MOLD RELEASE SHEET FOR PRODUCING SUBSTRATE AND METHOD FOR PRODUCING SUBSTRATE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a mold release sheet for producing a substrate used in a method for producing the substrate having high reliability and excellent productivity.

SOLUTION: Optional parts of a prepreg 1 and a copper foil 3a are hot-pressed through the mold release sheets 5 for producing the substrate with heater punches 4a and 4b to thereby soften a resin contained in the prepreg 1 and carry out adhesion. Only the heater punches 4a and 4b are then opened once. After the temperature of the prepreg 1 becomes a temperature not higher than the softening point of the resin contained in the prepreg, the mold release sheets 5 for producing the substrate are successively released from the one side and a copper foil 3b is further laminated to hot-press the optional parts again with the heater punches 4a and 4b. The whole surface is then hot-pressed with a hot press.

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