Werner & Pfleiderer Gmbh

Krupp Werner & Pfleiderer Gmbh

Bernhard Scheuring

Edgar Schlipf

Daniel Schwendemann

Erwin H&auml;ring

A method of preparing filled, modified and fiber reinforced thermoplastics is distinguished by the fact that polymer as matrix material together with blend polymer is fed to a twin screw extruder in a single manufacturing process, filler being supplied through a feeder device after the melting. Then fiber rovings are fed in and cut into long fiber sections in a fiber incorporation zone.

Method of preparing filled, modified and fiber reinforced thermoplastics and twin screw extruder for putting the method into practice

An apparatus for impregnating fibrous strands with plastic material as matrix material including: an impregnating core having an outer limiting surface; an impregnating shell defining a cavity therein having an inner limiting surface, the impregnating shell completely enveloping the impregnating core and being disposed with respect to the impregnating core such that the limiting surfaces together define an impregnating channel therebetween, the limiting surfaces concentrically enclosing the impregnating channel along a joint symmetry axis such that the impregnating channel has a ring-shaped cross section in a plane transverse to the joint symmetry axis, the ring-shaped cross section having an outside dimension which diminishes by stages in a flow direction for the impregnation, feeding channels for the fibrous strands and the matrix material being defined at an intake side of the impregnating channel and a discharge opening for impregnated fibrous strands being defined at an exit side of the impregnating channel; and a plurality of expanding elements disposed on the limiting surfaces along the impregnating channel in the flow direction for the impregnation. A method for producing long fiber reinforced plastic materials or unidirectionally fiber reinforced profiles involves the use of the above apparatus in conjunction with an extruder or a pultrusion plant, respectively.

Apparatus and method for impregnating fibrous strands with plastic

A twin-shaft screw-type extruding machine comprises a casing, shafts driven to rotate in the same direction of rotation and mixing elements facing each other and associated in pairs, which are disposed non-rotatably on the shafts. Each mixing element is a disk connected with a shaft. Mixing wings are provided at equal angular distances on the fronts, facing each other, of the disk and in the vicinity of the latter's respective circumference. A mixing wing of a mixing element and a mixing wing of the associated mixing element interengage and rotate past each other, while leaving a gap.

Twin-shaft screw-type extruding machine having mixing elements with wings

A process and apparatus for the production of plastic material containing an additive in which the plastic material is supplied into a mixing tank to undergo vigorous mixing therein and the mixed plastic material is discharged by an extrusion screw at the bottom of the tank into a conveying cylinder in which the extrusion screw extends. The mixed plastic material is conveyed by the screw in the conveying cylinder for discharge of the plastic material at a discharge outlet. The plastic material is heated in the conveying cylinder to achieve melting of the plastic material and the additive is supplied to the melted plastic material within the conveying cylinder so that the additive is thoroughly mixed with the melted plastic material before discharge thereof at the discharge outlet.

Process and apparatus for production of plastics containing additives

An extruder with at least one bore, in which an extruder shaft is arranged to be rotatingly driven, has a device for introducing a glass fibre strand. To this effect the shaft is provided with an adjustable throttling device, upstream of which starts out an impregnating channel which opens again into the bore downstream of the throttling device seen in conveying direction, i.e. into a mixing zone, in which the fibre strand is cut into fibre sections. An especially intense impregnating of the fibres of the fibre strand is thus achieved.

Growing community of inventors

Affalterbach, Germany

Bernhard Scheuring