To reduce the volume of a resin molding such as a foamed polystyrene in a simple process and also prevent the contamination of the resin molding after volume reduction.
In reducing the volume of a resin molding such as a foamed polystyrene, the resin molding 5 is heated to reduce its volume with a high temp. liquid as a heat source, where, as a heat source, a high temp, and a high b.p. liq. 2 having a b.p. of not less than 423K and a specific gravity of not less than 0.8 and a vapor pressure at drying temp. of not less than 20mmHg, e.g. a highly fluorinated compd. or low molecular polyorganosiloxane, is used. The resin molding 5 is, after thermal melting, taken out by cooling and solidifying or as a heat shrunken material by heat shrinking.
IMASHIRO YASUTAKA
KIMOTO KOREHIKO
SAITO NOBUHIRO
UEKI CORP KK
TOSHIBA SILICONE