JP2000170044A - Production of composite false-twisted yarn and false- twisting device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a composite false-twisted yarn having a shrinkage difference between component yarns, and to provide a false- twisting device suitable for the method. SOLUTION: This method for producing a composite false-twisted yarn comprises winding at least one of yarns on a rotary heater 3 to thermally treat the yarn, doubling at least two the yarns having a temperature difference therebetween and then false-twisting the doubled yarns wherein the yarn Yb on the low temperature side is thermally treated with the yarn Ya on the high temperature side. Therein, the yarn Ya on the high temperature side is substantially not false-twisted just before doubled with the yarn Yb on the low temperature side. The false-twisting device has at least feed rollers 2, a rotary heater 3, a false-twisting rotator 5 and draw roller 6 in the order for traveling the yarns. Therein, a doubling guide 4 is disposed between the rotary heater 3 and the false-twisting rotator 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for performing a composite stretch false twist and a false twist processing apparatus suitable for performing the composite stretch false twist.

[0002]

2. Description of the Related Art A composite false twisted yarn using a synthetic fiber is generally heated at a high temperature in a twisting region to sufficiently heat-set a twist form, and therefore generally has a high crimp. For this reason, the false twist device also includes a dry heat heater having a length (about 1 to 2 m) according to the processing speed and fineness, or a so-called high-temperature short heater.

On the other hand, Japanese Patent Application Laid-Open No. Hei 8-120533 proposes a false twisting method and a false twisting device using a rotary heating element as a heating device. it can. However, composite false twisting is performed on a single yarn or on two or more aligned yarns.
A heat receiving difference cannot be provided between the yarns, and a composite false twisted yarn having a difference in shrinkage cannot be obtained.

Further, Japanese Patent Application Laid-Open No. 9-273038 proposes a method for producing a composite false twisted yarn using a rotary heating body, which can impart a crimp difference between the yarns.
However, similarly to the above-mentioned Japanese Patent Application Laid-Open Publication No. H06-27138, since there is no difference in heat reception between the yarns, a difference in shrinkage between the yarns cannot be provided.

[0005] Further, as a common problem of the above-mentioned Japanese Patent Laid-Open Publication, since the false twist reaches the rotary heating element, the running of the yarn on the rotary heating element becomes unstable without the nip roller attached to the rotary heating element, and the yarn becomes unsteady. In addition to the inability to process, the rotating heating element and the nip roller were worn due to the rotation of the yarn, causing a change with time.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method for producing a composite false twisted yarn having a difference in heat treatment temperature and thereby a difference in shrinkage. And to provide a false twisting device suitable for it.

[0007]

Means for Solving the Problems A method for producing a composite false twist yarn and a false twist processing apparatus according to the present invention have the following configurations.

[0008] That is, at least one yarn is wound around a rotary heating body and subjected to heat treatment to combine at least two yarns having a temperature difference therebetween, and the twisting operation of false twisting causes a high temperature side to be twisted. In the false false twisting in which the low temperature side yarn is subjected to heat treatment on the low temperature side yarn, the high temperature side yarn is in a state in which substantially no false twist is contained until immediately before the low temperature side yarn merges. It is a manufacturing method of.

In a false twisting apparatus comprising at least a feed roller, a rotary heating element, a false twist rotor, and a draw roller in the order in which the yarn travels, a junction is formed between the rotary heating element and the false twist rotor. This is a false twisting machine in which a guide is installed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the method for producing false twisted yarn of the present invention, at least one yarn is wound around a rotary heating body and subjected to a heat treatment to provide at least two yarns having a temperature difference from each other.
In the draw false twist in which the yarns on the high temperature side are heat-treated by twisting the yarns on the high temperature side by the twisting action of the false yarns,
The yarn on the high temperature side is in a state in which substantially no false twist is contained until just before the yarn on the high temperature side merges with the yarn on the low temperature side.

That is, as described in the section of the prior art, when a rotary heating element is used as a heating device in the method of manufacturing a composite false twist, the rotary heating element is used to prevent the false twist from climbing on the rotary heating element. Needed a nip roller to accompany it.

On the other hand, in the present invention, since the twisting from the false twist is not substantially climbed on the rotary heating body while the composite false twisting is performed, the thread processing is stabilized, and the nip roller as described above is required. do not do. In addition, the rotating heating element by twisting,
Since abrasion of the nip roller is not caused, it is possible to reduce a change in thread quality due to a change over time and a cost required for roller replacement. Here, the state in which the false twist is not substantially contained means that the nip roller is rotated along with the rotary heating body, and the yarn is formed on the rotary heating body without installing a rotation guide or the like for preventing twisting. Refers to the situation where stable processing can be performed without showing unstable behavior. In addition, the term “immediately before merging” specifically refers to an upstream of the merging guide.

The principle that the twist is not substantially transmitted to the rotary heating element will be described below. The high-temperature side yarn is more easily drawn than the low-temperature side yarn and is drawn before merging, while the low-temperature side yarn is only slightly drawn before merging, and after the merging. Start stretching. Therefore, the yarns on the high temperature side merge with the yarns on the low temperature side so as to substantially cover the yarns due to the difference in yarn speed at the junction. Therefore, the false twist is performed on the low-temperature side yarn, but is not performed on the high-temperature side yarn.

In order to prevent twisting of the yarn on the high-temperature side as described above, the yarn temperature, the polymer constituting the yarn, the fineness composition between the yarns and the residual elongation depend on the temperature difference between the yarns. .

It is preferable that the temperature difference between the yarns is 5 ° C. or more, and the yarn on the high temperature side is heated to Tg or more. Although there is no problem even if the low-temperature side yarn is heated, it is preferable that the low-temperature side yarn is heated to Tg or less, and it is more preferable that the low-temperature side yarn is at room temperature.

Although the size of the fineness cannot be generally described, the fineness of the raw yarn on the high temperature side is preferably within twice the temperature on the low temperature side, more preferably not exceeding the fineness on the low temperature side.

The polymer constituting the yarn is not particularly limited as long as it is a thermoplastic polymer. Examples of preferred polymers include polyester fibers, polyamide fibers, polyvinyl alcohol fibers, polyvinyl chloride fibers, and polyvinyl chloride fibers. Vinylidene fiber, polypropylene fiber, cellulosic fiber, polylactic acid fiber, etc. can be used alone or in combination of two or more. Of course, it is not limited to the fiber shape of the fiber, for example, the fineness, the number of filaments, the cross-sectional shape, the dyeing properties, the gloss, and the presence or absence of twist.

More preferable polymers include polyester-based and polyamide-based polymers, and it is particularly preferable to use polyester from the viewpoint of shrinkage characteristics. As used herein, the polyester is preferably a polyethylene terephthalate-based polymer containing 80% or more ethylene terephthalate units. This ethylene terephthalate has
As copolymerization components, for example, dibasic acids such as adipic acid, sebacic acid, isophthalic acid, diphenyldicarboxylic acid and naphthalenedicarboxylic acid, oxyacids such as oxybenzoic acid and glycols such as diethylene glycol, propylene glycol and polyethylene glycol, 5-sodium One or more of sulfoisophthalic acid and the like can be copolymerized. Matting agents such as titanium oxide, fine pore-forming agents such as kaolinite, antistatic agents and the like may be added to these polyesters in small amounts.

The cross-sectional shape of the filament constituting the composite textured yarn of the present invention can be any of a round cross section, a multilobal cross section, a polygonal cross section, a flat cross section, a hollow cross section, and any other specially shaped cross section. A combination may be used.

There is no particular limitation on the residual elongation as long as it can withstand stretching, but unstretched yarn is preferably used, and particularly highly oriented unstretched yarn (so-called POY) is preferably used.

It is also preferable that the yarn on the high temperature side is drawn between the feed roller and the rotary heating body to positively impart a difference in the supply speed of the yarn at the junction.
There are no restrictions other than having a temperature difference between the yarns (fineness composition, polymer, etc.).

The composite false twisted yarn produced by the production method of the present invention has a gentle crimped form and a heat treatment temperature difference between the yarns because heating and twisting are separated. Therefore, there is a difference in shrinkage between the yarns. For example,
By using two yarns of polyester POY as the original yarn and selecting appropriate processing conditions, both have a low false twist crimp, and the low-temperature side yarn has a higher shrinkage rate than the high-temperature side yarn. A composite stretched false twisted yarn having a birefringence range between and in the single yarn longitudinal direction. Therefore, the woven, dyed, and finished woven fabric using the composite drawn false twist yarn has a bulge derived from the difference in shrinkage, and is excellent in firmness, stiffness, and resilience.

Further, for example, when the fineness of the high-temperature side yarn is smaller than that of the low-temperature side yarn, the heat of the high-temperature side yarn alone may not sufficiently heat the low-temperature side yarn after merging. Sometimes, the shrinkage of the low-temperature side yarn becomes higher than necessary, and the handleability in the weaving / dyeing process may be reduced. In such a case, after at least two yarns have been combined, the shrinkage can be easily reduced and controlled by heating with a non-rotating heating element between the yarn and the false twist rotor.

Further, by heating the high-temperature side yarn by the non-rotational heating body before the low-temperature side yarn merges with the low-temperature side yarn, the high-temperature side yarn can be reduced in shrinkage. The difference can be increased, and the bulging of the woven or knitted fabric can be increased.

Furthermore, by heating using a rotary heating element after untwisting and before winding, the shrinkage of the composite false twisted yarn can be easily reduced and controlled.

The false twisting apparatus for false twisted yarn of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of the false twisting apparatus of the present invention. In FIG. 1, in a false twisting apparatus including at least a feed roller 2, a rotary heating body 3, a false twist rotor 5, and a draw roller 6 in the order in which the yarn runs, the rotary heating body 3 and the false twist rotor 5 And a merging guide 4 is provided between the two.

The joining point is fixed by the joining guide 4,
Yarn processing is stable. Further, the high-temperature side yarn Ya joins so as to substantially cover the low-temperature side yarn Yb. Therefore, the false twist is climbed to the low-temperature side yarn Yb by the merging guide 4, but the twisting of the high-temperature side yarn Ya is stopped.
Since the twist does not substantially climb the rotary heating element 3, a so-called nip roller provided in contact with the rotary heating element 3 and rotating with the rotary heating element 3 is not required. This not only improves the thermal efficiency of the rotary heating element 3 than when heat is taken away by the nip roller, but also causes the roller to wear due to the false twist climbing up to the rotary heating element 3, and the physical properties of the yarn with time Does not change, the quality is stabilized, and the cost associated with roller replacement can be reduced.

The merging guide 4 may be of any shape and material as long as the merging point of the yarn is fixed. However, a sharp shape that causes yarn breakage or single yarn breakage is not preferable. It is preferable that the portion where the yarn contacts is flat or curved. It is preferable that the material does not change with time, and a ceramic or metallic merging guide is more preferably used.

As shown in FIGS. 2 and 3, the merging guide 4 is preferably provided with a yarn path regulating guide 10 so that the yarn does not come off.

The rotary heating element 3 is a heating element that rotates at substantially the same speed as the yarn and performs heat treatment in a fixed length state. The yarn may be brought into contact with one side of the outer peripheral portion of the rotary heating element. However, in order to sufficiently heat the yarn, the yarn is attached to a Nelson roller composed of a rotary heating element 3 and a separate roller as shown in FIG. It is preferred to wind the strip a plurality of times.

Any structure can be used for the feed roller 2 as long as the yarn is stably supplied. However, an apron roller, a pinch roller as shown in FIG. Winding is preferably performed.

It is preferable to use a plurality of feed rollers as shown in FIG. 4 and to set a draw ratio in accordance with the used yarn.

As the draw roller 6, an apron roller, a pinch roller or the like may be used, but a Nelson roller is preferably used as shown in FIG. 1, and stable drawing is achieved by winding the yarn a plurality of times.

The false twist rotor is not particularly limited, but a circumscribed triaxial twister or a belt nip twister is preferably used.

In order to reduce the shrinkage of the composite false twist yarn,
As shown in FIG. 4, in order to install the non-rotating heating body 11 between the merging guide 4 and the false twist rotor 5 or to reduce the shrinkage of the high-temperature side yarn Ya, as shown in FIG. A non-rotating heating body 11 can be provided between the body 3 and the merging guide 4. The non-rotating heating body 11 is other than the one that heats the yarn by rotating at the same speed as the yarn, and examples thereof include a so-called dry heat heater, a hollow heater, and a high-temperature short heater.

Alternatively, a rotary heating element can be provided as the draw roller 6 to reduce the shrinkage of the composite false twist yarn. Of course, there is no problem if a roller downstream of the draw roller (for example, the relax roller 8 in FIGS. 1 and 6) is a rotary heating element.

It is preferable to impart entanglement to the yarn after untwisting in order to improve the bundleability of the composite false twisted yarn and to improve the weaving passability. An interlace nozzle 7 may be provided between the rollers after the draw roller. However, in order to make the apparatus compact, the draw roller 6 or a roller downstream of the draw roller 6 is a stepped roller as shown in FIG. It is preferable that an interlace nozzle is installed in a yarn path that moves from a roller having a large diameter to a roller having a small diameter and becomes overfeed.

The winding device for the composite false twist yarn is not limited, and the winding device shown in FIG.
Is preferably used, but a spindle-type winding device 12 is also preferably used as shown in FIGS. 4 to 6 in order to save space.

[0040]

EXAMPLES The present invention will be described below more specifically with reference to examples.

The measured values in the examples were obtained by the following method.

[Shrinkage ratio of boiling water] JIS L1090-
It was determined based on the test method of the hot water shrinkage ratio A method (skew shrinkage ratio) of 1992. Sample original length L0, sample length after boiling water treatment Sample length L1 Boiling water shrinkage (%) = {(L0−L1) / L0} × 100 However, the sample was immediately immersed in a bath at 98 ° C.
Heat-treat for minutes.

Example 1 Polyethylene terephthalate semi-dal polymer was melt-spun by a conventional method, and melt-spinning was carried out by a conventional method using 125 denier, 18 filament yarn 1b having a breaking elongation of 188% and polyethylene terephthalate bright polymer. 85 denier, 48
The filament 1a having a cutting elongation of 185% is wound as a highly oriented undrawn yarn (hereinafter, referred to as POY),
Drawing false twist processing was performed using the process of FIG. The feed roller 2 was set at 364 m / min, and the speed of the draw roller 10 was set at 600 m / min. The yarn 1b is heated at room temperature without heating, and the yarn 1a has a surface temperature of 110 ° C. and a speed of 545.
m / min rotary heating element 3 using separate roller 6
Circumferentially heated. Using a triaxial twister as the false twist rotor 6, false twisting is performed at 7000 rpm, and the high-temperature yarn Ya and the low-temperature yarn Yb are twisted by twisting.
Were twisted with the merging guide 4. Here, merging guide 4
Upstream, twisting was observed in the low-temperature side yarn Yb, but no twisting was observed in the high-temperature side yarn Ya. Even when there was no nip roller rotating accompanying the rotary heating element, the rotary heating was performed. He was running stably on body 3. Next, a confound was given between the draw roller 6 and the relax roller 8 by the interlace nozzle 7 to improve the convergence of the yarn, and the yarn was wound by the cheese winding device 9. Further, in order to measure the physical properties of the yarns 1a and 1b, the yarns were wound and separated into yarns 1a and 1b without imparting confounding, and the yarn physical properties were measured. Table 1 summarizes the results of the yarn physical properties.

The completed composite false twist yarn had a gentle crimp, and as shown in Table 1, had a difference in shrinkage between the yarns.
When a sample obtained by heat-treating the yarn 1b with boiling water was observed with a microscope, a thick and thin morphology which was hardly observed before the heat treatment was developed. In addition, 7
Twisting is performed at 50 T / m, and weaving is performed with a plain weave (weft 63 / weft 6
1 / inch) and finished under normal dyeing conditions. The woven fabric has a feeling of repulsion, and the yarn 1a floats on the surface,
It had an excellent swelling feeling.

Examples 2 and 3 In Examples 2 and 3, a 55 denier, 12 filament POY having a cut elongation of 190%, which was melt-spun using a polyethylene terephthalate bright polymer, was wound up in a conventional manner.
Used as a and 1b. Composite stretch false twisting was performed using the process of FIG. Feed roller 2 to 49
At 4 m / min, the speed of the draw roller 6 was set at 818 m / min, and the relax roller 8 was set at 820 m / min.
The yarn 1b was heated at room temperature without heating, and the yarn 1a was wound around the rotary heating body 3 at a surface temperature of 110 ° C. and at a speed of 497 m / min for 6 turns using a separate roller. Using a triaxial twister as the false twist rotor 6, the high-temperature yarn Ya and the low-temperature yarn Yb were twisted by the merging guide 4 by a twisting operation, and the stretch false twisting was performed. Here, twisting was found on the low-temperature side yarn Yb upstream of the merging guide 4, but slight twisting was found on the high-temperature side yarn Ya, and the yarn was rotated with the rotary heating element. Even without the nip roller, the vehicle stably traveled on the rotary heating element 3. In addition, a rotary heating element was used as the draw roller 6 at room temperature (Example 2).
After the heat treatment at 85 ° C. (Example 3), as the relaxing roller 8, interlacing is applied by an interlace nozzle 7 using a stepped roller to improve the convergence of the yarn, and the spindle winding device 12 is used later. And wound up. Furthermore, in order to measure the physical properties of each of 1a and 1b, winding was performed so that confounding and twisting did not occur.
And 1b. Table 1 summarizes the results of the yarn physical properties.

The completed composite false twisted yarn had a gently crimped form as in Example 1, and had a difference in shrinkage between the yarns as shown in Table 1. In addition, when a sample obtained by heat-treating the yarn 1b with boiling water was observed with a microscope, a thick and thin morphology, which was hardly seen before the heat treatment, appeared in all samples. Each of the composite false twisted yarns was further twisted at 800 T / m, woven in a plain weave at a warp of 97 / weft 88 / inch, and finished under ordinary dyeing conditions. The woven fabric had a resilience, and the yarn 1a was raised on the surface, and had an excellent swelling feeling.

[0047]

[Table 1]

[0048]

Since the twisting of the high-temperature side yarn is stopped and the twist does not substantially climb the rotary heating body, a so-called nip roller which rotates accompanying the rotary heating body is not required. . This not only improves the thermal efficiency of the rotary heating body compared to when heat is taken away by the nip roller, but also causes the rollers to wear due to the false twist climbing up to the rotary heating body, and the yarn physical properties over time It does not change, stabilizing the quality and reducing the costs associated with roller replacement.

[Brief description of the drawings]

FIG. 1 is a schematic diagram schematically showing an example of a false twisting apparatus according to the present invention.

FIG. 2 is an example of a schematic diagram in which the merging guide section of FIG. 1 is enlarged.

FIG. 3 is a schematic diagram when FIG. 2 is viewed from a direction indicated by an arrow A.

FIG. 4 is a schematic view schematically showing another example of the false twisting apparatus according to the present invention.

FIG. 5 is a schematic view schematically showing another example of the false twisting apparatus according to the present invention.

FIG. 6 is a schematic view schematically showing another example of the false twisting apparatus according to the present invention.

[Explanation of symbols]

 1a: High-temperature side yarn 1b: Low-temperature side yarn 2: Feed roller 3: Rotary heating element 4: Merging guide 5: False twist rotor 6: Draw roller 7: Interlace nozzle 8: Relax roller 9: Cheese winding device 10 ： Yarn path regulation guide 11 ： Dry heat heater 12 ： Spindle winding device Ya ： High temperature side yarn Yb ： Low temperature side yarn Y ： Composite false twisted yarn

Claims (10)

[Claims] At least one yarn wound around a rotary heating body and subjected to heat treatment to combine at least two yarns having a temperature difference from each other, and the yarn is twisted to form a false twist. In the stretch false twisting in which the low temperature side yarn is heat-treated, the high temperature side yarn is substantially free of false twist until immediately before it merges with the low temperature side yarn. A method for producing a composite false twist yarn. 2. The production of a composite false twisted yarn according to claim 1, wherein after the at least two yarns have been combined, the yarn is heated by a non-rotating heater between the yarn and the false twisting rotor. Method. 3. The composite temporary fabric according to claim 1, wherein the high-temperature side yarn is heated by the non-rotational heating body until the high-temperature side yarn is combined with the low-temperature side yarn. Manufacturing method of twisted yarn. 4. The method for producing a composite false twist yarn according to claim 1, wherein the untwisted material is heated using a rotary heating element. 5. A false twist processing apparatus comprising at least a feed roller, a rotary heating element, a false twist rotator, and a draw roller in the order in which the yarn travels, and joins between the rotary heating element and the false twist rotator. A false twisting machine characterized by having a guide. 6. The false twisting apparatus according to claim 5, wherein a non-rotating heating element is provided between the merging guide and the false twist rotor. 7. The false twisting apparatus according to claim 5, wherein a non-rotating heating body is provided between the rotating heating body and the merging guide. 8. The false twisting apparatus according to claim 5, wherein the draw roller or a roller downstream of the draw roller is a rotary heating element. 9. The method according to claim 5, wherein the draw roller or a roller downstream of the draw roller is a stepped roller, and an interlace nozzle is provided on the roller yarn path. The false twist processing apparatus according to the above. 10. The false twisting device according to claim 5, wherein the winding device is a spindle type winding device.