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    Method of compression molding a thermoplastic article with walls of variable thickness
    17.
    发明授权
    Method of compression molding a thermoplastic article with walls of variable thickness 失效
    具有可变厚度的热塑性制品的压缩成型方法

    公开(公告)号：US3670066A

    公开(公告)日：1972-06-13

    申请号：US3670066D

    申请日：1969-11-10

    Applicant: VALYI EMERY I

    Inventor： VALYI EMERY I

    IPC: B29C31/04 ,  B29C31/06 ,  B29C43/34 ,  B29C43/42 ,  B29C43/54 ,  B29C3/00 ,  B29C17/14 ,  B29F1/00

    CPC classification number: B29C43/34 ,  B29C31/048 ,  B29C31/06 ,  B29C43/42 ,  B29C43/54 ,  B29C2043/3283 ,  B29C2043/3433 ,  B29C2043/3444 ,  B29C2043/3615 ,  B29C2043/5883 ,  B29L2031/712

    Abstract: A method for molding articles having variable thickness walls from thermoplastic material. An amount of plastic slightly in excess of that required to fill a mold cavity is severed from an extruded quantity and introduced into the cavity. The mold is closed to build up pressure and force the material throughout the cavity. The excess material causes a pressure build up above the necessary molding pressure and causes a plunger in an overflow well to retract under the excess pressure so as to cause the overflow well to receive the excess material. Pressure can be maintained on material in the well during cooling to maintain the cavity filled when shrinkage occurs. Where adjacent thick and thin wall portions are formed in the article, the thick wall forming portion of the cavity may contain another well which receives excess material at a pressure slightly lower than the overflow well and this excess material may then be forced back into the cavity under pressure to insure filling thereof.

    Abstract translation: 一种用于从热塑性材料模制具有可变厚度壁的制品的方法。 稍微超过填充模具腔所需量的塑料量被从挤出量中分离并引入空腔。 关闭模具以建立压力并将材料强制施加到整个空腔中。 多余的材料导致压力高于所需的模制压力，并使溢流井中的柱塞在过压下缩回，以使溢流井容纳多余的材料。 在冷却期间可以在井中的材料上保持压力，以便在发生收缩时保持空腔填充。 在制品中形成相邻的厚壁部分和薄壁部分的情况下，空腔的厚壁形成部分可以容纳另一个井，该井在稍低于溢流井的压力下接收多余的材料，然后可将这种多余的材料压回空腔 在压力下确保其填充。

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