| 摘要 |
A technique for moulding items, in particular hollow items, using resin transfer moulding, in such a manner that the resin (24) is more uniformly distributed about and along the moulding region (16) of the mould (12,14). This is accomplished by installing oppositely spaced groove (22) in the mould (12,14) and injecting resin (24) directly into these grooves (22). Upon such injection, the resin (24) travels along and fills the groove (22), by taking the path of least resistance, before such resin (24) is squeezed or forced out of a minute gap (50) between the moulding surfaces and into the moulding region (16) of the mould (12,14). As such resin (24) is being forcibly injected into the cloths (20) in the mould, a vent (42) permits any air displaced from the cloths (20) by the resin (24) to be released. Such resin injection and mould venting occurs until such time that no more air is vented and instead 100% resin (24) is being discharged from the mould (12,14). Upon this occurrence, further resin injection is curtailed and the resin (24) previously injected is allowed to harden and cure. A disposable pressure bag (18) distributes the moulding pressure created by the injected resin equally within the mould. Thus this pressure bag (18) enables a high quality void-free plastics laminate to be made. <IMAGE> |
