JPH0860466A - Core-sheath type interlaced blended yarn having loop fuzz - Google Patents

Abstract

PURPOSE: To provide a core sheath type interlaced blended yarn having looped fuzzes capable of giving excellent bulkiness and spun-like properties to a knitted and woven fabric with not only solving problem of shrinkage of looped fuzzes by heat treatment but enlarging those sizes. CONSTITUTION: This core-sheath type interlaced blended yarn consists of at least 2 multi-filament threads and has looped fuzzes on their surface. The thread mainly forming the sheath part has <=0% heat shrinkage factor and the thread mainly forming the core part is heat shrinkable and has <=50% residual elongation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core-sheath type entangled mixed yarn having loop fluff and slack on the surface.

[0002]

2. Description of the Related Art A core-sheath type entangled mixed yarn having loop fluff and slack on its surface is known as so-called Taslan textured yarn and air jet textured yarn. Since these have loops and slack, when they are woven or knitted, they are long fibers but exhibit a texture like spun-like and bulky.

However, in the conventional air-jet processed yarn, the yarn having loop fluff and slack is heat-shrinkable, so that the loop fluff and slack are contracted by the heat received in the dyeing and finishing process and the size thereof is reduced. However, there was a problem that the spun-like property and bulkiness decreased.

As a method for solving this problem, there is a method of pre-heat treating the yarn before forming the loop fluff.
There is no change in the fact that it is heat-shrinkable simply because the heat-shrinkage rate becomes small, and its effect is small. If the size of loop fluff or slack before heat treatment is increased in consideration of heat shrinkage, the unwinding property from the wound body may become poor,
There was a problem that it was easy to get caught in a guide, etc., and the process passability deteriorated. Therefore, it was necessary to limit the size of the loop fluff before the heat treatment, taking into consideration process passability, etc., knowing that the size of the loop fluff becomes smaller by the heat treatment in the post process.

Further, when the air jet textured yarn is used as the warp yarn of the woven fabric, even if the textured yarn having a relatively small loop fluff is used, the warp yarns are entangled with each other during weaving, resulting in poor shedding, resulting in a marked decrease in operability. Therefore, it is common to twist the air-jet processed yarn having a small loop fluff to further reduce the loop fluff on the surface and then use it for the warp. Moreover, since these loop fluffs are further reduced by heat treatment such as dyeing and finishing as described above, there is a limit to improvement in span-like property and bulkiness.

On the other hand, a blended yarn of a yarn having a hot water shrinkage ratio of 0% or less and a heat shrinkable yarn, which is called a spontaneously stretched yarn, has been conventionally known. These are mixed yarns that are entangled or twisted by interlacing, and have virtually no loop fluff or slack, so there is no particular problem with processability and weavability, and even after being woven or knitted, By the heat treatment, the spontaneously stretched yarn floats on the surface of the woven or knitted fabric in a loop shape, so that a woven or knitted fabric having bulkiness and spun-like property can be obtained.

However, even if an attempt is made to increase the spontaneous elongation rate of the spontaneous elongation yarn that directly affects the size of the loop fluff in order to improve the bulkiness and the span-like property, there is a manufacturing limit.

Further, even if a yarn having a high spontaneous elongation is obtained, the bulkiness and the span-like property of the woven or knitted fabric are improved,
It is difficult to change these levels according to the purpose.

Therefore, when it is desired to change the bulkiness and spun-like property according to the purpose and application, it is necessary to prepare yarns having various spontaneous elongation rates. However, the increase in production brands of intermediate products raises the problem that the operating rate decreases due to the frequent switching of brands, the management becomes complicated, and the cost increases.

[0010]

In view of such a situation, the present invention not only solves the problem that the loop fluff of the entangled mixed fiber yarn is reduced by the heat treatment in the subsequent step, but further Technically, it is possible to provide a core-sheath type entangled mixed fiber having loop fluff that can increase the size and can impart excellent bulkiness and spanlike property to a woven or knitted product obtained by weaving and knitting. It is an issue.

[0011]

The present inventors have arrived at the present invention as a result of earnest research to solve the above-mentioned problems. That is, in the present invention, in a core-sheath type entangled mixed fiber yarn having at least two multifilament yarns and having loop fluffs on the surface, the yarns mainly forming the sheath portion have a heat shrinkage rate of 0% or less. A core-sheath type entangled mixed filament yarn having loop fluff is characterized in that the yarn mainly forming the core portion is heat-shrinkable and has a residual elongation of 50% or less.

The present invention will be described in detail below.

The core-sheath type entangled mixed filament yarn of the present invention is composed of at least two multifilament yarns, and has loop fluff and slack on the surface. In the entangled mixed filament yarn, the yarn (sheath yarn) forming the sheath has a heat shrinkage rate of 0% or less, that is, a so-called spontaneously stretched yarn whose length after heat treatment is longer than that before treatment is used. is necessary.

The heat shrinkage rate in the present invention means the shrinkage rate in the usual hot water treatment (treatment temperature of about 100 ° C.), but even if it does not exhibit spontaneous elongation in hot water, it does not have a dyeing finish or the like. Any yarn that exhibits spontaneous elongation at a dry heat temperature or a wet heat temperature lower than the maximum heat treatment temperature received in the subsequent step can be used in the present invention. The heat shrinkage of the sheath yarn needs to be 0% or less at any treatment temperature, but it is preferably -2% or less, and particularly preferably -3% or less for the warp of the woven fabric (spontaneous elongation ratio). Therefore, it is preferably 2% or more, and particularly preferably 3% or more).

It is also necessary in the present invention that such a spontaneously extending yarn forms loop fluff or slack as a sheath yarn. As a result, even after dyeing and finishing after weaving, weaving and weaving do not reduce loop fluff and slack unlike the conventional air-jet processed yarn, and the heat shrinking action of the yarn forming the core part is also combined. On the contrary, since the size of the loop fluff becomes large, it becomes possible to improve the bulkiness and the span-like property.

The air-jet processing method is a preferred method for producing the core-sheath type entangled mixed yarn, but the entangled mixed yarn of the present invention is
It can be manufactured by a method similar to the conventional method. During processing, the size of loop fluff and slack is set by appropriately setting the difference in supply rate (supply speed difference) of the heat-shrinkable fiber, which is the sheath yarn, and the heat-shrinkable fiber, which is the core yarn, to the air jet nozzle. Therefore, if there is a kind of spontaneously stretchable yarn, it is possible to freely change the bulkiness of the finally obtained woven or knitted fabric by combining with the air jet processing conditions. Therefore, there is no need to unnecessarily increase the brand of spontaneously stretched yarn, which is industrially advantageous.

In the conventional woven and knitted fabric made of the mixed yarn in which the heat-shrinkable fiber and the interlaced yarn or the intertwisted yarn are mixed with each other without providing the loop fluff to the spontaneously stretched yarn, the loop fluff is produced at the time of dyeing and finishing. It appears and becomes bulky,
As described above, it is difficult to control the bulkiness, and various woven and knitted fabrics cannot be obtained from a constant supply yarn.

In the present invention, the loop fluff and slack existing on the surface may be partially formed by the core yarn, but it is necessary that the loop fluff and the slack are mainly formed by the spontaneously extending yarn which is the sheath yarn. The number of loop fluffs and slacks may be set appropriately according to the application, but usually the height of the loop fluffs is
It is preferable that particles having a size of 0.3 mm or more are present in the range of 30 to 350 pieces / m. In addition, when used for the warp of the woven fabric,
It is preferable to reduce the number of loop fluffs as a whole, to reduce the number of loop fluffs having a high height, or to reduce the height of loop fluffs by twisting a mixed yarn. Since the weavability varies depending on the density of the woven fabric, the type of the loom, etc., the weaving property may be appropriately set accordingly.

In the present invention, the spontaneously extending yarn constituting the sheath yarn is not particularly limited as long as it is a multifilament made of a polymer capable of imparting spontaneously expanding property.
Usually, a homopolyester represented by polyethylene terephthalate (PET) or a copolyester containing a third component is preferably used. Further, a multifilament made of polyamide represented by poly-ε-caprolactam (nylon 6), polyhexamethylene adipamide (nylon 66), and copolyamide can be used.

As a method of imparting spontaneous elongation to these multifilaments, for example, a low orientation undrawn yarn is used in the range of medium orientation degree region (in the case of PET, birefringence is 15
There is a method of orienting in the range of × 10 ^-3 to 80 × 10 ^-3 ) or slightly orienting a highly oriented undrawn yarn, and then performing a relaxation heat treatment at a high relaxation rate of about 30% or more.

Next, in the present invention, as the yarn (core yarn) mainly forming the core, it is necessary to use a yarn having a heat shrinkability and a residual elongation of 50% or less. It is preferable to use a spontaneously stretchable yarn for the core yarn, because both the core yarn and the sheath yarn are stretched, and the texture of the woven or knitted fabric after dyeing finish becomes loose, and the range of application is extremely limited or the commercial value is reduced. Absent. The hot water shrinkage of the core yarn is preferably 5 to 30%.

The residual elongation (breaking elongation) of the core yarn is 50%.
Must be: When the residual elongation exceeds 50%, the core-sheath type entangled mixed filament yarn becomes particularly weak against pulling and lacks in morphological stability. Therefore, the tension during unwinding from the wound body or during weaving or weaving The morphology changes due to fluctuations, and the quality of the obtained woven or knitted product deteriorates. 15 as the residual elongation of the core yarn
About 45% is preferable. The core yarn may be a non-crimped flat yarn, an actual or latently crimped yarn.

The yarn to be the core yarn may be produced by polymerization, spinning and drawing by a conventional method, but the heat shrinkage ratio of the core yarn may be controlled by appropriately setting the conditions of each step. You can

The core-sheath type entangled mixed filament yarn of the present invention is composed of at least the above-mentioned sheath yarn and core yarn, and mainly has loop fluff and slack formed in the sheath yarn, and the core yarn and the sheath yarn are entangled,
It has a mixed morphology. If there is no entanglement between the sheath yarn and the core yarn, even if loop fluff or slack is temporarily formed, its shape is changed or disappears due to the tension in the subsequent step, which is not preferable.

The method for producing the core-sheath type entangled mixed filament yarn of the present invention uses a spontaneously stretching yarn and a heat-shrinkable stretched yarn, wherein the spontaneously stretchable yarn is a sheath yarn and the heat-shrinkable stretched yarn is a core yarn. In supply rate,
A method for forming loop fluff, slack, or entanglement by supplying it to a loop fluff forming nozzle that has a propelling action by a fluid in the running direction of the yarn, that is, a so-called Taslan nozzle or an air jet nozzle is preferable.

The above-mentioned supply rate is determined by the surface speed of the supply roller on the upstream side of the nozzle and the surface speed of the take-up roller on the downstream side, and the difference between the supply speed and the take-up speed is divided by the take-up speed and expressed as a percentage. It is a value (%). The supply rate of the heat-shrinkable stretched yarn that becomes the core yarn is 2 to 20%, and the supply rate of the spontaneously elongated yarn that becomes the sheath yarn is larger than the supply ratio of the core yarn, and preferably in the range of 5 to 40%.

Further, the yarn length difference between the sheath yarn and the core yarn, that is,
When the difference in supply rate is 2 to 10%, particularly preferably 3 to 8%, the loop fluff and slack of the resulting entangled mixed fiber yarn are at a level at which they can be used as warp yarns for textiles (even when twisting yarns are required, In addition, it is preferable that the yarn is woven and then subjected to dyeing finish processing, because the spontaneously extending yarn as the sheath yarn is elongated and exhibits excellent bulkiness.

The nozzle used in the production of the entangled mixed filament yarn of the present invention may be a Taslan nozzle or a commercially available air jet nozzle as long as it has a loop fluff forming ability, but air is preferable as the fluid supplied to the nozzle. The air pressure during supply is preferably ² to 8 kg / cm ² .

[0029]

EXAMPLES Next, the present invention will be specifically described by way of examples. The methods for measuring the hot water shrinkage ratio and the number of loop fluffs in the examples are as follows.

(1) Hot Water Shrinkage Ratio Measured by the JIS L1090B method. (2) Number of loop fluff (F value) Optical fluff counter (F-INDEX TESTE made by Shikishima Spinning Co., Ltd.
R) was used to set the loop fluff height to 0.3 mm and 0.7 mm. For example, if the height of loop fluff is set to 0.3 mm, only loop fluff with a height of 0.3 mm or more is detected.

Examples 1-2 and Comparative Example 1 The birefringence obtained by the conventional high-speed spinning method is 54 × 10 ^-3.
Using the PET multifilament of No. 3 as the feed yarn, draw at a drawing temperature of 90 ° C and a draw ratio of 1.1 times, and then draw at a temperature of 150 ° C.
Relaxation heat treatment was performed at a relaxation rate of 100%, and the hot water shrinkage rate was −6.
4% spontaneously stretchable yarn 145d / 36f for sheath yarn was obtained. Also,
As a heat-shrinkable yarn for core yarn, PET stretched yarns 75d / 24f with hot water shrinkage of 10.2% and residual elongation of 36% were obtained by a conventional spinning and drawing two-step method. Then, a supply roller for the sheath yarn, a supply roller for the core yarn, a commercially available loop fluff forming nozzle connected to an air compressor (Heverline Co., Hemajet T-311 type), a take-up roller, and a winding device were sequentially provided. A core-sheath type entangled mixed filament yarn was produced under the processing conditions shown in Table 1 by using a processing machine and using the above-mentioned spontaneously stretched yarn and heat-shrinkable yarn. Further, the entangled mixed yarn obtained in Example 2 was used as 300T.
twisted at / m. On the other hand, as Comparative Example 1, instead of the spontaneously stretched yarn, PET false twisted yarn 150d / 36f having a hot water shrinkage ratio of 3.6%
An entangled mixed-fiber yarn was manufactured by using the cocoon yarn as the sheath yarn. The F value was measured for the obtained entangled mixed filament yarn and those obtained by hot water treatment of these yarns at 130 ° C. for 30 minutes. The F values are also shown in Table 1.

[0032]

[Table 1]

As is clear from Table 1, in the core-sheath type entangled mixed yarns obtained in Examples 1 and 2, the number of loop fluffs increased and the size of the loop fluffs also increased by the heat treatment.

Further, weaving is performed using these entangled mixed fiber yarns, and dyeing and finishing processing is carried out by an ordinary method to obtain woven products (all
2/2 twill, warp density 96 / 2.54cm × weft density 68 / 2.5
4 cm) was obtained. In addition, regarding the yarn usage, in Example 1 and Comparative Example 1, the yarn obtained above was used as the weft, and the warp was 150d / 36f.
PET stretched yarn of was used. In Example 2, the yarn (with twisted yarn) obtained above was used for the warp and the weft. Woven fabrics using the core-sheath type mixed fiber entangled yarns obtained in Examples 1 and 2 are
The bulkiness and spun-like property were extremely excellent as compared with the woven fabric of Comparative Example 1.

[0035]

According to the present invention, it is possible not only to solve the problem that the loop fluff and slack of the conventional entangled mixed fiber yarn are reduced by heat treatment, but also to further increase their size by heat treatment. Provided is a core-sheath type entangled mixed fiber yarn capable of imparting excellent bulkiness and spun-like property to a woven or knitted product obtained by weaving and knitting.

Further, if the difference in yarn length between the core yarn and the sheath yarn is made small, it can be used as a warp of a woven fabric, and an excellent bulky fabric can be obtained.

Claims (1)

[Claims] 1. A core-sheath type entangled mixed filament yarn comprising at least two multifilament yarns and having loop fluffs on the surface, the yarns mainly forming the sheath portion have a heat shrinkage rate of 0% or less, A core-sheath type entangled mixed yarn having loop fluff, characterized in that the yarn mainly forming the core is heat-shrinkable and has a residual elongation of 50% or less.