| 摘要 |
PURPOSE:To produce the titled uniform prepreg at a good rate of production, by impregnating reinforcing fibers drawn unidirectionally and parallelly in sheet form with a B-stage thermosetting resin containing a thermoplastic low- melting polymer. CONSTITUTION:Two release papers 4 and 5 coated with a B-stage thermosetting resin are laid upon the respective upper and lower surfaces of a prepreg base 3 in which warps consist of thermoplastic low-melting polymer yarns (e.g., nylon 6/nylon 12 copolymer) 1 and wefts consist of a number of reinforcing fibers 2 drawn unidirectionally and parallelly with each other in sheet form, and the assemblage is passed between a pair of impregnation rolls 6 heated to 120-170 deg.C and pressed at a pressure of 3-8kg/cm<2> to allow melting of polymer yarns 1 and promotion of spread of fibers 2 and at the same time to allow transfer and infiltration of the resin in the release papers 4 and 5 into material 3.
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