abstract |
A LAMINATE OF SYNTHETIC POLYMERIC MATERIALS IS PRODUCED BY AN INJECTION MOULDING PROCESS IN WHICH THE FIRST LAYER OF THE LAMINATE IS INJECTED THROUGH A FIRST SPURE TO FILL THE MOULD CAVITY WHICH IS THEN ENLARGED AND A SECOND AMOUNT OF MATERIAL IS INJECTED INTO THE MOULD THROUGH A SECOND SPURE WHICH EXTENDS THROUGH THE FIRST LAYER. ONE OF THE CHARGES, PREFERABLY THE SECOND, MAY CONVENIENTLY BE OF FOAMABLE MATERIAL. |