| 摘要 |
<p>A plastics pipe or pipe coupling is made by injection moulding the plastics pipe or coupling body 1, injection moulding at least one sealing ring 3 separately but susbstantially simultaneously, and bringing the body and sealing ring together directly after the moulding while these components are still in a hot as-moulded state, so that a direct thermal bond is formed between them. Preferably, the respective moulds are opened but the components are not stripped but are brought together for bonding while still in position on respective mould members 15, 19. This eliminates intermediate handling and ensures that the moulded components remain clean and of accurate shape and dimension as they are brought together. Moulding apparatus comprises respective injection moulding cavities for the body and sealing ring, and a reversible support for carrying the sealing ring out of its mould and into contact with the moulded body. </p> |
