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    Injection moulding apparatus
    3.
    发明授权
    Injection moulding apparatus 失效
    注塑设备

    公开(公告)号：US4740150A

    公开(公告)日：1988-04-26

    申请号：US48862

    申请日：1987-05-12

    申请人： Matthew E. Sayer

    发明人： Matthew E. Sayer

    IPC分类号： B29C45/00 ,  B29C45/17 ,  B29C45/26 ,  B29C45/34 ,  B29L22/00

    CPC分类号： B29C45/1704 ,  B29C45/1734 ,  B29C2045/1729

    摘要： Apparatus for producing an injection moulding of plastics material comprises means for introducing a supply of plastics material, passage means for communicating the supply means to a mould space, and means for introducing a pressurized gas into the plastics material filling the mould space whereby the gas creates a gas containing cavity in the plastics material and for thereafter relieving the gas pressure within the gas containing cavity before the mould is opened. The gas supply/pressure relieving means comprise valve means including a valve port opening directly into the mould space, for opening the gas filled cavity to the atmosphere, a valve member for closing the port, and means to supply pressurized gas to the mould while the valve member is in the port closing position to create the cavity and to maintain the valve port open to the cavity whereby, after a moulding operation has been finished, the supply of pressurized gas can be terminated and pressurized gas in the cavity in the moulding can be vented to atmosphere by opening the valve member.

    Method and apparatus for injection moulding
    4.
    发明授权
    Method and apparatus for injection moulding 失效
    注射成型的方法和装置

    公开(公告)号：US4923667A

    公开(公告)日：1990-05-08

    申请号：US248539

    申请日：1988-09-23

    申请人： Matthew E. Sayer

    发明人： Matthew E. Sayer

    IPC分类号： B29C45/00 ,  B29C45/17 ,  B29C45/26 ,  B29C45/34 ,  B29L22/00

    CPC分类号： B29C45/1704 ,  B29C45/34 ,  B29C2045/1729 ,  Y10S425/058 ,  Y10S425/812

    摘要： An injection molded plastic article is produced by introducing a stream of molten plastic material from an injection molding machine cylinder into an article forming mold space. Pressurized gas is supplied into the interior of the molten plastic material to form a gas containing cavity therein. The plastic material is then allowed to solidify and cool sufficiently so that the article can itself sustain the form dictated by the mold surface. The cavity is vented to reduce the pressure within the cavity to ambient pressure prior to opening of the mold. The step of venting the cavity is achieved by providing at least one position which is separate from the plastic inlet and the gas inlet a vent passage in the mold open at its inner end to a part of the interior of the mold at which the gas containing cavity is formed, and a retractable closure for opening and closing the vent passage at its inner end, maintaining the closure in its closed position during the forming of the article whereby the cavity wall is formed over the inner end of the vent passage and the closure therefor, and subsequently retracting the closure to allow the creation of a vent opening in the cavity wall in the area of the inner end of the vent passage through which vent opening gas from the cavity passes into the vent passage. Apparatus for carrying out the above process is also described.