news about pipe extrusion line

news about pipe extrusion line

news about pipe extrusion line

The pipe extrusion line machine according to the invention is of the type comprising two independent screws adapted to cross each other while remaining substantially tangential, means for separately driving said screws in opposite directions from a single driving source, means for housing said screws in a cylindrical body, and a passage chamber at the crossing point of said screws and forming a communication between said screws, said machine further comprising a first cylindrical body arranged to receive at least one pair of parallel imbricated screws immobilized axially by one or more thrust bearings provided at each extremity of said cylindrical body, and a second cylindrical body housing an extrusion screw, communicating with said pair of imbricated screws, and delivering into an extrusion head. The invention is especially intended for the production of extruded articles of plastic material such as large diameter plastic pipes, the said pair of screws serving first to mix and jellify the plastic material which is then conveyed under pressure by the extrusion screw towards an extrusion head.

The extrusion machine according to the invention is essentially characterized by the fact that it comprises, on the horizontal, a first upper cylindrical body housing a pair of mixing screws, and perpendicularly or substantially perpendicular to this first body, a second lower cylindrical body which is associated therewith and houses at least one extrusion screw, the said screws being directly in communication at the crossing point, so that the material, first mixed and then jellified by the pair of screws, is transferred and then conveyed under pressure by the extrusion screw towards an extrusion head.

According to one particular feature of the invention, each of the screws of the said pair has its own driving means, preferably derived from a single motor having two axial output shafts of opposite orientation, the said screws being similar and arranged head-to-tail inside the body, and having their free end portions outside the body equipped so as to co-operate with reduction gears connected to the said driving means and arranged in opposition, while the cylindrical body is arranged so as to constitute internally an abutment for the other opposite end portions of the said screws.

An arrangement of this kind offers numerous advantages, both as regards manufacture which is considerably simplified, and as regards the rates and the quality of production which are improved in a substantial manner.

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