Polyvinyl Resins for High Pressure Plastic Laminating

The highly reflective surface of high-pressure laminates magnifies any defect due to the core or resulting from pressure inequalities in the pressing operation. Factors that influence telegraphing are: 1) core inequalities, 2) pressure distribution, 3) face strains in the plastic sheet, and 4) glue spread. When the sheet is forced flat in the laminating operation stresses induced in the face distort the melamine sheet to a minor degree over the entire face. This condition can be detected in ordinary light, but it is accentuated when viewed by polarized light. Ready-for-use synthetic adhesives are precise adjustments of adhesive solids, viscosity, and cure time. The qualities the user paid for can be lost in an instant when dilutions other than those recommended by the supplier are tried.

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