A procedure for the production of a foamed sheet of an ethylene polymer. (Machine-translation by Google Translate, not legally binding)

摘要

A process for the production of a foamed sheet of an ethylene polymer, comprising making a sheet or tube of a cross-linked ethylene polymer, containing an organic, normally solid, blowing agent capable of releasing gases by decomposition by heating, fall down through a heating station, heat the sheet or tube during its passage to a temperature above the softening temperature of the cross-linked ethylene polymer, and higher than the decomposition temperature of said organic expanding agent, to foam thus said sheet or tube, the heating being carried out by first preheating to a temperature below the decomposition temperature of said expanding agent, and then rapidly heating to the foaming temperature, to ensure a minimum degree of fluctuations in the thickness of the sheet or tube, and stretch the foamed sheet or tube in one direction n transverse to the direction of movement, sufficient to eliminate wrinkles formed in the sheet or tube at the time of foaming degree. (Machine-translation by Google Translate, not legally binding)