Molding apparatus

Details Molding apparatus Molding apparatus

B - Operations, Transporting

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B29D 11/00 (2006.01) B29C 43/34 (2006.01) B29C 43/36 (2006.01) B29C 43/58 (2006.01) B29C 45/12 (2006.01) B29C 45/28 (2006.01) B29C 45/56 (2006.01) B29C 45/76 (2006.01)

Patent

CA 1313737

Abstract of the Disclosure Apparatus for molding a plurality of articles having various masses and shapes wherein a parison mass is injected at constant back pressure through a time controlled valve from a supply of molten molding material at predetermined temperature and pressure. The articles are compression molded at predeter- mined pressures in accordance with their shapes or masses. The variable compression pressures are provided in one embodiment by similar actuators which are unequally excited; and in another embodiment an actuator is coupled to a mold cavity by a machine having a variable mechanical advantage. The actuators are pivotally mounted. A series of lenses including negative powers is particularly contemplated.

578461

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