Abstract: Batch and continuous extrusion processing methods in open-cell foaming with inert gases as physical blowing agents arc summarized. Temperature, pressure, time and blowing agents concentration in foaming processing are important factors on the open-cell structure. The basic principles conformed in these different processing methods arc presented.Some factors influencing the behavior of opening and methods increasing open-cell content are analyzed. It was proposed that the electromagnetism dynamic processing will be one of the major methods in the open-cell foaming.

Key words: microccllular plastic, open cell, physical blowing agent, electromagnetism dynamic processing