压制玻璃（Pressed glass）.docVIP

压制玻璃（Pressed glass） The ingredients, according to the design of the material square sheet, the various ingredients are weighed and mixed in a mixing machine. The main raw materials of glass are: quartz sand, limestone, feldspar, soda, boric acid etc. 2. The melting system shall be heated by high temperature to form a uniform non-sparkling glass solution. This is a very complicated physical and chemical reaction process. The melting of glass is carried out in the kiln. There are two main types of melting kiln: one is crucible kiln, and the glass is placed inside the crucible and heated outside the cauldron. The small crucible kiln has only one cauldron, which can be as large as 20 cauldrons. The crucible kiln is produced in gap form, and now only optical glass and color glass are produced by crucible kiln. The other is the pool kiln, the glass is made in the kiln, the flame is heated on the surface of the glass. Most of the glass temperature of the melted in 1300 ~ 1600 ゜ c. Most of them are heated by flame and a small amount of electric current is heated, which is called an electric furnace. Now, the pool kiln is continuously produced, small pond kiln can be several meters, large can be large to more than 400 meters 2. 3. Forming is to transform molten glass into solid products with fixed shape. Forming must be done within a certain temperature range. This is a cooling process. The glass is first converted from a viscous liquid to a plastic state and then into a brittle solid. Forming methods can be divided into two categories: artificial forming and mechanical forming. A. artificial forming. There is also (1) blowing, with a nickel-chromium alloy blowpipe, a glass of glass in the mold side of the edge blowing. It is mainly used for forming glass bubble, bottle, ball, etc. (2) pull the system. After the blister is blown, the other worker is glued to the top, and the two men blow and pull mainly to make glass tubes or rods. (3) suppress, select a piece of glass, cut