PRODUCT PACKAGING

摘要

A product such as meat or a ready meal (12) is packaged in a tray (14) of aluminium foil coated with a polymeric material, covered with a cover film (34), these being bonded together by dielectric heating between opposed electrodes (18, 24). The film (34) may be of laminated form, for example comprising a polymer such as APET laminated to a bonding layer of polyethylene. This welding process avoids heat wastage, it can provide narrower seals, and enables a good seal to be obtained despite contamination of the surface of the tray.