Method for injection molding of molded parts of thermoplastic material
    1.
    发明授权
    Method for injection molding of molded parts of thermoplastic material 失效
    热塑性塑料成型件的注射成型方法

    公开(公告)号:US6019935A

    公开(公告)日:2000-02-01

    申请号:US416692

    申请日:1996-04-19

    IPC分类号: B29C45/00 B29C45/17 B29C45/26

    CPC分类号: B29C45/1704 B29C2045/173

    摘要: Proposed is a process for injection molding of products (1) made of thermoplastic material, whose walls (2) enclose a hollow space (3), wherein the molten plastic is injected in a predetermined amount into the cavity or molding nest (6) of a mold (5), during and/or upon which a fluid pressure medium (gas) is applied so that with the formation of the hollow space the molten plastic is distributed along and set against the walls of the cavity or molding nest. The pressure medium (gas) is fed into the cavity or molding nest (6) and into the molten plastic at first essentially only in the direction of flow of the molten plastic and in a quantity and/or at a pressure that causes a void (8) to form within the molten plastic, terminating at a distance from the end of the flow path. Then, with a time lag, more pressure medium (gas) at a higher or increased level of pressure is fed into the cavity and the molten plastic from the end of the flow path for the molten plastic and essentially counter to the direction of flow of the molten plastic, forming a second void (11) which joins with the already existing void (8).

    摘要翻译: PCT No.PCT / EP93 / 02694 371日期:1996年04月19日 102(e)日期1996年4月19日PCT提交1993年10月1日PCT公布。 公开号WO94 / 08773 日期1994年4月28日提出了一种注射成型热塑性材料制品(1)的方法,其中壁(2)包围中空空间(3),其中熔融塑料以预定量注入空腔或成型 在模具(5)的嵌套(6)中,在施加流体压力介质(气体)期间和/或在其上施加流体压力介质(气体),使得随着中空空间的形成,熔融塑料沿空腔的壁分布并抵靠空腔壁, 成型巢。 压力介质(气体)首先基本上仅在熔融塑料的流动方向上以一定量和/或在导致空隙的压力(或压力)下被馈送到空腔或模制座(6)中并进入熔融塑料 8)在熔融塑料内形成,在距离流动路径的端部一定距离处终止。 然后,随着时间的推移,在较高或增加的压力水平下的更多的压力介质(气体)从熔融塑料的流动路径的端部被供给到空腔中并且熔融塑料基本上与流动方向相反 形成与已经存在的空隙(8)连接的第二空隙(11)。