Title:
HIGH-BASIS-WEIGHT CARBON FIBER SHEET FOR RTM PROCESS, AND RTM PROCESS
Document Type and Number:
WIPO Patent Application WO/2013/133437
Kind Code:
A1
Abstract:
A high-basis-weight carbon fiber sheet for an RTM process and an RTM process are provided. This high-basis weight carbon fiber sheet is produced using thick carbon fiber strands, so that the fiber sheet can attain a higher carbon fiber content Vf (the sectional area of carbon fiber per unit sectional area) than that attained by molding a stack of multiple sheets made of thin carbon fiber and thus can improve the performance of an FRP material. In a high-basis-weight carbon fiber sheet (10) for an RTM process, multiple singly twisted fiber bundles (11) or multiple unitedly twisted fiber bundles (12) are arranged in one direction in such a state that the fiber bundles (11) or (12) do not overlap each other, while the fiber bundles (11) or (12) are fixed to each other with a fixing fibrous material. The singly twisted fiber bundles (11) are each produced by: bundling 50000 to 60000 carbon fiber monofilaments (f) to form a carbon fiber strand (F); and twisting the carbon fiber strand (F) by 5 to 50 turns per meter. The unitedly twisted fiber bundles (12) are each produced by: assembling multiple carbon fiber strands (F) which are each obtained by bundling 50000 to 60000 carbon fiber monofilaments (f); and twisting the resulting assembly by 5 to 50 turns per meter. The high-basis-weight carbon fiber sheet (10) has a fiber basis weight of more than 800 to 6000g/m2.
Inventors:
MIYAO MAKIJI (JP)
KOBAYASHI AKIRA (JP)
ARAZOE MASAKI (JP)
KOBAYASHI AKIRA (JP)
ARAZOE MASAKI (JP)
Application Number:
PCT/JP2013/056553
Publication Date:
September 12, 2013
Filing Date:
March 05, 2013
Export Citation:
Assignee:
NIPPON STEEL & SUMIKIN MAT CO (JP)
International Classes:
D04H3/04; B29C43/12; B29C43/34; D02G3/16; D03D1/00; D03D15/12; B29K105/08
Foreign References:
| JP2011246827A | 2011-12-08 | |||
| JP4667069B2 | 2011-04-06 | |||
| JP2004249507A | 2004-09-09 | |||
| JP2008222846A | 2008-09-25 | |||
| JP2004197325A | 2004-07-15 | |||
| JP2003002989A | 2003-01-08 |
Attorney, Agent or Firm:
KURAHASHI, Akira et al. (JP)
Kurahashi 暎 (JP)
Kurahashi 暎 (JP)
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Claims: