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    Molding arrangement to achieve short mold cycle time
    2.
    发明授权
    Molding arrangement to achieve short mold cycle time 失效
    成型布置实现短模周期时间

    公开(公告)号：US5702735A

    公开(公告)日：1997-12-30

    申请号：US536930

    申请日：1995-09-29

    申请人： Wallace Anthony Martin ,  Wybren van der Meulen ,  Edgar V. Menezes ,  Kornelis Renkema ,  Robert B. Phillips ,  Victor Lust ,  Jongliang Wu ,  Gerbrand Eshuis

    发明人： Wallace Anthony Martin ,  Wybren van der Meulen ,  Edgar V. Menezes ,  Kornelis Renkema ,  Robert B. Phillips ,  Victor Lust ,  Jongliang Wu ,  Gerbrand Eshuis

    IPC分类号： B29C45/26 ,  B29C33/00 ,  B29C33/04 ,  B29C33/06 ,  B29C33/30 ,  B29C33/38 ,  B29C33/56 ,  B29C45/00 ,  B29C45/37 ,  B29C45/73 ,  B29D11/00 ,  B29K25/00 ,  B29L11/00 ,  G02C7/04

    CPC分类号： B29D11/0048 ,  B29C33/306 ,  B29C33/3842 ,  B29C33/56 ,  B29C45/37 ,  B29C45/73 ,  B29D11/00028 ,  B29D11/00125 ,  B29D11/0023 ,  B29C2045/7343 ,  B29C2045/7362 ,  B29L2011/0016 ,  B29L2031/757 ,  Y10S425/808

    摘要： An apparatus for molding polystyrene mold halves which are used, for subsequent molding of a soft contact lens. The apparatus is designed with superior heat conduction capacity so as to minimize the molding cycle time, while simultaneously producing uniformly precise and accurate optical quality surfaces. Molten polystyrene is provided via a hot runner system to a plurality of mold cavities. In a specific variation, the convex surface provides the optical quality surface to the concave surface of the mold half produced thereby. The structural element which defines the convex surface includes a hollow cylindrical bushing and a removable power insert mounted therein, which may be changed so that the prescription strength of the contact lens to be formed by the mold may be varied. In a first embodiment, the power insert includes only a convex surface at its operational end. In a second embodiment, the power insert includes an annular flat surface surrounding the convex surface, defining at the junction therebetween a discontinuity of curvature, which imparts a sharp edge to the mold half formed thereby. The power insert may be constructed of pure steel, or alternatively, it may be made of brass, copper chromium, or cobalt-nickel alloyed martensitic steel. The power insert may be coated with a surface layer of nickel phosphor or silicone oxide, or chrome nitride. These layers may be turned to their proper thicknesses and dimensions by diamond cutters, and they may be thermally hardened.

    摘要翻译： 用于模制聚苯乙烯半模的装置，用于随后模制软性隐形眼镜。 该设备设计具有优良的导热能力，以便最小化成型周期时间，同时产生均匀精确和准确的光学质量表面。 熔融聚苯乙烯通过热流道系统提供到多个模腔。 在具体的变型中，凸表面将光学质量表面提供给由此产生的半模的凹形表面。 限定凸表面的结构元件包括中空圆柱形衬套和安装在其中的可移除动力插入件，其可以改变，使得由模具形成的隐形眼镜的处方强度可以变化。 在第一实施例中，功率插入件在其操作端仅包括凸面。 在第二实施例中，动力插入件包括围绕凸表面的环形平坦表面，在其间的连接处限定曲率不连续性，其向由此形成的半模赋予尖锐边缘。 动力插入件可以由纯钢构成，或者也可以由黄铜，铜铬或钴镍合金马氏体钢制成。 功率插入件可以涂覆有镍磷光体或氧化硅表面层或氮化铬。 这些层可以通过金刚石切割器转到其合适的厚度和尺寸，并且它们可以被热硬化。