Details of glass bottle production process
1 - Raw materials for glass bottle manufacturer
Most of the raw materials used to make glass bottles are sand, soda ash and limestone. Crushed glass is added to this mixture. Crushed glass is broken glass, whether it is waste from the manufacturing process or waste from recycling centers, saving 1300 pounds of sand, 410 pounds of soda ash and 380 pounds of limestone for every ton of glass recycled. This saves on manufacturing costs, cost and energy savings, and allows customers to get an economical price on our products.
2 - Melting raw glass bottles in a furnace
The raw material and broken glass are continuously melted at high temperatures, around 1650°C. The furnace runs 24 hours a day and the raw material mixture forms molten glass in about 24 hours. The molten glass is passed through the
The glass is then cut into pieces by weight at the end of the forehearth, where the temperature is precisely set.
3 - Glass bottle/jar forming
Two forming methods are applicable: press-blowing or blowing, performed in the IS machine
Press-blown glass bottles
The cut drops fall and are pressed into a blank mold with a metal plunger, where it expects the shape of the mold, which is then called the profile blank. Next, the blanks are moved into the final mold and blown into the mold for final measurements. This process is typically used for wide-mouth glass bottles, but can also be used to produce fine necked glass bottles.
Blown Glass Bottles
Cut drops of material fall and are compressed into the blank mold in blow blow molding, using compressed air to push the drops into place, called a profile blank, which moves to the final mold to be blown again to form the inside of the framed glass bottle. Glass bottles with different neck thicknesses (narrow containers) can be manufactured using a blow-blow arrangement.
4-Annealing in glass bottle manufacturing process
Regardless of the process, blown glass containers are usually surface coated after they are formed.
While they are still hot, in order to make the bottles and jars more scratch resistant, this is called hot end surface treatment, and then the glass bottles are taken to an annealing furnace where their temperature returns to about 815 °C and then decreases gradually to below 480 °C. This will take about 2 hours. This reheating and slow cooling removes the pressure from the container. This enhances the robustness of the naturally occurring glass containers. Otherwise, the glass can easily break.
5 - Glass bottle quality inspection
Before inspection, they are usually surface coated at the cold end to reduce the temperature of the glass container to about 100°C, otherwise the glass is easily scratched.
After leaving the cold end of the annealing furnace, to ensure product quality, we use Led beam technology (Led inspection), Camara inspection machines, and integrated inspection machines to detect faults that are not visible to the naked eye. These include, but are not limited to: seal face inspection, dimensional analysis, wall thickness inspection, breakage detection, bottom side scan, and wall scan. Any non-compliant bottles will be automatically rejected and these rejected bottles will be re-melted and re-used as raw material. Automated inspection will ensure consistent quality for our customers.