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AssigneeToray Industries, Inc.
InventorsKiyoshi Homma, Akira Nishimura
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A stitched laminate, in which plural sheets respectively having plural tow-like carbon fibers arranged in parallel to each other are laminated, with the orienting directions of the carbon fiber yarns of the respective sheets kept at different angles against a reference direction, and are stitched integrally using stitching threads. The fineness of each of the carbon fiber yarns is in a range of 1,200 to 17,000 Tex, and the pitch of the arranged carbon fibers yarns is in the range of 8 to 60 mm. In the sheets, the arranged carbon fiber yarns are widened in yarn width to ensure that no gap substantially exists between the respectively adjacent carbon fiber yarns. The plural carbon fiber yarns supplied to form sheets are respectively brought into contact with plural rollers, to be bent and widened in yarn width.
A stitched multiaxial reinforcing laminate, in which plural sheets, each having plural carbon fiber yarns arranged in parallel to each other, are laminated and stitched integrally by means of stitching threads, to ensure that the directions of the arranged carbon fiber yarns of the respective sheets are kept at different angles against a reference direction, characterized in that the carbon fiber yarns have a fineness of 1,200 to 17,000 Tex respectively and are arranged at a pitch of 8 to 60 mm, with the yarn width of each of the carbon fiber yarns widened to the pitch of the arranged carbon fiber yarns.
A process for producing a stitched multiaxial reinforcing laminate comprising a carbon fiber yarn-arranging step of arranging plural carbon fiber yarns respectively having a fineness of 1,200 to 17,000 Tex at a pitch of 8 to 60 mm, with the yarn width of each of the carbon fiber yarns widened to the pitch of the arranged yarns in one direction, a sheet-forming step of forming the arranged carbon fiber yarns into sheets respectively with a carbon fiber yarn unit weight of 50 to 300 g/m2, a sheet-laminating step of laminating the formed plural sheets to ensure that the directions of the arranged carbon fiber yarns of the respective sheets are kept at different angels against a reference direction, and an integrating step of stitching the obtained sheet laminate integrally by means of stitching threads.
Dependencies are inferred from the claim text.