The main production process of glass bottles
The production process of glass bottles mainly includes:
① Raw material pre-processing. Crush the block raw materials (quartz sand, soda ash, limestone, feldspar, etc.), dry the wet raw materials, and remove the iron-containing raw materials to ensure the quality of glass.
② Preparation of batch materials.
③ Melting. The glass batch materials are heated at high temperature (1550~1600 degrees) in a pool kiln or pool furnace to form a uniform, bubble-free liquid glass that meets the molding requirements.
④ Molding. Put the liquid glass into the mold to make glass products of the required shape, such as flat plates, various utensils, etc.
⑤ Heat treatment. Through annealing, quenching and other processes, the stress, phase separation or crystallization inside the glass is cleaned or generated, and the structural state of the glass is changed.
Main raw materials and characteristics of glass bottles
First, the mold must be designed, determined and manufactured. The glass raw material is quartz sand as the main raw material, and other auxiliary materials are melted into liquid at high temperature, then injected into the mold, cooled, cut and tempered to form a glass bottle. Colored glass bottles generally have rigid marks, which are also made in the shape of the mold. The molding of glass bottles can be divided into three types according to the production method: 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 second is lead glass, and the third is borosilicate glass.
The main raw materials of glass bottles are natural minerals, quartz stone, caustic soda, limestone, etc. Glass bottles have a high degree of transparency and corrosion resistance, and the material properties will not change when in contact with most chemicals. Its manufacturing process is simple, the shape is free and changeable, the hardness is high, it is heat-resistant, clean, easy to clean, and has the characteristics of being reusable. Glass bottles are mainly used as packaging materials for food, oil, wine, beverages, condiments, cosmetics and liquid chemical products, etc., and have a wide range of uses. But glass bottles also have their disadvantages, such as being heavy, high transportation and storage costs, and lack of impact resistance.