Single-screw extruder standard sizes

Standard sizes of single-screw extruders are I /i, 2, 2 /i, 3 /, 3 /i, 4 /2, 6, and 8 in., which denote the inside diameter (ID) of the barrel. As a rough guide, extruder capacity Q , in pounds per hour, can be calculated from the barrel diameter in inches, by the empirical relation [15]... 

A new injection technique for introducing physical blowing agents into molten polymer is studied for its application in foam extrusion. Therefore, a special injection device is mounted on a standard laboratory scale single screw extruder. By means of this device, CO2 is injected into PS melt. In this paper first results of these preliminary tests are shown. The foams produced with this new technique exhibit a cell size in the range of 100 microns. 

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