| 摘要 |
PROCESS AND DEVICE FOR FORMING PLASTICS MATERIAL IN A MOULD In the course of this process, an amount of expansible mixture is poured into a mould, after which the mould is obturated by means of a plug. A negative pressure is created in the chamber of the mould by way of the plug so as to cause the foaming of the mixture. The negative pressure is maintained for a period after the foamable mixture has filled the whole of the volume of the mould. At the end of the polymerization of the foamable mixture, the negative pressure may be re-applied in the mould, preferably for several cycles, so as to cause the cells of the foam obtained to burst. |
