First, the mold should be designed, determined and manufactured. The glass raw material takes quartz sand as the main raw material, plus other auxiliary materials to melt into liquid at high temperature, and then injected into the mold, cooled, cut and tempered to form a glass bottle. Glazed bottles generally have rigid marks, which are also made of mold shape. According to the manufacturing methods, the molding of glass bottles can be divided into manual blowing, mechanical blowing and extrusion molding. Glass bottles can be divided into the following types according to their composition: one is sodium glass, the other is lead glass, and the third is borosilicate glass.
The main raw materials of glass bottles are natural ore, quartz stone, caustic soda, limestone, etc. The glass bottle has high transparency and corrosion resistance, and the material properties will not change in contact with most chemicals. It has the advantages of simple manufacturing process, free and changeable shape, high hardness, heat resistance, cleanness, easy cleaning, and can be used repeatedly. As a packaging material, glass bottles are mainly used for food, oil, alcohol, beverages, condiments, cosmetics, amber candle jars and liquid chemical products. But the glass bottle also has its disadvantages, such as heavy weight, high transportation and storage cost, impact resistance and so on.
