There is described a hose for a molding apparatus. The hose comprises a multilayer-structure comprising at least a core tube having a conveying space for receiving and guiding a molten polymer, a heating device and a plurality of layers arranged around the core tube and on top of one another. At least one of the core tube and/or one or more of the plurality of layers comprises graphene-based material and/or pyrolytic graphite and/or silicon oxide (SiOx).

[Problem] To provide an injection apparatus including a flow path switching mechanism that is simple in construction and low in cost.

[Solution] An injection apparatus (1) includes a plasticization device (2) for melting resin, a first and second plunger injection devices (4, 5) for measuring an amount of resin and injecting the resin, an injecting portion (8), and a flow path switching block (7) that connects the plasticization device, the first and second plunger injection devices and the injecting portion together. A first to fourth connecting flow paths (23a, 23b) and a flow path switching valve (21) are provided in the flow path switching block (7). The plasticization device (2), the first plunger injection device (4), the injecting portion (8) and the second plunger injection device (5) are connected to the first to fourth connecting flow paths (23a, 23b), respectively. When the flow path switching valve (21) is switched to a first position, the first and second connecting flow paths (23a, 23b) communicate with each other, and the third and fourth connecting flow paths (23c, 23d) communicate with each other, whereas when the flow path switching valve (21) is switched to a second position, the first and fourth connecting flow paths (23a, 23d) communicate with each other and the first and third connecting flow paths (23b, 23c) communicate with each other.

An injecting machine includes an injection cylinder, a plunger, a plunger moving mechanism, and a mixing mechanism. The plunger is reciprocally received in the injection cylinder for moving between an advanced position and a retracted position, with the injecting a liquid mixture of two different liquid materials as the plunger moves to the advanced position. The plunger moving mechanism causes the plunger to move between the advanced position and the retracted position. The mixing mechanism is disposed on the injection cylinder for mixing the two different liquid materials together to feed the liquid mixture into the injection cylinder. The plunger includes a front portion having a helical groove formed on an outer circumferential surface thereof to allow the liquid mixture fed from the mixing mechanism to pass through the helical groove for collecting in a forward space formed forward of the front portion of the plunger.

An injecting machine for two different liquid material includes an injection cylinder having a nozzle disposed on a distal end thereof. A plunger is reciprocally received in the injection cylinder for undergoing reciprocating movement between an advanced position and a retracted position, with the plunger injecting a liquid mixture of the two different liquid materials as the plunger moves to the advanced position. A moving mechanism causes the plunger to reciprocate between the advanced position and the retracted position. A mixing mechanism is disposed on the injection cylinder for mixing the two different liquid materials together to feed the liquid mixture into the injection cylinder. A support plate supports a proximal portion of the injection cylinder. The mixing mechanism is supported in its entirety by the injection cylinder.

An injection apparatus (100) for injecting molten plastic into a mold for molding one or more hollow articles, in particular, bottle preforms; the injection apparatus (100) comprisingtwo injectors (1, 2), each defining a respective longitudinal axis (X, X), adapted to receive the molten plastic and inject it alternately into the mold; and a conduit (3, 31, 32, 33), having an inlet opening (30) for the molten plastic, adapted to be connected to a plasticization apparatus (102) and to conduct the molten plastic from the plasticization apparatus (102) towards the two injectors (1, 2); wherein the length of said conduit (3) is less than the length (Ltot) of each of the two injectors (1, 2) along the respective longitudinal axis (X, X).

After the injection shaft moves backward and the gas is supplied into the injection chamber, it is desired to accurately control the gas supply amount in the injection device in which the injection shaft is moved forward to compress and dissolve the gas in the molding material in the injection chamber. An injection device of the disclosure supplies a gas into an injection chamber via a gas supply hole which passes through an injection shaft and is opened at a tip surface of the injection shaft. The injection device and a gas dissolution method thereof according to the disclosure perform backward and forward movement of the injection shaft for a plurality of cycles. The injection device of the disclosure has at least one seal ring and at least one piston ring aligned in an axial direction on an outer circumferential surface of the injection shaft.

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).

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 motor core manufacturing device of the present disclosure includes a mold that holds a motor core including a resin fill section, a chamber that is formed to the mold and that includes a one-end portion thereof communicating with a resin composition fill path in communication with the resin fill section, a plunger that conveys a resin composition with thermoset properties that has been conveyed to the chamber toward the resin composition fill path, a heating apparatus that is arranged inside the mold, or that is arranged inside the mold and at a periphery of the chamber, and an extrusion machine that conveys the resin composition to the chamber while kneading so as to introduce the resin composition into the chamber. The extrusion machine includes an extrusion conveyance path in an interior for conveying the resin composition, a screw that is arranged inside the extrusion conveyance path, and that conveys the resin composition while kneading, and a first thermoregulation mechanism that is arranged at least in part of the interior of the screw.