Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1997-03-28
1998-12-22
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264275, 2642791, 264513, 425112, 425149, B29C 4514
Patent
active
058514562
ABSTRACT:
A method and apparatus for manufacturing a multi-layer plastic product comprised of a hollow plastic core and an outer plastic layer formed on the core are provided. A mold has a plurality of segments and is provided with a plurality of supply ports arranged in a desired pattern. The mold is assembled with the hollow plastic core located in a mold cavity, and, then, a molten plastic material is supplied into the mold cavity through the plurality of supply ports. Then, the mold is set in its clamped condition to carry out shaping of the molten plastic material into the outer layer having a desired shape. Since the molten plastic material is supplied through a plurality of supply ports, the pressure inside the mold cavity during supply and shaping steps is maintained at a relatively low pressure level, preferably 200 kg/cm.sup.2, which is much lower than an ordinary pressure level used in injection molding.
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English Abstract of 4-189,528, Patent Abstracts of Japan M1328, vol. 16, No. 510.
Ezaki Yasuo
Mukawa Tatsuhiko
Nakagawa Tatsuya
Excell Corporation
Fuji Jukogyo Kabushiki Kaisha
MacDonald Thomas S.
Timm Catherine
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