Continuous extruder for thermosetting resins

Claim 1

A continuous extruder for thermosetting resins, comprising first and second oppositely rotatable screw members and an elongate housing within which said screw members are located, said screw members each comprising a first, feed portion for feeding raw materials forwardly along said housing, a second, rotor portion, having discontinuous flights, for kneading and mixing the raw materials fed thereto from said feed portion, and a third, discharge portion for discharging the kneaded and mixed raw materials under pressure, at least the feed portions of said screw members meshing with each other so as to provide uniform feeding of the raw materials, said housing including first, second and third orifices, located at said feed portions of said screw members, for receiving thermosetting resin materials, filler materials and reinforcing materials, respectively, said housing being open at the end thereof opposite to the feed portions of said screw members, and including jacket means, in surrounding relationship thereto, for controlling the temperature of the raw materials received by the extruder, said rotor portions of said screw members being constituted by a series of rotor sections which intermesh to provide forward feeding of the raw materials; each of said rotor sections having a cross-sectional design corresponding to that of batch-type Banbury-type rotor blades and oppositely projecting blades of each of said rotor sections being respectively twisted oppositely at a given angle between both ends, each of said blades being twisted by substantially 90° along the length thereof between the ends of the blade.