Abstract: In a method of producing an injection-molded part, a material is processed and/or plasticized by means of a multi-screw extruder having a plurality of processing zones. An additive having barrier characteristics is admixed by a feed unit in at least one of the processing zones. The material is processed and dried in the extruder, and can then be transferred to a transfer reservoir for further processing.

Abstract: In a method for producing injection-molded parts, PET material is processed and/or plasticized by means of a twin-screw extruder having a plurality of processing zones. At least two processing zones are implemented as degassing zones. The processed and/or plasticized material is transferred to a transfer reservoir and then further processed by a piston unit.

Abstract: In a method for producing injection-molded parts, PET material is processed and/or plasticized by means of a twin-screw extruder having a plurality of processing zones. At least two processing zones are implemented as degassing zones. The processed and/or plasticized material is transferred to a transfer reservoir and then further processed by a piston unit.

Abstract: Apparatus for producing injection-molded parts, particularly PET preforms, includes a twin-screw extruder or multi-screw extruder for preparing and/or plasticizing material, preferably in granular form, which is transferred to a transfer reservoir. A piston unit further processes the material. The extruder has a plurality of processing zones, whereby at least two process zones are configured as degassing zones.

Abstract: A control system for a plastics processing machine with at least one central processing unit with a real-time operating system is described. The central processing unit is connected to a plurality of actuators and/or sensors via a bus system, with at least one actuator and/or sensor directed to a rapidly fluctuating variable with a high-resolution. The first central processing unit can be released of overly burdensome control and communication tasks by using a first pre-processing unit which performs signal pre-processing for several sensors and/or actuators and by using a second pre-processing unit, which relieves the central processing unit directly of the bus communication.

Abstract: A platen of an injection molding machine includes a plate-shaped center area having corners, each corner formed with a recess. A plurality of sleeves is received in the recesses of the center area and defines bores for accommodation of column-like holding and/or guide elements. The sleeves have an outer surface in confronting relationship to the center area and are configured for only partial connection to the center area, thereby establishing an elastic connection between the center area and the sleeves.

Abstract: The invention relates to a clamping device for an injection molding machine for plastics, including a fixed platen (11) which is connected to a moving platen (12) by means of a toggle mechanism (13). A hollow-shaft motor (7) is provided to cooperate with a spindle (21) for operating the toggle mechanism, wherein the hollow-shaft motor (7) is connected to the toggle mechanism (13). According to the invention, the spindle (21) is arranged in a rotationally fixed manner, the end of the spindle (21), facing the moving platen (12), is in engagement with the rotor (6) of the hollow-shaft motor (7), and the stator (4) of the hollow-shaft motor is connected with the toggle mechanism (13). Preferably, a spindle nut is fixed in the rotor (6) for engagement with the spindle (21), preferably in the form of a recirculating ball screw.

Abstract: The invention relates to a screw mechanism comprised of a screw shaft (1), a screw nut (2) and rolling bodies. When the screw mechanism is subjected to a high static load, the forces are transmitted from the screw shaft (1) to the screw nut (2) by means of the rolling bodies. As the contact surfaces between the rolling bodies, the screw nut (2) and the screw shaft (1) are very small, only relatively weak forces can be transmitted. In order to adapt the screw mechanism to high static loads, using simple construction measures, the surface of the screw shaft (1) between the grooves (4) of the rolling bodies is provided with locking structures which can be form-fittingly connected with complementary locking structures of locking elements (7, 8) which are moveable essentially transversally to the axis of the screw shaft (1).

Abstract: The invention pertains to a closing device in the form of an injection-molding machine for plastics with a stationary mold clamping plate and a movable mold clamping plate, which can be operated by a linear motor. At least one linear motor (41, 42) is connected to a force transmission element (21, 22) which is connected to a lever mechanism (31-33).

Abstract: A control system for a plastics processing machine with at least one central processing unit with a real-time operating system is described. The central processing unit is connected to a plurality of actuators and/or sensors via a bus system, with at least one actuator and/or sensor directed to a rapidly fluctuating variable with a high-resolution. The first central processing unit can be released of overly burdensome control and communication tasks by using a first pre-processing unit which performs signal pre-processing for several sensors and/or actuators and by using a second pre-processing unit, which relieves the central processing unit directly of the bus communication.

Abstract: A platen of an injection molding machine includes a plate-shaped center area having corners, each corner formed with a recess. A plurality of sleeves is received in the recesses of the center area and defines bores for accommodation of column-like holding and/or guide elements. The sleeves have an outer surface in confronting relationship to the center area and are configured for only partial connection to the center area, thereby establishing an elastic connection between the center area and the sleeves.

Abstract: A plastics processing machine can be operated more flexibly by providing the controller of the plastic-processing machine with a wireless communication device that can exchange status and operating information with a remote input/output device via a communication network. The remote input/output device can be, for example, a mobile telephone or a handheld computer with integrated wireless capabilities.

Abstract: A molding machine includes a mold space between two mold carriers. One of the two mold carriers is movable relative to the other by a drive. A separate power unit generates a predetermined closing force between the two mold carriers when the two mold carriers are moved together. The separate power unit comprises, for its actuation, a pressure cushion filled with a composition that is highly viscous by comparison with hydraulic oil.

Abstract: The invention relates to a clamping device for an injection molding machine for plastics, including a fixed platen (11) which is connected to a moving platen (12) by means of a toggle mechanism (13). A hollow-shaft motor (7) is provided to cooperate with a spindle (21) for operating the toggle mechanism, wherein the hollow-shaft motor (7) is connected to the toggle mechanism (13). According to the invention, the spindle (21) is arranged in a rotationally fixed manner, the end of the spindle (21), facing the moving platen (12), is in engagement with the rotor (6) of the hollow-shaft motor (7), and the stator (4) of the hollow-shaft motor is connected with the toggle mechanism (13). Preferably, a spindle nut is fixed in the rotor (6) for engagement with the spindle (21), preferably in the form of a recirculating ball screw.

Abstract: The invention relates to a screw mechanism comprised of a screw shaft (1), a screw nut (2) and rolling bodies. When the screw mechanism is subjected to a high static load, the forces are transmitted from the screw shaft (1) to the screw nut (2) by means of the rolling bodies. As the contact surfaces between the rolling bodies, the screw nut (2) and the screw shaft (1) are very small, only relatively weak forces can be transmitted. In order to adapt the screw mechanism to high static loads, using simple construction measures, the surface of the screw shaft (1) between the grooves (4) of the rolling bodies is provided with locking structures which can be form-fittingly connected with complementary locking structures of locking elements (7, 8) which are moveable essentially transversally to the axis of the screw shaft (1).

Abstract: The invention relates to a clamping device for an injection molding machine for plastics, including a fixed platen (11) and an end platen (19) which is connected to a moving platen (12) by means of toggle mechanism (13). A hollow-shaft motor (7) cooperates with a spindle (21) and is arranged between the end platen (19) and the moving platen for operating the toggle mechanism. According to the invention, one or more carrier arms (23, 24) are arranged laterally to and/or beneath the hollow-shaft motor (7) for movable support of the hollow-shaft motor.

Abstract: The invention relates to a clamping device for an injection molding machine for plastics, including a fixed platen (11) and an end platen (19) which is connected to a moving platen (12) by means of toggle mechanism (13), wherein a hollow-shaft motor (7) with a stator (4) and a rotor (6) interacts with a spindle (21) for operating the toggle mechanism (13). It is proposed that the hollow-shaft motor (7) can be received in a recess of the end platen (19). Moreover, it is proposed that the spindle nut (5, 23) can be received in the inner dimensions of the rotor (6) of the hollow-shaft motor (7).

Abstract: The invention relates to an injection unit for an injection-molding machine, in particular for plastics, with a screw which is connected to a first actuator for rotating movement and to a second actuator for axial movement. In this case, the first actuator (21) is an electric motor, the second actuator (31) is a pressure bellows which can be filled with gas by a filling device (51), it being possible for the volume of the pressure bellows (31) to be altered by adjusting elements (32).

Abstract: A molding machine includes a mold space between two mold carriers. One of the two mold carriers is movable relative to the other by a drive. A separate power unit generates a predetermined closing force between the two mold carriers when the two mold carriers are moved together. The separate power unit comprises, for its actuation, a pressure cushion filled with a composition that is highly viscous by comparison with hydraulic oil.

Abstract: A process for the manufacture of plastic moldings with decorative coatings by injection molding, on an injection molding machine with an injection screw, which introduces the plastic into a cavity located in a mold clamping device, and an apparatus for the performance of the process.