An injection apparatus (100) for injecting molten plastic, in particular PET, into a mold for molding bottle preforms; the injection apparatus (100) comprisinga first injector (1) and a second injector (2) adapted to receive molten plastic and inject it into the mold alternately to each other; a conduit (8) adapted to carry molten plastic from a plasticization apparatus (102) towards the first injector (1) and towards the second injector (2); a third injector (3) provided with a piston (32), the third injector (3) being connected to the conduit (8) so as to receive molten plastic from the conduit (8) and then inject it into the conduit (8); actuation means (34) adapted to cause the piston (32) of the third injector (3) to move forward to inject the molten plastic into the conduit (8); wherein said actuation means (34) are adapted to control the backward movement of the piston (32) of the third injector (3) while it receives the molten plastic from the conduit (8).

An injection apparatus (100) for injecting molten plastic, in particular PET, into a mold for molding bottle preforms; the injection apparatus (100) comprisinga first injector (1) and a second injector (2) adapted to receive molten plastic and inject it into the mold alternately to each other; a conduit (8) adapted to carry molten plastic from a plasticization apparatus (102) towards the first injector (1) and towards the second injector (2); a third injector (3) provided with a piston (32), the third injector (3) being connected to the conduit (8) so as to receive molten plastic from the conduit (8) and then inject it into the conduit (8); actuation means (34) adapted to cause the piston (32) of the third injector (3) to move forward to inject the molten plastic into the conduit (8); wherein said actuation means (34) are adapted to control the backward movement of the piston (32) of the third injector (3) while it receives the molten plastic from the conduit (8).

The present invention relates to a volume pulsed deformation plasticating and conveying method and device by an eccentric rotor. The rotation of the eccentric rotor and the rolling of the rotor in the inner cavity of a stator during constant reverse revolutions cause the volume of the material between the eccentric rotor and the stator to periodically change alternatively along the axial direction and the radial direction of the stator, thereby enabling the volume pulsed deformation plasticating and conveying of the material. The volume pulsed deformation plasticating and conveying device consists of a stator, of which the inner cavity comprises multiple alternatingly disposed spiral segments and straight segments, and an eccentric rotor comprising multiple alternatingly disposed eccentric spiral segments and eccentric straight segments. The eccentric rotor is disposed in the inner cavity of the stator. The eccentric spiral segments and the eccentric straight segments of the eccentric rotor correspond one-to-one with the spiral segments and straight segments of the stator. The present invention can be used as the extruding system of an extruder or be combined with different plunger injection units to form a plasticating injection device of an injection molding machine. The present invention has a short thermo-mechanical distance for the materials, low energy consumption, and wide adaptability.

To provide an injection molding machine which includes: a melting unit including a screw rotating about a rotation axis and having a groove forming surface on which a groove is formed and a barrel provided with a communication hole in a facing surface facing the groove forming surface, and configured to plasticize a material to generate a plasticized material and make the plasticized material flow out of the communication hole; a heating unit configured to heat the melting unit; an injection nozzle in communication with the communication hole and configured to inject the plasticized material into a mold; an injection control unit including a cylinder coupled to the communication hole and a plunger; a pressure detection unit configured to detect a pressure of the plasticized material flowing into the communication hole; and a control unit. The control unit controls the injection control unit to execute, based on a detected value, at least one of a metering operation of metering the plasticized material in the communication hole in the cylinder, and an injecting operation of injecting the plasticized material in the cylinder into the mold via the injection nozzle.

To provide an injection molding machine which includes: a melting unit including a screw rotating about a rotation axis and having a groove forming surface on which a groove is formed and a barrel provided with a communication hole in a facing surface facing the groove forming surface, and configured to plasticize a material to generate a plasticized material and make the plasticized material flow out of the communication hole; a heating unit configured to heat the melting unit; an injection nozzle in communication with the communication hole and configured to inject the plasticized material into a mold; an injection control unit including a cylinder coupled to the communication hole and a plunger; a pressure detection unit configured to detect a pressure of the plasticized material flowing into the communication hole; and a control unit. The control unit controls the injection control unit to execute, based on a detected value, at least one of a metering operation of metering the plasticized material in the communication hole in the cylinder, and an injecting operation of injecting the plasticized material in the cylinder into the mold via the injection nozzle.

A process of forming molded articles using an injection molding apparatus is provided. The process includes providing a thermoplastic material to the injection molding apparatus. The thermoplastic material is heated such that the thermoplastic material is in a molten state. The molten thermoplastic material is injected into at least one mold cavity of the injection molding apparatus using an injection element. A melt pressure of the thermoplastic material filling the at least one mold cavity is monitored using a sensor. The sensor provides a signal indicative of melt pressure in the cavity to a controller. The controller controls the injection element thereby changing melt pressure of the thermoplastic material filling the at least one mold cavity based on the signal to reach a target cavity pressure. A molded article is formed by reducing a mold temperature of the thermoplastic material within the at least one mold cavity.

A control method for an injection moulding system having an extruder, feeding material continuously to an accumulator, portioning material intermittently to an injection device, wherein the control method is configured to drive the extruder at a high speed or at a low speed respectively, the high speed and the low speed defining an extruder speed interval, the method comprising acquiring a value for an actual positional change for the accumulator (POS.sub.ACT), comparing the value for the actual positional change (POS.sub.ACT) with a predicted value for the positional change (POS.sub.PRED), and adjusting a speed of the extruder based on a result of the comparison.

A plasticizing device includes a first flat screw including a first groove forming surface in which a groove is formed and configured to rotate; a second flat screw including a second groove forming surface in which a groove is formed and configured to rotate; a barrel including a first facing surface facing the first groove forming surface and a second facing surface facing the second groove forming surface and formed with a communication hole through which a plasticized material is fed outside; and a heating section configured to heat the material supplied to the grooves of the first flat screw and of the second flat screw.

An injection molding machine is configured with: a plasticizing unit configured to cause a supplied thermoplastic resin to be in a completely molten state; a mixing and kneading unit configured to receive the thermoplastic resin in the completely molten state by the plasticizing unit and also configured to receive reinforcing fiber for mixing and kneading the thermoplastic resin and the reinforcing fiber while heating; and a kneading and injection unit configured to inject the thermoplastic resin and the reinforcing fiber, both mixed and kneaded together, into a cavity in a clamping device.

An injection molding machine is configured with: a plasticizing unit configured to cause a supplied thermoplastic resin to be in a completely molten state; a mixing and kneading unit configured to receive the thermoplastic resin in the completely molten state by the plasticizing unit and also configured to receive reinforcing fiber for mixing and kneading the thermoplastic resin and the reinforcing fiber while heating; and a kneading and injection unit configured to inject the thermoplastic resin and the reinforcing fiber, both mixed and kneaded together, into a cavity in a clamping device.