POLYOLEFINIC RESIN FOAMED BODY AND PREPARATION THEREOF

摘要

PROBLEM TO BE SOLVED: To make controllable the degree of crosslinking in the direction of the thickness of a sheet when preparing an electron beam-crosslinked polyelefinic resin foam. SOLUTION: The polyolefinic resin foamed body is prepared by irradiating an expandable resin sheet with an electron beam to allow crosslinking to occur and then heat blowing it. Here, the electron beam is applied at least two times wherein the first irradiation has a lower accelerated voltage and the second radiation has a higher accelerated voltage. A polyolefinic resin foamed body is prepared through this process.