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1. 发明授权

US5645786A Method of manufacturing a multilayer molding 失效
标题翻译：多层成型体的制造方法
公开(公告)号：US5645786A
公开(公告)日：1997-07-08
申请号：US677193
申请日：1996-07-09
申请人： Haruo Okada , Hidemi Aoki , Yasuhiko Takeuchi , Kunio Yuhara
发明人： Haruo Okada , Hidemi Aoki , Yasuhiko Takeuchi , Kunio Yuhara
IPC分类号： B29C45/16 , B29C45/23 , B29L9/00
CPC分类号： B29C45/1603 , B29C45/1642 , Y10S264/57
摘要： An improved method of manufacturing a multilayer molding having a core and a surface layer by means of a double nozzle structure can eliminate a damaging phenomenon of producing a mixture of a resin material for forming the core remaining in and out of the aperture of the inner nozzle of the double nozzle structure and a resin material for forming the surface layer in the initial stages of molding operation by effectively driving back the remaining resin into the inner nozzle. A double nozzle structure that can suitably be used with such a method includes a shut-off pin arranged in the inner nozzle disposed at the center of the outer nozzle. The resin material for forming the core is driven out simultaneously with the resin material for forming the surface layer coming from the outer nozzle. The operation of resin injection from the inner nozzle is terminated at an arbitrarily selected moment during the operation of injecting the resin material for the surface layer of the outer nozzle. Then, the inside of the inner nozzle is brought into a no-load condition while the shut-off pin is held to its open position. Thereafter, the remaining resin material for the core found in and out of the aperture of the inner nozzle is driven back into the inner nozzle by the pressure of the resin injected from the outer nozzle. Finally, the inner nozzle is closed by the shut-off pin and the injecting operation of the outer nozzle is terminated.
摘要翻译：通过双喷嘴结构制造具有芯和表面层的多层模制品的改进方法可以消除产生残留在内喷嘴孔内的芯的树脂材料的混合物的损坏现象的双喷嘴结构的树脂材料和用于在成型操作的初始阶段形成表面层的树脂材料，通过有效地将剩余的树脂驱回到内部喷嘴中。可以适当地使用这种方法的双喷嘴结构包括布置在设置在外喷嘴的中心的内喷嘴中的切断销。用于形成芯的树脂材料与用于形成来自外部喷嘴的表面层的树脂材料同时被驱除。在喷射外部喷嘴的表层的树脂材料的操作期间，从内部喷嘴进行的树脂注入的操作在任意选择的时刻终止。然后，在关闭销保持在其打开位置的同时，使内部喷嘴的内部进入空载状态。此后，通过从外部喷嘴喷射的树脂的压力，发现在内部喷嘴的孔内的剩余的用于芯的树脂材料被驱回到内部喷嘴中。最后，内部喷嘴被关闭销关闭，并且外部喷嘴的喷射操作终止。

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