Blow Film is the process used for making thin films products like plastic bags.
Molten material that comes out of the extruder enters a tubular die. Air is blown into the die which expand and stretches the material like blowing a balloon. This blown up material is called a film tube. The air flow pushes the tube upwards as it expand and cool. From there, it enters a sizing basket made up of small rollers to regulate the size and shape of the tube. The tube is then forced to form a flat sheet by the collapsing guides. The nip rolls presses the sheet and acts to pull the tube upwards in the entire process. The folded tube then travels down a series of rollers before it is being wind-up into rolls.
The rolls are taken to a cutting machine where it will be cut and sealed to the desired size as bags.
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