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METHOD OF ADMINISTRATION OF A LIGHT FILE OF POLYPROPYLES OR ETHYLEEN PROPY LEENCOPOLYMER AND A DEPARTMENTAL FILE.
METHOD OF ADMINISTRATION OF A LIGHT FILE OF POLYPROPYLES OR ETHYLEEN PROPY LEENCOPOLYMER AND A DEPARTMENTAL FILE.
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机译:管理聚丙烯或乙基丙烯基乙烯共聚物的轻型档案和部门档案的方法。
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摘要
Expanded polypropylene or ethylene propylene copolymer sheets are made by extruding a compsn., comprising polypropylene, a blowing agent and a nucleating agent, through a sheet die without cooling on leaving the die. The sheet may be compacted lightly through rollers after extrusion to give a smooth surface. The new sheets are generally 0.7-1.3 mm.thick, with a density of 0.65-0.75, and are esp. useful for vacuum forming. The sheets have improved tensile strength and high chemical inertness.
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