 33.8% at a dry heat of 160 ° C. was used. . The obtained composite bulky bundled spun yarn was made into a woven fabric of the same standard as in Example 1 and subjected to the same dyeing finishing processing to finish the warp density to 103 yarns / inch and the weft yarn density to 86 yarns / inch. When the quality of the finished woven fabric was evaluated, it was harder than the woven fabric of Example 1 and inferior in bulge.

[0024]

EFFECTS OF THE INVENTION The composite bulky bound spun yarn of the present invention has both a polyester multifilament which is stretched by heat and a polyester multifilament which is contracted by heat in a dyeing finishing process after forming a fabric into a fiber bundle having substantially no twist. As a result, a woven or knitted fabric having a good bulge and a soft touch, which can be sufficiently used for general clothing, is obtained. Further, since the production method of the present invention continuously performs the step of imparting the self-stretching property to the polyester multifilament and the step of the composite binding spinning, the composite bulky binding spun yarn of good quality can be obtained at low cost. This is an epoch-making method.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Shinonaki 5 Front Roller 6 Pane 8 Heater 9 Pneumatic False Twisting Nozzle 14 Winding Cheese 17 Cheese

Claims (7)

[Claims] 1. A bound spun yarn in which a short fiber is wound around a fiber bundle mainly composed of a polyester multifilament and a short fiber, wherein the polyester multifilament has a negative heat shrinkage at a dry heat of 160 ° C. (A). ) And the heat shrinkage ratio of dry heat 160 ° C is 5.0
% Of the polyester multifilament (B), which is a composite bulky spun yarn. 2. A composite bulky, spun yarn, wherein the polyester multifilament (A) according to claim 1 has a heat shrinkage ratio of 75% in hot water of 0% or more. 3. A composite bulky, spun yarn, wherein the polyester multifilament (A) according to claim 1 has a heat shrinkage at dry heat of 160 ° C. of -4% or less. 4. A composite bulky bundle spun yarn, wherein the ratio of the polyester multifilament to the short fiber of claim 1 is in the range of 20:80 to 70:30. 5. A composite bulky bundled spun yarn, wherein the ratio of the polyester multifilament (A) to the polyester multifilament (B) is in the range of 30:70 to 70:30. 6. A composite bulky bound spun yarn, wherein the polyester multifilament (B) according to claim 1 has a heat shrinkage ratio of 15.0% or more at a dry heat of 160 ° C. 7. A polyester multifilament (B) is mixed and aligned with the polyester multifilament (B) without being wound once after being heat-treated to impart a characteristic of having a negative heat shrinkage at a dry heat of 160 ° C., and then drafted. A method for producing a composite bulky bundled spun yarn, which comprises introducing the bundled short fiber bundle and an overlapping air type false twist nozzle.