MOLDING OF GLASSWARE

• Main Author: SHIBAOKA KAZUO
• Format: Patent
• Language: English
• Published: 07.09.1987
• Subjects: CHEMISTRY; GLASS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL

PURPOSE:In the production of glassware products having flat surfaces as parts by vacuum molding, a glass plate is uniformly heated at low temperature, then the parts other than parts of flat surfaces are locally heated to permit the above-stated glassware products without flaws. CONSTITUTION:A glass plate 4 is uniformly heated at temperature between it strain point and 100 deg.C lower than the strain point in the uniformly heating zone I in the furnace 1. Then, the plate is transferred into the electric heating zone II where the plate is locally heated by charging the conductive material 11 on the mold the other conductive material 12 on the parts to be deformed with electricity. When the viscosity of the glass plate lowers 8 or less as log the plate is sent to the molding zone III where the mold 2 is evacuated inside to allow the glass plate 4 to contact closely with its inside walls whereby the plate is formed into a prescribed shape. The molded plate is cooled down in the cooling zone IV and take out of the furnace. The process according to the present invention can heat locally the parts to be deformed sufficiently and distinctly from other parts to mold the plate without flaws on its flat surfaces.