Moulding process
Abstract
Abstract A METHOD OF PRODUCING DECORATED THERMOSET POLYESTER MOULDINGS BY A TWO-STEP PROCESS, WHEREIN THE FIRST STEP COMPRISES SHAPING, IN A MOULD AND UNDER HEAT AND LOW PRESSURE, A THERMOSETTING UNSATUREATED POLYESTER MOULDING COMPOSITION, PREFERABLY A NIL OR LOW-SHRINKAGE TYPE, HAVING APPLIED THERETO AN UNIMPREGNATED DECORATION SHEET OF PAPER-LIKE MATERIAL WHEREBY THE DECORATION SHEET IS PARTLY IMPREGNATED WITH POLYESTER RESIN FROM THE MOULDING COMPOSITION AND THE MOULDING COMPOSITION IS AT LEAST PARTIALLY CURED SO THAT THE DECORATION SHEET ADHERES TO THE SURFACE OF THE MOULDING, AND WHEREIN THE SECOND STEP COMPRISES APPLYING THERMOSETTING RESINOUS MATERIAL TO THE SURFACE, THE DECORATION SHEET AND REAPPLYING HEAT AND PRESSURE TO CAUSE THE RESINOUS MATERIAL TO FLOW OVER THE SURFACE, COMPLETE IMPREGNATION OF THE DECORATION SHEET AND CURE, AND TO COMPLETE CURING OF THE MOULTING COMPOSITION; THE THERMOSETTING RESINOUS MATERIAL PREFERABLY IS A POLYESTER RESIN OR A SURFACE FINISHING MATERIAL SUCH AS MELAMINEFORMALDEHYDE RESIN.
Inventors
- 👤 N Nicklin
Bibliographic Details
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