| 摘要 |
At least two sections of molten glass, different after cooling in terms of colour and saturation, are gradually manually poured onto one another into preferentially metal forms in a time interval limited by the period by which the open surface of the molten glass poured into the form cools to the temperature of liquid +/- 20 degrees C. Only then is the second molten glass section poured onto the first molten glass section, different after cooling in terms of colour and saturation, which leads to adhesion of the molten glass layers. A necessary condition for cooling the glass without inner stress is a very close viscosity curve of the glass layers used, defined by the differences between the related points of the viscosity curves, that is +/- 10 degrees C between the dilatometric transformation temperatures, between the temperatures of the dilatometric point of softening and between the temperatures of the Littleton's plasticizing point. For this reason the differences of the medium coefficients of the length of thermal expansivity in a range of 20 to 300 degrees C for all glass used can be up to +/- 0.1 . 10<-6> K<-1>.
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