The production process of glass bottles is a delicate and multi-step process, which mainly includes the following key steps:
1. Raw material pre-processing
Raw material preparation: The main raw materials of glass bottles include quartz sand, sodium carbonate (soda ash), limestone, etc., as well as other auxiliary materials added as needed.
Crushing and drying: crush the block raw materials into appropriate particle size, dry the wet raw materials, and ensure the uniformity and stability of the raw materials.
Iron removal: remove iron from iron-containing raw materials to reduce the impact of iron on the color of glass and ensure the quality of glass.
2. Preparation of batch materials
Mixing: mix the pretreated raw materials evenly according to a certain formula ratio to form a glass batch material.
3. Melting
High temperature heating: send the glass batch material into a pool kiln or pool furnace for high temperature (usually 1550~1600 degrees) heating.
Melting and stirring: the raw materials are gradually melted and mixed into molten glass at high temperature. This process takes several hours, and multiple stirring is required during the period to ensure that the raw materials are fully integrated to form a uniform, bubble-free liquid glass.
4. Molding
Mold design: design and manufacture the corresponding mold according to the shape and size requirements of the glass bottle.
Molding method: Liquid glass is placed in a mold and processed by different molding methods. Common molding methods include manual blowing, mechanical blowing, and extrusion molding. These methods require a high degree of technology and experience to ensure the quality and precision of the glass bottle.
5. Heat treatment
Annealing: The molded glass bottle is gradually cooled at high temperature to eliminate internal stress and avoid cracking. The annealing process is usually carried out on a cooling table with a gradually decreasing temperature and takes several hours.
Quenching (if necessary): In some cases, the glass bottle may be quenched in order to produce specific physical or chemical properties.
6. Post-processing
Finishing and polishing: The cooled glass bottle may need to be trimmed and polished to remove unevenness and defects and ensure the flatness and smoothness of the surface.
Decorative processing: As needed, the glass bottle can be processed by printing, spraying, etc. to increase the aesthetics and product information.
7. Quality inspection and packaging
Quality inspection: Strict quality inspection is carried out on the produced glass bottles to ensure that they meet the design requirements and usage needs.
Assembly and packaging: Qualified glass bottles will be assembled and packaged, ready for shipment or other uses.
In summary, the production process of glass bottles includes raw material pre-processing, batch material preparation, melting, molding, heat treatment, post-processing, quality inspection and packaging. Each link requires delicate operation and strict quality control to ensure that the produced glass bottles have excellent quality and performance.