Patent ID: 6513347
Filing Date: 2003-02-04
Classification: C03C

Abstract:
A process for heat conditioning at least one glass substrate for subsequent surface treatment by at least one vacuum process, comprising the steps of:introducing said substrate into a chamber; having said chamber evacuated before said introducing or evacuating said chamber after said introducing; predetermining the spectral absorption characteristics of said substrate in the infrared spectral band, including its lower slope where absorption rises with increasing wavelength; selecting at least one lamp with a radiation spectrum band overlapping said absorption spectrum of said substrate at least along at least one of a predominant part of said slope and at longer wavelengths; exposing said substrate in said evacuated chamber to radiation from said lamp directly via the evacuate atmosphere of said chamber, and cooling said workpiece within said chamber by introducing a heat conductive gas into said chamber to achieve heat conductance from said substrate to the wall of said chamber.