Sumitomo Rubber Industries Limited

Isao Ohiwa

Masahiko Ohki

Takuzo Iwata

A screw extruder comprises an extruder body () with a bore (H), and a screw () rotatably disposed in the bore (H). The screw () comprises a screw shaft () and two screw flights (and) disposed in the form of a double helix. The screw flight () is substantially continuous, but the screw flight () is provided with large interruptions () within which a plurality of additional flight pieces () are disposed to change the number of passages repeatedly. Mixing/kneading pins () protruding into the bore (H) can be provided. Preferably, the paths () for the mixing/kneading pins () are positioned within the interruptions () and on the upstream side and downstream side of the additional flight pieces ().

Screw extruder

An apparatus for manufacturing a strip of rubber compounds comprises four extruders () and a single extruder head (). The extruder head () comprises an extruder die assembly () and a main body (). The main body () is composed of a pair of laterally-spaced lateral blocks (), a central block () disposed between the lateral blocks, and a pair of laterally-spaced sub blocks () disposed beneath the lateral blocks (). The central block () has a pair of V-form side faces () extending in a V-shaped formation down to lateral ends of the bottom face (S). The lateral blocks () are each provided with an upper mount face (U) and a lower mount face (L) on which two of the four extruders are respectively attached. An upper preforming channel (Ua,Ub) extending from an extruder to the die assembly has a parting plane along the V-form side face (). A lower preforming channel (Lc,Ld) extending from an extruder to the die assembly also has a parting plane.

Growing community of inventors

Kobe, Japan

Isao Ohiwa