SIMULTANEOUS RESIN DRYING AND MOLDING

摘要

A low pressure dryer for granular or powdery material includes a plurality of canisters rotatable about a common vertical axis serially among material heating, vacuum drying and material inventory discharge positions; pneumatic piston-cylinder means for rotating the canisters about said axis among said heating, vacuum drying and inventory discharge positions; means for heating contents of a canister at said heating position; means for sealing and drawing vacuum within a canister at said vacuum drying position and means for selectably permitting downward flow of dried granular or powdery material out of a canister at said discharge position where said canisters move collectively and unitarily one with another.

主权项

1. A method for molding plastic into finished products comprising the steps of:
a. mixing predetermined weights of plastic resin material components into a homogeneous blend; b. sequentially heating and vacuum drying batch portions of said blend with a next succeeding batch portion being heated while a current batch portion is vacuum dried; and c. molding at least one plastic product from said current portion after vacuum drying.