Precursor fiber bundle production method, carbon fiber bundle production method, and carbon fiber bundle
A technology of precursor fiber and manufacturing method, which is applied in the fields of fiber chemical characteristics, wet spinning, textiles and papermaking, etc., can solve the problems of insufficient fiber convergence, and achieve the effect of high display rate and high performance
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Embodiment 1
[0164] The spinning dope was discharged into an aqueous solution (coagulation solution) containing 25% by mass of zinc chloride through a spinneret having 36,000 spinning holes per spinneret. Thus, coagulated fiber bundles are continuously obtained. As the spinning stock solution, a copolymer composed of 95% by mass of acrylonitrile, 4% by mass of methyl acrylate, and 1% by mass of itaconic acid was dissolved in an aqueous solution of zinc chloride at 7% by mass.
[0165] After the coagulated fiber bundle was subjected to water washing stretching, fat application, drying and densification, and post-stretching, water was applied (sprayed) to the coagulated fiber bundle so that the moisture content became 30%.
[0166] Then, in a state where a tension of 0.011 g / dtex was applied to the coagulated fiber bundle with a water content of 30%, it passed through an interlacing imparting device whose blowing pressure of pressurized air was 0.035 MPa in gauge pressure. Thus, a precursor...
Embodiment 2
[0176] Using the same spinning stock solution as in Example 1, it was discharged from a spinneret having 48,000 spinning holes per spinneret. In addition, carbon fiber bundles were produced under the same conditions as in Example 1 except that the tension in the interlacing step was 0.01 g / dtex.
[0177] The burr quality of the carbon fiber thus obtained was good ("O" in the table), and the yarn split ratio was 0.7%.
[0178] The OTS development ratio of the composite material using the obtained carbon fiber bundles was 92% (see Table 1). In addition, other characteristics of the precursor fiber bundle and the carbon fiber bundle are shown in Table 1.
Embodiment 3
[0180] Using the same spinning stock solution as in Example 1, it was discharged from a spinneret having 60,000 spinning holes per spinneret. In addition, carbon fiber bundles were produced under the same conditions as in Example 2 except that the number of fiber bundles was set to 60,000 in the previous step.
[0181] The burr quality of the carbon fiber thus obtained was good ("O" in the table), and the yarn split ratio was 0.7%.
[0182] The OTS development ratio of the composite material using the obtained carbon fiber bundles was 92% (see Table 1). In addition, other characteristics of the precursor fiber bundle and the carbon fiber bundle are shown in Table 1.
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