An injection molding method includes: a plasticizing process of feeding a resin pellet and additive components to a heating cylinder including a screw that can rotate around a rotation axis and can advance and retreat along the rotation axis, and generating molten resin by rotating the screw in a normal direction; and an injection process of injecting to a cavity the molten resin containing the additive components. In the plasticizing process, retreat operation of forcibly retreating the screw is performed at a predetermined velocity by a predetermined stroke or a predetermined time.

An injection molding method includes: a plasticizing process of feeding a resin pellet and additive components to a heating cylinder including a screw that can rotate around a rotation axis and can advance and retreat along the rotation axis, and generating molten resin by rotating the screw in a normal direction; and an injection process of injecting to a cavity the molten resin containing the additive components. In the plasticizing process, retreat operation of forcibly retreating the screw is performed at a predetermined velocity by a predetermined stroke or a predetermined time.

A method of determining a solution state of a gas in a plastic melt used in a plastic shaping method includes: (vi) providing the plastic melt together with the gas in a chamber, (vii) alteringin particular reducinga volume of the chamber to alter a pressure of the plastic melt together with the gasin particular increased from a first pressure value to a second pressure value, (viii) introducing the plastic melt into a shaping cavity, (ix) computing at least one compression parameter characteristic of the compression behaviour of the plastic melt, in particular a modulus of compression, from the first pressure value and the second pressure value, and (x) determining from the at least one compression parameter whether the gas is substantially completely dissolved in the plastic melt and/or a solubility limit of the gas in the plastic melt is determined from the at least one compression parameter.

Disclosed is an oil-electricity hybrid injection molding machine, including a base, a feeding barrel, a screw rod and a power system. The oil-electricity hybrid injection molding machine utilizes a dual clutch combination with coaxial arrangement to enable the use of the same motor for injection and feeding, thereby reducing the selection specifications of the motor; on the other hand, through the use of auxiliary oil cylinders, under the oil-electricity hybrid power, the pressure, speed, and accuracy of the injection can be ensured, especially during injection

A control method for an injection molding machine including a measurement process of measuring molten resin by moving a screw backward while rotating the screw in a heating barrel for melting a resin material, a rotational speed of the screw is reduced from a timing when a backward movement speed of the screw is reduced at the measurement process before the measurement process is completed, for stopping backward movement of the screw when the measurement process is completed, and the rotational speed and a rotation direction of the screw are controlled such that a back pressure as a pressure of the molten resin measured at the measurement process becomes a target pressure lower than the back pressure of when the measurement process is completed, when a target time comes.

An embodiment of the present invention provides an injection device including a screw that includes a plurality of outer circumferential protrusions, each of the plurality of outer circumferential protrusions being provided with an outer circumferential protrusion slope and a second outer circumferential protrusion slope. A bush of the injection device includes a plurality of inner circumferential protrusions, each of the plurality of inner circumferential protrusions being provided with an inner circumferential protrusion slope and a second inner circumferential protrusion slope. A rear end of each of the plurality of outer circumferential protrusions and a front end of each of the plurality of inner circumferential protrusions include no flat surface.

A molding method produces a molded part from a polymer starting material in a molding machine, in particular an injection-molding machine. In the method, the polymer starting material is plasticized and/or fused, and at least one monomer in the gaseous state is supplied to the polymer starting material.

A molding method produces a molded part from a polymer starting material in a molding machine, in particular an injection-molding machine. In the method, the polymer starting material is plasticized and/or fused, and at least one monomer in the gaseous state is supplied to the polymer starting material.

An injection device is equipped with a brake mechanism provided on a rotary shaft of an injection motor extending toward a screw side along an axial direction of the screw and configured to brake rotation of the rotary shaft, an injection motor connecting portion extending in a direction substantially perpendicular to the axial direction, and an injection motor supporting portion connected to the injection motor connecting portion so as to be adjustable in position relative to the injection motor connecting portion, and configured to support the injection motor and the brake mechanism.

An injection molding machine includes a screw to which a tag including identification information that is readable by a reading unit is attached, a drive unit that performs rotation and advancing and retreating of the screw, and a control device that controls the drive unit, the control device performs a control of moving of the tag to a reading position at which the identification information is read by the reading unit.