[Zhongbo.com] The hot bending of glass is carried out in a hot bending furnace. The glass is cut into the required size and then preheated into the furnace to heat the glass to the vicinity of the softening point temperature for hot bending. Hot bending usually has two methods: molding and gravity sedimentation.
In the production process, it is very easy to appear the mold trace of the hot bending glass, which seriously affects the overall appearance quality of the glass. In order to reduce and avoid the mold trace of the hot bending glass, we should start from the following aspects.
a) When making hot bending dies, the contact edges of the mold and glass must be smoothed, sharp edges removed, high-quality stainless steel materials should be used, and the glass release agent should be sprayed at the contact between the mold and the glass.
b) When using glass, if excessive external force is used to press the glass to help shape the glass, it will cause obvious marks on the glass. Therefore, when the glass is molded, the glass should be controlled by temperature adjustment as much as possible, and the external pair should be minimized. The pressure of the glass is used to shape the glass.
c) It is recommended to spray the glass release agent at the edge of the hot bending mold (especially the edge of the mold supporting the glass gravity).
d) It is recommended to use an open mold for the curved glass with large curvature to reduce the friction of the glass with the mold edge during molding.
e) It is necessary to find out the softening point temperature of the glass by the test through multiple tests (there are differences between different furnaces and different glass sheets of different origins), which requires attention to the technical level of the operator.
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