JPH09255227A - Carbon fiber precursor acrylic fiber package and winding method for carbon fiber precursor acrylic fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the protrusion of single fibers from a grooved roller and prevent fuzzing and fiber cutoff by specifying the fiber width of an acrylic fiber on a package in the package winding the carbon fiber precursor acrylic fiber having the total fineness of the specific denier or above. SOLUTION: A carbon fiber precursor acrylic fiber 1 having the total fineness of 12000 denier or above and the fiber width in the range of 0.25-0.6mm/1000 denier is fed through a least two stages of a fiber focusing free guide roller group 3, then it is wound by a winder. The fiber focusing free guide roller group 3 is constituted of multiple first free rollers 5 arranged with their roller shafts practically perpendicularly to the traveled fiber and in parallel with each other and at least one second free roller 6 arranged with its roller shaft practically perpendicularly to the first free rollers 5. The surface and back of the fiber are brought into contact with the first free rollers 5 in turn, then the fiber passes through the second free roller 6 while being twisted by it.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a carbon fiber precursor acrylic yarn yarn package and a method for winding a carbon fiber precursor acrylic yarn yarn suitable for obtaining such a package, and more specifically, to an acrylic yarn yarn. A carbon fiber precursor acrylic yarn package and a carbon fiber precursor acrylic yarn package which can prevent the yarn from protruding from the groove when the carbon fiber is obtained by running a grooved roller and firing to obtain a carbon fiber, and can bring about good operational stability in the firing process. The present invention relates to a method for winding a carbon fiber precursor acrylic yarn that is suitable for obtaining a package.

[0002]

2. Description of the Related Art Polyacrylonitrile-based yarns are used as a precursor of carbon fibers, and many improvement techniques have been disclosed in order to obtain carbon fibers having excellent performance. Carbon fiber is a precursor of acrylonitrile-based yarn, which is once wound in a spinning process to form a package, and then the yarn is unwound from the package and sent to a firing process, and 200 to 3
A flame-proofing process of heating and firing the yarn in an air atmosphere of 00 ° C to convert it into an oxidized fiber, and a carbonization process of further heating to 300 to 3000 ° C in an inert atmosphere of nitrogen, argon, helium or the like to carbonize. It is obtained through the process and is widely used as a reinforcing fiber for composite materials in aerospace applications, sports applications, and general industrial applications.

Carbon fibers generally have one single fiber.
One filament unit is a multifilament composed of 000 or more filaments. In the firing step, especially in the flameproofing step, in order to prevent the filament yarn from coming into contact with the adjacent yarn, in many cases, a grooved roller is used to prevent interference with the adjacent yarn.

Generally, as a means for increasing the productivity of carbon fibers, the precursor yarns are made into multifilaments (thick yarns) and the number of treated yarns per facility is increased (high density). It is effective to increase the production amount in a limited equipment, that is, to improve the equipment productivity. With such improvement in equipment productivity, the number of monofilaments constituting the yarns to be treated in the firing process, for example, 15
Thick threads, such as 000 filaments or more,
When the density is increased, there is a problem in that the thread protrudes from the grooved roller and a part of the filament enters the adjacent groove, which causes fluff and thread breakage.

To address this problem, Japanese Patent Publication No. 59-28
Japanese Patent No. 662 discloses a technique in which a grooved roller having a defined groove shape is used in a flameproofing process. Even with such a grooved roller, a thick yarn having a filament number of, for example, 15,000 or more is used. Then, it became clear that when the grooved roller is used especially in the flameproofing step, the single fiber protrudes from the groove of the grooved roller, and fluff and yarn breakage increase.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to suppress the protrusion of single fibers from a grooved roller when firing a thick acrylic yarn using a grooved roller, and It is an object of the present invention to provide a carbon fiber precursor acrylic yarn package capable of providing stable operability without fluff and yarn breakage, and a method of winding a carbon fiber precursor acrylic yarn suitable for obtaining such a package.

[0007]

The carbon fiber precursor acrylic yarn package of the present invention has the following constitution in order to solve the above problems. That is, the total fineness of the yarn is 120
In a package in which a carbon fiber precursor acrylic yarn having a denier of 00 denier or more is wound, the yarn width of the acrylic yarn on the package is 0.25 to 0.6 mm /
It is a carbon fiber precursor acrylic yarn package characterized by having a denier of 1000. Further, the method for winding a carbon fiber precursor acrylic yarn of the present invention has the following constitution in order to solve the above problems. That is, a method for winding a carbon fiber precursor acrylic yarn, characterized in that the acrylic yarn is passed through at least two stages of free yarn guide roller groups for yarn focusing and then wound by a winder. is there.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

The acrylic polymer used as the material for the acrylic yarn applied to the present invention is 90% by weight of acrylonitrile.
The polymer is composed of the above. Therefore, another monomer may be contained as a copolymerization component within 10% by weight. As the comonomer, acrylic acid, methacrylic acid, itaconic acid, or their methyl ester, ethyl ester, propyl ester, butyl ester, alkali metal salt, ammonium salt, or allyl sulfonic acid, methallyl sulfonic acid, styrene sulfonic acid, or One or more of these alkali metal salts can be used.

The acrylic polymer is polymerized by a known polymerization method such as emulsion polymerization, suspension polymerization and solution polymerization. Further, when producing an acrylic yarn from these polymers, dimethylacetamide and dimethylsulfoxide are used. (Hereinafter, DMSO), dimethylformamide, nitric acid, zinc chloride, a polymer solution using an aqueous solution of rhodanesoda, etc. as a solvent is used as a spinning dope, and spinning is carried out by an ordinary wet spinning method or a dry wet spinning method. The spun yarn is then subjected to drawing in a bath, but drawing in the bath may be carried out directly by spinning, or may be carried out after washing once with water to remove the solvent. Stretching in the bath is usually about 2 to 6 times in a stretching bath at 50 to 98 ° C., and after stretching, usually an oil agent is applied, dried and densified with a hot roller or the like, and then subjected to steam stretching. It is wound into a package by a winding machine in a non-twisted state. When winding the package, a plurality of yarns may be combined and wound. In general, the wound filament has a single fiber fineness of 0.5 to 2 denier and a number of filaments of 15,000 to 100,000.

The yarn wound into the package is set on a creel in the firing process, then drawn out, introduced at a low speed to a flameproofing furnace, and treated in air at about 200 to 300 ° C. In order to prevent the yarns from overlapping with each other in the flameproofing step, a large number of rollers having a plurality of grooves having a width of 3 to 15 mm in the circumferential direction, so-called grooved rollers, are usually used. The flame-proofed yarn is continuously treated in nitrogen at about 300-10.
It is passed through a pre-carbonization furnace at 00 ° C. and a carbonization furnace at about 1000 to 2000 ° C. in nitrogen continuously to form carbon fibers.

The most characteristic feature of the present invention is that the total fineness of the yarn is set to 1200 in order to prevent the single filament of the acrylic yarn from protruding from the grooved roller used for flameproofing.
In a package in which a thick thread having a denier of 0 denier or more, preferably 12,000 to 50,000 is wound,
The width of the acrylic yarn on the package is 0.25 to 0.
It is 6 mm / 1000 denier. If the yarn width on the package is smaller than 0.25 mm / 1000 denier, burning marks are generated during flameproofing and yarn breakage occurs in the subsequent pre-carbonization / carbonization step, which is not preferable. If the yarn width is larger than 0.6 mm / 1000 denier, the yarn will protrude from the grooved roller, which is not preferable.

In order to obtain a package in which the yarn width of the acrylic yarn on the package is within the above range, when the yarn is wound by the winding machine, the yarn collecting free guide roller group is arranged in two or more stages. A method of winding after passing it is preferably used. An example of the free yarn guide focusing roller group is a guide roller group described in Japanese Patent Application Laid-Open No. 26950/1990, that is, a plurality of roller shafts arranged so as to be substantially perpendicular to the running yarn and parallel to each other. It is preferable that the first free roller and the first free roller include at least one second free roller whose roller axis is arranged substantially at right angles. An example of such a free guide roller group is shown in FIGS. As shown in these figures,
In such a group of free guide rollers, the yarn is passed through a plurality of first free rollers so that the front and back of the yarn are alternately contacted, and then the second free roller twists the yarn to form the yarn. Focus. By passing the yarn through such a free guide roller group, there is an effect of bundling the single fibers that tend to protrude to the end of the yarn, but the yarn bundling effect is further increased, and the acrylic yarn on the package is increased. In order to stabilize the operation in the flameproofing step, it is necessary to pass these free guide roller groups in two or more stages, preferably three or more stages in order to stabilize the operation in the flameproofing process. In particular, when a plurality of yarns are combined and wound up, it is preferable to pass the combined yarns through the yarn collecting free guide roller group in order to improve the combining effect. The tension of the yarn when passing the yarn through the free guide roller group is more preferably 35 dyne / denier to 620 dyne / denier because the yarn focusing effect is large.

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

FIG. 1 is an example of a conventional yarn winding method, and FIG. 2 is an example of the yarn winding method used in the present invention, both of which are schematic views immediately before the acrylic yarn is wound. In FIG. 2, 1 is an acrylic yarn, 2 is a drive station,
3 is a free guide roller group, and 4 is a package wound up. In this figure, an example using three stages of free guide roller groups is shown. The yarn collecting effect can be increased by inserting the free guide roller group No. 3 in multiple stages before winding the package.

[0016]

EXAMPLES The effects of the present invention will be specifically described with reference to the following examples.

Example 1 Intrinsic viscosity [η] consisting of 99.6 mol% acrylonitrile and 0.4 mol% itaconic acid
Was used as a spinning stock solution with a 19% DMSO solution of an acrylic polymer of 1.80, and a wet spinning was performed in a coagulation bath of 60% DMSO and 40% water at 50 ° C. using a spinneret with a hole number of 6000 and a diameter of 6000. The coagulated yarn was obtained. While the coagulated yarn was washed with water, it was drawn 5 times in hot water, and the remaining DMS was drawn.
After O was washed with water to 0.01% or less in the yarn, a silicone-based oil agent was applied and dried and densified at 150 to 160 ° C. Subsequently, after drawing 2.5 times in pressurized steam, it is dried again and three 6000 filament yarns are combined to obtain a single fiber fineness of 0.7d and a filament number of 180.
A filament having a total fineness of 12600 denier was used, and the filament was passed through the free guide roller group shown in FIG. 3 by changing the number of stages and then wound by a winder.
In addition, for comparison, an experiment was also performed in the case of winding without using the free guide roller group. Table 1 shows the results of examining the yarn width on the yarn package after winding and the operation stability when flame resistant.

From Table 1, when the roll was wound without the free guide roller group, the yarn width was too wide and the yarn breakage occurred frequently in the flameproofing process. However, it has been clarified that by inserting a plurality of free guide roller groups, the yarn width on the winding package is narrowed, the yarn focusing effect is increased, and the operation in the flameproofing process is stabilized.

[0019]

[Table 1] (Example 2) Using the same acrylic spinning dope as in Example 1 and using a 4000-hole spinneret with a hole diameter of 0.1 mmφ, a 5 mm air layer was placed in a 0 ° C. coagulation bath consisting of 35% DMSO and 65% water. After that, dry-wet spinning was performed to obtain a coagulated yarn.
The coagulated yarn was washed with water and then stretched 3 times in hot water (remaining DM
SO was 0.01% or less in the yarn), and after applying a silicone-based oil agent, it was dried and densified at 170 to 190 ° C. After applying a 4 times stretch in pressurized steam, 4000
After combining 6 filament yarns, single fiber fineness 1.0
d, the number of filaments is 24,000 filaments, the yarn has a total fineness of 24,000 denier, and after passing the free guide roller group shown in FIG.
I wound it up with a winder. In addition, for comparison, an experiment was also performed in the case of winding without using the free guide roller group. Table 2 shows the results of examining the yarn width on the yarn package after winding and the operation stability when flame resistant.

It can be seen from Table 2 that by inserting a plurality of free guide roller groups, the yarn width on the winding package is narrowed, the yarn focusing effect is increased, and the operation in the flameproofing process is stabilized. If the yarn width is too narrow, there was no problem in the operability in the flame resistance process, but the focusing property is too high and the flame resistance is insufficient, and fluff occurs in the carbonization process to deteriorate the quality of the carbon fiber. There was an evil.

[0021]

[Table 2]

[0022]

EFFECT OF THE INVENTION The carbon fiber precursor acrylic yarn package of the present invention suppresses the protrusion of single fibers from the grooved roller of the acrylic yarn in the subsequent firing process such as the flameproofing process. It is possible to obtain stable operability without fluff or yarn breakage. Further, such a package can be easily obtained by the winding method of the carbon fiber precursor acrylic yarn of the present invention.

[Brief description of drawings]

FIG. 1 is a schematic view showing a conventional manufacturing method.

FIG. 2 is a schematic view showing an example of the manufacturing method of the present invention in which three stages of free guide rollers are passed.

FIG. 3 is a plan view showing an example of a yarn guide free guide roller group used in the present invention.

FIG. 4 is a side view of the yarn bundle free guide roller group shown in FIG. 3;

[Explanation of symbols]

 1: Acrylic yarn 2: Drive station 3: Free guide roller group 4: Winding yarn package 5: 1st free roller 6: 2nd free roller

Claims (3)

[Claims] 1. A package in which a carbon fiber precursor acrylic yarn having a total fineness of yarn of 12,000 denier or more is wound up, and the yarn width of the acrylic yarn on the package is 0.25 to 0.25. A carbon fiber precursor acrylic yarn package characterized by having a denier of 0.6 mm / 1000. 2. A winding of a carbon fiber precursor acrylic-based yarn, characterized in that the acrylic-based yarn is passed through at least two stages of free guide roller groups for yarn focusing and then wound up by a winder. How to take. 3. A plurality of first free rollers in which a yarn focusing free guide roller group is arranged such that a roller shaft thereof is substantially perpendicular to a traveling yarn and parallel to each other.
The first free roller is composed of at least one second free roller having its roller axis arranged substantially at right angles, and the traveling yarn is provided in the yarn focusing free guide roller group. The carbon fiber according to claim 2, wherein, when passing, the plurality of first free rollers are alternately brought into contact with the front and back of the yarn, and then the second free roller is passed so as to give a twist. A method of winding a precursor acrylic yarn.