A low density extruded structural foam of closed cell structure having good compressive strength comprising a engineered thermoplastic resin, alone, or containing a flame retarding agent and/or nucleating agent, optionally combined with a vinyl aromatic resin, and a blowing agent is produced by feeding said resin, or composition, into a primary extruder (2) wherein mixing, adding a blowing agent which is essentially insoluble in the resin at room temperature but soluble in the melt and further mixing, then optionally passing the mixture to a second, cooling extruder (12), passing said extruded mixture through a die (8), then expanding and foaming said composition into a foam article (14).
一种具有良好抗压强度的低密度挤压成型闭孔结构泡沫塑料,由单独的或含有
阻燃剂和/或成核剂的工程热塑性
树脂(可选择与
乙烯基芳香族
树脂和发泡剂结合)和发泡剂组成、 将混合物送入一级挤压机(2)中混合,加入在室温下基本上不溶于
树脂但溶于熔体的发泡剂并进一步混合,然后将混合物送入二级冷却挤压机(12)中,将挤出的混合物通过模头(8),然后将混合物膨胀发泡成泡沫塑料制品(14)。