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Glass industry

With the development of technology, vacuum has been widely used in the glass industry, frequently used for glass coating, glass transport and production of glass bottles.

Float glass production line
To complement the blowing process forming the inside of the bottle, vacuum is applied outside (through the mould) to the bottom of the bottle providing a variety of benefits to the customer including reduced operating costs and faster machine through put (the mould is filled more quickly when vacuum is applied). This also applies to the more specialist areas of glass container production where fine detail and sometimes intricate designs are involved or where the consistency of thickness of the glass is critical.

Glass bottles that need to withstand substantial internal pressures, it is necessary to control the glass thickness within a quite tight tolerance at critical points so as to provide the necessary strength and pressure rating.
 
At present, Atlas Copco has supplied ISO 8573-1 Class 0 oil-free compressed air for the traditional glass industry. Usually, what blows raw material into the mold is only clean compressed air at a pressure of 3 bar. By now, more and more plants have applied vacuum to the fixing and molding process, which can largely improve production speed and manufacturing accuracy.
 
The technology is also used for manufacturing glass pot to store preserved food and multi-mouth containers in the food industry.
 
Usually, production processes related to vacuum, like the above examples, can produce glass products with better surface and custom patterns.