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

摘要

The mold comprises a first molding cavity (1) connected to a first hot channel (10) for supplying a primary molding material, a second overmolding cavity (2) connected to a second hot channel (20) for supplying an overmolding material; and a core (3) configured to be first introduced in said first cavity (1) for a molding operation of a first layer (P1), and to then be introduced, with said first layer (P1) thereon, in said second cavity (2) for an overmolding operation of a second layer (P2). At least one supporting member (4) is arranged to support the core (3) with respect to the first cavity (1) during the entire molding operation of the first layer (P1). An opening left in the first layer (P1) by the supporting member (4) is filled and/or covered by the second layer (P2).