Resin pellets are fed through a hopper into an extruder.

Here, heat and friction convert the pellets to a hot molten resin, which is forced through an annular or ring-shaped die to form a tube.

The tube is inflated to increase its diameter and decrease the film gauge / thickness.

At the same time, the tube is drawn away from the die by the nip rollers, which also decreases its gauge.

The tube, also called a "bubble", is then flattened by collapsing frames; drawing it through the nip roller and over supporting rollers.

It then enters a winding station, which produces the finished reels of film either in a lay flat tube form or as single slit webs.

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