Blown film extrusion is a polymer-extrusion process used to make thin plastic films. A thermoplastic melt, usually a polyethylene grade, is forced through a ring-shaped (annular) die to form a thin tube, and air is blown up the centre of the tube to inflate it into a bubble several times the diameter of the die.
Blown film extrusion is a polymer-extrusion process used to make thin plastic films. A thermoplastic melt, usually a polyethylene grade, is forced through a ring-shaped (annular) die to form a thin tube, and air is blown up the centre of the tube to inflate it into a bubble several times the diameter of the die.
Source: Wikipedia "Blown film extrusion" · CC BY-SA 4.0
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