SU57702A1 - Method of drawing glass ribbon from molten glass - Google Patents

Description

When stretching, glass by the Furco method, on a conventional boat or a boat with a thermostat, tension is obtained in the sides of the sheet glass, regardless of the thickness of the latter. These tensions arise due to the heterogeneity of temperatures across the entire width of the sheet in the working chamber and in the boat.

Temperature heterogeneity occurs in the working chamber at the moment the boat is immersed in the chamber and further in the process of operation this heterogeneity becomes more and more pronounced.

At the beginning of glass drawing, i.e., after warming up, the glass temperature in the working chamber is uniform, however, with the launch of the Fourcot machine, fresh glass from the brewhouse of the furnace at a different temperature will flow into the working glass. At THIS, in the center, the molten mass of glass has the highest temperature; glass melt, which is closer to the canals of the channel and the walls of the workers, has a lower temperature. In the process of working Mishin Furko temperature difference

more and more increases, because the average flows are more mobile, since they have a higher temperature, and the glass melt, which is located closer to the end walls of the boat, is less mobile; as a result, the speed of movement of the glass is continuously slowed down, with the result that tension is created across the width of the glass ribbon, i.e. in the beads.

In addition to slowing down the glass mass along the end walls of the boat and the camera, the glass mass in these places hardens so much that it becomes impossible to adjust the glass drawing by the boat: it cannot be loaded or lifted, and then the glass tape has to be broken for the so-called upgrade. On this update, the glass ribbon will have a lot of working time (from 5 to 10 hours).

In order to eliminate these drawbacks of drawing glass out of molten glass using a boat of the Fourcot type, according to the present invention, it is proposed that the boat be arranged parallel to the flow of glass mass and the side gaps

between the boat and the walls of the chamber, overlap with refractory plates and supply burners to maintain a uniform glass melt temperature.

The attached drawing shows a section of a working chamber with a Fourco type boat adapted to carry out the proposed method. In the drawing, the following notation is accepted: / - boat body, 2 - lateral thermostats, 5-medium thermostat, 4 - refractory plates to cover the gaps between the boat and the chamber walls, 5 - burners to maintain a uniform temperature of the drawn glass.

The subject matter of the invention.

A method of drawing a glass ribbon from molten glass using a Fourco type boat, characterized in that the boat is arranged parallel to the glass mass flow and the side gaps between the boat and the chamber walls are covered (e.g., with refractory plates) and supplied with burners to maintain a uniform glass temperature.