A conveying device for conveying a viscous material from a container includes a follower plate that can be inserted into the container, and a pump by means of which the viscous material can be conveyed through the follower plate. Moreover, a measuring chamber for accommodation of a measuring sample of the viscous material is provided. The measuring chamber includes a closable material inlet opening for this purpose. A closable disposal line leads away from the measuring chamber. Moreover, a closable material return line extends from the measuring chamber via the follower plate into the container. The conveying device also includes a controller that is designed and can be operated appropriately such that it determines the compressibility of each of multiple measuring samples. The controller opens the disposal line or the material return line to the measuring sample present in the measuring chamber as a function of the compressibility thus determined.

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.

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.

An injection molding machine includes: a plunger provided inside a barrel and capable of moving forward and backward in an axial direction thereof and rotating about an axis thereof; a feed hole for feeding a molding material in liquid form into a front of the plunger; a packing provided on a backward side of the feed hole to prevent the molding material fed through the feed hole from flowing backward along the plunger; and a controller for controlling a retracting movement of the plunger based on pressure of the molding material fed from the feed hole to thereby perform metering. In this configuration, at least part of the feed hole is covered by a side surface of the plunger at least from start to end of the retracting movement.

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.

Methods and systems of delivering liquid additives in a molding system are provided. A charging sensor is provided to monitor the status of the injection charging mechanism of the molding system which charges, meters or doses an injection volume of molding material. A dosing instruction is generated based on the charging status signal. The additive pump controls the delivering of the liquid additives into the injection unit based on the dosing instruction, while the injection charging mechanism is charging the injection volume of molding material.

A system, method and apparatus for controlling an injection unit to transfer a material to a mold cavity includes a first actuator and a second actuator, and a controller that is operatively connected to the first actuator and the second actuator. The first and second actuators are coupled to a ram of the injection unit. The first actuator rotates the ram within the barrel, and the second actuator translates the ram within the barrel. During a material fill stage of an injection cycle, the controller controls the first actuator to rotate the ram within the barrel. The controller also controls the second actuator to translate the ram within the barrel, and controls the second actuator to retract the ram away from a nozzle of the injection unit while exerting a compression force on the ram towards the nozzle.

A plasticizing apparatus, includes: a drive motor; a rotor that is rotated around a rotation axis by the drive motor and that has a groove forming surface on which a groove is formed; a barrel that has a facing surface facing the groove forming surface and that includes a communication hole in the facing surface; a heating portion that heats a material supplied to between the groove and the barrel; and a controller that controls the drive motor and the heating portion to plasticize the material supplied to between the groove and the barrel and discharge the material from the communication hole, the facing surface includes a first region and a second region that is closer to the communication hole than is the first region, the controller controls the heating portion to set a temperature of the second region to be higher than a temperature of the first region, and the controller controls the heating portion to reduce a temperature difference between the first region and the second region when the material includes a crystalline resin as compared with a case where the material includes an amorphous resin.

Systems and approaches for controlling an injection molding machine having a mold forming a mold cavity include feeding a molten polymer into a barrel containing a screw disposed in a first position, advancing the screw a first instance, from the first position to a second position, to inject the molten polymer into the mold cavity to form a molded part, and ejecting a first molded part or a first set of molded parts from the mold cavity. Further, the screw is advanced a second instance, from the second position to a third position, to inject the molten polymer into the mold cavity to form an additional molded part. A second molded part or a second set of molded parts is ejected from the mold cavity. After the second advancing instance, a recovery profile is commenced in which the screw is returned to the first position.

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.