INJECTION MOULDING PLASTIC COMPONENTS WITH A SLIT

摘要

A method of injection moulding a plastics component includes providing a first mould member with a mould cavity, which is defined by an internal surface, and a second mould member with an external surface whose shape is complementary to the shape of the mould cavity. Either the internal surface or the external surface carry an elongate formation with an elongate apex. The method includes advancing the second mould member into the mould cavity such that the apex is spaced from the opposed one of the internal surface and the external surface by a predetermined distance and the internal surface of the first mould member and the external surface of the second mould member together define a mould space. Molten polyolefin material is then injected into the mould space to substantially fill it. The predetermined distance is so dimensioned that the polyolefin material does not completely fill the space between the apex and the opposed surface and the slit is thus formed.

主权项

1. A method of injection moulding a plastics component with a slit comprising:
providing a first mould member with a first mould surface, and a second mould member with a second surface having a substantially complementary shape to the first mould surface and having an elongate apex; advancing one mould member relative to the other mould member such that the elongate apex of the second mould surface is spaced from the opposed portion of the first mould surface by a predetermined spacing, the first and second mould surfaces of the advanced members defining a mould space; and injecting injection mould material into the mould space with the predetermined spacing to substantially fill the mould space, the predetermined spacing being sufficiently narrow to form a slit between the elongate apex and the opposing portion of the first mould surface during injection and being sufficiently narrow such that the edges of the formed slit form a substantial seal to viscous liquid material.