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    • 10. 发明授权
    • Apparatus for fluid compression of injection molded plastic material
    • 注射成型塑料材料的流体压缩装置
    • US5439365A
    • 1995-08-08
    • US262342
    • 1994-06-20
    • James W. Hendry
    • James W. Hendry
    • B29C45/17B29C45/16
    • B29C45/174B29C2043/566B29C2045/1741
    • A mold apparatus and method is used to form a solid injection molded plastic part having no internal voids, a Class A finish, a sink-free exterior appearance surface, and unevenly distributed structural detail extending from the opposite surface, the detail including free-standing reinforcement ribs, attachment bosses, and the like. A charge of hot melted thermoplastic and pressurized gas are sequentially injected into a mold cavity defining the shape of the desired part, the plastic not filling the cavity and being simultaneously received in shaped recesses and grooves which form the structural detail. The pressurized gas forces the hot plastic from one mold half against the other mold half, and into the recesses and grooves, and is maintained during cooling. A gas seal is formed by the plastic to prevent gas in the mold cavity from reaching the finished exterior surface of the part during shrinkage of the plastic. Gas inlets and plastic volume areas cooperate with rib forming chambers to enhance resin distribution in the cavity. Importantly, the gas can be reclaimed, such as for recirculation and cooling.
    • 使用模具设备和方法来形成没有内部空隙的固体注射成型塑料部件,A类涂层,无凹槽的外观表面,以及从相对表面延伸的不均匀分布的结构细节,该细节包括独立的 加强肋,附接凸起等。 热熔化的热塑性和加压气体的装料被顺序地注入限定所需部分形状的模腔中,塑料不填充空腔并同时容纳在形成结构细节的成形凹槽和凹槽中。 加压气体迫使来自一个半模的热塑料抵靠另一个半模,并且进入凹槽和凹槽,并在冷却期间保持。 气体密封由塑料形成,以防止模具腔中的气体在塑料收缩期间到达零件的最终外表面。 气体入口和塑料体积区域与肋形成室配合以增强腔体中的树脂分布。 重要的是,可以回收气体,例如再循环和冷却。