GB345676A - Improvements in or relating to the production of mirror glass - Google Patents

Abstract

345,676. Making mirror glass. PILKINGTON BROS., Ltd., 631, Tower Building, Water Street, Liverpool, WALDRON, F. B., Norwood, Eccleston Park, Prescot, and HARRISON, A., The Hollies, Holt Hill Lane, Whiston, both in Lancashire. Dec. 27, 1929, No. 39582. [Class 93.] Relates to apparatus enabling the processes of silvering and coppering in the production of mirror glass to be effected automatically and continuously without the necessity of handling by the operator; in addition, the operations of painting and drying may also be effected automatically and, if desired, continuously with the silvering and coppering. The glass is delivered by a conveyer 1 to the rollers 2 which carry it beneath water sprays 3 and pass it to a cloth band conveyer 7 passing over a heated table 8. The glass is covered by a silvering- solution and the table is of such a length that a sufficient thickness of silver is deposited before the end of the table is reached. The glass is then passed to a band 10 of copper net, chain or thin perforated sheet, or copper plates flexibly joined. The band is depressed, by passing under rollers 12 engaging its edges, into a coppering-solution, the band acting as the cathode, and plates 24 of copper forming the anode. The glass passes to a roller conveyer 13 whereon it is washed by water from sprays 14, and to a slat conveyer 15 which conveys it through a drying-chamber 16, a chamber 17 wherein shellac is sprayed on by sprays 18 movable across the chamber on rails 19, a chamber 20 wherein paint is sprayed from a traversing air brush 21, and through a drying-chamber 22 through which heated air is blown.