Question

Compression ratios for single screw extrusion should lie between ____ and ____

(a) 2:1, 3:1

(b) 1:2, 4:1

(c) 2:1, 4:1

(d) 1:2, 1:3

The question was asked in my homework.

I'm obligated to ask this question of Extrusion and Calendering in Thermoplastics in chapter Thermoplastic Polymers Properties & Processing of Food Packaging Technology

Answer 1

Right answer is (c) 2:1, 4:1

For explanation: Compression ratios for single screw extrusion should lie between 2:1 and 4:1. Compression ratio is an important parameter for any extrusion process. Compression ratio is the ratio of the volume of one flight of the screw at the in-fees end to the volume of one flight at the die end.