Method for producing dry preform for composite material
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United States of America Patent
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Jun 10, 2008
Grant Date -
Jul 15, 2004
app pub date -
May 28, 2003
filing date -
Jan 14, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A novel process for producing a dry preform for a composite material takes advantage of the fact that a reinforcing filament assembly, when consisting of a fiber reinforcement layer a, formed by stringing a first set of parallel strands of fiber reinforcement over a part or all of the plane within any desired shape along the straight axis 2, and a fiber reinforcement layer b, formed by stringing a second set of parallel strands of fiber reinforcement over the plane at an angle .theta. with respect to the straight axis 2, such that 0.degree.<.theta.<180.degree., the part of the reinforcing filament assembly that consists solely of the fiber reinforcement b can be deformed as desired. According to this process, strands c of fiber reinforcement are strung using a fiber reinforcement string jig as shown in FIGS. 8(A) and 8(B). The layers of the strung strands of fiber reinforcement are brought together by a simple means such as stitching. The integrated layer is then shaped into the reinforcing filament assemblies 3, 4, which are combined to form a dry preform 1 for making a composite material having any desired alignment of fiber reinforcement.
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