JPH11222741A - Bundled composite spun yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a bundled composite spun yarn with such structure that a fiber bundle composed of a thermoplastic continuous synthetic fiber false-twist textured yarn and short fibers are entwined with a part of the short fibers, satisfying specific conditions, having moderate puffiness, good handleability for the succeeding process and soft touch feel. SOLUTION: This bounded composite spun yarn has such structure that a fiber bundle composed of (A) a thermoplastic continuous synthetic fiber false- twist textured yarn pref. consisting of polyester and having unevennesses in the direction of fiber axis and (B) short fibers pref. differing in dyeability from the yarn A, is entwined with a part of the short fibers B, and satisfies the following relationships: CC(A)(%)>=20.0, and DT(A) (g/d)>=3.0 [CC(A) is the crimp manifestation rate of the yarn A; DT(A) is the breaking tenacity of the yarn A].

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in quality of a bundled spun yarn in which short fibers are wound around a fiber bundle and bound.

[0002]

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

[0003] As a method of improving such a drawback of the bunched spun yarn, a method of combining a conjugated long fiber yarn with a short fiber to form a conjugated composite yarn is known. The texture of a knitted fabric cannot be improved by itself.

[0004]

SUMMARY OF THE INVENTION The present invention improves the above-mentioned drawbacks of the conventional tied spun yarn, that is, it has no swelling and hard texture, and has good handleability in the next step and has swelling. It is an object of the present invention to provide a tied composite spun yarn having a soft texture.

[0005]

Means for solving the above-mentioned problems, that is, the present invention relates to a fiber bundle composed of a thermoplastic synthetic fiber long fiber false twisted yarn (A) and a short fiber (B). A conjugated spun yarn in which a part of the short fiber (B) is wound, wherein the conjugated spun yarn satisfies the following formulas (1) and (2): CC (A) [%] ≧ 20. 0 …………………………………………………………………………………………………… (1) DT (A) [g / d] ≧ 3.0 (A) shows the crimping rate of the thermoplastic synthetic fiber long fiber false twisted yarn A, and DT (A) shows the breaking strength of the thermoplastic synthetic fiber long fiber false twisted yarn (A). 2. The thermoplastic synthetic long-fiber false twisted yarn (A) has large and thin spots in the fiber axis direction.
The conjugated composite spun yarn, thermoplastic synthetic fiber long fiber false twisted yarn (A) according to claim 1 or 2, wherein the conjugated composite spun yarn and thermoplastic synthetic fiber long fiber false twisted yarn (A) are made of polyester.
The bound composite spun yarn according to any one of claims 1 to 3, wherein the single fiber (B) has a different dyeability.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The conjugated composite spun yarn of the present invention is a conjugated spun yarn in which a part of the short fiber (B) is wound around a fiber bundle composed of a thermoplastic synthetic long fiber false twisted yarn (A) and a short fiber (B). is there.
The thermoplastic synthetic filaments referred to in the present invention are thermoplastic multifilaments having a fiber-forming ability, and specifically include polyester multifilaments, polyamide multifilaments and the like. It is necessary that these thermoplastic synthetic filaments have been subjected to false twisting. The thermoplastic synthetic fiber long twisted yarn (A) is necessary for giving the bound spun yarn a swelling feeling, and is necessary for compensating for the point that the bound spun yarn tends to have insufficient strength. The thermoplastic synthetic fiber long twisted yarn (A) has a CC [%] determined by the measurement method described below.
(Crimp expression rate) needs to be 20.0 [%] or more. This is due to the fact that the thermoplastic synthetic fiber long-twisted yarn (A) present in the conjugated composite spun yarn has bulkiness due to false twist crimping, thereby increasing the voids inside the conjugated composite spun yarn and increasing the swelling feeling. In order to give. CC [%] is 2
If it is less than 0.0 [%], the effect of false twist crimping is small, and the effect of giving a swelling feeling to the conjugated composite spun yarn is reduced.
Excluded from the present invention. More preferably, it is 30.0 [%] or more.

[0007] It is necessary that the breaking strength of the thermoplastic synthetic fiber long twisted yarn is not less than 3.0 [g / d].
When it is less than 3.0 [g / d], the effect of compensating for the insufficient strength of the tied spun yarn is small, and is excluded from the present invention. More preferably, it is 3.5 [g / d] or more.

[0008] It is also preferable that the thermoplastic synthetic fiber long-twisted yarn has thick and thin spots in the fiber axis direction. In addition, the difference between the heat shrinkage characteristics of the thick part and the small part becomes apparent by the heat treatment at the time of dyeing, and has the effect of improving the bulkiness. Also, when the thermoplastic synthetic fiber long-twisted yarn is made of polyester, the high elasticity of the polyester fiber gives the bound composite spun yarn woven or knitted fabric a firmness, which is preferable.

It is also preferred that the thermoplastic synthetic fiber long-twisted yarn has a different dyeability from the short fibers. Since the thermoplastic synthetic fiber long-twisted yarn has a different dyeability from the short fiber, a marbling appearance effect can be imparted to the united composite spun yarn. As a preferred combination of the thermoplastic synthetic fiber long-twisted yarn and the short fiber, the thermoplastic synthetic long fiber false-twisted yarn is polyester, and the short fiber is made of cotton, wool, regenerated cellulose fiber, or the like. In the case where the synthetic fiber long twisted yarn is a cationic dye dyeable polyester and the short fiber is a regular polyester mainly composed of ordinary polyethylene terephthalate, the reverse combination or the like can be shown.

Any single fiber denier of the thermoplastic synthetic fiber long-twisted yarn can be applied, but a relatively large one is preferable in order to give a moderate tension to the bound composite spun yarn woven or knitted fabric. , 1.5 to 10.0 denier. Regarding the cross section of the filament, any one of polygonal, multi-lobed, hollow, flat, and other specially shaped cross sections may be used as the supply yarn for false twisting, in addition to the usual round cross section.
Further, different types of single fiber denier and cross section may be mixed. On the other hand, for short fibers, when it is a synthetic fiber, various single fiber denier,
The cross section can be manufactured, and is applicable to the conjugated composite spun yarn of the present invention, like the thermoplastic synthetic long fiber false twisted yarn.

The method for producing the conjugated composite spun yarn of the present invention is not particularly limited, but an example thereof will be described. The thermoplastic synthetic fiber long fiber false twisted yarn is obtained by false twisting a thermoplastic synthetic fiber long fiber (multifilament such as polyester and polyamide). The supply yarn for the false twisting may be a drawn yarn or a highly oriented undrawn yarn having a high spinning speed. At the time of false twisting, the feed rate can be adjusted according to the elastic modulus of the supply yarn to perform processing. Considering the bulkiness, the number of false twists is preferably relatively large. The denier of the thermoplastic synthetic fiber long fiber false twisted yarn is D, and the number of false twists is T [T
/ M], T√D is preferably about 20,000 to 36,000. The heat setting heater temperature is preferably relatively high for the same reason, and is preferably about 160 to 230 ° C.
In this way, CC [%] (crimp expression rate) is reduced to 20 [%].
As described above, DT [g / d] (breaking strength) was 3.0 [g / d].
Adjust above.

[0012] The thermoplastic synthetic long fiber false twisted yarn obtained as described above and the short fiber sliver are bound and conjugate spun. Bundling spinning device with short fiber draft part and bundling spinning part (for example, MJS type binding spinning device manufactured by Murata Machinery)
, And after drafting the short fiber sliver (preferably a drawn sliver), it is bound and spun with two serially arranged swirling jets or twisted bodies that give false twists in opposite directions. The thermoplastic synthetic fiber long twisted yarn is supplied to a front roller located at the most downstream side of the draft part, is combined with the drafted short fiber bundle, and is guided together with the swirling jet.
The spun yarn is a bound composite spun yarn in which a thermoplastic synthetic long fiber false twisted yarn and a part of short fibers are used as a core, and short fibers are wound around the outer periphery.

Next, the measuring method used in the evaluation of the present invention will be described. (DT (breaking strength) [g / d]) JIS L-1013
According to (1981), a sample length of 200 [mm] and a tensile speed of 200 using Tensilon manufactured by Toyo Baldwin Co., Ltd.
An SS curve was drawn at [mm / min], and the breaking strength was calculated. (CC (Crimp expression rate) [%]) Eight turns of a sample are formed on a wrap reel having an appropriate frame circumference under a load of 1/10 [g / denier]. Immerse in boiling water for 5 minutes with no load. The sample is taken out of the boiling water, and while in a wet state, a load of 2/10 [g / denier] is applied thereto, and the length L1 [cm] of the scab after 1 minute is measured. Next, the load is removed, lightly drained, and then dried in an oven at 60 ° C. for 30 minutes. Remove the scalpel from the oven, 1
After allowing to cool for a time, a load of 2/1000 [g / denier] is applied, and the length L2 [cm] after 1 minute is measured. The crimp expression rate is calculated as follows. Crimp rate [%] = {(L1-L2) / L1} × 100

Hereinafter, a specific embodiment will be described.

EXAMPLES Example 1 Polyethylene terephthalate was melt spun and 80 [denier] / 24 [filament]
To obtain a highly oriented undrawn multifilament yarn composed of filaments having a round cross section. The highly oriented undrawn multifilament yarn is simultaneously drawn and false-twisted, and 50 [denier] /
24 [filament] false twisted yarn was obtained. The false twisted yarn had a CC of 52.0% and a DT of 4.65 g / denier. The false twisted yarn and a 200 [gelen / 6 yard] polyethylene terephthalate drawing sliver (single fiber denier 1.4 [denier], round cross section, fiber length 3
8 [mm] was supplied to Murata Machinery's MJS type binding spinning apparatus, and the draft sliver was drafted and then conjugated and spun to obtain a conjugated composite spun yarn of 30th in English cotton count. The bundled composite spun yarn is twisted at 400 [T / m], and a plain fabric is woven by using the process. And the like to obtain a dyed woven fabric. The dyed woven fabric was soft and had a feeling of swelling, and was preferably a material having an appropriate tension.

(Comparative Example 1) A bundled spun yarn of No. 30 was obtained by using only the drawing sliver without using the synthetic fiber. However, since the spun yarn was weak, the yarn breakage was large, and the loom was frequently stopped in the weaving process. A dyed woven fabric was obtained in the same manner as in Example 1, but the swelling and tightness were poor, which was not preferable.

Comparative Example 2 A false twisted yarn having a CC of 14.5 [%] was used in place of the false twisted yarn used in Example 1, and a conjugated composite spun yarn was obtained in the same manner as in Example 1. Thus, a dyed woven fabric was obtained. Although the dyed woven fabric had a moderate tension, it was not satisfactory in softness and swelling.

Comparative Example 3 A bound composite spun yarn was obtained by using a copolymerized polyester false twisted yarn having a DT of 1.5 [g / denier] instead of the false twisted yarn used in Example 1. .
The loom was stopped many times during weaving, and a high-quality woven fabric could not be obtained.

(Example 2) Instead of the false twisted yarn used in Example 1, a polyethylene terephthalate thick and thin multifilament having a thick and thin spot in the fiber axis direction subjected to false twisting is used. Was. CC is 45.6
[%] And DT were 3.5 [g / denier]. The passability of the weaving process was good, and the dyed woven fabric had a natural marbled appearance, was soft, swelling, and had a moderate tension.

(Embodiment 3) In contrast to Embodiment 2, the drawing sliver was changed to polynosic. A dyed fabric was obtained in the same manner as in Example 2 except that the dyeing formulation was changed to the extent that polynosic was included. The dyed woven fabric had softness and swelling, and had a moderately taut, yet further improved marbling appearance compared to Example 2.

[0020]

The bundled composite spun yarn of the present invention comprises a thermoplastic synthetic filament long-fiber false twisted yarn having a specific crimp development rate and breaking strength and a single fiber. A new yarn that has been improved as a yarn with insufficient swelling, a hard texture, difficult to use for clothing, and a lack of strength that makes it difficult to handle in the post-process. Things.

Claims (4)

[Claims] 1. A bundled spun yarn in which a part of the short fiber (B) is wound around a fiber bundle composed of a thermoplastic synthetic fiber long twisted yarn (A) and a short fiber (B), The following formula (1),
A conjugated composite spun yarn satisfying (2). CC (A) [%] ≧ 20.0 …………… (1) DT (A) [g / d] ≧ 3.0 ……………………. ……… (2) where CC (A) is the rate of crimping of the thermoplastic synthetic-filament long-fiber false twisted yarn A, and DT (A) is the breaking strength of the thermoplastic synthetic-filament long-fiber false twisted yarn (A) Is shown. 2. The united composite spun yarn according to claim 1, wherein the thermoplastic synthetic fiber long yarn false twisted yarn (A) has thick and thin spots in the fiber axis direction. 3. The conjugated composite spun yarn according to claim 1, wherein the thermoplastic synthetic long fiber false twisted yarn (A) is made of polyester. 4. The conjugated composite spun yarn according to claim 1, wherein the thermoplastic synthetic long fiber false twisted yarn (A) and the single fiber (B) have different dyeing properties.