JP2000034619A - Production of heteroshrinkable polyester combined filament yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a heteroshrinkable combined polyester filament yarn, in which two kinds of yarns having sufficient shrinkage difference from each other are combined in a state of filament in a single process. SOLUTION: This heteroshrinkable combined polyester filament yarn is produced by the following steps: (1) melt-spinning polyester having 0.55-0.80 specific viscosity to form two yarns, followed by cooling and solidifying them; (2) gathering and bundling one yarn A, giving it lubricant taking it up with the first roller 5 and making it pass through a heating unit 7 inside which hot gas is fed to heat-treat the yarn A; (3) making the other yarn B pass through a tubular heating unit 3 to heat-treat the yarn B without gathering and bundling it, followed by cooling it and then by gathering and bundling it to give it lubricant, by taking it up with the second roller 6; (4) commingling both yarns A and B with each other, taking up the combined filament yarn through the third roller 8, interlacing it and winding it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polyester fiber with different shrinkage in which one type of polyester fiber is produced by mixing two types of polyester fibers having different shrinkage characteristics. is there.

[0002]

2. Description of the Related Art Polyester fibers are widely used as clothing fibers. In order to give a swelling feeling and a soft feeling when made into a fabric, a polyester fiber obtained by mixing two or more fiber groups having different heat shrinkage rates is used. A yarn is used. As a method of obtaining such a mixed fiber, a method of separately spinning a group of fibers having different heat shrinkage rates and performing a mixed fiber processing on the wound yarn in a separate step is employed. It was disadvantageous in terms of manufacturing cost.

As a remedy, there has been proposed a method in which various kinds of fiber groups are simultaneously spun in a spinning step, mixed, and then wound. For example, Japanese Patent Application Laid-Open No. 2-127514 proposes a method in which two kinds of fiber groups having different take-up speeds are finally supplied to a roller having the same speed, and then mixed and entangled, and then wound. However, in this method, although a mixed fiber can be obtained in one step, the shrinkage is limited by the spinning speed, and there is a limit in controlling the difference in shrinkage between the two types of fiber groups. No yarn could be obtained.

In Japanese Patent Application Laid-Open No. Hei 2-293412, an aqueous solution is applied to a part of the fiber group immediately after melt-spinning and quenched to produce a difference in shrinkage, thereby producing a different shrinkage mixed fiber. A method has been proposed. Although this method can be applied to ordinary spinning equipment, it has been difficult to stably perform spinning because an aqueous solution is applied to the running yarn before solidification due to high temperature.

Further, as a method for obtaining a mixed fiber in one step, a method has been proposed in which a heating device is provided between a spinneret and a take-off roller, and the once cooled yarn is heat-treated to control its physical properties. First, JP-A-7-26435 discloses that
A method using two types of heating devices having different calibers is described. In this method, the obtained mixed fiber can increase the difference in shrinkage in boiling water, but cannot increase the heat shrinkage stress of the highly shrinkable yarn. It is not possible to develop a contraction force that exceeds the constraint,
A sufficient swelling feeling could not be given to the fabric.

Further, Japanese Patent Application Laid-Open No. 7-300732 describes a method in which a heating cylinder is used as a heat treatment apparatus, and the physical properties between yarns are made different by making the lengths different. However, the difference in heat shrinkage characteristics of the different shrinkage mixed fiber obtained by this method could not be sufficiently increased. In this way, a different shrinkage mixed fiber yarn having a sufficiently large heat shrinkage property equivalent to that obtained by a separate fiber mixing process in a separate process and capable of giving a good swelling feeling and softness when made into a fabric can be obtained in one step. The way to get it is not established.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and a yarn having a sufficient difference in shrinkage is mixed to obtain a good swelling feeling when formed into a fabric.
An object of the present invention is to provide a production method capable of obtaining a polyester hetero-shrinkage mixed fiber yarn capable of giving a soft feeling in one step.

[0008]

Means for Solving the Problems The present inventors have studied to solve the above-mentioned problems, and as a result, have reached the present invention. That is, in the present invention, two yarns made of polyester having an intrinsic viscosity of 0.55 to 0.80 are melt-spun and cooled and solidified. Then, one of the yarns A is bundled to give an oil agent, After being picked up by the roller at the speed V1, the heat is passed through a heating device for supplying the heating gas therein and heat-treated. The other yarn B is passed through a cylindrical heating device without being bundled and heat-treated. After cooling, it is bundled to give an oil agent, taken up by a roller having a surface speed V2, and then both yarns are combined to form a surface speed V3.
The present invention provides a method for producing a polyester hetero-shrinkage mixed fiber yarn, characterized in that the yarn is taken up through a roller, subjected to entanglement treatment, and then wound up. However, V1 = 3000 to 4000 m / min V2 = V3 × 0.50 to V3 × 0.70 m / min V3 = V1 × 0.90 to V1 × 0.95 m / min

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic process diagram showing one embodiment of the present invention. The present invention relates to a method for producing a melt-spun yarn (yarn A and yarn B) under different conditions by stretching and heat-treating the yarns, then tangling the yarns, winding them up, and winding them up. This is a method for producing yarn. In addition, yarn A and yarn B
1, as shown in FIG. 1, may be obtained by spinning from different spinnerets or by splitting a yarn spun from one spinneret.

First, yarns A and B are melt-spun from different spinnerets 1A and 1B, respectively, and cooled and solidified by a cooling air blowing device 2. Next, the yarn A is bundled at the same time as the application of the oil agent by the oil agent application device 4, is taken up by the first roller 5, and then passes through a heating device 7 for supplying a heated gas to the inside to be heat-treated. On the other hand, the yarn B is not bundled,
After passing through the inside of the cylindrical heating device 3 for heat treatment, the oil is applied by the oil applying device 4 and the bundle is converged at the same time as the oil is applied, and is taken up by the second roller 6.

Then, the yarn A passing through the heating device 7 and the yarn B passing through the second roller 6 are combined and taken up by the third roller 8, and the entanglement is imparted to all the yarns by the entanglement imparting device 9. ,
The film is wound by the winding device 10. In this way, it is possible to obtain a different shrinkage mixed fiber in which the yarn A having a low heat shrinkage and the yarn B having a high heat shrinkage are mixed.

In the manufacturing method of the present invention, the first roller 5
Is required to be 3000 to 4000 m / min. By taking up the yarn A at a speed in this range, when the yarn A is supplied to the heating device 7, it is possible to obtain a yarn that can be sufficiently subjected to relaxation heat treatment. V1 is 3000m /
If it is lower than minutes, not only the relaxation heat treatment cannot be performed sufficiently,
Since the strength of the yarn becomes too low, the yarn breaks in the heating device 7. On the other hand, when V1 is higher than 4000 m / min, the orientation becomes too high, so that the heat shrinkage cannot be sufficiently reduced even if the relaxation heat treatment is performed.

Although the surface temperature of the first roller 5 is not particularly limited, in order to increase the effect of the relaxation heat treatment by the heating device, it is necessary to excessively apply heat to the yarn with the first roller to increase the crystallinity. Because it is not preferable, it is preferable to set the temperature to about room temperature to 100 ° C.

The surface speed V2 of the second roller 6 is determined by the ratio of the surface speed V3 of the third roller 8 to the surface speed V3.
It is necessary to be 50 to V3 × 0.70 m / min.
By setting V2 to this range in the ratio with V3,
The heat shrinkage of the yarn B can be sufficiently increased. When V2 is lower than this range, the elongation of the yarn B becomes too low, and a single yarn break occurs between the second and third rollers. On the other hand, when V2 is higher than this range, the orientation of the yarn B is changed. Since it does not become sufficiently high, it is not possible to obtain a yarn having a high heat shrinkage.

The surface temperature of the second roller 6 is 70-1.
The temperature is preferably set to 00 ° C. If the surface temperature is lower than 70 ° C., the tension between the second and third rollers is large, so that single yarn breakage tends to occur. If the surface temperature is higher than 100 ° C., crystallization is promoted, and the heat shrinkage is increased. It becomes difficult.

The surface speed V3 of the third roller 8 is determined by the ratio to V1, and is expressed as V1.times.0.90 to V1.times.0.95 m.
/ Min. By setting the ratio between V3 and V1 within this range, the heat shrinkage of the yarn A can be sufficiently reduced. If V3 is below this range, the first and third
The tension of the yarn A between the rollers is too low, making it difficult to pass through the heating device. If V3 is higher than this range, the thermal shrinkage of the yarn A cannot be sufficiently reduced.

The surface temperature of the third roller is 70 to 12
The temperature is preferably set to 0 ° C. If the surface temperature is lower than 70 ° C., the shrinkage of the yarn B is high due to the high shrinkage stress of the yarn B, and the winding form at the time of winding is poor. If the winding amount is large, the paper tube may not be able to be removed from the winding device. When the surface temperature is higher than 120 ° C., crystallization of the yarn B is promoted, and the heat shrinkage decreases,
Not preferred.

Heating device 7 for heat treatment by passing through yarn A
The heating gas is supplied to the inside, and the gas supply direction is preferably opposite to the running direction of the yarn. And the gas temperature is preferably 200 to 500 ° C.
By passing the yarn A through the heated gas flowing backward,
It is possible to perform a relaxation heat treatment with a large relaxation rate, and as a result, it is possible to obtain a yarn A having a low heat shrinkage rate. If the temperature of the heated gas is lower than 200 ° C., the yarn A
It is difficult to sufficiently reduce the heat shrinkage of the yarn.

Further, it is preferable that the inner wall temperature of the cylindrical heating device 3 for heat-treating the yarn B is set to 150 to 250 ° C. The yarn B is placed in the cylindrical heating device whose inner wall temperature is in this range.
When the inner wall temperature is lower than 150 ° C., the heat shrinkage stress decreases, and the heat shrinkage stress decreases.
If it is higher than 50 ° C, the yarn will fuse when it comes into contact with the wall surface,
Not preferred.

The polyesters of the yarns A and B need to have an intrinsic viscosity in the range of 0.55 to 0.80. If the intrinsic viscosity is lower than this range, the heat shrinkage of the yarn B cannot be sufficiently increased, and if the intrinsic viscosity is higher than this range, the heat shrinkage of the yarn A cannot be lowered. Then, it is preferable that the intrinsic viscosity of the yarn B to be a highly shrinkable yarn is higher than the intrinsic viscosity of the yarn A by 0.05 or more.

As the polyester of the yarns A and B, those mainly composed of polyethylene terephthalate (PET) are preferably used. Although the yarns A and B may be made of the same type of polyester, in order to further increase the difference in shrinkage between the yarns, the yarns A and B are made of two types of different polyesters. Yarn B to be shrinkable yarn
Containing at least 5 mol% of a copolymer component of polyester
T is preferable.

The copolymerization components include isophthalic acid, adipic acid, sebacic acid, 2,6-naphthalenedicarboxylic acid,
4-cyclohexanedicarboxylic acid, 1,4-butanediol,
Neopentyl glycol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, and the like can be used. Of these, isophthalic acid is preferred, and copolymerization at the time of polymerization is preferred. Further, another polyester such as polybutylene terephthalate (PBT) may be melt-blended in an extruder.

The method of the present invention can be applied to yarns of various brands.
3.0d, the single yarn fineness of the yarn B is set in the range of 2.0 to 4.5d, and the number of each filament is set to 10 to 1
Preferably, the number is 00.

As described above, the different shrinkage mixed fiber obtained by the production method of the present invention has shrinkage characteristic values (boiling water shrinkage ratio, heat shrinkage stress) of low shrinkage yarn A and high shrinkage yarn B. , Initial elastic modulus) have the following values. Yarn A: boiling water shrinkage -3 to 5%, heat shrinkage stress 0.03 to
0.22 g / d, initial modulus of elasticity 40 to 70 g / d Yarn B: boiling water shrinkage 20 to 40%, heat shrinkage 0.60
-0.75 g / d, initial elastic modulus 80-120 g / d As described above, the different shrinkage mixed fiber obtained in the present invention has a sufficient difference in shrinkage ratio and the heat shrinkage of the highly shrinkable yarn B. Since it is a hetero-shrink mixed fiber having a large stress, by performing heat treatment, a fine loop having a soft texture is developed on the surface, and the mixed fiber can give a swelling feeling and a soft feeling to the fabric.

[0025]

The present invention will be described below in more detail with reference to examples. In addition, the measuring method of the characteristic value in this invention is as follows. (A) Boiling water shrinkage ratio The yarn was formed into a loop of 50 cm, an initial load of 1/30 g / d was applied to determine the length A, then freed, immersed in boiling water for 15 minutes, air-dried, and dried again. / 30g / d
Was applied to obtain the length B, which was calculated by the following equation. Boiling water shrinkage rate (%) = [(AB) / A] × 100 (b) Heat shrinkage stress Using a KE-2 type heat shrinkage stress measuring device manufactured by Kanebo Engineering Co., Ltd., a 16 cm long sample is looped to 8 cm.
The measurement was performed at an initial load of 1/30 g / d and a heating rate of 100 ° C./min. (C) Initial elastic modulus Measured according to JIS L 1013 and calculated from the slope of the load extension curve.

Examples 1 to 3 and Comparative Examples 1 to 6 PET (component A) having an intrinsic viscosity of 0.68 and an intrinsic viscosity of 0.7
PET (B component) copolymerized with 8 mol% of isophthalic acid of 5
Are supplied to an extruder-type melt spinning machine and melted at a spinning temperature of 290 ° C., and the A component is fed through a spinning hole having a diameter of 0.18 mm.
Spinning was carried out from a spinneret having 72 spinnerets, and the B component was spun from a spinneret having 18 spinnerets having a diameter of 0.30 mm, and the spinning was carried out according to the schematic process diagram shown in FIG. The yarns A and B are cooled and solidified by blowing cooling air at 15 ° C., and the yarn A is bundled at the same time as the spinning oil agent is applied.
It was taken up by a first roller at 0 ° C. and heat-treated by passing it through a hot-air heating device having a length of 80 cm in which 300 ° C. heated air flows at a wind speed of 600 m / min in a direction opposite to the running direction of the yarn.
Then, after passing the yarn B through a cylindrical heating device having an inner wall temperature of 200 ° C. and an effective heating length of 130 cm, the yarn B is naturally cooled, and the spinning oil is applied and bundled at the same time. The sheet was picked up by a second roller having a surface temperature of 80 ° C. Subsequently, the yarns A and B are combined, the yarns A and B are taken up by a third roller having a surface speed shown in Table 1, mixed, and entangled by an entanglement imparting device. The yarn is wound up by a take-up device at a take-up speed, and a different shrinkage blend comprising 72d / 72f (yarn A: single yarn fineness 1.0d) and 72d / 18f (yarn B: single yarn fineness 4.0d). Thread (144d / 90f)
I got Table 1 shows the measurement results of the physical properties of the obtained fibers.

Comparative Example 7 Except that the heat treatment of the yarn A was not performed by the hot air heating device,
Performed in the same manner as in Example 1. Table 1 shows the measurement results of the physical properties of the obtained fibers.

Comparative Example 8 Except that the heat treatment of the yarn B was not performed by the cylindrical heating device,
Performed in the same manner as in Example 1. Table 1 shows the measurement results of the physical properties of the obtained fibers.

[0029]

[Table 1]

As is clear from Table 1, in the fibers obtained in Examples 1 to 3, all of the yarn A had lower boiling water shrinkage ratio, heat shrinkage stress, and initial elastic modulus than the yarn B, indicating that the yarn A had sufficient strength. It is a different shrinkage mixed fiber having a difference in heat shrinkage rate, and when it is made into a fabric, a sufficient swelling feeling can be given. On the other hand, in Comparative Example 1, the first roller speed was too low, so that the yarn A had low orientation, and the yarn was fused in the hot air heating device. Comparative Example 2
In the case of No. 1, since the first roller speed was too high, the yarn A was highly oriented, the shrinkage ratio of boiling water was increased, and a favorable hetero-shrinkage mixed fiber could not be obtained. In Comparative Example 3, since the speed ratio between the second roller and the third roller was too large, the single yarn of the yarn B was cut between the rollers. In Comparative Example 4, since the speed ratio between the second roller and the third roller was too small, the boiling water shrinkage of the yarn B was low. In Comparative Example 5, since the speed ratio between the first roller and the third roller was too large, the tension was too low, and the yarn A could not be taken up by the third roller. In Comparative Example 6, since the speed ratio of the first roller and the third roller was small and the relaxation rate was insufficient, the boiling water shrinkage rate of the yarn A was high, and a good hetero-shrinkage mixed fiber could not be obtained. In Comparative Example 7, since the yarn A was not heat-treated by the hot air heating device, the yarn A could not be subjected to the relaxation treatment corresponding to the speed ratio of the first roller and the third roller, and the yarn A was taken up by the third roller. Could not. In Comparative Example 8, since the yarn B was not heat-treated by the cylindrical heating device,
The orientation could not be sufficiently increased, and the boiling water shrinkage rate of the yarn B was low.

[0031]

According to the present invention, when a yarn having a sufficient difference in shrinkage is mixed and subjected to a heat treatment, a soft loop is developed on the surface, and a good swelling feeling and a soft A polyester hetero-shrinkage mixed fiber that can give a feeling can be produced in one step with high productivity.

[Brief description of the drawings]

FIG. 1 is a schematic process chart showing one embodiment of the production method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spinneret 2 Cooling air blowing device 3 Cylindrical heating device 4 Oil agent application device 5 First roller 6 Second roller 7 Heating device 8 Third roller 9 Entangling application device 10 Winding device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D02J 1/00 D02J 1/00 K

Claims (3)

[Claims] 1. Two yarns made of polyester having an intrinsic viscosity of 0.55 to 0.80 are melt-spun and cooled and solidified. Then, one of the yarns A is bundled to give an oil agent, and the surface speed is increased. V
After being picked up by one roller, heat treatment is performed by passing through a heating device that supplies a heated gas to the inside, and the other yarn B is passed through a cylindrical heating device without being bundled and heat-treated. After cooling, it is bundled and applied with an oil agent, taken up by a roller having a surface speed of V2, then both yarns are combined, taken up via a roller having a surface speed of V3, subjected to entanglement treatment, and then wound up. A method for producing a polyester different shrinkage mixed fiber yarn, characterized in that: However, V1 = 3000 to 4000 m / min V2 = V3 × 0.50 to V3 × 0.70 m / min V3 = V1 × 0.90 to V1 × 0.95 m / min 2. The method for producing a polyester hetero-shrinkage mixed fiber yarn according to claim 1, wherein the supply direction of the gas in the heating device for heat treatment by passing the yarn A is opposite to the running direction of the yarn. 3. The yarns A and B are made of different polyesters, respectively.
The method for producing a polyester different shrinkage mixed fiber yarn according to claim 1, comprising polyethylene terephthalate containing the above.