초록 ▼

A device is described which eliminates the pre-drying of particulate plastic prior to processing by an extrusion or injection molding machine. A tubular guide member directs particulate plastic under gravity into the feed inlet of the machine. During delivery, the temperature of the particulate plas

A device is described which eliminates the pre-drying of particulate plastic prior to processing by an extrusion or injection molding machine. A tubular guide member directs particulate plastic under gravity into the feed inlet of the machine. During delivery, the temperature of the particulate plastic is raised with heated air flows to between about 150°-200°F. Suction is applied to the feed inlet of the machine to remove volatiles (primarily water) released when the temperature of the particulate plastic is increased by contact with the heated barrel and screwdriver of a machine. Temperature and suction controls permit selection of operating temperature and suction levels that ensure removal of volatiles prior to any extensive plasticization and transfer along the barrel which would otherwise preclude proper removal of volatiles.

대표청구항 ▼

An apparatus for removing moisture and other volatiles from a particulate plastic material which is plasticized in a plastics injection molding or extrusion-type machine having a plastics material inlet, a heated barrel and screw, comprising: (1) guide means extending upwardly from said material inl

An apparatus for removing moisture and other volatiles from a particulate plastic material which is plasticized in a plastics injection molding or extrusion-type machine having a plastics material inlet, a heated barrel and screw, comprising: (1) guide means extending upwardly from said material inlet for guiding and feeding the particulate plastics material downwardly into said material inlet and along said heated barrel, said guide means having apertures in the sidewalls thereof and heating means for heating air passing therethrough; (2) perforated conduit means disposed substantially axially in said guide means; (3) suction means for applying a suction to said perforated conduit means such that a flow of air is heated by said heating means, drawn through said apertures in said guide means, through the downwardly flowing particulate plastics material, through said perforated conduit means and upwardly out of said perforated conduit and out of said guide means; (4) means for heating and working the particulate plastics materials passing along said heated barrel and screw wherein contact with the heated barrel and screw releases volatiles from the plastics material, and whereby said released volatiles are withdrawn from said barrel by action of said suction means through said material inlet and said perforated conduit and passed out of said perforated conduit and said guide means in the said flow of heated air; whereby, a flow of said plastics material which is substantially free of moisture and other volatiles is provided to said plastics molding machine for plasticization.