Abstract: A method for injection molding of plastic material by means of at least one injector whose pin valve can be displaced between a fully closed position and a maximum controlled fashion according to a position and speed of the pin valve. During displacement of the pin valve from the fully closed position to the maximum open position, and/or vice versa, the pin valve is stopped in intermediate positions and the displacement speed thereof is uniform and constant. An initial opening step at maximum speed and one or more steps of inversion of the motion of the pin valve can be provided for.

Abstract: A method is described for operating an actuator (10) adapted for moving by means of a pressurized fluid the shutter (12) of an injection nozzle for molten material into a mould, wherein the shutter (12) moves from a closing position, in which there is no passage of molten material through the nozzle, to an opening position, in which there is passage of molten material through the nozzle, and the shutter (12) comprises a chamber (18), and a piston (14) which is movably mounted in the chamber (18), displaced linearly thanks to the thrust of the fluid and connected to the shutter (12) to move it. The shutter (12) is moved by inserting or removing the predetermined amount of fluid into/from the chamber (18).

Abstract: A software-implemented method is described to compare via a graphical interface, freely crossing data relating to simulation results with finite-element analysis software and/or data concerning injection molding machine parameters obtained following molding tests or performed jobs, wherein the data are contained in an electronic database logically structured in one or more sets, and each set is divided into at least two logical portions (82, 84), one relating to the data relating to the simulation results and one relating to the press parameters (molding tests or works carried out), and each portion comprises a plurality of data collections organized internally in a plurality of fields. Homologous fields of a first and second collection are displayed orderly through a graphical interface by finding the fields in the database through indices generated by the selections.

Abstract: The injection moulding of articles formed by plastic materials having different characteristics, for example of different colours, is carried out in a single injection cycle in which the first and the second plastic materials are injected into a first and into a second zone of a mould cavity by first and second injectors controlled according to specific modes so as to define a shape and/or a position of a weld line.

Abstract: A method and apparatus for injection molding of plastic material into a cavity of a mold by means of at least one injector whose opening and closing occurs through an electronic control unit and wherein an undesired opening of the mold caused by any overpressure of the plastic material injected into the cavity of the mold is detected by means of transducers and corrected by means of the electronic control unit. The transducers are arranged outside the cavity of the mold.

Abstract: Apparatus for injection molding of plastic materials comprising a mold including at least one plate, a hot runner distributor of the fluid plastic material, at least one injector and an actuator for controlling the opening and the closing of the injector, supported by the distributor and whose cooling is carried out by means of thermal exchange contact with the plate. Provided for the cooling of the jack actuator provided for is at least one cover made of thermally conductive material at least partly surrounding the actuator in an axially slidable manner and it is maintained in thermal exchange contact with the plate by means of a magnetic or an electro-magnetic force.

Abstract: A device is described for adjusting the linear position of one or more shutters (20) in an injection moulding system. The device comprises a body, comprising a cavity in which there can axially slide a movable element, and an adjustment element for adjustment of the axial position of the body with respect to a plate. The adjustment element is rotatably mounted between the body and the plate and comprises a threaded portion on which a corresponding thread of the body and/or of the plate is engaged.

Abstract: The injection moulding of articles formed by plastic materials having different characteristics, for example of different colours, is carried out in a single injection cycle in which the first and the second plastic materials are injected into a first and into a second zone of a mould cavity by first and second injectors controlled according to specific modes so as to define a shape and/or a position of a weld line.

Abstract: An apparatus for injection molding of plastic materials includes a mold having at least one plate, a hot runner distributor of the fluid plastic material, at least one injector and an actuator for controlling the opening and the closing of the injector, supported by the distributor and whose cooling is carried out by thermal exchange contact with the plate. Provided for the cooling of the jack actuator is at least one body made of thermally conductive material at least partly surrounding the actuator in an axially slidable manner and it is maintained in thermal exchange contact with the plate by a magnetic force and/or a fluid thrust and/or an electrical drive force.

Abstract: A method for injection molding of plastic materials into a cavity of a mold by means of a molding apparatus including at least one injector having a pin valve displaceable between a fully closed position and a maximum opening position, and vice versa, in a controlled fashion in respect of its position and speed. In the opening displacement from the fully closed position to the maximum opening position, the pin valve is initially moved at a first speed and subsequently at a second speed, where the first speed is the highest opening displacement speed of the pin valve.

Abstract: A system and method for the injection moulding of plastic material through a plurality of injectors each having a pin valve displaceable in a controlled fashion between a closing position and an opening position by a respective actuator of an electronic control type, in which there is provided prompt activation of a preset function of changing a colour of the plastic material to be injected, actuated according to an optimized sequence which minimizes a number of moulding operations required to change the colour.

Abstract: A method and apparatus for the sequential injection moulding of plastic material into the mould cavity or by using a plurality of controlled open-close injectors, wherein the sequentially injected plastic material originates in mould flow fronts in different directions whose collision generates at least one weld line on the moulded article. The sequential injection is actuated with specific modes according to which the opening of the at least one of said injectors is anticipated or delayed with respect to other injectors and/or at least one of the injectors is closed partly and/or at least one of the injectors is gradually opened only partly. Such specific modes are managed to control and define the shape and/or the position of the weld line on the moulded article.

Abstract: A method for injection molding of plastic materials into a cavity of a mold by means of a molding apparatus including at least one injector having a pin valve displaceable between a fully closed position and a maximum opening position, and vice versa, in a controlled fashion in respect of its position and speed. In the opening displacement from the fully closed position to the maximum opening position, the pin valve is initially moved at a first speed and subsequently at a second speed, where the first speed is the highest opening displacement speed of the pin valve.

Abstract: A nozzle terminal of an injector comprises a tip and a ring nut having respective distal ends one of which is configured so as to be coupled with a gate of a moulding cavity, it cooperates with the shutter terminal of the valve pin of the injector, and it has an overall thickness in cross-section which is equal to or less than that of the cross-section of the shutter terminal of the valve pin.

Abstract: A nozzle terminal for injectors of plastic material injection molding apparatus, includes an inner tubular body or tip and a ring nut. The tip includes a radially inner element made of a first material and a radially outer element made of a second material arranged at contact with the radially inner element at an intermediate portion thereof terminating at a distance from the distal end thereof. The ring nut fully covers the radially outer element, insulating it from the environment.

Abstract: A system and method for the injection moulding of plastic material through a plurality of injectors each having a pin valve displaceable in a controlled fashion between a closing position and an opening position by a respective actuator of an electronic control type, in which there is provided prompt activation of a preset function of changing a color of the plastic material to be injected, actuated according to an optimized sequence which minimizes a number of moulding operations required to change the color.

Abstract: A molding method for the production of articles molded by injecting plastic material into a mold cavity by a plurality of injectors electrically sequentially actuated under an electronic control according to a cycle providing for a step for filling the mold cavity, followed by a step for packing the plastic material in the mold cavity. Each injector, regardless of both its position with respect to the mold cavity and its opening speed, is controlled in at least one of the following control modes: i) partially closing the injector from a maximum open condition to a less opened condition in the filling step, ii) setting the injector in a partially open condition and then opening the injector to a more opened condition, in the packing step.

Abstract: A nozzle terminal for injectors of plastic material injection moulding apparatus, includes a tubular tip defining a flow passage for the injected plastic material and including a radially inner element made of a first abrasion resistant material, an intermediate element made of a second high thermal conductivity material, and a radially outer element made of a third corrosion resistant material. The radially inner, intermediate and radially outer elements are joined to each other in intimate mutual contact, and the radially outer element fully covers the intermediate element thus insulating it from the environment.

Abstract: Injection molding of plastic materials by an apparatus comprising at least one injector including a valve pin displaceable in a controlled manner between a closed position and an open position by an electric rotary actuator. At least one step is provided of detecting the value of the torque developed by the electric rotary actuator when the valve pin is in the path from the closed position to the open position, and the torque value detected is used to pilot the molding process.

Abstract: A method is disclosed for producing a component formed by two layers (30, 40) of different, transparent or semi-transparent materials, wherein the component is molded in a mold (10) by over-molding two layers. One layer (40) is constituted by a polymer having structural characteristics and being resistant to impact, fracture or chipping, for example PC, and the other layer (30) is constituted by a polymer characterized by high scratch resistance, such as PMMA.