[Zhongbo.com] The powder and clinker with glass composition are melted into the kiln or pool kiln (see glass melting furnace). After melting, it is clarified into a uniform bubble-free, stone-free, streak-free glass. It is further cooled to a viscosity range which is adapted to the requirements of the corresponding molding method, and various molding operations are carried out.
First, blow molding
There are two ways of manual and mechanical blow molding. In the manual molding, the hand-held blow pipe is picked up from the inside of the crucible or the kiln take-up port, and blown into a shape in a metal mold or a wood mold. The smooth circular product is subjected to a rotary blowing method; the surface has a convex or concave pattern or a shape in which the shape is not circular, and the static blowing method is used. First, pick the colorless material and blow it into small bubbles, and then use the small bubble to pick the color material or the emulsified material to blow into a shape called a nesting. The color fusible granules are immersed in the turbid nesting material, and the natural color flow of each color can be blown into a natural ware vessel; the squeegee material is smeared on the color material, and can be blown into a drawing vessel. Mechanical forming is used to blow large quantities of products. After the blowing machine receives the material, the automatic iron mold is blown into a shape, and after the mold is removed, the cap is removed to form a vessel. Press-blow molding can also be used to first punch the material into small bubbles (formation) and then continue to blow into a shape. It has higher efficiency and better quality than blowing with a blowing machine.
Second, press molding
When artificially forming, the artificial picking material is cut into the iron mold, the punch is driven, the shape is pressed into a shape, and the mold is fixed after being fixed. Mechanical molding automation production, large batch size and high efficiency. Press forming is suitable for small-bottomed products such as cups, plates, and ashtrays that can be withdrawn from the punch.
Third, centrifugal molding
The material is received in a rotating mold, and the glass is unfolded and pressed against the mold due to the centrifugal force generated by the rotation, and is taken out after being fixed. Suitable for the molding of large glassware with uniform walls.
Fourth, freeform
Also known as moldless molding. Repeated baking or thermal bonding in front of the kiln by manual picking. Since the glass is not in contact with the mold, the surface of the glass is bright and the shape of the product is smooth. Finished products are also known as kiln glass products.
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