Plastic laminates usually involve two or more layers of material held together by a polymer. A surface defect on one layer can have a detrimental impact on the final product.

A laminated plastic is defined as one made by bonding two or more sheets or layers held together by a resin. Among a diverse range of applications, it can be used for work surfaces, floorings, and electrical insulation.

The most common form of lamination involves the reinforcing layers being saturated with thermosetting resins. These layers are then bonded together and cured under conditions of heat and pressure. This provides a stronger plastic than the base material, and can be used to introduce desired physical and chemical properties.

Since the laminate is made up of layers, flaws in a single layer can detrimentally affect the overall product. Inspection throughout the process is important, to detect existing defects and to monitor the plastic for any problems introduced during the lamination process. 
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