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AssigneeMatsushita Electric Works, Ltd.
InventorsYoshihiko Nakamura, Masahiro Matsumura, Yasuo Fukuhara, Yukio Hatta, Masaharu Yamamoto, Makizi Miyao, Kiyohiro Nagao, Takayuki Fukuda, Hiroshi Toshima, Shigekazu Takanohashi, Akihiro Atsumi
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In a process for manufacturing a prepreg for use as an electrically insulating material, a main epoxy resin composition and a subsidiary resin composition containing a hardener which have been separately filtered and metered are quickly mixed into a mixture resin composition, a reinforcing member is coated with a uniformly thin film of the mixture resin composition by a die coater under specific temperature, average residence time and low shear conditions, the coated reinforcing member is heated in non-contact manner by an infrared ray heater to have the member impregnated with the resin composition of the film, the member is further heated in non-contact manner by a floating dryer to have the resin composition semi-hardened, and the member is unified through compaction rolls, whereby the prepreg in the form of a sheet-shaped fiber reinforced composite material is continuously manufactured.
A process for continuously manufacturing a prepreg for use as an electrically insulating material consisting of a composite material of a fibrous sheet-shaped reinforcing substrate impregnated with a thermosetting resin, the process comprising the steps of coating uniformly one surface of a fibrous sheet-shaped reinforcing substrate with a matrix thermosetting resin substantially containing no solvent and in molten state by means of a die coater, heating the fibrous sheet-shaped reinforcing substrate coated with the matrix thermosetting resin by means of a non-contact type heating unit to semi-harden the matrix resin, and at least one of the steps of cutting a composite sheet material of the sheet-shaped reinforcing substrate with the semi-hardened matrix resin into pieces of a fixed length, and of reeling the composite sheet material without the cutting, the respective steps being made continuous.
Dependencies are inferred from the claim text.