Importance

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Abstract

A method and apparatus for manufacturing plates of thermoplastic synthetic material or the like by compression molding is disclosed, wherein a mold comprising a respective, horizontally, disposed upper and lower part is first filled with synthetic base material in granular form or the like, is subsequently heated while being pressure-charged and closed for the purpose of melting the synthetic base material. Finally, the mold is cooled in such a manner while being pressure-charged that the cooling essentially occurs from the horizontal mold surfaces, whereby, when manufacturing filter plates or the like exhibiting areas of unequal thickness, particularly a sealing rim and an essentially planar central area, a prefabricated core frame of solid synthetic material is provided which melts proceeding from its surfaces when the synthetic base material is melted is inserted into the mold into the area of the sealing rim or the like and whereby only the remainder of the synthetic base material is filled in the form of granular material or the like.

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First Claim