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.

The present invention provides a molding machine that can easily detect viscosity of resin in a cylinder without advance preparations. An injection molding machine (10) includes an ultrasonic viscosity sensor (20), and the ultrasonic viscosity sensor (20) includes an ultrasonic vibration portion in contact with resin filled in a cylinder (12).

A control device of an injection molding machine, which includes an injection member provided in a cylinder heating a molding material and an injection drive source causing the injection member to advance to fill an inside of a mold unit with the molding material, includes an injection control unit that performs a retreat speed limitation to limit an actual speed value of the injection member to a first set value or less during retreat of the injection member in a holding pressure process for controlling a pressure acting on the molding material from the injection member. The injection control unit releases the retreat speed limitation in a case where a first set condition is satisfied while the retreat speed limitation is performed.

A molding management device for managing an injection molding machine includes: a first production unit information generation unit configured to generate first production unit information which is information on a molding job for molding the molded article; a second production unit information generation unit configured to generate second production unit information which is information on a lot of the molded article and is associated with a specific cavity; a first acquisition unit configured to acquire shot identification information which is information on a shot for injecting the molding material into the cavity; a second acquisition unit configured to acquire molded article information which is information on the molded article; and a storage unit. The storage unit stores the first production unit information, the second production unit information, the shot identification information, and the molded article information in association with one another, stores the second production unit information as information on a lower data hierarchy than the first production unit information, and stores the shot identification information as information on a lower data hierarchy than the second production unit information.

An injection molding apparatus and an method for the manufacture of moldable articles having an injection manifold, a plurality of hot runner nozzles, a first nozzle heater, a plurality of mold cavities positioned to receive molten material from the plurality of the hot runner nozzles, each mold cavity having at least one mold gate orifice and a mold cavity heater surrounding each mold cavity at least partially and a thermocouple associated with the mold cavity to measure directly or indirectly a temperature generated by the mold cavity heater.

A method and apparatus for producing hollow articles made of injection moulded plastic material by a mould having a die within which there is inserted a core, and at least one injector including a pin valve displaceable between a closing position and an opening position for injecting the pressurized plastic material into a space comprised between the die and the core. During the injection, any flexural deflection of the core is detected and the pin valve of the or of each injector is displaced in a controlled fashion to adjust a pressure and a flow rate of the injected plastic material, so as to reduce or eliminate such deflection of the core.

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.

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.

A strain gauge nozzle adapter that may be placed between a barrel end cap and a nozzle body of an injection molding system, the strain gauge nozzle adapter having a strain gauge pin that measures strain within the strain gauge nozzle adapter for use in approximating conditions within an injection molding system, such as pressure or the location of a melt flow front. The strain gauge nozzle adapter may include a plurality of strain gauge pins. An alternative material insert in the strain gauge nozzle adapter may surround a strain gauge pin to amplify meaningful measurements obtained by the strain gauge pin so that noise measurements do not compromise the accuracy of approximation of conditions within a mold.

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.