At present, the main production methods of ultra-thin glass include float method, overflow method, slit method and secondary method.
The float method is mainly to melt, clarify and cool the glass liquid into the tin tank through the flow channel under the control of the regulating ram smoothly and continuously, floating on the surface of molten metal tin liquid, the glass liquid into the tin tank after being smoothed under the action of gravity, polished under the action of surface tension, floating forward under the action of the main drive pull gravity, and realize the processing and thinning of the glass belt under the action of the edge pulling machine. Form ultra-thin glass.
Overflow underdrawing is a hot technology in the manufacture of ultra-thin glass. The overflow downpour method mainly infuses the molten glass into the wedge overflow groove to make the molten glass overflow from the overflow groove, and then pulls down the integrated molten glass below the overflow groove to make ultra-thin glass.
The outer surface of the glass strip produced at the end of the method is not in contact with any solid or liquid except with the air, that is, no trough brick, lead brick, steering roller, no tin groove, no grinding and other processing; In the forming process, the flow of glass molten liquid is parallel to the two sides of the glass belt formed by it, which is conducive to the installation of temperature regulation devices on both sides of the glass belt, in order to eliminate the uneven glass surface, improve the quality of the glass surface.
The slit down-draw method mainly introduces molten glass into a tank made of platinum-rhodium alloy, flows out from the slit at the bottom of the tank, and draws it into ultra-thin glass by using its own gravity and downward pulling force. The thickness of the glass prepared by this process can be controlled according to the drawing amount of the furnace, the size of the slit and the pull-down rate, and the warping degree of the glass can be controlled according to the uniformity of the temperature distribution, so that ultra-thin glass can be produced continuously.
The preformed glass raw billet prepared by the float process is wound on the cylindrical winding roller, and the glass base material is transported vertically downward. The glass is heated to the softening point by the heating device, and the softened glass substrate is extended downward to prepare ultra-thin glass.