Four steps in the production of glass bottles

- Jun 05, 2020-

Glass bottles are available in various styles, from large bottles to small bottles, and are widely used as packaging containers for food, medicine, beverages, cosmetics, etc.

The glass bottle can be recycled and reused and is a very safe and environmentally friendly packaging container. The production process of glass includes: batching, melting, forming, annealing and other processes.


According to the designed material list, the ingredients of the glass bottle are weighed and mixed in a mixing machine after being weighed. The main raw materials of glass are: quartz sand, limestone, feldspar, soda ash, boric acid, etc.


In the melting of glass bottles, the prepared raw materials are heated at high temperature to form a uniform bubble-free glass liquid. This is a very complicated physical and chemical reaction process. The melting of the glass takes place in the furnace.


The forming of the glass bottle is to transform the molten glass into a solid product with a fixed shape. Forming must be performed within a certain temperature range. This is a cooling process. The glass first changes from a viscous liquid state to a plastic state, and then into a brittle solid state.


During the annealing of glass bottles, the glass undergoes drastic temperature changes and shape changes during the forming process. This change leaves thermal stress in the glass. This thermal stress will reduce the strength and thermal stability of the glass product. The glass bottle factory pointed out that if it is directly cooled, it is likely to rupture itself during the cooling process or later during storage, transportation and use (commonly known as cold explosion of glass).