Abstract: A device for the injection moulding of moulded bodies made from plastic is disclosed, comprising an injection moulding unit (1) and a tool (2) dedicated thereto. At least two cavities (11, 12), corresponding to the dimensions of the moulded body for production are provided on the tool (2) and the tool comprises at least three pieces (4, 5, 6), which move relative to each other and which lie adjacent to each other on separating planes (9, 10). Each separating plane (9, 10) runs through at least one cavity (11, 12). At least one channel (13) for the introduction of molten plastic is provided in the tool (2), which terminates at one end in the cavities (11, 12) and at the other end thereof at an inlet (14) on the surface of the tool (2), which is connected to the injection moulding unit (1) in the working position.

Abstract: A device for the injection moulding of moulded bodies made from plastic is disclosed, comprising an injection moulding unit (1) and a tool (2) dedicated thereto. At least two cavities (11, 12), corresponding to the dimensions of the moulded body for production are provided on the tool (2) and said tool comprises at least three pieces (4, 5, 6), which move relative to each other and which lie adjacent to each other on separating planes (9, 10). Each separating plane (9, 10) runs through at least one cavity (11, 12). At least one channel (13) for the introduction of molten plastic is provided in the tool (2), which terminates at one end in the cavities (11, 12) and at the other end thereof at an inlet (14) on the surface of the tool (2), which is connected to the injection moulding unit (1) in the working position.

Abstract: The invention relates to a method for injection molding a plastic molded part in an injection mold, comprising a) injecting a specified amount of plastic melt into the injection mold; b) introducing a compressed fluid between a part of the wall of the injection mold and the injected plastic melt; c) allowing the plastic melt to cool until the plastic molded part is self-supporting; and d) removing the plastic molded part from the mold. The invention specifies that, during or after step a) and during or before step b), the cavity of the injection mold is sealed against the environment, preferably by activating at least one seal.

Abstract: A two-platen injection molding machine without tie bars has a platen fixed relative to the machine frame and a platen that moves relative to it, a traverse mechanism that operates the movable platen, a device for generating clamping force and a device to compensate for the deformation forces occurring during generation of the clamping force. The traverse mechanism and the device for generating clamping force are decoupled. Preferably, the device for generating clamping force has at least one connecting rod that passes through both the fixed and movable platens beneath the mold space. The connecting rod is detachably fastened to one of the platens and can be locked to the other platen by means of a clamping device that produces the clamping force. The device to compensate for the deformation forces includes at least one rigid spacer detachably fastened at one end to one platen, while the other end of the spacer is forced against the other platen.

Abstract: An electric drive with hydraulic assist is disclosed for use in an injection molding machine, especially for screw advance during the injection process and/or in the dwell pressure phase. An electric motor is primarily used to produce the axial advance of the injection screw via an appropriate gear train. A piston that is moveable in a cylinder through pressure provided by a hydraulic fluid reservoir, can be used to supplement the axial movement produced by the electric motor. It is proposed according to the invention that pressurization occurs via the hydraulic fluid reservoir upon reaching a defined control quantity which corresponds to a defined load condition on the electric motor, such that the pressure rise in the cylinder is proportional to the load on the electric motor.

Abstract: A standard injection molding machine is combined with an auxiliary plasticizing unit having a hot runner manifold that can be alternately connected with or disconnected from the main injection unit of the molding machine to perform sandwich molding. The injection unit retracts from the mold to connect with a hot runner and receive skin material from a non-reciprocating screw extruder directly into the barrel of the injection unit. The injection unit then disconnects from the hot runner and moves back into position for injection into the mold. Simultaneously with this movement, the injection unit plasticizes sufficient core material to complete the stacked arrangement of skin and core material necessary for sandwich molding. In an alternate embodiment, the sandwich molding apparatus includes an accumulator with a suitable valve and connections to the other components to supply a final shot of skin material into the mold, as well as provide the pack and hold functions of the injection cycle.

Abstract: A device for producing moldings of plastic material having a cavity therein filled with a fluid comprises a mold cavity, an injector for injecting flowable plastic into the mold cavity, an injector for injecting a pressurized fluid into an interior portion of the plastic, and a side cavity connected to the mold to receive flowable plastic melt expelled by the injected pressurized fluid. The side cavity may be randomly lockable and may comprise a closing stuffer which rests flush with respect to the mold cavity interior walls.

Abstract: The invention relates to a process for the injection molding of fluid-filled plastic bodies and a device to carry out this process, wherein a pressurized, flowable plastic melt is first injected by means of at least one nozzle into a mold cavity clamped by a two-part or multi-part mold until the mold cavity is completely filled. Next, after cooling of the plastic melt on the mold cavity walls has set in, a pressurized fluid is injected in such manner into the interior of the plastic melt located in the mold cavity that the still melted center of the resulting plastic body is expelled into at least one side cavity arranged outside the mold cavity and connected thereto.

Abstract: A device for producing moldings of plastic material having a cavity therein filled with a fluid comprises a mold cavity, an injector for injecting flowable plastic into the mold cavity, an injector for injecting a pressurized fluid into an interior portion of the plastic, and a side cavity connected to the mold to receive flowable plastic melt expelled by the injected pressurized fluid. The side cavity may be randomly lockable and may comprise a closing stuffer which rests flush with respect to the mold cavity interior walls.