Engel Maschinenbau Gesellschaft M.b.h.

Hydac Technology Corporation

Engel Maschinebau Gesellschaft M.b.h.

Engel Maschinenbau Gesellschaft Gmbh

Engel Maschinebau Gesellschift M.b.h.

Engel Austria Gmbh

Alfred Lampl

Georg Steinbichler

Otto Urbanek

Heinz Leonhartsberger

Gerhard Wimbauer

Helmut Naderhirn

Erhard Smek

Peter Neumann

Double closing unit for an injection moulding machine

Injection moulding machine

A method for supplying a selected quantity of gas to the mold of an injection molding machine utilizes two high pressure gas bottles which are connected through a pressure reducing valve to a piston reservoir for receiving a quality of the gas. The piston reservoir is hydraulically powered to supply the gas to a further piston reservoir having a smaller volume which is connected through a valve to the mold. The second piston reservoir is also hydraulically powered for supplying a selected quality of gas under a variable pressure to the mold. Gas from the mold is recycled to both reservoirs in steps.

Injection molding process with pressure increasing mechanism

A process for tempering tools, for use on the form tools of extrusion forming machines. In the injection molding tools there are conduction circuits for a coolant which are connected to ducts for the inflow and backflow of the coolant. Valves (4) control the throughflow of the coolant. There are temperature sensors (5, 6) in the ducts for the inflow and backflow of the coolant. The temperature sensors (5, 6) are connected to a computer (7) which controls the opening and closing times of the valves (4) as a function of a nominal difference fed in between the inflow and backflow temperatures of the coolant. Advantageously, a temperature sensor (3) which is also connected to the computer (7) is provided on the form tool.

Process of tempering plastic injection molding tools

Described is a method of controlling the mold filling process of a plastics injection molding wherein, for the purposes of avoiding fluctuations in the mass of the moldings, due to material not being of a uniform quality, the change-over point between the filling phase and the back-pressure phase is shifted by a predetermined value in dependence on the injection work which is detected during the filling phase.

Method of controlling the mold filling process in a plastics injection

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Schwertberg, Austria

Alfred Lampl