| 摘要 |
A mould suitable for moulding non-polar expanded plastics material is constructed wholly, body 1 and mould lining 2, from a material having a low or zero loss angle, in which the mould lining 2 is made from a porous material, capable of absorbing liquids, the surface 3 of the mould lining 2 adjacent the body 1 of the mould being made impermeable. e.g. by the application of silicones. The porous material used for the mould lining 2 may be a ceramic, faience, silica, alumina, clay or kaolin. Pre- expanded beads of plastic material 5 are introduced into the mould and are subjected to UHF radiation. <IMAGE> |
