A control device for an injection molding machine including a cylinder into which a resin is supplied, a nozzle disposed at a distal end of the cylinder, and a screw that moves forward and rearward inside the cylinder, the injection molding machine performing metering of the resin while the resin is being melted inside the cylinder, by causing the screw to be moved rearward to a metering position, so as to keep the resin pressure at a metering pressure, includes a calculation unit configured to calculate a suck back distance or a suck back time period that achieves drawing in of a target volume of the resin inside the nozzle toward the cylinder, and a suck back control unit configured to cause the screw to be sucked back, based on the suck back distance or the suck back time period, after the screw has reached the metering position.

A control device for an injection molding machine including a cylinder into which a resin is supplied, and a screw that moves forward and rearward and rotates inside the cylinder, includes a suck back control unit that sucks back the screw based on a predetermined suck back speed and a suck back distance or a suck back time period, a pressure acquisition unit that acquires a pressure of the resin, a calculation unit which calculates a compensation amount of the suck back speed, based on a difference between the pressure of the resin at a time when sucking back is completed and a predetermined target pressure, and a speed determination unit that newly determines the suck back speed based on the compensation amount.

To provide an injection molding machine which includes: a melting unit including a screw rotating about a rotation axis and having a groove forming surface on which a groove is formed and a barrel provided with a communication hole in a facing surface facing the groove forming surface, and configured to plasticize a material to generate a plasticized material and make the plasticized material flow out of the communication hole; a heating unit configured to heat the melting unit; an injection nozzle in communication with the communication hole and configured to inject the plasticized material into a mold; an injection control unit including a cylinder coupled to the communication hole and a plunger; a pressure detection unit configured to detect a pressure of the plasticized material flowing into the communication hole; and a control unit. The control unit controls the injection control unit to execute, based on a detected value, at least one of a metering operation of metering the plasticized material in the communication hole in the cylinder, and an injecting operation of injecting the plasticized material in the cylinder into the mold via the injection nozzle.

A method of influencing a backpressure length and/or a screw return speed in an axially extending plasticizing cylinder of a plasticizing unit for an injection moulding machine including a plasticizing screw arranged displaceably and rotatably in a cylinder bore of the plasticizing cylinder. Metering of plastic granulate fed to the plasticizing unit is carried out in dependence on the desired backpressure length in the plasticizing unit, and the plasticizing unit is operated in underfed mode.

A remote controller can be provided on any apparatus that employs feedback control from a native controller to add functionality to the apparatus where the native controller is not capable of providing such functionality independently.

A control device for an injection molding machine is equipped with a pressure acquisition unit configured to acquire a resin pressure, a pressure reduction control unit configured to, after the screw has reached a predetermined metering position, reduce the resin pressure to a target pressure by performing at least one of reverse rotation and sucking back of the screw, and a standby pressure control unit configured to, after the resin pressure has reached the target pressure, keep the resin pressure within a predetermined range by causing the screw to be rotated in a state in which a position of the screw in an axial direction of the cylinder is maintained.

A measurement system for monitoring an extruder or an injection moulding machine in operation, with a measurement device that generates a radar wave signal and emits it in the extruder or in the injection moulding machine, and detects a response signal corresponding to the emitted radar wave signal; and an evaluation device, that determines a run time t, phase shift and/or intensity change I of the radar wave signal on the basis of the detected response signal, and determines at least one operating parameter of the extruder or of the injection moulding machine on the basis of the determined run time t, phase shift and/or intensity change I of the radar wave signal, wherein the operating parameter points to a wear state of the extruder) or of the injection moulding machine. Further, a corresponding method and an extruder and an injection moulding machine with such a measurement system.

A control device for an injection molding machine including a cylinder into which a resin is supplied and a screw that moves forward and rearward and rotates inside the cylinder, includes a metering control unit that performs metering of the resin inside the cylinder by controlling forward rotation and rearward movement of the screw until the screw has been moved rearward to a predetermined metering position, based on predetermined metering conditions, a rearward movement speed acquisition unit acquiring a rearward movement speed of the screw, a speed determination unit that determines a suck back speed for causing a resin pressure to reach a target pressure, based on the rearward movement speed acquired during metering by the rearward movement speed acquisition unit, and a suck back control unit causing the screw to move further rearward based on the suck back speed, after the screw has reached the predetermined metering position.

A control device for an injection molding machine that performs a metering of a resin while the resin is being melted inside a cylinder, includes a pressure acquisition unit that acquires a pressure of the resin, a reverse rotation control unit that causes a screw to be rotated in reverse so as to reduce the pressure of the resin, after the screw has been moved rearward to a predetermined metering position, a judgment unit that judges whether or not the pressure of the resin has reached a predetermined rearward movement initiation pressure, after the reverse rotation of the screw is started, and a rearward movement control unit which causes the screw to be moved rearward, in the case it is judged that the pressure of the resin has reached the rearward movement initiation pressure.

A control device for an injection molding machine is equipped with a pressure acquisition unit that acquires a pressure of a resin, a reverse rotation control unit that causes a screw to be rotated in reverse, after the screw has reached a predetermined metering position, a measurement unit that measures an elapsed time or a rotation amount of the screw from when the screw has reached the predetermined metering position, and a rearward movement control unit that initiates sucking back of the screw in an overlapping manner with the reverse rotation of the screw, in the case that a predetermined rearward movement initiation time has elapsed, or in the case that the screw has been rotated by a predetermined rearward movement initiation rotation amount, from when the screw has reached the predetermined metering position.