A NEW APPROACH FOR THE INJECTION OF PHYSICAL BLOWING AGENTS IN FOAM EXTRUSION

摘要

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, CO_2 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.