An injection molding device includes a first injection section, a second injection section, a mold mounting unit and a hot runner, where a posture in which a first plasticizing device and a first plunger are in fluid communication and a posture in which the first plunger and the hot runner are in fluid communication can be selected as a posture of a first distributor, a posture in which a second plasticizing device and a second plunger are in fluid communication and a posture in which the second plunger and the hot runner are in fluid communication can be selected as a posture of a second distributor, and the hot runner includes a first sprue runner, a second sprue runner, and a nozzle, the nozzle being in fluid communication with both sprue runners and can be in fluid communication with the mold (M).

A material supplying device includes a plasticizing section configured to plasticize a material to generate a plasticization material; a nozzle configured to supply the plasticization material to the outside; a supply control mechanism that is provided in a flow path communicating with the plasticizing section and the nozzle, and that is configured to adjust a supply amount of the plasticization material from the nozzle to the outside; a pressure sensor configured to measure the pressure of the plasticization material in the flow path; and a control section configured to control an operation of the supply control mechanism, wherein the control section is configured to calculate a backlash value indicating backlash of the supply control mechanism based on detection data including a detection value output from the pressure sensor, and the detection data is data including in time series the detection values output from the pressure sensor.

An injection molding machine includes a plasticizing unit having a plasticizing cylinder and a material-conveying device that is movable in the plasticizing cylinder and powered by a material-conveying drive, a material-conveying drive control, which is coupled with the material-conveying drive and is designed to control operating parameters of the material-conveying drive, a closing unit having an injection molding tool that is connected with an outlet nozzle of the plasticizing cylinder, as well as a closing unit control, which is coupled with a closing unit drive of the closing unit and is designed to control operating parameters of the closing unit drive. The injection molding machine further includes one or more dieletric or acoustic sensors which are disposed in the cavity of the injection molding tool or close to the cavity of the injection molding tool and are designed to determine the dielectric polarizability, mobility of free load carriers and/or acoustic material responses of a molding material in the cavity of the injection molding tool. A sensor control is coupled with the dielectric or acoustic sensor(s) and is designed to ascertain a time-dependent degree of crystallization and a time-dependent median temperature of the molding material in the cavity of the injection molding tool from the dielectric polarizability, mobility of free load carriers and/or acoustic material responses determined by the dielectric sensor(s) and, depending on the ascertained degree of crystallization and the ascertained median temperature, to actuate the material-conveying drive control and/or the closing unit control to adjust the operating parameters of the material-conveying drive and/or of the closing unit drive.

An injection molding apparatus includes an injection unit configured to inject a plasticized material obtained by plasticizing a material of the molded article into the molding die, a mold clamping unit to which the molding die is attached and which is configured to perform mold clamping on the molding die, and a controller configured to control the injection unit and the mold clamping unit, wherein the injection unit includes a plasticizing unit configured to plasticize the material to generate the plasticized material, a nozzle configured to supply the plasticized material to the molding die, a flow path configured to communicate the plasticizing unit and the nozzle with each other, and a supply adjustment mechanism provided to the flow path and configured to adjust a supply amount of the plasticized material from the nozzle to the molding die, the supply adjustment mechanism includes a cylinder coupled to the flow path, a plunger disposed in the cylinder, and a driver configured to drive the plunger, and the flow path and the cylinder are integrally formed of a first member.