JPH07331543A - Production of conjugate bulky crimp yarn - Google Patents

Abstract

PURPOSE:To provide a method for producing conjugate bulky crimp yarn composed of a yarn having non-rotating crimp shape and an uncrimped multifilament yarn and capable of giving the change of surface and soft touch feeling having volume feeling to a woven or knitted fabric. CONSTITUTION:A highly oriented and undrawn polyester yarn 1 having 0.02-0.08 birefringence DELTAn is heat-treated and the yarn is fed to a pushing device using a heating fluid to form crimp of the yarn. Then, the crimped yarn A is subjected to interlacing treatment with an uncrimped multifilament yarn B so that hot water shrinkage factor and breakage elongation of these yarns A and B satisfy the conditions (1) to (3) as shown below and then, the conjugate yarn after interlacing treatment is heat-treated. (1) The hot water shrinkage factor is <=5% in the yarn A and >=5% in the yarn B and (2) the difference (the yarn B-the yarn A) of hot water shrinkage factors is >=5% and (3) breakage elongation of the yarn B is <=50%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a non-twisted crimped yarn and a non-crimped multifilament yarn, and provides a woven or knitted fabric with a surface change and a soft and voluminous texture. The present invention relates to a method for producing a composite bulky crimped yarn that can be applied.

[0002]

2. Description of the Related Art As one of the methods for providing crimp to a polyester multifilament yarn, a heating fluid pushing method is well known. Most crimped yarns obtained by this heating fluid indentation method are thick yarns of several thousand denier or more,
It is often used for carpets and interior applications.

In recent years, a fine denier crimped yarn suitable for the field of clothing has been developed by the heated fluid indentation method. However, this crimped yarn has a rough crimped waveform as compared with false twisted yarn. In particular, in the case of polyester yarns, due to factors such as low crimp fastness, the crimp tends to be stretched against relatively low tension and weak ironing during knitting and weaving or in the preparation process.
There was a defect such as crimp disappearing.

Further, in the crimped yarn obtained by this heating fluid indentation method, the phases of crimps are not uniform among the filaments,
Although it exhibits a random crimp form, the effect of this random crimp is easily influenced by the texture and density of the fabric, and for example, the pile texture and the satin float.
It appears only in coarsely textured tissues, such as long textures, and in fabrics, knitted fabrics, or fabrics that have a higher density than usual, the surface changes and volume feeling obtained from this random crimped form I couldn't show it to the full.

As described above, the crimped yarn produced by the hot fluid indentation method is not sufficient for pursuing a feeling and an appearance corresponding to the recent diversification and sophistication in the field of clothing, and it is still sufficient to meet the demand. The reality is that no crimped yarn that can be used has appeared.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks, has a good processability without changing the form of the yarn in the weaving / knitting process, its preparation process, etc. It is a technical object to provide a method for producing a composite bulky crimped yarn capable of imparting a random surface change and a soft and voluminous texture to the cloth thus obtained.

[0007]

The present inventors have arrived at the present invention as a result of earnest research to solve the above-mentioned problems. That is, according to the present invention, a polyester highly oriented undrawn yarn having a birefringence Δn of 0.02 to 0.08 is heat-treated and then supplied to a heating fluid pushing device to form a crimped yarn A and a non-crimped multifilament. A method in which the yarn B is entangled and then the composite yarn after the entanglement treatment is heat treated, wherein the hot water shrinkage ratio and the breaking elongation of the yarns A and B supplied to the entanglement treatment are as follows.
The gist of the present invention is to provide a method for producing a composite bulky crimp yarn, which is characterized in that the conditions (1) to (3) are satisfied. (1) Hot water shrinkage ── Thread A: 5% or less Thread B: 5% or more (2) Difference in hot water shrinkage ── Thread B-Yarn A ≧ 5% (3) Elongation at break ──── Yarn B: 50% or less The hot water shrinkage and elongation at break are measured according to JIS L 1090.

The present invention will be described in detail below.

First, in the present invention, high-speed spinning (spinning speed 2500-
It is necessary to use a polyester highly oriented undrawn multifilament yarn having a birefringence index Δn of 0.02 to 0.08 obtained by (5,000 m / min) as a supply yarn for the crimped yarn A.
In the case of polyester highly oriented undrawn yarn having a birefringence index Δn of less than 0.02, which is the yarn A, when a heat treatment or a heating fluid indentation treatment is performed as in the present invention, a part of the filament is apt to be embrittled. Becomes unstable. On the other hand, the birefringence Δn is
When it exceeds 0.08, the orientation is too high and the internal structure of the yarn is stable, so that a high crimping and random crimp form cannot be obtained.

In the present invention, first, the polyester highly oriented undrawn yarn is heat treated. The purpose of this heat treatment is to heat the yarn uniformly macroscopically and nonuniformly microscopically so as to impart internal strain unevenness to the yarn. That is, the entire yarn is uniformly heated from the surroundings, and while maintaining the physical properties such as strength and elongation in the longitudinal direction of the yarn substantially constant, the filament group located on the surface layer of the multifilament yarn is One of the important points is to make the heat-receiving effect different among the filament groups located in the inner layer and to make the heat-receiving effect different between the surface portion and the inside of the single filament. By performing heat treatment so that the heat-receiving effect is different between filaments and within filaments, the randomness and phase randomness of the crimp size and direction during crimping in the subsequent heating fluid indentation process. It becomes possible to emphasize.

This heat treatment is performed by using a contact type heater or a non-contact type heater, but it is preferable to use the non-contact type heater which is free from stains of the heater due to the adhesion of oil etc. and is advantageous in terms of operability and maintenance. preferable.

The conditions of the heat treatment vary depending on the length of the heater, the yarn speed, etc., but for example, a non-contact type heater is used, and the heat treatment temperature is 450 to 600 ° C. and the heat treatment time is 0.01 to 0.
The range of 2 seconds is preferable. It is also preferable to heat treat the yarn in a slightly tensioned state, and draw ratio (DR)
The range of 1.05 to 1.8 times is preferable.

As described above, the heat treatment of the present invention causes a difference in the heat receiving effect between the filaments of the highly oriented undrawn yarn and within the filaments. By changing the heat treatment conditions, the crimp shape and phase can be changed. Can be arbitrarily formed. Furthermore, since the yarn openability is also improved, the crimping workability in the nozzle during the subsequent heating fluid pressing process is also improved.

In the present invention, the highly oriented undrawn yarn is subjected to the above-mentioned heat treatment and then supplied to a heating fluid pushing device to be crimped.

The heating fluid pushing device is divided into a jet nozzle portion, a depositing portion and a cooling portion. The filament is introduced into the jet nozzle in a relaxed state, and the filament is opened by a high-pressure heating fluid (hereinafter referred to as "hot air jet") that has a propulsive force in the same direction as the filament traveling direction, and the filament shrinks. While passing the jet nozzle, it passes through the jet nozzle at high speed. The yarn passing through the jet nozzle part rapidly stalls at the next accumulation part, and due to this stall, the combined action of the sudden loosening of the filament and the turbulent flow created by the jet jet works, and each filament sags. , Three-dimensional corrugated crimps are formed by being pushed into the deposition area with loops, entanglements, etc. occurring.

As described above, the yarn suddenly stalls in the depositing portion while causing transient phenomena such as fiber opening and heat shrinkage in the jet nozzle portion, and is further pushed at a high speed.
In addition to the fine crimps based on the internal structure change of the highly oriented undrawn yarn that has been heat-treated in the previous step, a complicated three-dimensional crimp form in which random coarse crimps are mixed is formed.

The relaxation rate in this heated fluid indenting zone is preferably 10% or more, and when the relaxation rate is less than 10%,
It is difficult to obtain a sufficient crimped form because the slack necessary for heat shrinkage and buckling is not given. This relaxation rate may be appropriately set depending on the thermal contraction rate of the yarn, the propulsive force of the yarn by the hot air jet, the yarn speed, the heating temperature, and the like.

The term "relaxation rate" as used herein refers to the ratio of the difference between the supply speed and the take-up speed to the take-up speed, expressed as a percentage.

Further, the temperature and the air pressure of the hot air jet are not particularly limited and may be appropriately set according to the type and fineness of the supplied yarns. According to the study by the present inventors, Heating temperature is 130-240 ℃, air pressure is
It is preferably in the range of 1.0 to 5.0 kg / cm ² .

As described above, the highly oriented undrawn yarn after heat treatment is pushed into the deposition chamber in a relaxed state with almost no tension by the high-pressure heating fluid, so that sufficient heat treatment and relaxation treatment are given, The yarn A has a low heat shrinkage rate of 5% or less and a complicated three-dimensional corrugated crimp.

Next, the yarn A and the non-crimped multifilament yarn B are entangled. When this entanglement treatment is applied, the yarn A and the yarn B are subjected to the above (1), (2). ), (3) must be satisfied.

That is, the hot water shrinkage of the yarn A is set to 5% or less. If the hot water shrinkage ratio of the yarn A exceeds 5%, the random crimp obtained by the hot fluid indentation process cannot be sufficiently exhibited. On the other hand, the yarn B must have a hot water shrinkage of 5% or more and a breaking elongation of 50% or less. If the hot water shrinkage ratio of the yarn B is less than 5% or the difference between the hot water shrinkage ratios of the yarn A and the yarn B is less than 5%, the yarn A will not be removed even if the heat treatment is performed in the subsequent process. Since it is difficult to locate it on the outer layer side of B, it becomes impossible to fully exert the effect of the random corrugation of the yarn A, and a soft and bulky feel cannot be obtained. Further, by setting the breaking elongation of the yarn B to 50% or less, morphological change does not occur due to external force in the weaving / knitting process and its preparation process, and stable operability can be obtained.

As a method of confounding processing in the present invention,
An interlacing process using an interlace nozzle or an entangling process using a Taslan nozzle can be adopted. The relaxation rate in the confounding treatment zone is preferably 1 to 20%.

In the present invention, the composite yarn obtained by entanglement of the yarn A and the yarn B is heat-treated. As the method of this heat treatment, there can be adopted a method in which the entangled composite yarn is in a relaxed state, or a method in which the composite yarn is woven or knitted and then in a cloth state at the time of dyeing.

In the composite bulky crimped yarn obtained in the present invention, the yarn B having a large hot water shrinkage shrinks to form the core portion, and the yarn A is positioned on the outer layer side with almost no shrinkage. The yarn A has a form in which a sheath portion is formed while maintaining a random crimped form. This composite yarn has a flat shape in which the yarn B forming the core has a low elongation and no crimp, and thus is crimp-robust against external force during knitting and weaving or in its preparation process. The yarn A, which has low properties, is not tensioned and has a stable form.

The polyester constituting the yarn A in the present invention is a polymer having an ester bond in the molecular chain and includes a homopolymer represented by polyethylene terephthalate and a copolymer or blend polymer thereof. The non-crimped multifilament yarn B may be any multifilament yarn composed of a polymer such as polyester or polyamide and having a low elongation and a high shrinkage property.

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a schematic process diagram showing the steps up to the confounding process of one embodiment of the present invention. In FIG. 1, the polyester highly oriented undrawn yarn 1 passes through a guide 8 and is fed by a first feed roller 2, a heater 3, a second feed roller 4, a heating fluid pushing device (jet nozzle 5, deposition section 6, cooling section 7). And is guided to the delivery roller 9. At that time, the yarn 1 is
The first feed roller 2 and the second feed roller 4 are heat-treated so as to cause internal distortion, and then are relaxed between the second feed roller 4 and the delivery roller 9 and, at the same time, the jet nozzle 5 and the deposition are accumulated. The crimp is applied in the portion 6 and the crimp is fixed in the cooling portion 7 to form the crimped yarn A.

Subsequently, the yarn A and the non-crimped yarn B supplied by the delivery roller 9 through the guide 15 are entangled by the entanglement processing device 10 between the delivery roller 9 and the take-up roller 11. As a composite yarn, which is wound up on the package 13 by the winding roller 12. The composite yarn wound up in the package 13 is subjected to heat treatment in a yarn state or a state of a cloth after weaving and knitting, and becomes a target composite bulky crimped yarn.

FIG. 2 is a schematic view showing an embodiment of the composite bulky crimped yarn obtained by the present invention. In FIG. 2, the yarn A is located on the outer layer side and has a random crimped form in which fine crimps and coarse crimps are mixed. On the other hand, the yarn B constitutes a core portion, and the entangled portion 14 between the yarn A and the yarn B has a form intermittently formed in the longitudinal direction.

[0031]

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

Examples 1-4, Comparative Examples 1-2 Polyethylene terephthalate (PET) highly oriented undrawn yarns 110d / 7 with various birefringences Δn as the supply yarns for the yarn A.
Using 2f as a non-crimped multifilament yarn B,
Using a 75d / 36f PET drawn yarn or a 70d / 24f nylon 6 drawn yarn, heat treatment, crimping, and entanglement treatment were performed under the conditions shown in Table 1 according to the process shown in FIG. In Example 2, the yarn B was not supplied to the delivery roller 9 but was directly supplied to the entanglement processing device 10 from another roller.

[0033]

[Table 1]

In Table 1, the "of" rate is the relaxation rate, and the heat yield is the hot water shrinkage rate.

Next, the obtained composite yarn was cylindrically knitted, dyed by a conventional method, and then unknitted. Table 2 shows the properties of the obtained composite bulky crimped yarn.

[0036]

[Table 2]

As is clear from Table 2, the crimped yarns obtained in Examples 1 to 4 exhibited a bulky and random crimped form excellent in form fastness. On the other hand, the crimped yarns obtained in Comparative Examples 1 and 2 were poor in random crimps, and the fabrics obtained from the crimped yarns were poor in softness and volume.

The composite yarn obtained in Example 1 was used as a warp yarn and a weft yarn, and woven into a 2/2 twill with a warp density of 75 yarns / 2.54 cm and a weft yarn density of 70 yarns / 2.54 cm. A 20-gauge double-sided knitting machine was used to knit into a double-sided knit with a tissue mock Milano rib and a condition of 35 courses / 2.54 cm. The obtained fabrics did not have a crimped form settling due to ironing, and both weavability and knitability were good.

Then, the obtained woven fabric and knitted fabric were subjected to a usual polyester dyeing treatment, and a bulky and soft-textured fabric having a random crimp of irregular shape was obtained.

Example 5 The entangled composite yarn obtained in Example 1 was heat-treated at a relaxation rate of 15% and a temperature of 250 ° C. and wound after the entanglement treatment. The obtained composite bulky crimped yarn was one in which random crimps were developed, bulky, and soft texture.

[0041]

EFFECTS OF THE INVENTION According to the present invention, internal crimping of polyester highly oriented undrawn yarn, heat shrinkage characteristics, random crimping due to indentation buckling by heating fluid, and entanglement of non-crimped multifilament yarns. By adding and combining characteristics and the like, it is possible to produce a bulky composite crimped yarn that is soft and has a bulky texture and exhibits a random crimped form, while having excellent crimp form fastness. .

[Brief description of drawings]

FIG. 1 is a schematic process diagram showing the steps up to the confounding process of an embodiment of the present invention.

FIG. 2 is a schematic view showing one embodiment of a composite bulky crimped yarn obtained by the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polyester highly oriented undrawn yarn 3 Heater 5 Jet nozzle 6 Deposition part 7 Cooling part 10 Entanglement treatment device 13 Package 14 Entanglement part A Thread with crimp B Non-crimped multifilament thread

Claims (1)

[Claims] 1. A highly-oriented polyester unoriented yarn having a birefringence Δn of 0.02 to 0.08, which is heat-treated and then fed to a heating fluid pushing device to form a crimp, and a non-crimped multifilament yarn. A method of entanglement with a yarn B and then heat-treating the composite yarn after the entanglement treatment, wherein the hot water shrinkage ratio and the breaking elongation of the yarns A and B supplied for the entanglement treatment are as follows (1) to (3)
1. A method for producing a composite bulky crimped yarn, characterized by satisfying the above condition. (1) Hot water shrinkage ── Thread A: 5% or less Thread B: 5% or more (2) Difference in hot water shrinkage ── Thread B-Yarn A ≧ 5% (3) Elongation at break ──── Thread B: 50% or less