JACKING FORCE-TRANSMITTING MATERIAL, JACKING PIPE PROVIDED WITH SAME, AND MOLD FOR FOAM-MOLDING JACKING FORCE-TRANSMITTING MATERIAL

摘要

As a thrust transmitting material interposed between the propulsion tube in the promotion process , great stress , sudden stress concentration , and even hayeoteul complex stress is applied , which allows you to effectively avoid the damage resulting from a propulsion tube , more superior cushioning performance gets re- thrust transfer. A thrust transmitting member polystyrene-based foam is obtained by the thrust transmission member made of a foamed particle type in the composition according to the present invention , a density of 0.17~0.67g / cm ³ , and the average cell diameter is 60 The below . ;