Krauss-Maffei Aktiengesellschaft

Krauss-Maffei Kunststofftechnik Gmbh

Erwin Burkle

Martin Eichlseder

Markus Spotzl

Konrad Zweig

Markus Bauer

Helmut Horl

Peter Karlinger

A plastics injection molding machine includes a heatable plasticizing cylinder having an inlet side for incoming plastic material and a machine drive, and an injection mold receiving the plastic material from the plasticizing cylinder for making an injection molded article. Acting between the machine drive and the inlet side of the plasticizing cylinder is a heat transport system for preheating the incoming plastic material with waste heat generated by the machine drive to thereby realize a recovery of energy.

Plastics injection molding machine

A laminate is made by first forming a substantially closed mold cavity between a pair of mold halves, then injecting a plastified synthetic resin into the cavity under pressure to substantially fill the cavity and at least partially curing the resin in the cavity to form a base body. The mold halves are then separated to leave the partially cured body in one of the mold halves with a face of the body exposed and a deformable sheet is laid over the face of the body in the one mold half. A die having a face conforming at least generally to the shape of the body face is then laid down against the sheet onto the body to press the sheet into intimate contact with the body face and bond the sheet and body together.

System for making a molded laminate

A resin article is made between an outer concave mold part and an inner convex mold part that can fit together so that respective surfaces form a substantially closed mold cavity. This is done by first lining the surface of the outer mold part with a liner sheet and then fitting the lined outer mold part to the inner mold part to form the substantially closed mold cavity. A portion of the surface of the inner mold part is positioned to form a pocket open inward into the cavity and this pocket is filled with a mass of fluent synthetic resin. The surface portion is then pressed inward while the parts are fitted together and without otherwise relatively moving the mold parts to force the resin mass from the pocket into the cavity until the inner-part surface portion lies substantially flush with the rest of the inner-part surface.

System for molding laminated articles of a thermoplastic resin

A synthetic-resin article is molded by plastifying a virgin granulate into a fluent stream and plastifying a recycle granulate into another fluent stream. The recycle stream is then filtered while still plastified to removing particulate impurities from it. Then the filtered recycle stream while still plastified is combined with the virgin stream to form a combined stream and the combined stream is fed into a mold. The stream is mechanically filtered.

System for molding a synthetic-resin using plastic scrap

A check valve at the end of a plastifying worm for an extrusion or injection molding machine comprises a valve ring whose inner diameter is greater than that of a tip at the end of the head of the worm and which surrounds the neck connecting this tip with the valve seat of the worm. Spacers, preferably balls, are disposed between the ring and the tip and the surfaces of the ring and the tip flanking the balls are oriented to allow radial removal of the balls when the valve projects from the cylinder.

Check valve arrangement for the discharge end of an extruder, plastifier

A backflow preventer on the end of a plastifying screw for an injection molding apparatus has a housing provided with radial bores which are axially and angularly offset. A pin accessible from the exterior of the housing passes through a radial hole but traversing in a valve member with clearance to permit the stroke of the valve member to be adjusted by selective insertion of the pin in the bores.

Adjustable injection molding backflow preventer

A backflow preventer at the end of an injection molding worm has a pressure ring which abuts directly upon the worm and serves a shank of the valvehead which also bottoms in a bore upon the worm so that force transmission to the worm is over its entire cross section. The shank is surrounded by a blocking ring which can shift in its axial stroke between a position in which it abuts the head and a position in which it abuts the pressure ring, the axial stroke being adjustable by shims forming the floor against which the shank abuts within the bore of the worm.

Growing community of inventors

Benediktbeuern, Germany

Erwin Burkle