To remove a non-reactive gas from a resin naturally after molding and to eliminate the recovery of an organic solvent by a method in which the non-reactive gas which is gas at room temperature and atmospheric pressure is dissolved in a resin of poor moldability at a high pressure, the pressure is reduced, and the resin is pressurized and molded at temperatures which allow the resin to be deformed plastically.
Carbon dioxide as a non-reactive gas is dissolved in ultrahigh molecular weight polyethylene (average molecular weight 2,300,000; melting point 136°C) of a ultrahigh viscosity material as a resin of poor moldability at 60°C and 150kg f/cm2 for 24hr in an autoclave, and the pressure is reduced to atmospheric at room temperature. The resin immediately after the pressure reduction is press-molded at 150°C and 30kg/cm2 for 30sec by a press, cooled at room temperature, and solidified, and the resin is released from the pressure to obtain a sheet 0.5mm in thickness.
DEGUCHI KOUKI
ICHIHARA KOJI
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