MANUFACTURE AND DEVICE FOR OLEFIN RESIN FOAM MOLDED BODY

摘要

PURPOSE:To reduce weight dispersion by making a weight of a prefoaming particle filled into a mold fixed, by a method wherein a temperature of a prefoaming particle to be compressed is measured prior to its starting of compression filling and compression filling pressure suitable for this temperature is fixed. CONSTITUTION:A prefoaming particle to be compressed is sent to a pressure filling vessel 3 through a raw material silo 1 and subhopper 2, the same is compression-filled into a mold 4 with an already known feed device through a feed part 3a after the same is stored hereupon and the same is compression-molded. A device measuring a temperature and apparent density of the prefoaming particle to be compressed which is prior to starting of compression filling, a pressure relief valve 9 maintaining compression filling pressure in the pressure filling vessel and the mold communicating with the pressure filling vessel at a fixed level and a computor/ pressure control device 10 calculating an inhibiting pressure value of the pressure relief valve and establishing automatically are fitted to the title device during a compression molding process. Foam magnification of a foam molded body is made fixed by regulating appropriately the compression filling pressure in accordance with the temperature or the apparent density so that the compression filling pressure becomes high when the temperature or the apparent density of the prefoaming particle is high and when the same is low on the contrary, the compression filling pressure is low.