The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 15, 1991
Filed:
Aug. 16, 1990
Jukka H Vehmas, Tampere, FI;
Esko O Lehto, Kangasala, FI;
Tamglass Oy, Tampere, FI;
Abstract
The invention relates to a method and apparatus for preventing the arching of glass sheets in the roller-equipped furnace of a horizontal tempering plant. In order to equalize the total thermal effect applied to the top and bottom surfaces of a glass sheet, the top surface of a glass sheet is subjected at least at the initial stage of a heating cycle to an intensified convection heat effect by blasting air into the furnace through blasting pipes (3) positioned adjacent to the top surface of a glass sheet. An object of this blasting is to compensate a vigorous heat transfer caused by hot rollers to the bottom surface of a glass sheet in the beginning of a heating cycle. In order to intensify a heat equalization between the opposite surfaces of a glass sheet, the furnace space below a glass sheet is cooled by passing the air to be blown into the furnace into a blasting manifold (3) through a heat-exchange manifold (6) positioned below a bearing surface formed by rollers (2). The air cooling the space below a glass sheet and rollers (2) is pre-heated and, thus, can be used more effectively for intensifying the convection heat effect on the top surface of a glass sheet.