| 摘要 |
A process for moulding a composite body comprising an outer thermoplastic envelope and a cellular plastic filling anchored to the inner wall of the envelope, e.g. a sailboard, is described. The envelope is produced by blow- moulding a tubular parison (3) whose inner wall has point-shaped roughnesses (4) which subsequently provide the mechanical anchoring of the cellular filling to the inner wall of the envelope. The parison is delivered through an extrusion head whose core (2) possesses grooves (5), the temperature of the core being at least 20 DEG C below the temperature of the outer die (1). The grooves (5) cause the points (4) to be formed. After the parison (3) is formed as shown in Fig. 1, it is introduced into a blow-mould (not shown) and blown, and after de- moulding the cellular plastic, e.g. expandable polyurethane, is injected into the blow-moulded envelope. <IMAGE> |
