Moulding of synthetic resinous materials

Claim 1

A METHOD OF PRODUCING A MOULDED SYNTHETIC RESINOUS PRODUCT CONSISTING OF A FELT OF WOVEN FIBROUS COMPONENT AND A CURED SYNTHETIC RESIN MIXTURE IMPREGNATED THERETHROUGH, COMPRISING THE STEPS OF IMPREGNATING A COMPONENT HAVING A MONOHYDRIC PHENOL ALDEHYDE RESIN DISPERSED THERETHROUGH, WITH A POLYHYDROXY PHENOL ALDEHYDE RESIN STABLE AT ROOM TEMPERATURE TO FROM A MIXED RESIN THROUGHOUT SAID COMPONENT, SAID MONOHYDRIC RESIN HAVING AN UNREACTED ALDEHYDE CONTENT INSUFFICIENT FOR ANY RESULTING ACTIVATION OF SAID POLYHYDROXY PHENOL ALDEHYDE RESIN TO CAUSE SUBSTANTIAL CURING OF THE RESIN MIXTURE AT ROOM TEMPERATURE, AND MIXTURE COMPRISING 20-80% BY WEIGHT OF THE POLYHYDROXY PHENOL ALDEHYDE RESIN, POSITIONING THE MIXTURE-IMPREGNATED COMPONENT AGAINST A MOULD SURFCE, COVERING THE IMPREGNATED COMPONENT WITH POROUS MATERIAL AN ELEMENT NON-PERMEABLE TO AIR SAID POROUS MATERIAL AN ELEMENT ANON-PERMEABLE TO AIR AND CAPABLE OF BEING PRESSED AGAINST SAID POROUS MATERIAL BY MEANS OF A PRESSURE DIFFERENTIAL ACROSS SAID ELEMENT, SAID MOULD SURFACE AND SAID ELEMENT AT LEAST IN PART BOUNDING A SEALED CHAMBER, EXHAUSTING SAID CHAMBER TO GENERATE SAID PRESSURE DIFFERENTIAL BY SUCTION THROUGH SAID POROUS MATERIAL, THE IMPREGNATED COMPONENT BEING PRESSED AGAINST THE MOULD SURFACE, APPLYING HEAT TO SAID COMPONENT TO CURE SAID MIXTURE, AND CONTINUING THE EXHAUSTING TO MAINTAIN A DIFFERENTIAL PRESSURE ACROSS THE NONPERMEABLE ELEMENT, THEREBY MAINTAINING THE COMPONENT IN CONTACT WITH SAID MOULD SURFACE AND EFFECTING CONTINUOUS EXHAUSTION THROUGH SAID POROUS MATERIAL OF GASES EVOLVED FROM THE MIXTURE DURING CURING.