Abstract: The method for introducing an additive into a flowing stream of media pulses discrete quantities of the additive into the stream at a pressure higher than the pressure of the stream and at set time periods to cause the pulses to penetrate into the stream. Use is made of a nozzle that can introduce the additive in flow and counterflow to the stream of media.

Abstract: The method introduces additives into flowing gas, fluid or fluidized media in a pulsed high pressure manner. The nozzle needle of at least one nozzle is variable and highly precisely moved for the introduction by means of a device and in such a way that additive is dosed exactly in relation to the volume flow of the medium. The pulsating additive stream is injected into the flowing medium by at least one well-aimed nozzle opening. The additives are dosed by means of a pressure that can be variably adjusted by pulse width and pulse frequency. The desired homogenous distribution is obtained by the penetrating injection jet.

Abstract: The method introduces additives into a flowing melt or fluidized metallic/ceramic powder media in a pulsed high pressure manner. The nozzle needle of at least one nozzle is variable and highly precisely moved for the introduction by means of a device and in such a way that additive is dosed exactly in relation to the volume flow of the medium. The pulsating additive stream is injected into the flowing medium by at least one well-aimed nozzle opening. The additives are dosed by means of a pressure that can be variably adjusted by pulse width and pulse frequency. The desired homogenous distribution is obtained by the penetrating injection jet.

Abstract: An injection unit for an injection molding machine includes a barrel and a plasticizing screw received in the barrel. An electromotive rotary drive causes the plasticizing screw to rotate and is supported for joint movement with the plasticizing screw in relation to the barrel in direction of an injection stroke. The plasticizing screw and the rotary drive are moved by an electromechanical injection stroke drive to execute the injection stroke. A linear guide is connected to a machine bed for guiding a longitudinal movement of the injection stroke drive and the plasticizing screw. Misalignment of the coaxial disposition of the plasticizing screw, the rotary drive and the injection stroke drive is eliminated by providing a housing shell which is torsionally stiff and moveably accommodates the rotary drive, wherein the plasticizing barrel and the injection stroke drive are connected by the housing shell in a tension-proof manner and supported via the housing shell on the linear guide for longitudinal movement.

Abstract: An electromotive adjustment drive includes an electric drive having a single motor with a rotor having a magnetic pole assembly, and a stator interacting with the rotor and having a magnetic pole assembly. The rotor is operatively connected to a member, such as a plasticizing screw of an injection unit, and is constructed for movement along a travel path, whereby one of the magnetic pole assemblies of the rotor and the stator is extended in relation to the other one of the magnetic pole assemblies of the rotor and the stator by a portion corresponding to the travel path. A spindle drive is positioned between the rotor and a motor housing and has a first transmitting element which is operatively connected to the rotor, and a second transmitting element which supports the first transmitting element. A plurality of switching elements is constructed for selective operation of the electric drive as a rotary drive or as injection drive.

Abstract: An actuating drive for a plasticizing unit of an injection molding machine is disclosed. The actuating drive includes a spindle drive with an electric motor and a control mechanism. An energy storage device is coupled with the spindle drive for force transmission therebetween. The energy storage device is loaded by the spindle drive in a return stroke phase and is unloaded in a forward feed phase, boosting the power of an electric motor. The actuator drive can be used, for example, for pulsating actuation of a mold ejector of the injection molding machine, significantly reducing the electrical energy consumption compared to conventional drives.

Abstract: An injection molding machine includes an actuating drive in form of an electromotive spindle drive and an energy storage device associated with the spindle drive. The energy storage device stores kinetic energy and can include two counteracting compression spring assemblies. The energy storage device is hereby loaded, as the spindle drive moves to a first end position, and unloaded, as the spindle drive moves in opposite direction to a second end position, wherein unloading of the energy storage device is accompanied by a power boost of the electric motor, and wherein the first force is equal to the second force at an equilibrium location distal from the end positions of the spindle drive.

Abstract: A linear drive for an injection molding machine includes a housing defining a sealed interior space containing a gas volume. The housing has two housing portions constructed for telescopic movement within one another. A spindle drive is accommodated in the housing and operated by the electric motor. The spindle drive includes a spindle shaft, which is axially securely fixed to one of the housing portions, and a spindle nut, which is arranged on the spindle shaft and axially securely fixed to the other one of the housing portions. Acting on the spindle drive is an energy accumulator which is constructed for discharge in a first operating cycle which is energy-intensive and for recharging in a second operating cycle which is opposite to the first operating cycle and requires little energy.

Abstract: Process for manufacturing molded articles made of plastics, cellulose, pulp or wood fibers with cavities, in particular composite parts for light weight construction, by means of tool parts, including the following process steps: a) matrix layer is provided at pre-selected locations with inserts containing gas-creating substances or blowing agents and b) these inserts are activated to create gas in tool parts and thus expand the matrix material. Also disclosed are gas-creating insertion elements for use in the process and made of gas-creating blowing substances enclosed in gas-proof sheaths or inserted into the matrix material in order to form locally limited areas. This process allows the production of particularly light and at the same time solid tool parts, in particular composite parts for light-weight construction.

Abstract: A method introduces additives into flowing or fluidised media. The spatially predetermined position of the additives in the flowing material, also called fluid bed, is obtained by controlling the pulsating injection, The introduction and exact dosing of additives, that is hardeners, dyes, gas producers and softener for instance, into a liquid plastic stream or metal stream (10) for instance, or the fluid bed of bulk material, such as powder, granules and pellets, is carried out by means of an injector. The invention is used in melting units, in hot channel systems, in tools, componens of tools and injection moulding machines, extruders, injection moulding, pelleting, burner and injection arrangements.

Abstract: An injection unit for an injection molding machine includes a barrel and a plasticizing screw received in the barrel. An electromotive rotary drive causes the plasticizing screw to rotate and is supported for joint movement with the plasticizing screw in relation to the barrel in direction of an injection stroke. The plasticizing screw and the rotary drive are moved by an electromechanical injection stroke drive to execute the injection stroke. A linear guide is connected to a machine bed for guiding a longitudinal movement of the injection stroke drive and the plasticizing screw. Misalignment of the coaxial disposition of the plasticizing screw, the rotary drive and the injection stroke drive is eliminated by providing a housing shell which is torsionally stiff and moveably accommodates the rotary drive, wherein the plasticizing barrel and the injection stroke drive are connected by the housing shell in a tension-proof manner and supported via the housing shell on the linear guide for longitudinal movement.

Abstract: An actuating drive for a plasticizing unit of an injection molding machine is disclosed. The actuating drive includes a spindle drive with an electric motor and a control mechanism. An energy storage device is coupled with the spindle drive for force transmission therebetween. The energy storage device is loaded by the spindle drive in a return stroke phase and is unloaded in a forward feed phase, boosting the power of an electric motor. The actuator drive can be used, for example, for pulsating actuation of a mold ejector of the injection molding machine, significantly reducing the electrical energy consumption compared to conventional drives.

Abstract: An injection molding machine includes an actuating drive in form of an electromotive spindle drive and an energy storage device associated with the spindle drive. The energy storage device stores kinetic energy and can include two counteracting compression spring assemblies. The energy storage device is hereby loaded, as the spindle drive moves to a first end position, and unloaded, as the spindle drive moves in opposite direction to a second end position, wherein unloading of the energy storage device is accompanied by a power boost of the electric motor, and wherein the first force is equal to the second force at an equilibrium location distal from the end positions of the spindle drive.

Abstract: A pressure measuring device for an injection molding machine, includes a stroke drive mechanism operatively connected to a plasticizing unit of an injection molding machine, a force transmission member elastically deforming in response to an axial force and having one side facing the drive mechanism and another side facing the plasticizing unit. Each side of the force transmission member has at least two elevated supports, wherein the supports on one side are positioned in offset relationship to the supports of the other side. A sensor element is provided to measure a bending deformation of the force transmission member in a peripheral area thereof between two supports of the force transmission member for determining the injection pressure.

Abstract: The invention relates to a method for introducing additives into flowing or fluidized media. The spatially predetermined position of the additives in the flowing material, also called fluid bed, is obtained by controlling the pulsating injection, The introduction and exact dosing of additives, that is hardeners, dyes, gas producers and softener for instance, into a liquid plastic stream or metal stream (10) for instance or the fluid bed of bulk material, such as powder, granules and pellets, is carried out by means of an injector. The invention is used in melting units, in hot channel systems, in tools, componens of tools and injection moulding machines, extruder-, injection moulding-, pelleting-, burner- and injection arrangements.

Abstract: Process for manufacturing molded articles made of plastics, cellulose, pulp or wood fibers with cavities (9), in particular composite parts for light-weight construction, by means of tool parts (1, 2), including the following process steps:

Abstract: A process forms lightweight molded articles by positioning inserts having gas creating substances at set positions on a matrix layer positioned between mold halves. The matrix layer with inserts is pressed into the mold cavity and sandwiched between molding material. The gas forming substances are activated to produce gas and the mold halves partially opened to allow the gas to form gas cavities at the position of the inserts. The matrix may be a film or net with gas creating substances in attached packets. Alternatively, the matrix may be developed with inserts of gas producing substances encapsulated within molding material by co-extrusion or co-injection nozzles.