JPH08199438A - Fused false-twisted yarn having fancy effect - Google Patents

Abstract

PURPOSE: To obtain a fused false-twisted yarn having a difference between deep and light dyeing properties in the longitudinal direction of the yarn, capable of imparting good tension and stiffness to a web, and having a fancy effect. CONSTITUTION: This false-twisted yarn comprises filaments wherein at least a part of their surfaces is composed from a copolyester which has a lower melting point than that of polyethylene terephthalate, contains ethylene terephthalate units as main repeating units and is copolymerized with one or more of other components. The false-twisted yarn alternately has deeply dyeable parts A and lightly dyeable parts B in the longitudinal direction, and is bulky. The deeply dyeable parts are partially fused and collected. The lightly dyeable parts are not fused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fused false-twisted yarn having a fancy effect capable of imparting elasticity and stiffness to a cloth, which has a difference in dark and light dyeability in the longitudinal direction of the yarn.

[0002]

2. Description of the Related Art As a fused false-twisted yarn obtained by false-twisting at a temperature at which the yarn is fused, the untwisted portion and the untwisted portion are both fused and the untwisted portion is fused. It is known that a textured yarn that does not fuse the over-twisted portion and becomes the bulky crimped portion. Of these textured yarns, the former has a surface effect due to S / Z alternating twists, and the latter has a fancy effect due to the fused untwisted portion and bulky overtwisted portion. The processed yarn of No. 1 did not have a difference in tint dyeing property.

On the other hand, the applicant of the present invention discloses, in Japanese Patent Publication No. Sho 63-23295, a textured yarn obtained by intermittently applying a liquid to a false twist textured yarn, which has a low bulkiness portion and a high bulkiness portion alternately. Although it was proposed, there was no difference in the tint dyeing property of this processed yarn, and neither the low bulky part nor the high bulky part was fused, so that even when weaving or knitting, it was not possible to impart elasticity or stiffness to the fabric. .

Therefore, the applicant of the present invention has filed in Japanese Patent Application Laid-Open No. 6-101131.
In the gazette, a textured yarn having a difference in dark and light dyeing properties in the longitudinal direction of the yarn and a part of the filaments of the deep dyeing part and the light dyeing part fused is proposed. However, in this processed yarn, both the deep-dyeing portion and the light-dyeing portion are fused and bundled together, so the fabric obtained by weaving and knitting has a clear dark and light pattern effect and has a coarse and hard feeling. However, the unevenness due to the difference in thickness and the fanci effect in which the pattern part can be seen through were lacking. Further, since the false twisting temperature is set to a considerably high temperature in order to fuse the yarns, there is a problem that variations among the weights are likely to occur and the product yield is low.

Further, in Japanese Patent Publication No. 3-77293, a highly oriented polyester unstretched yarn is subjected to a relaxation heat treatment, then cold stretched to produce thick spots, and then obtained by fusion false twisting. A thick and thin textured yarn has been proposed. However, since this textured yarn is a deep dyeing part and a light dyeing part due to stretch unevenness, both are extremely short,
For this reason, it was not possible to impart the shade pattern effect to the fabric.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks and provides a cloth obtained by weaving and knitting with a strong twist-like tension,
It is a technical subject to provide a fused false twisted yarn capable of imparting a firmness and a clear shade pattern effect, and further, a feeling of unevenness and a fanci effect in which the pattern portion can be seen through.

[0007]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors lowered the melting point of polyethylene terephthalate (PET) by copolymerizing ethylene terephthalate units with other components. If a yarn composed of filaments containing copolyester is heat-treated intermittently and then subjected to draw false-twist processing at an appropriate temperature, the portion of the yarn that has been heat-treated before false-twist processing The present inventors have reached the present invention by discovering that a portion which is fused and exhibits a deep dyeing property, and on the other hand, a portion which is not heat-treated before the false twisting process is not fused even by the stretch false twisting process and becomes bulky.

That is, according to the present invention, the main repeating unit is an ethylene terephthalate unit, the other components are copolymerized, and at least a part of the surface is composed of a copolyester having a melting point lower than that of polyethylene terephthalate. A false-twisted yarn having alternating deep-dyeing and light-dyeing portions in a direction, wherein the filaments forming the yarn have no substantial thick and thin spots, and a part of the filament of the deep-dyeing portion Are fused and converged, and the light dyeing part is not fused,
Further, the gist is a fused false-twisted yarn having a fancy effect, which is characterized by being bulky.

The present invention will be described in detail below.

The fusible false-twisted yarn having the fancy effect of the present invention has an ethylene terephthalate unit as a main repeating unit, is copolymerized with other components, and is a copolyester having a melting point lower than that of PET, and at least a part of the surface thereof is It is composed of multiple filaments, and there is no substantial thick and thin spots between filaments.

The fused false-twisted yarn of the present invention may be composed only of the above-mentioned copolyester, but a core-sheath structure or a side-by-side type composite in which the copolyester is arranged in the sheath and PET is arranged in the core It may be a fiber, and of these, a latent crimping side-by-side type composite fiber capable of exerting a bulkiness effect more by manifesting crimps is preferable. Examples of this fiber include isophthalic acid and 2,
2-bis [4- (2-hydroxyethoxy) phenyl]
There is a side-by-side type polyester latent crimped yarn in which PET as a first component and PET as a second component are copolymerized with propane.

The melting point difference between the above-mentioned copolymerized polyester and PET is not particularly limited,
In order to stably fuse only the filaments of the deep dyeing part, the difference in melting point is preferably 10 to 100 ° C, particularly 20 to 50 ° C.

The fused false-twisted yarn of the present invention is deeply dyed and fused in the longitudinal direction of the yarn, and is not dyed and does not fuse with the focused portion,
It has alternating bulky parts. The length and ratio of the deep dyeing part and the light dyeing part are not particularly limited, but in order to obtain a good pattern effect, the length of the light dyeing part is 3
~ 70 cm, the ratio of this part to the entire yarn is 3 ~ 20
% Is preferable.

Further, it is necessary that a part of the filament of the deep dyeing part is fused. Since some filaments are fused together, multiple filaments are fused together to increase the rigidity of the yarn, and therefore the fabric obtained by weaving and knitting is given elasticity and stiffness. be able to.

Further, in the light dyeable portion and the bulky portion, no filament is fused, so that the crimp applied by false twisting is sufficiently exhibited and becomes bulky. As a result, the fabric obtained by weaving and knitting the fused false twisted yarn of the present invention is
Since the light dyeing part is bulky, the surface of the fabric becomes uneven,
It has a clear shade pattern effect and a favorable fancy effect.

Another feature of the fused false twisted yarn of the present invention is that, compared with the textured yarn described in the above-mentioned Japanese Patent Laid-Open No. 6-101131,
Since it is made of a material whose melting point is lower than that of PET by copolymerization, it is possible to set the false twisting temperature at which the yarns are fused to a low value, and thus the inter-mass spots during false twisting are greatly reduced. This is a point that can be done.

Next, the fused false-twisted yarn having the fancy effect of the present invention will be described with reference to the drawings.

FIG. 1 shows a fusion false twisted yarn of the present invention, and FIG. 2 shows a textured yarn having the same pattern effect as that of the present invention but fused over the entire length (see the above-mentioned Japanese Patent Laid-Open No. 6-101131). )
FIG.

In FIG. 1, a is a portion where most of the filaments are fused to form the deep dyeing portion c, and b is a portion where the filament is not fused and shows a bulky crimped form. Is the part that forms. As is clear from FIG. 1, the deep-dyeing portion C and the light-dyeing portion D have crimped forms that can be clearly distinguished.

On the other hand, in the processed yarn shown in FIG. 2, the portion where the filaments are fused is present over the entire length of the yarn, and has a similar fused form in the longitudinal direction of the yarn. Further, as is clear from FIG. 2, the deep-dyeing part e and the light-dyeing part have a shape that cannot be distinguished only by the crimped shape.

Next, an example of a method for producing the fused false twisted yarn having the fancy effect of the present invention will be described.

A highly oriented unstretched yarn whose main repeating unit is an ethylene terephthalate unit, other components are copolymerized, and at least a part of the surface of which is composed of a copolyester having a melting point lower than that of PET is used as a supply yarn, A liquid is intermittently applied to this yarn, heat treatment is continuously performed in a non-contact state, and further, simultaneous drawing and false-twisting process is performed to obtain the fused false-twisted yarn of the present invention. That is, since the liquid application part has been heat-treated only once during false twisting, it becomes a light dyeing and bulky part, and the liquid non-application part is melted by two heat treatments of non-contact heat treatment and false twisting. It becomes a deep dyeing part.

As the supply yarn, for example, PET obtained by copolymerizing 8 mol% of isophthalic acid and 5 mol% of 2,2-bis [4- (2-hydroxyethoxy) phenyl] propane was used as the first fiber.
Side-by-side type polyester latent crimped composite yarn with a second component of PET, PET (residual elongation 110%, melting point 220
℃), the heat treatment after intermittently applying the liquid, if the yarn speed is 100 m / min, the temperature is 160-220 ℃,
The overfeed rate is preferably 0 to 10%. The number of false twists during simultaneous drawing false twist is (25000 to 35000) / D
^1/2 (D is a yarn denier after false twisting) may be adopted, but the higher the false twist number, the greater the bulkiness of the light dyeing part. Further, the draw ratio is preferably 1.3 to 1.5,
The higher the magnification, the lower the degree of fusion. Further, the false twist temperature largely influences the degree of fusion, but the yarn to be the supply yarn in the present invention can be fused by changing the temperature of the non-contact heat treatment even if the false twist temperature is constant. Since the degree of adhesion can be adjusted, it is possible to fuse only the heat-treated portion (dark dyeing portion) by increasing the non-contact heat treatment temperature without raising the false twist temperature. Therefore, the false twist temperature is set as low as possible so that the light dyeing part will not be fused, and it is particularly preferable to adopt 120 to 180 ° C.

FIG. 3 is a schematic process diagram of the above-described manufacturing method example. In FIG. 3, the supply yarn 1 passes through the guide 2 and is intermittently brought into contact with the liquid application roller 5 by the intermittent liquid application device 4 between the feed roller 3 and the first delivery roller 7 to intermittently apply the liquid. After that, heat treatment is performed by the non-contact heater 6. Then, a false twisting heater 8 and a false twisting spindle 9 perform a simultaneous drawing and false twisting process between the first delivery roller 7 and the second delivery roller 10 to form the fused false twisted yarn of the present invention, and the winding roller 11 packages 12 Is wound up in.

[0025]

EXAMPLES Next, the present invention will be specifically described by way of examples.

The intrinsic viscosity [η] in the examples
Was measured at a temperature of 20 ° C using an equal weight mixed solvent of phenol and ethane tetrachloride.

Example 1, Comparative Example 1 PET having an intrinsic viscosity [η] of 0.50 was obtained by copolymerizing 8 mol% of isophthalic acid and 5 mol% of 2,2-bis [4- (2-hydroxyethoxy) phenyl] propane. A side-by-side type composite fiber 300d / 48f (residual elongation 110%, melting point 220 ° C) having a composite ratio of 1: 1 obtained by using PET having a first component and an intrinsic viscosity [η] of 0.68 as a second component was used as a supply yarn. According to the process shown in Fig. 3, water is intermittently applied in the lengthwise direction of the yarn to a length of 3 to 7 cm so as to be 12% of the whole yarn, then sent to the heat treatment process, and the heater temperature is 190 ° C. Heat treatment was performed at an overfeed rate of 0%. Continuing, false twist number 2175T /
M, a draw ratio of 1.306 times, and a false twisting false twisting process were performed at a false twisting temperature of 150 ° C.

On the other hand, for comparison, 300d / 48f of PET highly oriented undrawn yarn having a birefringence of 56 × 10 ⁻³ obtained by high speed spinning was
According to the process of FIG. 3, water is intermittently applied to the longitudinal direction of the yarn 3 to
It was attached to a length of 7 cm so that the ratio was 12% of the whole yarn, then sent to the heat treatment step, and heat treated at a heater temperature of 215 ° C and an overfeed rate of 1.1%. Continuing,
A false twisting process was performed at a false twist number of 2560 T / M, a draw ratio of 1.4 times, and a false twist temperature of 250 ° C.

Of the false-twisted yarns obtained, the yarn obtained in Example 1 had substantially no thick and thin spots, and a part of the filament of the deep-dyeing part was fused to give a light-dyeing property. The part was not fused and had a bulky morphology. On the other hand, in the yarn obtained in Comparative Example 1, a part of the filament is fused and the filaments are adhered to each other in both the deep dyeing part and the light dyeing part, and the entire yarn is It was a feeling of rigidity.

Using the two types of false-twisted yarns obtained as described above, woven fabrics each having a warp density of 70 yarns / 2.54 cm and a weft yarn density of 60 yarns / 2.54 cm and having a twill design of 2/2 were woven. Then, the obtained woven fabric was dyed with 2% owf of Sumikaron Navy Blue S-2GL (disperse dye manufactured by Sumitomo Chemical Co., Ltd.) according to a usual polyester dyeing method, and finished into a product.

Regarding the surface effect of the woven fabric after dyeing, the light blue pattern was effectively arranged on the blue background in both Example 1 and Comparative Example 1. However, the woven fabric of Example 1 was compared with Comparative Example 1 The product had a more uneven surface and had a clear fancy effect due to the clear shade pattern and the see-through portion.

[0032]

EFFECTS OF THE INVENTION By knitting or weaving the fused false-twisted yarn having the fancy effect of the present invention, the resulting fabric is synergistic with a clear shade pattern effect, a see-through effect of the pattern portion, and an uneven surface feeling effect. It is possible to add a fancy effect, and further, by fusing the deep-dyeing portion, the touch feeling is made like a strong twist, and it is possible to add firmness and elasticity.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a fused false-twisted yarn having a fancy effect of the present invention.

FIG. 2 is a schematic explanatory view of a conventional fused false-twisted yarn.

FIG. 3 is a schematic process drawing showing an example of a method for producing a fused false-twisted yarn having a fancy effect of the present invention.

[Explanation of symbols]

 (A) Location where most filaments are fused (b) Location where bulky crimp form is observed (c) Dark-dyeing area (d) Light-dyeing area (e) Dark-dyeing area (f) Light-dyeing area

Claims (1)

[Claims] 1. A deep dyeing in the longitudinal direction of a filament in which the main repeating unit is an ethylene terephthalate unit, and other components are copolymerized, and at least a part of the surface of which is composed of a copolyester having a melting point lower than that of polyethylene terephthalate. A false twisted yarn having alternating dyed parts and light dyed parts, wherein the filaments forming the yarn have no substantial thick and thin spots, and some of the filaments of the dark dyed part are fused. A fused false-twisted yarn having a fancy effect, which is characterized in that the light-dyeable portion does not fuse and is bulky.