| 摘要 |
1,071,561. Moulding moulds. R. B. BUONAIUTO. Dec. 17, 1964 [Jan. 29, 1964], No. Heading B5A. 51472/64. A mould for the production of foamed polymeric articles by dielectric heating comprises a plastic mould body which is lined, in the stratum immediately underlying and including the moulding surface, with porous material intimately bonded to the body. The porous material is stated to form a better surface to the foamed article. As shown the mould is formed by the surface of a pattern of an article 10 being coated for example by brushing or coating with a film 12 of a solidifiable viscous material. Whilst the film 12 is still wet, flock 14 is applied'either by sprinkling or by a flocking gun. When the film 12 is dry, a backing 16 is sprayed or otherwise applied to form the plastic mould body, the backing being formed of polyester resin reinforced with chopped glass fibre reinforcing strands or an epoxy resin reinforced with sand, and cooling tubes 18 are incorporated in the backing. The pattern 10 is then removed, and the film 12 is removed, for example by means of a solvent. In another example of how the mould is made, the backing is first formed, and then brushed or sprayed with a layer of adherent material, which when still wet is sprinkled with nylon flock. In another embodiment, Figs. 4 to 9 (not shown), the article is placed in a bath of hot gelatine and water, which is subsequently allowed to gel. The gel is then stripped from the bath and article, painted or sprayed with aqueous polyvinyl alcohol and then coated with nylon flock. A backing layer of glass fibres and polyester is applied and allowed to set. The gel is then stripped. |
