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Views: 0 Author: Site Editor Publish Time: 2026-02-28 Origin: Site
If one extruder has a new die with a smaller opening by 10%, would the throughput go up or down in the extruder at the same temperatures and screw speed?
A.Throughput goes up because of the increased pressure from the smaller die.
B.Throughput goes down because of the increased pressure from the smaller die.
Select A or B?
Several new technologies are developed to allow for major advances in extrusion technology. The new developments concern the mixing of the polymers with new types of mixing screws. The new mixers allow for better dispersed solids mixing (Rauwendaal, 2002). There are two basic types of extruders: continuous and discontinuous or batch type extruders. Continuous extruders are capable of developing a steady, continuous flow of material, whereas batch extruders operate in a cyclic fashion. Continuous extruders utilize a rotating member for the transport of the material. Batch extruders generally have a reciprocating member to cause transport of the material (Rauwendaal, 2014).
The exit zone has a die that the plastic flows through. The die imparts shape on the material, e.g., rod, tube, sheet, and channel. The exit material is called extrudate. The extrudate swells at the end of the die due to normal forces from the polymer flow, called die swell. This is shown in Fig. 13.9.
