Liquid ring vacuum pumps and positive displacement blowers in vacuum mode are used in the packaging production, specifically to make proper forms in plastic layers ( i.e. for plastic plates, glasses and wire glands).
Plastic film is turned on turning bars. Turning bars are perforated pipes through which air is blown to create air cushions the plastic film can glide across without coming into contact with the surface.
Plastic welding requires hot air with a temperature of 200 - 300°C which is produced by heating cartridges. Afterwards, the air is accelerated by a side channel blower and discharged through the welding nozzle.