| 摘要 |
<p>PURPOSE:To control a dimensional change at the time of molding of a laminated sheet to be followed by storage of prepreg, by making use of the prepreg to which dehumidification treatment has been performed for 15-60 minutes at a specific temperature under depressurization. CONSTITUTION:Prepreg 1 is put into a vacuum chamber 3 and dehumidification treatment is performed at a temperature of 30-50 deg.C for 15-60 minutes under a depressurizing condition of 30-60Torr. A necessary number of sheets of prepreg 1, to which dehumidification treatment has been performed, and a metallic foil 4, which is arranged to the top and/or the bottom of the prepreg 1, are superposed upon each other and an obtained laminated body 5 is molded through heating and depressurization. A dimensional change due to a difference in resin flows of the laminated sheet in molding after that, especially a difference in dimensional changes at the central part and an end part can be controlled effectively through this dehumidification treatment.</p> |
