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1. WO1980001890 - APPARATUS FOR WORKING RUBBER COMPOUNDS

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[ EN ]

THE CLAIMS
1. In a machine for processing rubber compounds comprising a cylinder; said cylinder having die means at one end thereof; a feed screw rotatably mounted in said cylinder and extending longitudinally therethrough for moving rubber compounds therethrough to progressively masticate and subject said compounds to a shearing action; said feed screw having a first means of a pair of helical flights defining a pair of channels for operatively exerting continuous pressure on said rubber compound for moving said rubber compound and subjecting said compound to a mastication; second means integral with said feed screw for continuously leading off the masticated portion of said compound that is subjected to a shearing action progressively from said first means as said masticated and sheared rubber compound is directed away from and not through the remaining rubber compound; said first means defines a pair of grooves having constant axial width with decreasing radial depths in the direction of said die means providing a constant amount of surface area exposed to said cylinder for material carried by said groove; and said second means defines a groove having an increasing axial width with increasing radial depth in the direction of said die means.
2. In a machine for processing rubber compounds as set forth in claim 1 wherein said groove of said second means progressively increases in cross-sectional dimension toward said die means.
3. In a machine for processing rubber compounds as set forth in claim 2 wherein said feed screw has a plurality of successive ones of said first means followed by said second means to form a plurality of successive stages.

4. In a machine for processing rubber compounds as set forth in claim 3 wherein a shear ring is interposed on said feed screw between a pair of successive said first means.
5. In a machine for processing rubber compounds as set forth in claim 4 wherein said shear ring has a plurality of radially extending fins that extend at a helical angle in an axial direction along said extruder screw.
6. In a machine for processing rubber compounds as set forth in claim 5 wherein said shear ring has a plurality of radially extending cylindrical pins arranged in circumferentially extending rows.
7. In a machine for processing rubber compounds comprising a cylinder; said cylinder having a die means at one end thereof; a feed screw rotatably mounted in said cylinder for moving rubber compounds therethrough to progressively masticate and shear said compounds and for extrusion therefrom; said feed screw having a feed section at one end and a metering section at the other end; said feed screw having a transition section between said feed section and said metering section; said transition section having a plurality of working sections in succession; each working section having a first means with helical flights means for operatively exerting continuous pressure on said moving the rubber compound; second means integral with said feed screw for continuously leading off the portion of said compound subjected to a shearing action by said flight means progressively from said first means wherein said sheared compound is being directed away from and not through the remaining masticated portion of said compound.
8. In a machine for processing rubber compounds as set forth in claim 7 wherein said flight means is a pair of spaced helical flights for moving and masticating said rubber compound, said pair of flights cooperative with said second means to define a pair of grooves wherein each groove has a constant axial width to maintain a constant amount of the rubber compound of the moving material to contact said cylinder; said second means has a groove of increasing axial width and increasing radial depth to provide a groove which progressively increases in cross-sectional dimension toward said die means; said grooves of said first means is defined by the leading face of a primary flight and the trailing face of a secondary flight of said first means; and said primary flight having a greater clearance between the uppermost edge portion of said primary flight and said barrel than the uppermost edge portion of said secondary flight.
9. In a machine for processing rubber compoundsas set forth in claim 8 wherein the respective bottom surfaces of said grooves of said first means merges with said uppermost edge portion of said primary flight to provide a clearance space that is equal to said clearance space provided between said uppermost edge portion of said primary flight and said barrel.