JP2000328376A - Stretchable composite false-twist textured yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a spun-like composite false-twist textured yarn excellent in extension recovery and also exhibiting high stretch performance while standing the force of constraint as a result after subjected to medium to high twists. SOLUTION: This composite false-twist textured yarn is obtained by arranging in parallel two kinds of filament yarns differing in elongation from each other with the lower-elongation filament yarn being polytrimethylene terephthalate one followed by intermingling them together and then subjecting them thus intermingled to false-twist texturing; wherein the lower-elongation filament yarn is situated as a core and the higher-elongation filament yarn situated coveringly as a sheath therearound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite false twisted yarn, and more particularly to a novel spun-like yarn having a stretch property.

[0002]

2. Description of the Related Art Conventionally, composite false twisted yarns are mainly used as spunlike yarns. The composite false twisted yarn is generally manufactured by a method of performing a false twisting process after two types of filament yarns having different elongations are aligned and entangled. That is, when filament yarns having different elongations are aligned and false-twisted, the filament yarn having a low elongation is positioned at the core, and the filament yarn having a high elongation is wound around the core in a state where the filament yarn is stretched from the core yarn. Spun-like yarn having a core-sheath two-layer structure is manufactured (see Japanese Patent Publication No. 59-39526 and Japanese Patent Publication No. 61-19733).

However, in the core-sheath double-layered processed yarn obtained by such a method, since the sheath yarn is generally wound around the core yarn in an alternately twisted yarn, an ordinary temporary yarn is formed by the twisted yarn structure. Although it has the feature of improving the feeling of feeling and the rubber state, which are the drawbacks of twisted yarn fabric, on the other hand, since the core yarn is tightened by the sheath yarn,
Since the crimp of the core yarn is originally located at the core, the crimping of the core yarn is unlikely to occur due to the low crimping form of the sweet twist state, and it is unlike ordinary false twisted yarn. There is a drawback that lacks a good stretch property.

On the other hand, a method of obtaining a stretch property by using a side-by-side type conjugate yarn as a low elongation filament yarn constituting a core yarn is known. However, in order to develop crimp of the conjugate yarn, a conjugate yarn is required. Because it is necessary to minimize the binding force acting on the gate yarn as much as possible, strong twisting cannot be applied, the fabric structure must be loosened, or the fabric tends to be thickened due to the appearance of crimping. In addition, there is a characteristic that the crimp is sagged by elongation and it is difficult to return to the original size, and there is a great limitation in use.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a spun-like yarn using a composite false-twisted yarn with a stretch property excellent in elongation recovery, and furthermore, to reduce the binding force of medium to strong twist. It is also to provide a stretch property that can endure.

[0006]

Means for Solving the Problems In order to achieve the above object, the present inventors have found that the elastic recovery characteristic of polytrimethylene terephthalate fiber after extensional deformation is imparted to other fibers such as polyethylene terephthalate fiber. In particular, the inventors paid attention to the point that stretchability was obtained not only by the stretchability of the crimped form but also by the expansion and contraction of the fiber itself. That is, by using polytrimethylene terephthalate fiber as the core yarn, even if the core yarn is tightened by the sheath yarn and crimping of the core yarn is inhibited, sufficient stretchability to obtain a comfortable wearing feeling is obtained. In addition, since it does not rely only on the crimped form, it is possible to design with a normal cover factor without applying medium or strong twist to composite false twisted yarn or designing the fabric structure to be particularly loose. It has been found that the present invention can be performed, and the present invention has been achieved.

That is, in order to solve the above-mentioned problem, after two kinds of filament yarns having different elongations are aligned and entangled, a low elongation side filament yarn obtained by performing false twisting is positioned at the core. In the composite false twisted yarn, around which the high elongation side filament yarn is wound and coated in a sheath shape,
An object of the present invention is to provide a stretchable composite false twisting yarn, wherein the low elongation filament yarn constituting the core yarn is a polytrimethylene filament yarn.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of obtaining a stretchable composite false twisted yarn of the present invention will be described with reference to the drawings. FIG.
1 is an example of a side view of a false twisting machine used in the present invention.
A first feed roller 1 and a second feed roller 1
Entangling is applied between the supply roller 3 using the air entanglement nozzle 2, and then, between the second supply roller 3 and the take-out roller 6, false twisting is performed using the heater 4 and the twisting device 5. By applying the method, the stretchable composite false twisted yarn 7 of the present invention is obtained.

Here, the elongation of the polytrimethylene terephthalate filament yarn constituting the core of the stretchable composite false twisted yarn 7 is preferably set in the range of 30 to 60%. That is, if the elongation is too large, the elongation under a constant load increases, but the elastic recovery rate decreases, while if the elongation is too low, the elastic recovery increases, but the elongation under a constant load increases , The elongation of 30 to 60% is the optimum level from the practical balance between the elongation and the elastic recovery. Therefore, when the false twisting is performed in a substantially constant length state, that is, in a state of about 5% relaxation to 5% elongation as a supply raw yarn, a polytrimethylene terephthalate drawn yarn having an elongation of 30 to 60% and a core yarn are used. A combination with a high elongation yarn capable of being appropriately wound-coated, for example, a highly oriented unoriented yarn of polyethylene terephthalate having an elongation of 100 to 200% is suitable. In particular, when polyethylene terephthalate highly oriented undrawn yarn is used for the high elongation side yarn, it is dyed deeply in the dyeing, and the dyeing density of the core yarn and sheath yarn is similar because the polytrimethylene terephthalate yarn of the core yarn is deeply dyed. As a result, a uniform dyeing effect can be obtained as a whole yarn, which is preferable. Further, although the dyeing fastness of the polytrimethylene terephthalate yarn of the core yarn tends to be slightly inferior, it is preferable that the polyethylene terephthalate yarn having good dyeing fastness is wound and covered as a sheath yarn, and the dyeing fastness is reduced and improved at the same time.

On the other hand, when the false twisting is performed while being stretched, the raw yarn has an elongation of 70 to 100% of about 4000.
Polytrimethylene terephthalate filament raw yarn obtained by ultra-high speed spinning of ~ 6000 m / min and elongation of 1
50-250% polyethylene terephthalate highly oriented undrawn yarn, or about 2% having an elongation of 100-160%
A highly oriented undrawn yarn of polytrimethylene terephthalate spun at a speed of 400 to 3500 m / min and an elongation of 250
A combination of unstretched polyethylene terephthalate yarns of up to 400% is suitable, and false twisting is performed at a draw ratio such that the elongation of the polytrimethylene terephthalate filament is 30 to 60%.

The denier ratio between the core yarn and the sheath yarn is 20: 8.
0 to 50:50 is preferred. When the core yarn ratio is 20% or less, the core yarn and the sheath yarn are easily separated, and when it is 50% or more, the stress at the time of elongation becomes too large and the span feeling is reduced. In addition, single fiber denier, cross-sectional shape, etc. should be selected according to the application. When a polyethylene terephthalate filament yarn is used for the sheath yarn, a third component is added to or copolymerized with the polymer to provide grooves or irregularities on the fiber side surface, and the dyeing is carried out under normal pressure dyeing and cationic conditions. Properties such as tintability and hygroscopicity, and further, antifouling property, ultraviolet ray preventing property, anti-permeability, and bacteriostatic property may be appropriately imparted depending on the application.

Next, the entangling process by the air entangling nozzle 2 is as follows.
This is for preventing separation and displacement of the core yarn and the sheath yarn after the composite false twisting, and the interlacing is performed in a state where the yarn is relaxed by 1 to 3% between the first supply roller 1 and the second supply roller 3. It may be entangled with a nozzle, or the yarn may be 3-1
It may be entangled with a Taslan nozzle in a state of being relaxed by 0%.
The frequency of confounding at this time is suitably about 30 to 60 / m. If the amount is less than this, the core and the sheath are easily separated, and if the amount is too large, untwisting occurs and the appearance of the fabric is easily damaged.

Next, the false twisting between the second supply roller 3 and the take-out roller 6 is performed by a spindle type or belt type twisting device when a polytrimethylene terephthalate raw yarn having an elongation of 30 to 60% is supplied. , Elongation 70-100
When a polytrimethylene terephthalate raw yarn having an elongation of 10% or more is supplied and stretch false twisting is performed, a friction type or belt type twisting device is suitable. The former has an advantage that the number of false twists can be set low, so that the cross-sectional deformation during false twisting can be reduced. On the other hand, the latter has a merit that the processing speed can be increased, so that the processing cost can be reduced.

The temperature of the heater 4 is 110-200.
C is preferred. That is, at 110 ° C or lower, both the core yarn and the sheath yarn have large boiling water shrinkage, and the dyeing property and crimping property tend to differ between the inner and outer layers of the cheese during twist setting of the twisted cheese. However, there is a drawback that untwisting is apt to occur and the appearance is impaired.

When a normal pressure dyeable type polyethylene terephthalate yarn (copolymerized or blended with aliphatic dicarboxylic acid and / or polyoxyalkylene glycol) is used as the high elongation side yarn, the low elongation side yarn is used. Polytrimethylene terephthalate yarn can also be dyed considerably under normal pressure, so that it can be interwoven with other materials such as wool and acetate, and the merit of greatly expanding applications can be obtained.

In using the composite false twisted yarn of the present invention described above, since the core yarn is composed of polytrimethylene terephthalate yarn and the stretch elastic recovery is good,
You may give a real twist beforehand. The number of twists may be appropriately selected according to the application, but the denier of the composite false twisted yarn is D,
When the number of twists is T (times / m), T × D ^1/2 ≧ 2000
It has good stretchability even when a real twist satisfying 0 is given.

[0017]

The present invention will be described in more detail with reference to the following examples, which should not be construed as limiting the invention thereto.

[Example 1] As the low elongation side raw yarn A, a 50 denier 24 filament and a 50% elongation polytrimethylene terephthalate drawn yarn were used, and as the high elongation side raw yarn B, 80 denier 36 filament, elongation was used. 120% polyethylene terephthalate high-orientation unoriented yarns are used, and they are aligned and supplied to the first supply roller 1, and the interlaced nozzle is set in a state where the traveling yarn is relaxed by 1.5% between the first supply roller 1 and the second supply roller 3. 2 to obtain a mixed fiber having 51 interlaces / m.

Next, between the second supply roller 3 and the take-out roller 6, the mixed fiber is twisted and untwisted through a spindle type twisting device 5 while relaxing the mixed fiber by 1.5%. The twisted portion was heat-set at 160 ° C. with a heater 4 at the same time, and wound with a winder 7 as a stretchable composite false twisted yarn of 135 denier and 60 filaments. The number of false twists at this time was 2500.
Times / m, the surface speed of the take-out roller was 180 m / min, and the length of the heater 4 was 1.5 m.

The obtained stretchable composite false twisted yarn is twisted at 2,000 turns / m in a direction opposite to the false twisting direction, and a test length of 20 times.
An elongation at 0 mm and a stress-strain curve at 10% elongation and recovery at a recovery speed of 100% / min were drawn to determine the elastic recovery, and it was surprisingly shown that the recovery was 92%.

Next, a fabric having a single mat structure with a warp density of 118 yarns / inch and a weft density of 80 yarns / inch was trial-produced using this yarn, and a stress-strain curve at the time of recovery of 10% elongation was drawn. As a result, a good recovery rate of 94% in the warp direction and 92% in the weft direction was shown. In addition, the obtained woven fabric grade was uniform in dyeing properties, did not have a fluffy texture due to crimping as in conventional false twisted yarn, and was a high-quality stiff fabric.

[Comparative Example 1] As the low elongation side raw yarn A, a 50 denier 24 filament, a polyethylene terephthalate drawn yarn having an elongation of 48% was used, and the high elongation side raw yarn B was 80
Using denier 36 filaments and polyethylene terephthalate highly oriented undrawn yarn having an elongation of 120%, each was aligned and subjected to composite false twisting under the same conditions as in Example 1.
A composite false twisted yarn of 33 denier and 60 filaments was obtained. The number of interlaces by the interlace nozzle 2 at this time was 46 / m.

The obtained composite false twisted yarn was twisted at a rate of 2000 times / m in the same manner as in Example 1, and the elastic recovery was measured to be at most about 51%.

Next, a one-piece mat fabric was trial-produced under the same specifications and conditions as in Example 1, and the elastic recovery was measured. As a result, the warp direction was 54% and the weft direction was 59%. In addition, as for the appearance of the fabric, the dyeing difference between the core yarn and the sheath yarn is large, and streak-like spots, which are thought to be due to marbled light and light spots and confounding spots of the core-sheath, are noticeable. It was inferior.

[Comparative Example 2] A 50 denier 24 filament in which polyethylene terephthalate having an intrinsic viscosity of 0.43 and 0.69 was bonded to a so-called side-by-side type conjugate at a ratio of 1: 1 as a low elongation side yarn A,
A polyethylene terephthalate composite yarn having an elongation of 33% was used, 80 denier 36 filaments were used as the high elongation side yarn B, and a polyethylene terephthalate highly oriented undrawn yarn having an elongation of 120% was used. The composite false twisting was performed under the following conditions to obtain a composite false twisted yarn of 134 denier and 60 filaments. At this time, the number of interlaces by the interlace nozzle 2 is 44 / m
Met.

The obtained composite false twisted yarn was twisted at a rate of 2000 times / m in the same manner as in Example 1, and the elastic recovery was measured.

Next, a fabric was prototyped under the same conditions as in Example 1 except that the density was reduced by 5% from the fabric standard of Example 1, and the elastic recovery was measured. Although it was 78%, which is higher than that of Comparative Example 1, the performance was still insufficient for practical use.

The quality of the fabric is probably due to the crimped form of the core yarn composite yarn, it is slightly thicker, has a slightly rubbery feel to the touch, and also depends on the dyeing difference between the core yarn and the sheath yarn. Marbling and partially streak-like spots were also observed, and the quality was not very good.

[0029]

According to the present invention, the dyeability of the appearance is uniform, and it does not have the texture and rubber-like feeling of the conventional false twisted yarn, but has firmness, good elastic recovery, and stretchability. Can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a false twisting apparatus for carrying out the present invention.

FIG. 2 is a yarn side view showing an example of a stretchable composite false twisted yarn obtained by the present invention.

[Explanation of symbols]

 A Polytrimethylene terephthalate yarn B High elongation filament yarn 1 First supply roller 2 Air entangled nozzle 3 Second supply roller 4 Heater 5 False twisting device 6 Take-out roller 7 Winder

Claims (5)

[Claims] 1. A low elongation side filament yarn obtained by subjecting two kinds of filament yarns having different elongations to a uniform twist and then performing a false twisting process, wherein the low elongation side filament yarn is located at a core, and the high elongation side filament is surrounded therearound. A stretchable composite false twist, wherein the low elongation filament yarn constituting the core yarn is a polytrimethylene terephthalate filament yarn in the composite false twisted yarn in which the yarn is wound and covered in a sheath shape. Processing thread. 2. The stretchable composite false twisted yarn according to claim 1, wherein the filament yarn on the high elongation side is a polyethylene terephthalate filament yarn. 3. The stretchable composite false twisted yarn according to claim 1, wherein the polytrimethylene terephthalate filament yarn as a core yarn has an elongation of 30 to 60%. 4. The filament of claim 2, wherein the polyethylene terephthalate filament yarn is a normal pressure dyeable yarn obtained by copolymerizing a polyethylene terephthalate polymer with an aliphatic dicarboxylic acid and / or copolymerizing or blending a polyoxyalkylene glycol. Stretch composite false twisted yarn. 5. The composite twisted yarn according to claim 1, which has a real twist satisfying T × D ^1/2 ≧ 20,000 when the denier is D and the number of twists is T (twice / m). The stretchable composite false twisted yarn according to any one of the preceding claims.