An injection molding apparatus comprising an injection molding machine, a manifold, a closure valve pin, a first actuator having a linear or axial driver, a second actuator comprising a rotor interconnected to either the closure valve pin or to a second valve pin such that either the closure valve pin or the second valve pin is rotatably driven in unison with the rotor around the rotation axis, the closure pin or second pin being disposed and rotatable within the flow of injection fluid flowing through a flow channel leading to a mold cavity.

A shut-off nozzle includes a nozzle body portion, a needle valve, and a needle driving mechanism including a cylinder mechanism and a spring holder. The nozzle body portion includes a valve housing and the valve housing has a needle hole, into which a rear end portion of the needle valve is insertable, and a spring holder hole. The spring holder is inserted in the spring holder hole in a direction orthogonal to the axial direction in a state in which slide in the axial direction is allowed, and both ends of the spring holder are fixed to the cylinder mechanism. A central portion of the spring holder presses the rear end portion of the needle valve. Enlargement portions are formed in both side surfaces of the valve housing continuous with the spring holder hole.

An injection molding apparatus comprising a clamp plate, a heated manifold, an actuator, a mold and a cooling device, wherein the cooling device comprises: a heat transmitter comprising a distal arm or member and a proximal base or member, the distal arm or member or member being mounted by a spring loadable interconnection or engagement to or with the proximal base or member, the clamp plate, the mold, the manifold, the actuator and the heat transmitter being assemblable together in an arrangement wherein the spring loadable interconnection is loaded urging the distal end surface of the distal arm or member into compressed engagement with the clamp plate.

Provided is a co-injection molding structure, mainly including a co-injection molding device and a molding die. The co-injection molding device includes a valve needle displaceable in a cylinder block. The valve needle is provided with a channel a first valve and a second valve. The channel communicates with a first feed tube and a second feed tube. The cylinder block communicates with a mold cavity of a molding die and the channel. When the valve needle is in a first position, the second valve will close the second feed tube such that a first material is injected into the mold cavity. When the valve needle is in a second position, the first valve will close the first feed tube such that a second material is injected into the mold cavity and covered by the first material, thereby filling an end of the mold cavity.

An injection molding apparatus including an actuator interconnected to a rod or valve pin having a smooth continuous cylindrical outer surface and one or more discontinuous or relieved or relieved portions formed as discontinuities in the cylindrical outer surface and adapted to be disposed within a fluid flow channel, the one or more discontinuous or relieved portions being configured and arranged along the axial length of the pin or rod such that the flow of injection fluid over or past the one or more discontinuous or relieved portions is modified to flow at substantially different rates or velocities or in substantially different flow patterns relative to rate or velocity or pattern of flow of injection fluid over or past the smooth continuous cylindrical outer surface.

A method for controlling the filling of at least one cavity in a device for producing an object, in particular in an injection molding machine, wherein a melt is inserted into the cavity through an opening, and the width thereof is altered, wherein the width of the opening is also to be changed and adjusted, that is, fixed, in a position between a closed position and a maximal open position.

Disclosed herein is a novel shut-off nozzle for use with an injection molding system for creating and injecting foaming polymers to form products and other components. The shut-off nozzle is designed to increase cell nucleation during the foaming process, increase the pressure drop rate as the polymer is injected into a mold, and stop drooling of the foamed polymer at the end of an injection cycle. The shut-off nozzle includes an angled shut-off needle, which significantly reduces the amount of waste in each injection cycle and a water-cooling circuit to rapidly cool and solidify the molten polymer remaining in the shut-off nozzle at the end of each injection cycle.

Disclosed herein is a novel shut-off nozzle for use with an injection molding system for creating and injecting foaming polymers to form products and other components. The shut-off nozzle is designed to increase cell nucleation during the foaming process, increase the pressure drop rate as the polymer is injected into a mold, and stop drooling of the foamed polymer at the end of an injection cycle. The shut-off nozzle includes an angled shut-off needle, which significantly reduces the amount of waste in each injection cycle and a water-cooling circuit to rapidly cool and solidify the molten polymer remaining in the shut-off nozzle at the end of each injection cycle.

Disclosed herein are novel methods for forming a polymer part including providing an injection molding system with a shut-off nozzle, where the shut-off nozzle includes a main body, a nozzle tip body, a flow path through the main body and the nozzle tip body, a nozzle tip, and a shut-off mechanism. The nozzle tip includes an internal passage and a cooling mechanism. The shut-off mechanism includes a passageway intersecting the flow path at an angle and a pin positioned in the passageway. The method further includes the steps of initiating an injection molding cycle by injecting molten polymer through the shut-off nozzle into a cavity of a mold, actuating the shut-off mechanism to move the pin in the passageway into the intersection of the passageway and flow path, and initiating the cooling mechanism to solidify molten polymer in the nozzle tip to form a solid slug.

A shut-off nozzle includes a nozzle body portion, a needle valve, and a needle driving mechanism including a cylinder mechanism and a spring holder. The nozzle body portion includes a valve housing and the valve housing has a needle hole, into which a rear end portion of the needle valve is insertable, and a spring holder hole. The spring holder is inserted in the spring holder hole in a direction orthogonal to the axial direction in a state in which slide in the axial direction is allowed, and both ends of the spring holder are fixed to the cylinder mechanism. A central portion of the spring holder presses the rear end portion of the needle valve. Enlargement portions are formed in both side surfaces of the valve housing continuous with the spring holder hole.