| 摘要 |
<p>According to one method an article is formed by introducing unexpanded foam into an elongate, tubular chamber with an uninterrupted bore, partially expanding the foam in the elongate chamber, introducing the partially expanded foam into a second chamber having a shape corresponding to the desired shape of an article to be formed and expanding the partially expanded foam in the second chamber. In another method foam is expanded by partially expanding foam in a first expansion chamber, introducing the partially expanded foam into a second expansion chamber of non-planar form and further expanding the partially expanded foam in the second expansion chamber. In another method foam is expanded in a cylindrical mould to form a cylinder of expanded foam, the cylinder is turned about its axis and a blade is used to cut the expanded foam cylinder into expanded foam sheet as it turns. Apparatus for performing the methods is also disclosed.</p> |
