JP2003034466A - Carbon fiber thick yarn package and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carbon fiber thick yarn package with superior winding shape, and causing no lease omission and single yarn winding at unreeling time when winding carbon fiber thick yarn on a bobbin. SOLUTION: This package is formed by winding the carbon fiber thick yarn having the total fineness of the yarn of 25,000 dtex to 100,000 dtex on the bobbin. The manufacturing method of the carbon fiber thick yarn package winds the yarn by setting a tension damping factor of the yarn in a range of 20 to 50% when winding the carbon fiber thick yarn package having a yarn dislocation rate of 50 to 100% and the carbon fiber thick yarn having the total fineness of the yarn of 25,000 dtex to 100,000 dtex.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a carbon fiber package having a particularly high fineness.

[0002]

2. Description of the Related Art The demand for carbon fiber is increasing year by year, and the demand is expanding from premium applications such as aircraft and sports to general industrial applications such as construction, civil engineering, and energy.

In general industrial applications, particularly in the method of forming a large-sized structural material, the fineness required in, for example, a woven fabric, a filament winding method, a pultrusion method, etc. is as large as 100,000 dtex. Currently, in order to meet the above demand, 10,000 to 20,000 dtex
A number of yarns are aligned and molded.

In contrast to the current situation, if a package having a large fineness exists, advantages such as downsizing of creel equipment for high-order processing equipment are brought about, and a great effect can be expected in using carbon fiber. According to Japanese Unexamined Patent Publication No. 7-97138, carbon fibers having an apparent winding density of 1.1 to 1.5 g / cm ³ and a friction coefficient of more than 0.3 are not easily deformed even in an uncore package. However, when winding a carbon fiber thick yarn of 25000 dtex or more, even if the friction coefficient of the carbon fiber is larger than 0.3, the yarn width on the package becomes too wide. However, there is a problem in that the convergence is poor and the winding collapse occurs during winding.

[0005]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a carbon fiber thick yarn which has a good winding shape when winding a carbon fiber thick yarn around a bobbin and does not have a twill drop or a single yarn winding when unwound. To provide a strip package and a manufacturing method thereof.

[0006]

The present invention has the following constitution in order to solve the above problems. That is, a package in which a carbon fiber thick yarn having a total fineness of the yarn of 25000 dtex or more and 100000 dtex or less is wound around a bobbin, and the yarn width on the package is 0.1 to 0.3 m.
m / 1000 dtex, and yarn misalignment ratio is 50 to 10
0% carbon fiber thick yarn package.

Further, the total fineness of the yarn is 25,000 dtex.
It is a method for producing a thick carbon fiber yarn package in which when a thick carbon fiber yarn of 100,000 dtex or less is wound, the tension attenuation rate of the yarn is set in the range of 20 to 50%.

[0008]

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

The present invention has the above-mentioned problem, that is, when a large amount of carbon fiber thick yarn is wound on a bobbin, the carbon fiber thick yarn yarn package has a good winding shape and does not have a twill drop or a single yarn winding when unwound. The above problems were solved all at once by controlling the thread width and thread misalignment ratio when winding a thick thread having a specific friction coefficient with a specific thickness. It is a thing that has been clarified. In addition, it was also clarified that such a package is manufactured by controlling the thick yarn to be wound in a bobbin while controlling it in a range of a specific tension attenuation rate.

The thick carbon fiber yarn in the present invention is composed of a so-called acrylic polymer, for example, a polymer obtained by polymerizing 90% by weight or more of acrylonitrile and less than 10% by weight of a comonomer. Such comonomers include 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, or these One kind or two or more kinds of alkali metal salts and the like can be used.

The acrylic polymer can be obtained by a known polymerization method such as emulsion polymerization, suspension polymerization or solution polymerization. Further, dimethylacetamide can be used for producing acrylic fibers from these polymers. A polymer solution using dimethylsulfoxide (hereinafter referred to as DMSO), dimethylformamide, nitric acid, zinc chloride, and an aqueous solution of rhodanesoda as a solvent is used as a spinning yarn, and is spun by a wet spinning method or a dry spinning method. The spun yarn is then
Although it is subjected to drawing in the bath, drawing in the bath may be carried out directly on the spun yarn, or may be carried out after the spun yarn is once washed with water to remove the solvent. Stretching in the bath is preferably about 2 to 6 times in a stretching bath at 50 to 98 ° C., and after stretching, preferably an oil agent is applied, dried and densified with a hot roller or the like, and subjected to steam stretching. , Packaged on a core bobbin. When winding the package, a plurality of yarns may be combined and wound. The single fiber fineness of the wound yarn is preferably 0.5 to 2.2 dtex, and the number of filaments is preferably 15,000 to 100,000.

In the carbon fiber package according to the present invention, the above-mentioned carbon fiber has a fineness of 25000 dtex or more and 100000 dtex or less, preferably 30,000 dt.
As a fiber bundle of thick carbon fibers of ex or more and 100,000 dtex or less, for example, it is wound in the form of a cheese winding package. If the fineness is less than 25,000 dtex, the effect as a thick carbon fiber decreases, which is not preferable,
If it exceeds 100,000 dtex, the yarn becomes too thick, and it becomes difficult to handle it in high-order processing, which is not preferable.
The number of filaments in the fiber bundle of such thick carbon fibers is preferably 30,000 or more, more preferably 40,000 or more, and further preferably 55,000 to 150,000. In the present invention, the yarn width on the package is 0.1 to 0.
It is important to wind it in the range of 3 mm / 1000 dtex. Thread width is 0.1mm / 1000dtex
If it is smaller than the above range, the yarn thickness becomes thicker, the yarn is pulled during unwinding, and the yarn breakage easily occurs, which is not preferable. Further, if the yarn width is larger than 0.3 mm / 1000 dtex, the convergence of the yarn is deteriorated and twill drop or single yarn winding tends to occur at the time of unwinding, which is not preferable.

It is important to set the yarn misalignment ratio to 50 to 100% in order to prevent the package from being wound in a good shape and preventing traversing and unwinding at the time of unwinding. In the present invention, the yarn deviation ratio is the ratio of the amount of yarn deviation to the yarn width in two yarns that pass in parallel at the closest point on the package, and is (DY / Y) × 10 shown in FIG.
0) is required. If the yarn misalignment ratio is less than 50%, the undulations on the surface of the package become large, and the yarns are easily rubbed during unwinding, and single yarn breakage easily occurs, which is not preferable. On the other hand, if the yarn misalignment ratio exceeds 100%, the winding density decreases, which is not preferable.

The carbon fiber constituting the thick carbon fiber yarn of the present invention preferably has a friction coefficient of 0.3 or more, more preferably 0.35 or more. If the coefficient of friction is less than 0.3, slippage occurs between the carbon fibers, and the shape of the package is easily deformed during and after winding, which is not preferable.

The method of measuring the friction coefficient of the carbon fiber referred to in the present invention will be described with reference to FIG. The carbon fiber yarn 6 unwound from the carbon fiber package 5 is guided through the guide roller 7 to the four fixed guides 8a to 8d. The fixed guides 8a to 8d are metal rods having a diameter of 10 mm and a surface roughness of 0.8S measured by the method described in JIS-B0601, which are attached in parallel to each other and in parallel with the guide roller 7 and the take-off roller 9. . The fixed guides 8a and 8
In d, the yarn path is displaced by 90 degrees, and in the fixed guides 8b and 8c, the yarn path is displaced by 90 degrees, and the total angle θ of displacement is 270 degrees, that is, θ = 1.5π. The yarn drawn from the fixed guide 8d is taken up by the take-off roller 9 at a speed of 3 m / min, and the fixed guides 8a to 8d are rubbed with carbon fibers. The tension Ta on the entrance side of the fixed guide 8a is 0.02 to
0.15 g / dtex. At that time, the tension Tb of the carbon fiber of the yarn drawn out from the fixed guide 8d is measured, and the result calculated by the following equation from the measurement result is taken as the friction coefficient.

Friction coefficient (μ) = {ln (Tb / Ta)} / θ The carbon fiber having a friction coefficient of 0.3 or more is, for example, carbon obtained by firing an acrylonitrile filament obtained by a dry-wet spinning method. A bisphenol / epoxy aqueous solution can be produced on the fiber with the amount of the sizing agent attached to 0.3 to 5%. The adjustment of the friction coefficient can be achieved by changing the amount and composition of the sizing agent, but the method is not limited to this method.

In the present invention, it is also important to optimize the tension damping condition of the yarn at the time of winding. The winding tension of the yarn is preferably high in the initial stage in order to prevent collapse of the yarn, and is low when the winding is completed, so that it is preferable to wind the yarn while damping the tension. 5
It is preferable to wind it in the range of 0%. If the tension at the beginning of winding is T1 (g / dtex) and the tension at the end of winding is T2 (g / dtex), the damping rate of tension is (T1-T2) / T
Calculated as 1 × 100. When the tension attenuation rate is less than 20%, the winding shape collapses and the end surface bulge amount k shown in FIG.
1 and k2 are too large, which is not preferable. Further, if the tension attenuation rate is larger than 50%, the shape is likely to be lost due to an impact received during the transportation of the package, which is not preferable.

[0018]

EXAMPLES The present invention will be specifically described with reference to the following examples. Examples 1 to 3 filament number 50,000, single fiber fineness 0.72 dt
6 kg of the carbon fiber ex was wound on a bobbin having a bobbin diameter of 80 mm with a traverse width of 250 mm using a winder. At that time, the bobbin needle thread width is 0.18 mm / dt
Table 1 shows the results of winding while changing the coefficient of friction by using sizing agents having different compositions with ex, yarn deviation ratio of 70%, tension attenuation ratio of 40%, and different compositions. End face swelling amount as a measure of winding shape (average of k1 and k2 in FIG. 1: (k1 + k2) /
2) was measured. The rate of collapse of the coil during winding and the rate of occurrence of twilling and winding of a single yarn when the carbon fiber package was unwound on a creel of a filament winder were shown as the rate of trouble during unwinding. Comparative Example 1 A bobbin upper thread width of 0.08 mm / dtex, a thread deviation rate of 110%, a friction coefficient of 0.2, and a tension attenuation rate of 10% were used, and 6 kg of yarn winding was tried in the same manner as in the example. . The results are shown in Table 1. Since the coefficient of friction and the damping of tension were lowered too much, winding collapse occurred at the time of winding 3 kg, and the winding became impossible. Comparative Example 2 Bobbin upper thread width was 0.4 mm / dtex, and thread misalignment ratio was 4
A 6 kg yarn winding was tried in the same manner as in the example with 0%, the friction coefficient was 0.2, and the tension attenuation rate was 70%. Since the tension attenuation rate was lowered too much, winding collapse occurred at the time of winding 4 kg and the winding became impossible.

[0019]

[Table 1]

[0020]

According to the present invention, even a package in which a thick carbon fiber yarn having a large fineness is wound around a bobbin, such as a cheese roll, has a good winding shape and does not fall down when unwound. It is possible to achieve simplification of equipment and improvement of productivity in high-order processing applications where thick carbon fibers are required.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining a yarn deviation ratio in a carbon fiber package of the present invention, and is an axial cross-sectional view of a carbon fiber package.

FIG. 2 is a schematic view of a carbon fiber friction coefficient measuring device.

[Explanation of symbols]

1: package 2: bobbin 3: carbon fiber 4: carbon fiber passing parallel to the closest carbon fiber of 4: 3 on the package d: outer diameter of bobbin D: outer diameter of package L: traverse widths k1, k2: End face swelling amount DY: Yarn displacement amount Y: Yarn width 5: Carbon fiber package 6: Carbon fiber yarn 7: Guide roller 8: Fixed guide 9: Take-up roller

Claims (3)

[Claims] 1. The total fineness of the yarn is 25,000 dtex or more 1.
A package in which a thick carbon fiber yarn of 00000dtex or less is wound on a bobbin, the yarn width on the package is 0.1 to 0.3mm / 1000dtex, and the yarn misalignment ratio is 50 to 100%. A carbon fiber thick yarn package characterized by being present. 2. The carbon fiber thick yarn package according to claim 1, wherein the carbon fiber constituting the carbon fiber thick yarn has a coefficient of friction of 0.3 or more. 3. The total fineness of the yarn is 25,000 dtex or more 1.
A method for producing a thick carbon fiber yarn package, which comprises winding a thick carbon fiber yarn having a fiber length of 00000dtex or less at a tension attenuation rate of 20 to 50%.