METHOD FOR PLASTICIZING CROSSLINKED POLYOLEFIN FOAM

摘要

PROBLEM TO BE SOLVED: To provide a technique for plasticizing a crosslinked polyolefin foam to such an extent that it can be reused by eliminating the adverse effect of a foaming agent remaining in the foam or removing a smell originating from the foam during its extrusion. SOLUTION: This method is to plasticize the crosslinked polyolefin foam obtained by a foaming process using a pyrolitic foaming agent, at a temperature of 300 deg.C or higher of a kneading zone and a shear rate of 400/s or more in the kneading zone with the help of a same-direction rotating biaxial extruder of a screw structure which has a pressure retaining zone for damming or sending back a kneaded product at the end part on the extrusion head side of a single kneading zone.