JPS6235508B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing fibers tapered at both ends. More specifically, the present invention relates to a method of manufacturing an animal hair-like artificial fiber having both ends tapered to a sharp point.

Conventionally, various methods have been proposed for producing artificial fibers that have a texture and appearance similar to natural animal hair by treating the tips of the fibers with chemicals to make them tapered. However, in most of these conventional methods, one end of the fiber is tapered, and a method of tapering both ends at the same time is not well known. A method for tapering both ends of the fibers at the same time is to cover the sides of the polyester fiber bundle with a covering material such as a film and immerse it in a treatment solution containing a hydrolyzing agent. No. 38922) is known, but this method is time-consuming and cannot be processed continuously, making mass production difficult and increasing manufacturing costs. Furthermore, when crimped fibers are processed using this method, the crimping creates dense and dense parts in the fiber bundle, making it difficult to achieve a uniform taper. This causes a problem in that the spinnability of the fibers subjected to the tapering treatment deteriorates.

In order to eliminate the drawbacks of the conventional method, the inventors of the present invention have made extensive studies, and as a result, the continuous fiber bundles are continuously bent, and the bent ends are immersed in a solvent or a hydrolyzing agent solution to dissolve the fibers. Alternatively, the inventors have discovered that by decomposing and cutting, good animal hair-like fibers with tapered ends can be produced continuously on an industrial scale, and have arrived at the present invention.

That is, in the present invention, a continuous fiber bundle made of artificial fibers is continuously bent, and the bent end portions are retained for a longer period of time as they are closer to the bending point.
This method of producing double-end tapered fibers is characterized by immersing the artificial fibers in a solvent or a hydrolyzing agent solution and dissolving and cutting the continuous fiber bundles or decomposing and cutting them.

The man-made fibers used in the present invention include acetate fibers, polyester fibers, polyamide fibers, polyacrylonitrile fibers, polyolefin fibers, vinyl chloride fibers, vinylon fibers, etc., but polyester fibers are particularly preferred.

The polyester fiber is preferably a polyester having ethylene terephthalate as a main repeating unit, and polyethylene terephthalate is particularly preferred.
Copolymerized polyethylene terephthalate obtained by copolymerizing methoxypolyoxyethylene glycol or the like may also be used. Alternatively, a blended polyester fiber obtained by melt-spinning a mixture of polyalkylene glycol, polyalkylene oxyglycol, organic sulfonic acid metal salt, etc. to the above polyester polymer may be used. The degree of polymerization of polyester should be selected appropriately depending on the type of polyester, the desired fiber cross-sectional shape, etc., but in general, in the case of polyethylene tyrephthalate, the intrinsic viscosity measured in an o-chlorophenol solution at 35°C [η] of 0.4 to 0.6 is suitable.

The continuous fiber bundle used in the present invention may be of any type, such as drawn yarn, undrawn yarn, orientated yarn (POY). It can be used regardless of the cross-sectional shape of the yarn. Concerning the state of continuous fiber bundles, it is easier to dissolve and decompose in a treatment bath if the fiber bundles are slightly spread and have a flat cross-sectional shape than if they are tightly bundled. Therefore, it is preferable.

The continuous fiber bundle is continuously bent into a wave shape, and the bent ends are immersed in a solvent or a hydrolyzing agent solution. In this case, the portion closer to the bending point is allowed to stay in the treatment bath for a longer period of time, and is tapered so that dissolution cutting or decomposition cutting occurs at the bending point. In this case, by bending so that the heights of the bending waveforms are different, it is possible to obtain fibers with tapered ends in which fibers of different lengths are mixed.

The following chemicals are used as solvents and decomposition agents for artificial fibers.

(1) For acetate fibers: glacial acetic acid, acetone (2) For polyamide fibers: sulfuric acid, hydrochloric acid, formic acid,
Phenol, metacresol, dimethyl sulfoxide (3) For polyester fibers: Chloroform-phenol mixture, o-chlorophenol, sodium hydroxide, potassium hydroxide, soda carbonate (4) For polyacrylonitrile fibers: Dimethylformamide, dimethyl sulfoxide, Dimethylacetamide, sulfuric acid, malonitrile, ethylene carbonate, succinic anhydride (5) For polyolefin fibers: ethane tetrachloride,
Carbon tetrachloride, cyclohexanone, monochlorobenzene, tetralin, xylene, toluene (6) For vinyl chloride fiber: Tetrahydrofuran, cyclohexanone, dimethylformamide, dioxane (7) For vinylon fiber: Pyridine, phenol, cresol, concentrated formic acid These solvents, The concentration of the decomposing agent used is not particularly limited, and is appropriately selected depending on the type, cross-sectional shape, thickness, desired degree of thinning, heat treatment temperature, treatment time, etc. of the applied artificial fiber. When treating polyester fibers with an aqueous sodium hydroxide solution, the concentration
It is preferable to adopt conditions of 10 to 40%, temperature of 80 to 130°C, and time of about 15 to 120 minutes. A treatment that is stronger than necessary is not preferable because it increases the amount of decomposition, worsens the yield, and causes deterioration of mechanical properties. In addition, when using an alkali metal compound as a decomposing agent for polyester fibers, adding or using quaternary ammonium salts such as lauryldimethylbenzylammonium chloride and cetyldimethylbenzylammonium chloride in combination will reduce the hydrolysis of the polyester fibers. This is desirable because it promotes this.

FIGS. 1 and 2 show an example of an apparatus for carrying out the method of the present invention. Continuous fiber bundle Y
are taken out from the carton box 1, and while being aligned by the alignment bar 2, are placed on the supply roller 3.
An endless conveyor 4 that circulates through the
The gripping bars 5 are provided with a plurality of protruding grip bars 5 spaced apart from each other in the horizontal direction. The continuous fiber bundle Y supplied to the gripping bar 5 is pushed down and bent by the bending bar 7 that moves up and down in the fluid cylinder 6. The gripping bar 5 includes a bar 5a and a holding member 5.
b, and when the continuous fiber bundle Y is supplied, the presser member 5b is open, but
After being pushed down by the bending bar 7 and forming a bend, the presser member 5b closes and comes into close contact with the bar 5a, so as to grip the continuous fiber bundle Y. The operation of this pressing member 5b is performed by bending the bending bar 7.
It is sufficient if it is linked with the operation of . In this way, the continuous fiber bundle Y held in a bent state by the gripping bar 5
is supplied to a treatment bath 8 of a solvent or hydrolyzing agent solution as the conveyor 4 advances, and the bent end Yc is immersed in the treatment bath 8. In this case, conveyor 4
runs at an angle with respect to the liquid level of the processing bath 8, so that the bent end of the continuous fiber bundle Y
Yc stays in the treatment bath 8 for a longer period of time as it approaches the bending point _YE . The degree of inclination of the conveyor 4 and the immersion depth of the bent end Yc can be adjusted as appropriate depending on the desired taper length and degree of the tip. Further, in order to increase processing efficiency, the continuous fiber bundle Y can be vibrated in small steps in the vertical direction in the processing bath 8. In this way, the fibers are dissolved and cut or decomposed near the bending point _YE , and the dissolution or decomposition reaction progresses closer to the bending point _YE , resulting in a tapered fiber. The fibers Y' cut in the treatment bath 8 and tapered at both ends are washed with a shower device 9 of water or solvent, and then placed on the transfer conveyor 10 by tilting the bar 5a downward to remove the fibers Y' from the gripping bar 5. It is released from the gripping state and is dropped onto the transfer conveyor 10. Next, a finishing agent is applied as necessary, and then the product is dried. Note that 11 is a washing water recovery device.

FIG. 3 shows an example of another apparatus for carrying out the method of the present invention, in which a continuous fiber bundle Y is pressed against a gear-like rotating body 20 using a bar 21, and the continuous fiber bundle Y is bent. In this state, the rotating body 20 is slowly rotated, and the processing bath 8 provided below the rotating body 20 is heated.
The bent end Yc is immersed in the process.

As described above, according to the present invention, good animal hair-like fibers having tapered ends can be manufactured continuously on an industrial scale, and the length and shape of the tapered end portion can be adjusted to It can be changed arbitrarily by adjusting the processing conditions.

The artificial fiber of the present invention has an appearance, luster, texture, and feel that are extremely similar to natural animal hair, and has good polishability during processing, and can be knitted using a sliver knitting machine to produce a raised fabric that looks like natural fur. After spinning or spinning yarn, it can be made into woven or knitted fabrics and used for clothing, etc.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 A circular cross-section single yarn of 50 denier with an intrinsic viscosity of 0.65 measured in o-chlorophenol solution at 25°C.
A polyethylene terephthalate non-crimped tow consisting of 10,000 pieces was treated using the apparatus shown in FIGS. In the apparatus shown in FIGS. 1 and 2, the bar 5a has a length
They are 200 mm long and 5 mm in diameter, and are protruded from the conveyor 4 at intervals of approximately 20 mm. The length of the tow hanging between each bar (approximately twice the height of the bending waveform) is approximately
The tow bent end Yc is pushed down by the bend forming bar 7 so that it becomes 80 mm, and the tow bent end Yc is immersed in the processing bath 8 as the conveyor 4 advances. As treatment bath 8, a hydrolyzed aqueous solution consisting of 20% sodium hydroxide and 3% cetyltrimethylammonium bromide was heated to 97° _C . The water was immersed at a constant speed to a depth of about 20 mm over about 50 minutes. After the treatment was completed, the fibers to be treated were immediately taken out from the treatment bath, washed with a water shower device 9, and then dried.

The treated tow was decomposed and cut near the bending point _YE , and a good quality animal hair-like fiber with a length of about 70 mm and tapered ends was obtained.

Example 2 Approximately 1 cruciform cross-section single yarn of 30 denier with an intrinsic viscosity of 0.65 measured in o-chlorophenol solution at 25°C
A polyethylene terephthalate crimped tow consisting of 7,000 pieces was treated in the same manner as in Example 1. However, the hanging length of the tow (approximately 2 times the height of the bending waveform)
The mounting position of the gripping bar 5 (bar 5a, presser member 5b) on the conveyor 4 was changed so that three types, 60 mm, 74 mm, and 90 mm, were mixed. Further, the treatment time in the treatment bath was approximately 25 minutes.

The treated tows were disassembled and cut near the bending point _YE , and the apparent lengths were approximately 56 mm, approximately 70 mm, and approximately 86 mm.
Three types of crimped fibers each having a distribution peak at mm were mixed, and a good animal hair-like fiber with tapered ends was obtained. In addition, no crimping was observed at all.

Example 3 A 20-denier polyester having an intrinsic viscosity of 0.40 as measured in an o-chlorophenol solution at 25°C and consisting of a copolymerized polyester obtained by copolymerizing 2.0 mol% of sodium sulfoisophthalate with respect to polyethylene terephthalate. A crimped tow consisting of approximately 25,000 single yarns in cross section was treated in the same manner as in Example 1. However, the treatment time in the treatment bath was approximately 15 minutes.

The treated tow was disassembled and cut near the bending point _YE , and the apparent length was distributed around 68mm.
A good animal hair-like fiber with tapered ends was obtained. Also, no crimping was observed at all.

Example 4 Nylon 6 (polycaprolactam) with an intrinsic viscosity of 1.1 measured in m-cresol at 35°C
A crimped tow composed of approximately 1,000 denier flat cross-section single yarns was treated using the apparatus of Example 1.

The bent end Yc of the tow was immersed in the treatment bath 8 so that the hanging length between each bar (approximately twice the height of the bent waveform) was about 60 mm.

As treatment bath 8, 90% of formic acid aqueous solution with a concentration of 40% was used.
The bent tow was immersed in this treatment bath at a uniform speed over a period of about 10 minutes to a portion approximately 15 mm above the bending point _YE so as to gradually become deeper. After the treatment was completed, the fibers to be treated were immediately taken out of the treatment bath, washed with methanol in a shower device 9, and then dried. The treated tow was decomposed and cut near the bending point _YE , and a good animal hair-like fiber with an apparent length of about 50 mm and tapered ends was obtained.

Example 5 A crimped acrylic tow composed of about 700 70-denier single yarns with a cocoon-shaped cross section was treated using the apparatus shown in FIG.

In the device shown in FIG. 3, the toe length between adjacent bars 21 (about twice the height of the bending waveform) is approximately 60 mm.
The tow was pressed against the gear-like rotating body 20 so that the width of the tow was 150 mm. Next, the gear-like rotating body 2
0 was slowly rotated at a constant speed so that the tip of the gear was immersed in the processing bath 8 for about 15 minutes, and the tow bent end Yc was immersed in the processing bath 8. As treatment bath 8, a 60% by weight dimethylformamide aqueous solution was used.
The bent tow was immersed in this treatment bath 8 up to a maximum of about 15 mm above the bending point _YE . After the treatment was completed, the treated fibers were washed with methanol and dried. The treated tow was decomposed and cut near the bending point _YE , and a good quality animal hair-like fiber with a length of about 50 mm and tapered ends was obtained.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an example of an apparatus for implementing the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a side sectional view showing another example of an apparatus for implementing the present invention. It is a diagram. Y is a continuous fiber bundle, Yc is a bent end of the continuous fiber bundle, Y _E is a bending point of the continuous fiber bundle, and 8 is a treatment bath (solvent or hydrolyzing agent solution).

Claims (1)

[Scope of Claims] 1. A continuous fiber bundle made of artificial fibers is continuously bent, and the bent ends of the artificial fibers are treated with a solvent or hydrated so that the portions nearer to the bending point stay there for a longer period of time. A method for producing double-end tapered fibers, which comprises immersing the continuous fiber bundle in a decomposing agent solution and dissolving or cutting the continuous fiber bundle. 2. The method according to claim 1, wherein the man-made fiber is a polyester fiber. 3. The method according to claim 2, wherein the hydrolyzing agent solution is an alkaline aqueous solution.