초록 ▼

A method and apparatus for feeding an additive, such as glass fibers, fillers, etc., to a plastic resin in an extruder is disclosed. The additive is fed by means of a screw type feeder into the barrel of a plastics extruder or reciprocating screw plastifier at a location where the resin is molten an

A method and apparatus for feeding an additive, such as glass fibers, fillers, etc., to a plastic resin in an extruder is disclosed. The additive is fed by means of a screw type feeder into the barrel of a plastics extruder or reciprocating screw plastifier at a location where the resin is molten and the resin pressure is low.

대표청구항 ▼

Apparatus for the production of an extrudate of a resin and an additive comprising in combination: a plastics extruder adapted to heat plastify resin having a barrel with a bore and a rotating screw within the bore having a melting stage and a low pressure section downstream of the melting stage; an

Apparatus for the production of an extrudate of a resin and an additive comprising in combination: a plastics extruder adapted to heat plastify resin having a barrel with a bore and a rotating screw within the bore having a melting stage and a low pressure section downstream of the melting stage; an inlet for said extruder disposed on said barrel to feed resin to said melting sTage; an additive feeder adapted to feed additive to the resin in the extruder having a barrel with a bore and a rotating screw within the bore; the barrel of the additive feeder connected at one end to the extruder barrel with the bore of the additive feeder barrel intersecting the extruder barrel bore at a location corresponding to the low pressure section of the extruder screw, said low pressure being above atmospheric pressure; said intersection of said feeder barrel with said extruder barrel being axially displaced along said barrel from said inlet for said extruder; said rotating screw of the plastics extruder having an axial extension extending from said bore of said plastics extruder barrel upstream from said melting stage, and adapted to be coupled to rotary drive means and said rotating screw of the plastic extruder coacting with the barrel of said extruder to preclude movement of matter in said barrel counter to the direction from the inlet of said barrel to the outlet of said barrel; said rotating screw of said feeder having an axial extension extending from said bore of said feeder barrel and adapted to be coupled to rotary drive means to discharge a quantity of additive directly into the bore of said plastics extruder independently of the flow rate in said plastics extruder; and so that said screw of said feeder and said screw of said plastics extruder can be driven simultaneously to continuously and simultaneously mix a quantity of additive with the plastic as the plastic passes through the bore of the plastics extruder.