Abstract: A method of manufacturing a powder-coated glass product. The method comprises depositing thermosetting powder on the upper most first surface of the glass substrate and curing the thermosetting powder to form a coating on the first surface. The curing step comprises applying heat via infra-red radiation located below the second surface of the glass substrate and via the second surface of the glass substrate. The source of infra-red radiation comprises a box having an internally-reflective surface and a heat-transmissive lid located below the second surface of the glass substrate. At least one infra-red lamp is located within the box to emit the infra-red radiation into the box, and the infra-red radiation emitted into the box heats the air within the box for conduction of heat from the air through the lid to the second surface across the gap between the lid and the second surface of the glass substrate.
Abstract: A powder-coated glass panel in which print (5) on the back (4) of a transparent polyester coating (2) carried by a glass sheet (1), is covered by an epoxy coating (6), and the longitudinal margin (9) of metal foil (7) covering the edges of the panel overlaps onto the back of the coating (6) to relieve thermal stress in the sheet (1). Heat to melt and cure the powders forming the coatings (2, 6) and to cure the printing ink (5) is applied through the sheet (1) from infra-red lamps (22) mounted within an internally-reflective trough (23). The frequency of the radiation is varied from high to low during heating. A double-glazed spandrel unit includes the panel (31) mounted with spacing behind a facing-sheet (32), and with metal foil (34) covering the edges of the unit and overlapping marginally (37) onto the back (38) of the panel (31) for thermal-stress relief.
Abstract: Foaming of a resinous backing (2) to a glass sheet (1) is frustrated at the interface (3) with the glass by maintaining the glass sheet (1) cool during formation of the foam. The degree of foaming is nil at the interface (3) to effect a strong bond there, and increases progressively through the thickness of the foam body (2) away from the interface (3). The foam body (2) is backed by glass-fibre cloth (4) that is impregnated with the resin from which the foaming gas has been vented so as to bond the cloth (4) to the body (2) and to an outer aluminium foil (5). The glass sheet (3) may be a mirror, and may be replaced by a glass laminate (20;23) that includes a fused-powder coating (22;25) with or without an aluminium foil backing.
Abstract: Coating (1,2) on a glass substrate (3) are formed by laying down layers of different thermosetting materials one upon the other in powder form on surface (4). The powder of transparent coating 1) has a higher-cure rate than that of color coating (2) so that when heat is applied, coating (2) remains in the melt condition while the coating (1) hardens, to bond with and enable rolling out onto coating (1), as well as bonding with a backing (5). Materials of different cure-rates are also used for bonding substrates together by bringing the two materials together while one is partly-cured and the other in the melt condition.
Abstract: A panel having a glass substrate (1), carries a transparent polyester powder-coating (2) with images (5) printed on its back surface (4) for viewing through the glass. A colored polyester powder-coating (6) covers printed surface (4) and is backed by metal foil (7). Manufacture involves heating polyester powder deposited on a silane-treated surface (3) of the glass (1), to form the coating (2) about 70% cured. Images (5) are printed on surface (4) using a color-separation process with ink having u.v.—and thermo-curing properties, the ink being u.v. cured after each printing step of the process. Heat applied to cure polyester powder of coating (6), also thermo-cures the ink (5) and completes curing of coating (2). The foil (7) is brought into contact with the melted powder of coating (6) to bond it to the coating (6).