Molding apparatus and method

Details Molding apparatus and method Molding apparatus and method

1989-02-01

1990-06-12

Chiesa, Richard L.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

264 22, 2642978, 2643287, 425159, 425344, 425352, 425588, 425808, B29D 1100

Patent

active

049331191

ABSTRACT:
Apparatus and method 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 predetermined 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.

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