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1. 发明授权

US4071591A Method of manufacturing foamed thermoplastic resin profiles 失效
标题翻译：发泡热塑性树脂型材的制造方法
公开(公告)号：US4071591A
公开(公告)日：1978-01-31
申请号：US603766
申请日：1975-08-11
申请人： Seizo Kobayashi , Toshiharu Hirayama , Takeshi Kamiya , Seiju Kezuka , Hidesuke Takeuchi
发明人： Seizo Kobayashi , Toshiharu Hirayama , Takeshi Kamiya , Seiju Kezuka , Hidesuke Takeuchi
IPC分类号： B29C44/50 , B29D27/00
CPC分类号： B29C47/0042 , B29C44/50 , B29K2023/00 , B29K2025/00 , B29K2105/12 , B29K2105/24 , B29K2309/08 , Y10S264/14 , Y10S264/18
摘要： A method for producing foamed thermoplastic resin profiles with an outer skin layer of increased hardness and an inner foam structure which may be used in place of wooden articles. The outer skin has a smooth surface and a good appearance, and the inner portion enclosed by the skin has a uniform foam structure. Also, with this method an improved foaming efficiency can be obtained. The method comprises a step of melting and kneading a mixture consisting of a thermoplastic resin and a foaming agent without causing the gasification of the foaming agent, a step of heating the melted and kneaded mixture obtained in the previous step to cause the gasification of the foaming agent without agitating the mixture and under a pressure sufficient to supress the substantial foaming of the mixture, thereby forming an expandable melted resin mixture containing microbubbles which are prevented from gathering and uniting, and a third step of causing the melted resin obtained in the previous step to expand while cooling the resin by leading the resin to a foaming die under low temperature and low pressure conditions.
摘要翻译：一种生产发泡热塑性树脂轮廓的方法，其具有增加硬度的外层和可用于代替木制品的内泡沫结构。外皮具有光滑的表面和良好的外观，并且由皮肤包围的内部部分具有均匀的泡沫结构。此外，通过该方法，可以获得改善的发泡效率。该方法包括将由热塑性树脂和发泡剂组成的混合物熔融和捏合而不引起发泡剂气化的步骤，加热在前一步骤中获得的熔融和捏合的混合物以使发泡气化在不搅拌混合物的条件下，在足以抑制混合物的大量发泡的压力下，形成包含防止聚集和结合的微泡的可膨胀熔融树脂混合物，以及第三步骤，使上一步骤中获得的熔融树脂通过在低温低压条件下将树脂引入发泡模具来冷却树脂。

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