This die is the simplest shape that can be produced. Its circular cross-section will produce circular lines, like weed trimmer line or fishing line.
A tubing die is a little bit more complicated. It has a donut-shaped cross-section to make pipe and tubing.
This die is called a clothes hanger die, and will produce sheet or thin film. The cross section shows how the molten plastic from the extruder is spread out to produce a wide, thin sheet. In general, a product is considered sheet if it is thicker than 0.1mm (0.004"), and film, if it is thinner than 0.1mm (0.004"). However, these terms are sometimes used interchangably.
We have just finished going over the fundamentals of extrusion. Next, we will learn about the specific type of extrusion used to produce coextruded flat films.
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