JP2960753B2 - Method for producing composite entangled yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention provides a sheath yarn and a polyester non-crimp yarn obtained by simultaneously drawing and twisting a highly oriented polyester undrawn yarn to form a core yarn. The present invention relates to a method for producing a composite entangled yarn having a core-sheath two-layer structure, which has a moderate loop fluff on the yarn surface and is suitable for obtaining a woven and knitted fabric having a high bulkiness.

(Prior Art) Hitherto, many methods have been proposed for producing a bulky yarn having a two-layer structure by combining a false twisting technique and a fluid disturbance treatment technique. For example, Japanese Patent Publication No. Sho 60-11130 proposes a method for producing a two-layered yarn in which two undrawn yarns having a difference in elongation are subjected to a fluid disturbance treatment and then subjected to simultaneous drawing false twisting. I have. However, this method uses the difference in elongation of the supply yarn to give a difference in yarn length and forms a two-layer structure, so that the difference in yarn length necessary to impart sufficient bulkiness is obtained. It is difficult to adjust the yarn length difference to an arbitrary size at the yarn processing stage.

In addition, the false twisted crimped yarn and the non-crimped yarn are subjected to a fluid disturbance treatment to obtain
It is already known that, when a layered yarn is manufactured, by using a low crimped yarn obtained by processing with a low number of false twists as a false twisted crimped yarn, entanglement and loop formability can be enhanced. is there.

The present inventors have also conducted a study on a method of producing a bulky yarn having a two-layer structure by false twisting and fluid disturbance treatment, and disclosed in Japanese Patent Publication No. 63-56331 and Japanese Patent Application Laid-Open No. 63-165550. Proposed. In these methods, the false-twisted yarn and another yarn are supplied to the fluid disturbance region with a difference in overfeed ratio to obtain a yarn length difference. A sufficient yarn length difference. However, these methods also use a spindle type twisting device as a false twisting means because low crimped yarn is required to enhance the effect of forming loops and entanglement.
In high-speed machining at a speed of 00 m / min or more, there is an inherent problem in practical use, such as the filament is easily cut and the workability is reduced.

In order to perform the above processing at a high speed, it is conceivable to employ a friction false twisting method. However, this method cannot stably produce a low crimped yarn having a low false twist number.

In other words, in general, even if an attempt is made to produce a low crimped yarn having a low false twist number by the friction false twisting method, uneven spreading of the twist causes uneven crimping, and yarn breakage due to a decrease in the driving force of the yarn occurs. For example, there are many practical problems in terms of both yarn quality and workability, and the method cannot be applied to the production of the composite processed yarn.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned drawbacks of the related art, exhibits a core-sheath two-layer structure composed of crimped yarn and non-crimped yarn, and has an appropriate loop fluff on the yarn surface. A technical object of the present invention is to provide a method for producing a composite entangled yarn that has high speed and can stably produce a composite entangled yarn suitable for obtaining a woven or knitted fabric having a high bulkiness. It is.

(Means for Solving the Problems) The present inventors have conducted intensive studies in order to achieve the above-mentioned problems, and as a result, have conducted simultaneous simultaneous friction false twisting on highly oriented polyester undrawn yarn under specific conditions. The present invention has been found to be able to process high quality bulky loop yarns at a high speed by subjecting the crimped yarn to a sheath yarn and the polyester non-crimped yarn to a core yarn and subjecting them to fluid disturbance treatment. Reached.

That is, in the present invention, a crimped yarn obtained by subjecting a polyester highly oriented undrawn yarn to simultaneous drawing and false twisting and a polyester non-crimped yarn are subjected to fluid disturbance at the same time to form loop fluff on the surface of the yarn. This is a method for producing entangled yarns, in which the K value (untwisting tension / twisting tension) is applied to highly oriented polyester undrawn yarn.
1.5 to 7.0, and twisting tension T ₁ is subjected to stretching simultaneously friction false twisting under conditions satisfying 0.1 to 0.3 g / d crimped yarn and none, of polyester non-crimped yarn continuously to the fluid injection nozzle The gist of the present invention is a method for producing a composite entangled yarn characterized by being supplied in excess.

 Hereinafter, the present invention will be described in detail.

First, in the present invention, a drawing simultaneous friction false twisting process is performed on a polyester highly oriented undrawn yarn. In this case, K value (untwisting tension / twisting tension) of 1.5 to 7.0, preferably with 1.7 to 4.0, and the tension T ₁ twisted 0.1 to 0.3 g / d, preferably 0.1 to
It needs to be 0.2 g / d. By performing the stretching simultaneous friction false twisting process while satisfying these two conditions, the effect of forming a loop and entanglement in the subsequent fluid disturbance treatment can be remarkably improved. K value and setting the twist tension T _1, in the above range, the draw ratio during false twisting and D /
Y ratio (peripheral speed of the friction disk / thread sending speed),
What is necessary is just to select suitably considering the disk material etc. of a friction false twist apparatus. Here, when the twisting tension T ₁ are above the 0.3 g / d and /
Alternatively, when the K value is less than 1.5, the crimpability of the yarn becomes too high, so that a sufficient loop and entanglement effect cannot be obtained in the subsequent fluid disturbance treatment. On the other hand, when the K value exceeds 7.0, thread breakage is induced, and workability is reduced. Furthermore, twisting tension T ₁
If is less than 0.1 g / d, both workability and quality deteriorate, which is not preferable. Here, d is a value obtained by dividing the fineness (denier) of the yarn supplied to the draw false twisting area by the draw ratio.

The draw ratio during simultaneous drawing and false twisting depends on the birefringence of the supply yarn. For example, the birefringence is 0.04 to 0.06.
In the case of the polyester highly oriented undrawn yarn, the ratio is preferably about 1.2 to 1.4 times. The D / Y ratio varies depending on the material of the disk, but is preferably 1.3 to 2.5 in the case of a polyurethane disk.

In the present invention, the reason why the polyester highly oriented undrawn yarn is used as the supply yarn for the drawing simultaneous friction false twisting process is to produce a stable quality low crimped false twist yarn at a high speed. Induction of quality and yarn breakage due to twist spots cause lack of practicality.

Next, the crimped yarn obtained by subjecting the polyester highly oriented undrawn yarn to the simultaneous drawing and false twisting process as described above is combined with the polyester non-crimped yarn, and continuously subjected to a fluid disturbance treatment. At this time, the above-mentioned crimped yarn is supplied to the fluid treatment area in excess of the polyester non-crimped yarn. As a result, the crimped yarn becomes a sheath yarn,
The non-crimped yarn is a composite entangled yarn having a two-layer core-sheath structure that forms a core yarn, and a large amount of loop fuzz of different sizes is mainly formed on the surface of the yarn, mainly in a crimped yarn that is a sheath yarn. .

As described above, since the surface of the composite entangled yarn obtained by the present invention is uneven due to the loop fluff, there is no problem even if the crimped yarn as the sheath yarn has some crimp spots.

The overfeed rate during the fluid disturbance treatment is preferably 3 to 7% for the non-crimped yarn serving as the core yarn and 15 to 30% for the crimped yarn serving as the sheath yarn. The air pressure is preferably 5 to 8 kg / cm ² .

 Next, an embodiment of the present invention will be described with reference to FIG.

The polyester highly oriented undrawn yarn Y is fed to feed roller 1,
The crimped yarn is fed into the friction false twisting area via the heater 2 and stretched between the feed roller 1 and the stretching roller 4, while being twisted by the friction type twisting device 3 and heat-fixed by the heater 2. A is supplied from the stretching roller 4 to the fluid jet nozzle 5 at a predetermined overfeed rate.

On the other hand, the polyester non-crimped yarn B is supplied from the feed roller 9 to the fluid jet nozzle 5 at a predetermined overfeed rate lower than that of the crimped yarn A. In this case, the non-crimped yarn B may be supplied to the fluid jet nozzle 5 after drawing the highly oriented undrawn yarn.

Next, the crimped yarn A and the non-crimped yarn B are
The non-crimped yarn B becomes a core yarn and the crimped yarn A becomes a sheath yarn to form a core-sheath two-layer structure yarn, and a loop fuzz is formed on the surface thereof. It is wound on a package 8 by a winding roller 7.

FIG. 2 shows an embodiment of the composite entangled yarn obtained by the present invention, and is a single filament a ₁ , having a loop, obtained by subjecting a polyester highly oriented undrawn yarn Y to simultaneous drawing false twisting. the crimped yarn a is sheath consisting of a ₂ etc., the single filament b _1, consisting of b ₂ etc. polyester non crimped yarn B constitutes a core portion.

In the present invention, the fluid jet nozzle used for the fluid disturbance treatment is not particularly limited.
A so-called Taslan nozzle as described in JP-B-8969 or JP-B-35-1673 is preferred.

(Examples) Next, the present invention will be described specifically with reference to examples.

Example 1 Polyester highly oriented undrawn yarn 110d having a birefringence of 50 × 10 ⁻³
/ 72f (yarn Y) was subjected to simultaneous drawing and false twisting under the conditions shown in Table 1 in accordance with the process shown in FIG. The number of false twists (measured) under these conditions was 1840 (T / M).

Next, the false twisted yarn obtained above and the drawn polyester yarn of 75d / 36f were combined and subjected to a fluid disturbance treatment under the conditions shown in Table 1 to produce a composite entangled yarn.

In the obtained composite entangled yarn, a core-sheath 2 in which a crimped yarn A obtained by subjecting a polyester highly-oriented undrawn yarn Y to simultaneous drawing and false twisting processing constitutes a sheath yarn, and a polyester non-crimped yarn B constitutes a core yarn. It was a layered yarn.

Next, the composite entangled yarn is arranged on the front side, and the ordinary polyester false twisted yarn 150d / 30f is arranged on the back side to form a double-nit reversible structure. ， A product with excellent waist was obtained.

(Effects of the Invention) According to the present invention, a composite entanglement having a core-sheath two-layer structure excellent in bulkiness, tension, and stiffness in which a crimped yarn is arranged on a sheath side and a non-crimped yarn is arranged on a core side. Yarn can be obtained.

In addition, since the crimped yarn obtained by simultaneous drawing and false twisting has low crimping properties, it has good entanglement with non-crimped yarns in fluid disturbance treatment. Can be obtained.
It is possible to improve productivity.

[Brief description of the drawings]

FIG. 1 is a schematic process diagram showing one embodiment of the present invention, and FIG.
The figure is a schematic view showing one embodiment of the composite entangled yarn obtained by the present invention. 1,9: Feed roller 2: Heater 3: Friction false twist device 4: Stretching roller 5: Fluid jet nozzle 6: Delivery roller 7: Winding roller 8: Package Y: Polyester highly oriented undrawn yarn A: Crimped yarn B: Non Crimped yarn

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F-term theme code 4L036

Claims (1)

(57) [Claims] 1. A entanglement for forming a loop fluff on the surface of a yarn by simultaneously subjecting a crimped yarn obtained by simultaneously drawing and drawing a highly oriented polyester unoriented yarn and a polyester non-crimped yarn to fluid disturbance. A method for producing yarn, wherein a K value (untwisting tension / twisting tension) is 1.5 to 7.0,
And twisted tension T ₁ is subjected to stretching simultaneously friction false twisting under conditions satisfying 0.1 to 0.3 g / d crimped yarn and without excessively supplied from the polyester non-crimped yarn continuously to the fluid injection nozzle A method for producing a composite entangled yarn.