| 摘要 |
In a method of making moulded objects (62) from foamed plastics, e.g foamed polystyrene, the plastics raw material is introduced in the form of pre-expanded beads containing an expanding agent into a divisible mould (2) and is subjected in this mould to the action of a hot, gaseous foaming agent, which causes the beads to fuse together while further expanding. The thus obtained foam is, before the moulding is removed from the mould, stabilized by forcing through it a stabilizing agent in the form of a gas, e.g. air. The foaming and stabilizing operation can be repeated. A vacuum can also be applied to the moulded object during the working cycle. The relevant mould may possess, instead of the usual nozzles (26) or slits, mould inner walls (28, 30) of porous material, e.g. sintered metal. <IMAGE> |
