MOULD AND METHOD FOR MANUFACTURING DOUBLE-LAYERED PREFORMS BY OVERMOULDING, AND DOUBLE-LAYER PREFORM

摘要

A mould comprises a first moulding cavity (1) connected to a first hot ch annel (10) for supplying a primary moulding compound, a second overmoulding cavity (2) connected to a second hot channel (20) for supplying an overmould ing compound, and a punch (3) designed to be introduced first into said firs t cavity (1) for moulding a first layer (P1), and then to be introduced, wit h said first layer (P1) thereon, into said second cavity (2) for overmouldin g a second layer (P2). At least one supporting member (4) is arranged so as to support the punch (3) relative to the first cavity (1) during the entire operation during which the first layer (P1) is moulded. An aperture left in the first layer (P1) by the supporting member (4) is filled and/or covered b y the second layer (P2).