Paul Troester Maschinenfabrik

Reinhold Kaufmann

Hans-Joachim Gohlisch

Hans F Ramm

A screw extruder, for use with or without a calender, has a divided or split extruder head with upper and lower parts or halves hingedly mounted on a collar secured to a flange at the discharge end of the extruder cylinder. Each of the upper and lower extruder halves is movable between an open innoperative position and a closed operative position by a piston cylinder unit acting between a fixture on the respective extruder head part and a fixture on the extruder cylinder. When in closed position, the upper and lower extruder head parts or halves are pressed toward one another by a pair of vertical piston-cylinder units, each having a cylinder with lower end engaging the upper extruder head part and a projection on a piston rod engaging the lower extruder head part. The vertical piston-cylinder units are mounted on pivoted carriers mounted on the collar on the extruder cylinder. The two carriers are interconnected by a horizontal piston-cylinder and are also movable vertically. Operation of the apparatus is effected by an electro-hydraulic control circuit having a processor by which sequential operation of the piston-cylinder units is controlled.

Extruder head for an extruder

A packing sheet is formed on a calender having a rotatable large diameter heated cylinder and a rotatable smaller diameter unheated cylinder, with a gap between the cylinders, by feeding a preformed mixture of rubber material, fiber and solvent into the gap between the cylinders while the cylinders are rotating in opposite directions to form on the circumference of the large diameter cylinder a layer of progressively increasing thickness of the mixture during successive rotation of the cylinders. While the cylinders are thus rotating, heat from an external heat source is applied to the outer surface of the layer of material on the large diameter heated cylinder so that the material is heated both by heat from the large diameter heated cylinder and heat from the external heat source and is thereby vulcanized to form a cylindrical packing sheet. The cylinders are then stopped, the packing sheet is cut lengthwise of the cylinder and is stripped from the cylinder.

Growing community of inventors

Eschwege, Germany

Reinhold Kaufmann