How are common glass bottles made? I didn’t expect the process to be so complicated

Glass bottles can be seen everywhere in life. It is made of glass made of an amorphous inorganic non-metallic material. Glass: A relatively transparent solid substance that forms a continuous network structure when it is melted. During the cooling process, the viscosity gradually increases and hardens without crystallizing silicate non-metallic materials. The composition of ordinary glass chemical oxide (Na2O·CaO·6SiO2).

glass bottle

The glass bottle production process mainly includes:

①Pre-processing of raw materials. Crush the bulk raw materials (quartz sand, soda ash, limestone, feldspar, etc.) to dry the wet raw materials, and remove iron from the iron-containing raw materials to ensure the quality of the glass.

② Preparation of batch materials.

③Melting. The glass batch material is heated at a high temperature (1550~1600 degrees) in a tank kiln or a crucible kiln to form a uniform, bubble-free liquid glass that meets the molding requirements.
④Forming. The liquid glass is processed into products of the required shape, such as flat plates, various utensils, etc., commonly known as abrasive tools.

⑤ Heat treatment. Through annealing, quenching and other processes, the rationale is to eliminate or generate stress, phase separation or crystallization within the glass, and to change the structural state of the glass. Glass bottles generally have a rigid logo, and the logo is also made of a mold shape. According to the manufacturing method, the molding of glass bottles can be divided into three types: manual blowing, mechanical blowing and extrusion molding. Cut and temper to form a glass bottle.

⑥The glass bottle has undergone drastic temperature changes and shape changes during the molding process, and this change leaves thermal stress in the glass. Such thermal stress will reduce the strength and thermal stability of the glass product. If it is cooled directly, it is likely to rupture on its own during the cooling process or later during storage, transportation and use. In order to eliminate the phenomenon of cold burst, the glass product must be annealed after being formed. Annealing is to keep the temperature in a certain temperature range or slowly cool down for a period of time to eliminate or reduce the thermal stress in the glass to the allowable value. In addition, some glass products can be stiffened in order to increase their strength. Including physical rigidization (quenching), used for thicker glasses, desktop glass, car windshields, etc.; and chemical rigidization (ion exchange), used for watch cover glass, aviation glass, etc. The principle of stiffening is to generate compressive stress on the surface of the glass to increase its strength.
Before the production of beautiful glass wine bottles, there are piles of quartz sand, soda ash, limestone, borax and other minerals. After the above process, if there are colorful patterns on the glass bottles, there are many processes, in the blowing of glass bottles. After molding, spraying and glazing, and finally labeling and baking flowers, can be packaged and shipped to the manufacturer. Is the production process of glass bottles still more cumbersome, and the details are very important, otherwise it will seriously affect the quality of the glass bottles.

Post time: Dec-23-2021