Hot pressure bonding of plastics, e.g. transparent acrylic parts, involves coating the surface of the components with lower softening point material

摘要

Flat composite plastic parts are made by bonding of components under heat and pressure. The components consist of a base material 1 to 200 mm thick with a surface coating 5 to 400 mu m thick. The Vicat softening temperature of the surface coating material is 5 to 40 [deg]C below that of the base material. During bonding the components are heated to 5 - 30 [deg]C above the softening temperature of the coating. An independent claim is also included for articles made by this process, with the bonded surface comprising at most 90% of the whole part and component thickness 25% of whole part. The bonded surface can contain engravings, e.g. 1 mm deep, to obtain three-dimensional enclosures.