An artificial intelligence-based injection molding system in which molding conditions can be changed to manufacture fair-quality products when defective products are manufactured because of disturbances during the injection molding including an injection molding machine which performs injection molding by injecting a molding material into a mold; an injection state data acquisition unit for acquiring, during injection molding, current injection state data that includes the viscosity profile of the molding material injected into the mold and/or the injection pressure value thereof; a determination unit, which inputs the current injection state data into a molding quality maintenance model trained with predetermined target injection state data, so as to determine whether to maintain molding quality; and a molding condition setting unit for changing a preset molding condition so that the current injection state data follows the target injection state data, when the determination unit determines not to maintain the molding quality.

For each of different resins R, a zero shear viscosity no of each resin R is obtained by using a conversion function expression whose parameters are a melt flow rate (MFR) and a set temperature of a heating cylinder and is registered. Also, a purge resin required amount Wu corresponding to a viscosity difference d between the zero shear viscosity of of a former resin Rf and the zero shear viscosity os of a succeeding resin Rs is registered. When resin switching is performed, the zero shear viscosity of of the former resin Rf and the zero shear viscosity os of the succeeding resin Rs are obtained by inputting the MFR of the former resin Rf and the MFR of the succeeding resin Rs to a molding machine controller, the viscosity difference d between the zero shear viscosity of of the former resin Rf and the zero shear viscosity os of the succeeding resin Rs is obtained, an amount of a purge resin required for resin switching is obtained as a purge resin required amount Wu, and at least the obtained purge resin required amount Wu is displayed.

A method and device is provided for operating an injection molding machine. The method uses the device, which is configured for determining the viscosity index of a melt in a cavity of an injection molding tool. The device includes pressure sensor member that measures an internal mold pressure of the melt in the cavity. The device includes an evaluation member configured for evaluating sensor data generated by the pressure sensor member. The evaluation member is configured to determine the viscosity index of the melt from the evaluated sensor data. The evaluation member is configured to compare the viscosity index to a target viscosity index and accordingly adjust operation of the machine's operating parameters so that the viscosity index of the melt conforms to the target viscosity index indicative of production of an acceptable part by the injection molding machine.

For each of different resins R, a zero shear viscosity o of each resin R is obtained by using a conversion function expression whose parameters are a melt flow rate (MFR) and a set temperature of a heating cylinder and is registered. Also, a purge resin required amount Wu corresponding to a viscosity difference d between the zero shear viscosity of of a former resin Rf and the zero shear viscosity os of a succeeding resin Rs is registered. When resin switching is performed, the zero shear viscosity of of the former resin Rf and the zero shear viscosity os of the succeeding resin Rs are obtained by inputting the MFR of the former resin Rf and the MFR of the succeeding resin Rs to a molding machine controller, the viscosity difference d between the zero shear viscosity of of the former resin Rf and the zero shear viscosity os of the succeeding resin Rs is obtained, an amount of a purge resin required for resin switching is obtained as a purge resin required amount Wu, and at least the obtained purge resin required amount Wu is displayed.

An injection molding machine and a viscosity measurement method of the disclosure are provided with an injection cylinder to which a viscosity measurement unit is attachable and detachable and a control device. When setting an inner diameter of the injection cylinder or an outer diameter of the injection shaft as D. For a capillary installed to the viscosity measurement unit, a capillary inner diameter is set as d. By respectively using three or more values .sub.k of the shear rate, k being a natural number, the control device is configured to calculate injection velocities V.sub.k based on Formula (1) and automatically sets a value of the injection velocity V.sub.k within a predetermined range, among the calculated injection velocities, as an injection velocity at a time of viscosity measurement. $\left[\mathrm{Formula}\left(1\right)\right]$$\begin{array}{cc}{V}_k=\frac{d^3}{8D^2}{}_k& \left(1\right)\end{array}$

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.

Rheological measurement systems for use with systems including pressurized polymer melts and/or other viscous materials are described. In one embodiment, a rheometer is connected to an associated system with a bent, curved, or bendable tube to permit the rheometer to measure rheological properties in locations where the rheometer could not otherwise be located due to the presence of obstructions. Embodiments including rigid straight tubes for connecting a rheometer to an associated system are also described. In another embodiment, a flow-through rheometer is connected to an industry standard -20 thermowell aperture that is typically used for attaching temperature and pressure probes to a vessel containing a viscous material such as an extruder or injection molding system.

An injection molding device includes an injection device including a cylinder, a screw, and a nozzle provided at a front end of the cylinder, for discharging molten resin as the screw advances, a mold including a molded product cavity, and a resin channel between the molded product cavity and a portion abutting the nozzle, a channel pressure measuring device for acquiring channel pressure data in the resin channel, and a determination unit that determines presence/absence of clogging of a gate of the resin channel, based on features of the channel pressure data.