Extruder

Classification of Extruders

Classification of ExtrudersRam Extruder

Classification of Extruders

Classification of ExtrudersCounter rotating screwsNon intermeshingPartial intermeshingIntermeshing

Classification of ExtrudersA) Single screw extruder, cross section of the feedzone. A1) Smooth (conventional), A2) GroovedSleeve

B) Pin barrel extruder

C) Co-Kneader, a Screw, b Kneading teeth, c Barrel

D) Single screw extruder with cavities in the barrel

E) Co-rotating twin screw extruder, intermeshing

F) Counter-rotating twin-screw extruder, intermeshing

G) Counter-rotating twin screw extruder, nonintermeshing

H) Planetary roller extruder, a Melting and feedsection, b planetary screws and sun screw

Cross section of a 4-screw degassing system

K) Gear pump

L) Plunger extruder, L1) Ram extrusion, L2)Hydrostatic extrusion: a Plunger, b Barrel, c Billet,d Extruded strand, e Hydraulic fluid

M) Single roll extruder, a Inlet, b Housing, c Roll, dAdjustable knife, e Die

N) Disk pack extruder. N1) Cross section(perpendicular), N2) Cross section (along theshaft), a Rotating disks, b Shaft, c Barrel, dChannel blockClassification of Extruders-Types of construction

Schematic of a single screw extruderMachine parts for single screw extrusion

Hopper designMachine parts for single screw extrusionGood hopperPoor hopper

Geometry of feed opening in the feed throatMachine parts for single screw extrusion

Vented extruder barrel with a two stage screwMachine parts for single screw extrusion

Schematic of a single screw extruder-barrel heating or coolingMachine parts for single screw extrusion

Machine parts for single screw extrusionScrew zones main dimensions

Machine parts for single screw extrusionScrew zones main dimensionssingle-flighted screw, B) double-flighted screwb Channel width, D Barrel diameter Outer screw diameter e,e* Flight width h Channel depth t Lead Flight clearancej Helix angle

Machine parts for single screw extrusionDispersive and distributive mixing elementsDispersive mixing elementsDistributive mixing elements

Specialties of twin screw extrusion

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