INJECTION MOULD WITH COMPENSATION CHAMBER FOR MOULDING TPU AND OTHER THERMOPLASTIC MATERIALS ON RUBBER TREAD.

摘要

The present invention relates to the footwear sector and more specifically concerns a sole mould (1) for footwear with rubber bottom or tread (2) on which TPU or other thermoplastic materials are injection moulded wherein one or more compensation chambers (4, 4a) that, placed in the area opposite the area where the injected TPU or thermoplastic material is put in, are able to automatically absorb all the possible volume differences caused by expansion of the rubber tread and to automatically compensate the amount of injected thermoplastic material so as to ensure its uniform distribution around the whole perimeter of the rubber bottom or tread of the shoe.