Writen by: Robert Lerman
Glass Bottle and Glass Jar Manufacturing
Glass bottle and glass jars manufacturing requires control of a great many variables.
The process begins by melting glass in a furnace which melts cullet (crushed, recycled glass), sand, soda ash, limestone, and other raw materials in a temperature range between 2,300 and 2,800 degreesA Refiner distributes the molten glass to the hearth, which makes the temperature of the molten glass uniform.
The molten glass is sheared and cut into uniform gobs.
A distribution system sends the gobs to an Individual Section Forming Machine (IS) that forms the molten gobs into the mold shape. The glass temperature drops in the IS to below 2,100 degrees F.
Glass bottles or glass jars leave the IS and are cooled rapidly by a cooling plate to a temperature level below 900� F.
The glass bottles or glass jars have now passed from liquid to solid form.
The bottles and jars are placed in an annealing lehr, where their temperature is raised
close to the melting point and then gradually lowered again. The reheating and slow cooling eliminates the stress in the bottles or jars and makes them stronger and shock resistant.
A Cold Spray is applied to the exterior coating of the bottles to increase line mobility, reduce abrasions and to maintain the inherent strength of the glass bottles and glass jars.