Abstract: The invention relates to a single-screw extruder comprising a cylinder (1), which comprises a transition zone (14), and a homogenizing zone (12) that is connected to the transition zone (14), and a screw (2) which is rotatably supported in the cylinder (1) and which has at least two consecutive displacement parts (6, 8) in the homogenizing zone (12), the second displacement part of which in the conveying direction is designed as a shearing part. The aim of the invention is to provide a single-screw extruder which enables an improved melting effect along with an increased throughput, a lowered melt temperature, and an improved pressurization capability.

Abstract: In a method for producing a coated composite component, an injection-molded part is produced in a first cycle by introducing a melt into the cavity of a first mold. A polyurethane layer is then applied to the cavity surface of an open polyurethane mold half. The mold half with the injection molded part produced in the first cycle is associated with the polyurethane mold half, and the so formed second mold is closed. The polyurethane layer is pressed or embossed onto the injection-molded part in the second mold, and the coated injection-molded part is removed once the second mold has been opened.

Abstract: The present invention relates to a mould, in which a completely closed cavity can be formed in one operating state, comprising an injector (10) which is at least partially accommodated in the mould (14) and the discharge opening of which opens into the closed cavity. According to the invention, the injector is designed with a material feed duct (30) and a material return duct (34), wherein the two ducts (30, 34) open into a connecting chamber (32) in the region of the tip of the injector (10) and are flow-connected to one another via said connecting chamber (32). In this case, an injector needle (36) can be switched into at least two operating positions, wherein, in one moved-forward operating position, the discharge opening is closed by means of the tip (38) of the injector needle (36) and, in the other, pulled-back operating position, the discharge opening is flow-connected to the connecting chamber, and the injector (10) is therefore open.

Abstract: An injection molding machine includes a clamping unit constructed for support of at least two molding tools to provide at least two different cavities. A first plasticizing unit is provided for charging one of the cavities in one of the molding tools, and a second plasticizing unit is provided for charging the other one of the cavities in the other one of the molding tools. The second plasticizing unit is hereby attached to a mounting in a substantially vertical orientation. The mounting may be mounted on one of the platens of the injection molding machine or on a frame which extends above the clamping unit.

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 flat molded plastic parts, for example panes, a mold is first filled completely with plastic material and additional plastic material is subsequently added, in such a way that the mold distends in a defined manner in opposition to the clamping force. The distension compensates for material shrinkage during a subsequent cooling operation, thus preventing sink marks and permitting the production of, for example, panes of high optical quality.

Abstract: In a method of operating an injection molding machine of a type having an injection plunger for pushing melt from an injection space anteriorly of an injection plunger into an injection mold, a plasticizing screw of an extruder is continuously operated to continuously feed melt through a melt channel into the injection space. A passage through the melt channel is closed to allow backup of melt backwards into the extruder, and the injection plunger is moved forward to inject a shot amount from the injection space into the injection mold.

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 sequentially programming an injection molding cycle of an injection molding machine comprising one or several injection molds, the injection molding cycle is started manually step by step. The parts of the injection molding machine and/or the parts of the injection mold(s) are manually displaced into the positions or states required for the injection molding cycle in the order required for the injection molding cycle. The movement sequence (the actions and the obtained states) of the machine parts and/or the mold parts is stored in a controller.

Abstract: A device for the production of multi-layer tubes (A), in particular foam core tubes, with an extruder arrangement (1), wherein the extruder arrangement (1) includes at least two extruders (2,3) for the production of melt, with at least one tube head (4) for forming the melt and with at least one calibration basket (5) to set the shaping and with at least one outlet (6) for transporting the produced multi-layer tube (A) is embodied and further developed with regard to a particularly favourably-priced production such that the calibration basket (5) is adjustable in diameter, so that the multi-layer tubes are changeable in their dimension in continuous operation.

Abstract: The invention relates to an apparatus, particularly a extruder or injection molding machine, for user-specifically monitoring and preferably regulating the processing of plastic materials. Said apparatus comprises a material feeding mechanism (1) that delivers the plastic as a raw material, a plasticizing device (2) which plasticizes/homogenizes the raw material, and a molding device (3) that shapes the plasticized/homogenized raw material into a product. A data link can be established between a control device (5) and an input device (130) via which at least one value of a process input variable, such as the cost of the apparatus, the raw material, power, and processed quantity, can be input. At least one process monitoring variable, e.g.

Abstract: Apparatus for stamping and cutting a plastic part includes a housing for accommodating a stamping press. The stamping press has a lower tool part, an upper tool part, and a drive for moving the lower and upper tool parts in relation to one another. A robot having a robot arm is constructed to move into a work zone of the stamping press, when the stamping press is open and thereby enable a laser device disposed on the robot arm to perform suitable cutting operations of the plastic part.

Abstract: A machining apparatus for making a plasticizing barrel includes a clamping device for securing the plasticizing barrel, with the clamping device constructed for rotation about a rotation axis and for off-center acceptance of the plasticizing barrel to thereby cause the plasticizing barrel to wobble about its symmetry axis, when the clamping device rotates. The clamping device interacts with a machining unit to provide the plasticizing barrel with an internal conical bore for receiving a screw. The machining unit has a turning tool which is movable linearly back-and-forth in a direction of an axis which extends in relation to the rotation axis at an incline of about half a cone angle of the conical bore, wherein the conical bore being produced has a center line which coincides with the rotation axis.

Abstract: The invention relates to an apparatus for introducing weakening cuts in a film or skin (24) containing a cutting knife (12) and a support (18) arranged in opposition to the cutting knife, wherein the film or skin can be placed between the support and the cutting knife and borne by the support, and the cutting knife is movable relative to the film or skin. In order to ensure a defined residual wall thickness, the invention proposes that the distance between the cutting knife and the support in the direction of the cutting axis (19) can be designed to be kept constant by a device.

Abstract: Disclosed is a method for programming the progress of an injection molding cycle of an injection molding machine. The injection molding cycle includes several sequences which are manually started as a whole or in part in a setup mode and in a teaching mode. In the setup mode, parts of the injection molding machine are first actuated and are tested as to the functionality thereof. The tested parts are then actuated once again in the teaching mode according to the desired sequence of movements, said sequence of movements being stored in a controller of the injection molding machine. Specific actions such as building up and reducing forces and generating holding pressure can also be taught. The individually taught sequences can then be freely combined into new processes in a controller having a suitable operator interface and can be repeated multiple times.

Abstract: In a method for producing a coated composite component, an injection-molded part is produced in a first cycle by introducing a melt into the cavity of a first mold. A polyurethane layer is then applied to the cavity surface of an open polyurethane mold half. The mold half with the injection molded part produced in the first cycle is associated with the polyurethane mold half, and the so formed second mold is closed. The polyurethane layer is pressed or embossed onto the injection-molded part in the second mold, and the coated injection-molded part is removed once the second mold has been opened.

Abstract: A mixing head includes a mixing device which is secured to a housing and has a mixing chamber for mixing at least two plastic components to form a material mixture. Received in a recess of the housing is a cleaning device which has a cleaning piston for back-and-forth movement in relation to the mixing chamber between a first position in which the cleaning piston is retracted from the mixing chamber and a second position in which the cleaning piston extends into the mixing chamber. The cleaning device has a barrier which interacts with a housing wall for pushing the material mixture radially outside. The barrier has a flank which has an incline which is steeper than an incline of the housing wall.

Abstract: A device for producing a plastic part that has a plurality of components includes a closing unit for receiving at least one mold in which a thermoplastic molded body can be shaped or positioned, and at least one polyurethane unit for introducing a polyurethane material into a larger cavity comprising the thermoplastic molded body. At least one additional polyurethane unit is provided for introducing an additional polyurethane material having different product properties into a same or a different, larger cavity. As an alternative, the at least one polyurethane unit can be adapted for an additional polyurethane material having different product properties for introduction into the same or a different, larger cavity.

Abstract: In a method for producing a composite, a carrier component is placed into an opened cavity of a mold. The mold is then closed to a predetermined position, thereby creating an cavity of a first expanded size. To improve venting, a vacuum is generated in the expanded cavity before filling the expanded cavity with a flooding material. A compression step is then executed either at the same time as flooding material is introduced or following the introduction of the flooding material.

Abstract: A component-feed nozzle for a reaction-mixing head of a reaction injection device includes a housing having a component inlet and a component outlet. Received in the housing is a closing and flow restriction member which is movable by a linear drive between at least two positions. In a first position, the closing and flow restriction member closes the component outlet, and in a second position clears the component outlet, thereby establishing a flow communication between the component inlet and the component outlet. The closing and flow restriction member has at least a first area and a second area, which generate forces in opposite directions, when the component pressure is applied, wherein the areas are sized in such a way that the opposing forces substantially offset one another.