Manufacture of insulated glass units.

摘要

An insulated glass unit (20) comprises two sheets of glass separated by spacers, a thermosetting resin sealant such as a polysulphide or polyurethane sealant or a hot melt butyl sealant being applied around the edges of the unit to seal the sheets together. Curing or melt-bonding of the sealant is accelerated by the application of microwave energy, suitably by passing the unit through a tunnel (26) with microwave generators (30) on each side thereof. The unit passes through the tunnel on a conveyor (28), held upright by pinch chains (32). The conveyor and pinch chains are made of a nonpolar material such as polypropylene.