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Method for producing carbon-fiber bundles

A technology of carbon fiber bundles and manufacturing methods, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, transportation and packaging, etc. It can solve problems such as unstable quality and different physical properties of carbon fiber bundles, and achieve stable quality and high productivity.

Active Publication Date: 2013-04-03
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned method, the heating conditions of each fiber bundle group divided into a plurality of sections in the vertical direction may be different at the upper and lower fiber bundle groups, so the physical properties of the carbon fiber bundle may be different, and the quality may not be stable. Happening

Method used

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  • Method for producing carbon-fiber bundles
  • Method for producing carbon-fiber bundles
  • Method for producing carbon-fiber bundles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0155] In Example 1, using figure 1 Carbon fibers were produced using the apparatus of the configuration shown. To illustrate, the number of fiber bundle blocks and figure 1 different. In addition, in Examples 1 to 12 and Comparative Examples 1 to 3, the fiber bundles located at both ends of each fiber bundle block traveling between the two rollers were compared with the Figure 2 to Figure 4 The inclination angles of the surfaces perpendicular to the axes of the rollers ( 21 ) and rollers ( 22 ) shown are the same angle, and this angle is defined as the maximum inclination angle (θ1). Further, in Examples 1-12 and Comparative Examples 1-3, the fiber bundle blocks located at both ends of the sheet-like fiber bundles running between the angle-adjustable rollers (23-24) are relatively opposite to the rollers (22) And the inclination angle of the surface orthogonal to the axis|shaft of the roller (25) was made into the same angle, and this angle was made into the maximum incli...

Embodiment 2

[0181] The number of fiber bundle blocks in the running pitch changing steps -1 and -2 was changed to 5 blocks, both of θ1-1 were changed to 0.6 degrees, and both of θ1-2 were changed to 2.3 degrees. Except for these, it carried out similarly to Example 1, and produced the carbon fiber bundle. The quality of the obtained carbon fiber bundle was good.

Embodiment 3

[0183] The distances between the flat rolls (23-1) and the flat rolls (24-1) were both changed to 0.75 m, and both θ2-1 were changed to 4 degrees. In addition, the distances between the flat rolls (23-2) and the flat rolls (24-2) were both changed to 0.75 m, and both θ2-2 were changed to 15 degrees. Except for these, it carried out similarly to Example 1, and produced the carbon fiber bundle. The quality of the obtained carbon fiber bundle was good.

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Abstract

Provided is a highly productive method for producing carbon-fiber bundles without deteriorating the quality of the carbon-fiber during the production process. Specifically provided is a method for producing carbon-fiber bundles involving a flame-proofing step, a pre-carbonization step, and a carbonization step, wherein: when P1 represents the travelling pitch of a fiber bundle during the flame-proofing step, P2 represents the travelling pitch of the fiber bundle during the pre-carbonization step, and P3 represents the travelling pitch of the fiber bundle during the carbonization step, the equation 0.8<=P2 / P1<=1.0 and 0.4<=P3 / P1<=0.8 is satisfied; when P11 represents the travelling pitch of the fiber bundle at the inlet of the heating processing section of a pre-carbonization furnace and P12 represents the travelling pitch of the fiber bundle at the outlet of the heating processing section of the pre-carbonization furnace, the equation 0.40<=(P12 / P11)<=0.90 is satisfied; and when P13 represents the travelling pitch of the fiber bundle at the inlet of the heating processing section of a carbonization furnace and P14 represents the travelling pitch of the fiber bundle at the outlet of the heating processing section of the carbonization furnace, the equation 0.40<=(P14 / P13)<=0.90 is satisfied.

Description

technical field [0001] The present invention relates to a method for producing carbon fiber bundles. Background technique [0002] Carbon fiber bundles are usually manufactured as follows: acrylic fiber bundles, which are precursors of carbon fiber bundles, are passed through a furnace (hereinafter referred to as a pre-oxidation furnace) in an oxidative atmosphere at 200 to 300° C. to perform a so-called pre-oxidation treatment, and then sequentially Carbonization is carried out in an inert atmosphere furnace with a maximum processing temperature of 500 to 800°C (hereinafter referred to as a pre-carbonization furnace) or an inert atmosphere furnace with a maximum processing temperature exceeding 1000°C (hereinafter referred to as a carbonization furnace). Furthermore, graphitization can be performed as needed in an inert atmosphere furnace (hereinafter referred to as a graphitization furnace) at a temperature exceeding 2000° C. at a maximum processing temperature, thereby pr...

Claims

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Application Information

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IPC IPC(8): D01F9/32
CPCD01F9/145D01F9/22B65H51/12D01F9/12D01F9/32B65H57/14B65H57/16B65H2701/314B65H2701/38D01F9/14
Inventor 所靖人小谷知之
Owner MITSUBISHI CHEM CORP