An inspection method for an injection molding device includes: a first step of acquiring a first detection value from a sensor using a test mold having the sensor, the sensor measuring a temperature or pressure of a molten material injected from a first injection molding device into a cavity section demarcated by a fixed mold and a moving mold; a second step of injecting a molten material from a second injection molding device into the cavity section and acquiring a second detection value from the sensor; and a third step of performing an inspection using the first detection value and the second detection value.

In order to injection mold parts at a constant flow front velocity in a mold cavity of an injection molding system, particularly where the mold cavity has a varying thickness along its length, mold modeling software is used to calculate the cross-sectional area as a function of the distance from the gate, percentage of fill, or length of the mold cavity. Based on that cross-sectional area, the mold modeling software determines an appropriate recommended ram force profile and/or melt pressure profile that would result in filling the mold cavity at a constant flow rate. An injection molding system is then operated according to the recommended ram force profile and/or melt pressure profile.

Provided is a maintenance method for a discharge unit which has a nozzle hole and plasticizes a material containing a thermoplastic resin to generate a plasticized material. This maintenance method includes a heating step of heating a material or a plasticized material present in a flow path which communicates with a nozzle hole and through which the material or the plasticized material passes at a temperature equal to or higher than the thermal decomposition temperature of the material or the plasticized material, and a releasing step of releasing the material or the plasticized material thermally decomposed in the heating step from the flow path.

In one aspect, a method of molding a multilayer article comprises causing a surface layer material injection unit to commence injecting a surface layer material into a mold cavity via a surface layer material channel. Then, an internal layer material injection unit commences injecting an internal layer material into the mold cavity an internal layer material channel. Then, during application of a hold pressure upon the surface layer material in the surface layer material channel and with the surface and internal layer material injection units in fluid communication with one another, a pullback stroke is effected at the internal layer material injection unit. After a delay interval, at least one physical parameter indicative of a post-pullback pressure of the internal layer material is detected, and an indicator of pullback effectiveness is generated based on the post-pullback pressure indicated by the at least one physical parameter relative to a threshold pressure.

In one aspect, a method of molding a multilayer article comprises causing a surface layer material injection unit to commence injecting a surface layer material into a mold cavity via a surface layer material channel. Then, an internal layer material injection unit commences injecting an internal layer material into the mold cavity an internal layer material channel. Then, during application of a hold pressure upon the surface layer material in the surface layer material channel and with the surface and internal layer material injection units in fluid communication with one another, a pullback stroke is effected at the internal layer material injection unit. After a delay interval, at least one physical parameter indicative of a post-pullback pressure of the internal layer material is detected, and an indicator of pullback effectiveness is generated based on the post-pullback pressure indicated by the at least one physical parameter relative to a threshold pressure.

An injection molding machine includes an injection apparatus that injects an injection material into a mold and a clamping apparatus that clamps the mold. An injection control device that controls injection of the injection material by the injection apparatus is connected to a clamping control device to communicate data therewith, the clamping control device controlling a magnet clamp of the clamping apparatus.

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 machine performs a plasticization process causing a screw to move backward during rotation to plasticize a granular resin supplied to a heating cylinder through a hopper in accordance with a plasticization condition, a purging process causing the screw to move forward in the heating cylinder separated from a mold to discharge a molten resin plasticized by the plasticization process, a correction process causing a learned model having learned in advance to correct the plasticization condition so as to bring a waveform data piece close to an ideal state, the waveform data piece indicating a change in a physical quantity obtained during a course of discharging the molten resin by the purging process, and an injection process causing the screw to move forward in the heating cylinder in contact with the mold that is clamped to inject the molten resin plasticized by the plasticization process into a cavity.

A pressure measurement device mountable to an injection unit that injects molding material of an injection molding machine, and an injection molding machine are provided. The pressure measurement device includes: a measurement cylinder mounted to the injection unit and through which the molding material injected by the injection unit flows; a plurality of dies mounted to the measurement cylinder and through which the molding material flows, and having different specifications; a flow path switching pin that selectively switches a discharge destination of the molding material to any one of the plurality of dies; and a pressure sensor that measures a pressure of the molding material in the measurement cylinder.

A plasticizing device includes a flat screw including a groove forming surface in which a groove is formed, a barrel having a facing surface and a communication hole formed in the facing surface, the communication hole allowing a plasticized material to flow out, a heating unit, a flow path through which the plasticized material flows, a nozzle communicating with the flow path, a plurality of measurement units configured to measure pressures or temperatures in the flow path, an aspiration delivery unit, including a cylinder, having a branch flow path and a plunger configured to move in the cylinder so as to aspirate the plasticized material into the branch flow path or deliver the aspirated plasticized material to the nozzle, and a control unit configured to identify a state of the plasticized material in the flow path based on measurement values of the measurement units.