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Paper SA
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Paper SA
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Priority to ES8602901ApriorityCriticalpatent/ES2003464A6/en
Publication of ES2003464A6publicationCriticalpatent/ES2003464A6/en
Sheet material and hollow or tubular articles, for use as pipes, concrete moulds, etc. are made from reinforced thermosetting resin, are made by impregnating a layer of reinforcing fibres or yarns with a catalyst on one face and a resin with accelerator on the other face. The layer is then compressed with heating to form a film, and a series of such films superimposed with an intermediate layer of resin plus accelerator. After hot compression, which catalyses the resin, the article is moulded to shape giving flexible and strong prods. resistant to moisture.
Multi-ply hollow mouldings mfr. from fleece and resin impregnant - hardening under low press. by winding upon a rubber bag placing into a mould, heating, inflating and curing