Screw extruder
AssigneeSumitomo Rubber Industries, Ltd.
InventorsTakuzo Iwata, Isao Ohiwa
Life of this patent
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Abstract
A screw extruder comprises an extruder body (4) with a bore (4H), and a screw (5) rotatably disposed in the bore (4H). The screw (5) comprises a screw shaft (7) and two screw flights (8 and 9) disposed in the form of a double helix. The screw flight (9) is substantially continuous, but the screw flight (8) is provided with large interruptions (11) within which a plurality of additional flight pieces (13) are disposed to change the number of passages repeatedly. Mixing/kneading pins (15) protruding into the bore (4H) can be provided. Preferably, the paths (17) for the mixing/kneading pins (15) are positioned within the interruptions (11) and on the upstream side and downstream side of the additional flight pieces (13).
Claims5
A screw extruder comprising an extruder body (4) with a bore (4H), and a screw (5) rotatably disposed in the bore (4H),
- the screw (5) comprising a screw shaft (7), and two screw flights (8 and 9) disposed in the form of a double helix, wherein
- one of said two screw flights (8) is provided with large interruptions (11), whereby the screw flight (8) is divided by the interruptions (11) and screw flight pieces (12) are formed between the interruptions (11),
- within each of the interruptions (11), a plurality of additional flight pieces (13) which are substantially parallel with each other are disposed.
Dependencies are inferred from the claim text.