Film

Film Extrusion can be divided in two types:

Tubular Film

Tubular Film Extrusion Process is the process through which an amount of melted resin is formed in an annular section (tubular), for its stretching and cooling until reaching a solid stage. The resulting product is an annular tube, smashed or collapsed with a thickness below 250 micron, usually between 20 and 150 micron.

When performing an analysis of the processes involved in the extrusion of tubular film, there may be identified the following steps in the process:

• Transport, melting and pumping of resin; stage developed in the extruder;
• Formation of the annular section; stage developed by the header of the extruder;
• Stretching and cooling of the film; stage developed by the stretching unit of cooling system;
• Winding if the film; stage developed by the puller and recollection system.



Plain Film

Contrarily to the process of tubular film, the header is in shape of a slot, which allows the extrusion of material in plain form. The main characteristic of these headers is the existence of a material distributor along the nozzle. The melted polymer flows from the distributor to a slot-type channel.

<See Applications under this process: Foods, Industrial, Drugs and Cosmetics, Construction, Plastics
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