Shut-off nozzle for a molding machine, comprising a valve housing having at least one fluid channel, wherein the at least one fluid channel is designed to guide apreferably liquid and/or plasticfluid and a valve element which is rotationally mounted about an axis of rotation relative to the valve housing, which valve element has at least one through-opening for the passage of the fluid and is designed to vary a flow cross-section between the at least one fluid channel and the at least one through-opening by carrying out a rotational movement and thus to influence a flow of the fluid, wherein the at least one through-opening has a cross-section in a plane orthogonal to its longitudinal extension through the valve element which has a larger dimension along the axis of rotation of the valve element than perpendicular thereto.

A method is described for injecting a molten material from a nozzle into a mold during an injection molding process. The molten material is guided towards the nozzle via a tip insert which is provided with an internal central cavity and houses a valve pin translatable to reach one end of the tip insert and there adjust a flow of molten material. The molten material travels the central cavity, deviates for a first time away from said axis to exit the internal central cavity through at least one first channel which takes it into an auxiliary chamber, approaches the nozzle traveling a distance inside the auxiliary chamber, deviates for a second time and re-enters the internal central cavity through at least one second channel, and travels along a final section of internal central cavity to reach the nozzle and proceeds inside the mould.

A method for producing gramophone records by injection moulding, comprises the steps of heating polymeric material to liquefy said material, supplying liquid polymeric material under pressure from a feed zone to a space between two mould parts via a nozzle. The liquid polymeric material is passed through a single passage located in one of the mould parts and forced under pressure through the nozzle into said space. Polyethylene terephthalate isophthalic acid modified copolymer is used as said polymeric material.

A component for a nozzle for injecting molten plastic into a molding cavity of a container, in particular of a test tube or a bottle preform, the component comprising a first body in which a shutter can slide along an axis; wherein the first body has a wall which extends about said axis; wherein said wall is provided with a first zone adapted to guide the sliding of the shutter along the axis, and a second zone which delimits a first stretch of a channel for the molten plastic; wherein said first body is provided with at least one through hole which crosses said wall, in particular transversely to the axis, which allows the molten plastic to pass through, in particular to enter, said first stretch of the channel.

A shut-off nozzle includes a nozzle body portion having an in-nozzle flow path formed therein, and a needle valve that is inserted into the nozzle body portion coaxially with the nozzle body portion and is configured to open and close an outlet of the in-nozzle flow path. A cylindrical portion is formed in the vicinity of a tip portion of the needle valve. A cylindrical hole portion is formed in the vicinity of a tip portion of the in-nozzle flow path, the cylindrical hole portion being a cylindrical hole. The cylindrical portion is configured to be fitted into the cylindrical hole portion in a case where the needle valve is driven in a forward direction.

A shut-off nozzle includes a nozzle body portion having an in-nozzle flow path formed therein, and a needle valve that is inserted into the nozzle body portion coaxially with the nozzle body portion and is configured to open and close an outlet of the in-nozzle flow path. A cylindrical portion is formed in the vicinity of a tip portion of the needle valve. A cylindrical hole portion is formed in the vicinity of a tip portion of the in-nozzle flow path, the cylindrical hole portion being a cylindrical hole. The cylindrical portion is configured to be fitted into the cylindrical hole portion in a case where the needle valve is driven in a forward direction.

An injection nozzle is attachable to a tip end of a heating cylinder and having an in-nozzle flow path formed therein. The injection nozzle is attached to the heating cylinder by being pressed against the heating cylinder by a nozzle pressing member that is fixed to an end surface of a tip end of the heating cylinder. An outer peripheral surface of the injection nozzle has a sensor hole that is opened at a position contacting the nozzle pressing member, and a temperature sensor is inserted into the sensor hole.

An injection molding apparatus (10) comprising: one or more valves each comprised of a valve pin (1040, 1041, 1042) adapted to be driven upstream and downstream through a downstream channel (1006) that has a downstream channel portion (1006ds) that has a control surface (1008), the control surface (1008) forming a channel or restriction gap (CG, 1006rg), the valve pin (1041) being controllably drivable upstream and downstream through the channel or restriction gap (CG, 1006rg) at a single selected rate of upstream acceleration up to a selected reduced upstream velocity that is less than a maximum velocity at which the valve pin (1041) is drivable, the size or configuration of the channel or restriction gap (CG, 1006rg) and the single selected rate of upstream acceleration being selected in combination with each other to control flow of injection fluid (18) through the channel gap (CG, 1006rg).

An apparatus for injecting a molten plastic material into a mold is described. The apparatus includes a heated manifold (manifold) with channels to distribute molten material inside it, and a heated injector, to inject molten material to the mold cavity, equipped with a translatable shutter to regulate the flow of the injected molten material. An actuator is attached to the manifold to receive molten material from it to send to the injector and move the shutter. The actuator includes a piston connected to the plug, and a first conduit to bring a pressurized fluid from the outside to the piston. A plate includes a second internal conduit to bring pressurized fluid to the injector, where a gap separates the plate and the actuator. A connecting member is mounted to cross the gap and carry pressurized fluid from the plate to the actuator.

An apparatus for injecting a molten plastic material into a mold is described. The apparatus includes a heated manifold (manifold) with channels to distribute molten material inside it, and a heated injector, to inject molten material to the mold cavity, equipped with a translatable shutter to regulate the flow of the injected molten material. An actuator is attached to the manifold to receive molten material from it to send to the injector and move the shutter. The actuator includes a piston connected to the plug, and a first conduit to bring a pressurized fluid from the outside to the piston. A plate includes a second internal conduit to bring pressurized fluid to the injector, where a gap separates the plate and the actuator. A connecting member is mounted to cross the gap and carry pressurized fluid from the plate to the actuator.