Abstract: A valve-gated injection moulding device in which an actuating device of the valve pin comprises a sliding member having its walls in sliding engagement with an axial guide track. The sliding member comprises a radial opening defined by an upper and a lower contact surface. A free end of an actuating lever having two curved actuating surfaces extends radially into the opening of the sliding member. Thanks to this construction, a compact and accurate actuating device is provided which reduces radial forces on the valve pin, such that it can be operated without friction or wear. Residual radial forces are taken up by the sliding member. The stroke of the actuating device can be adjusted after mounting in a cavity plate of an injection moulding device.

Abstract: A valve-gated injection moulding device, wherein the actuating device of the valve pin comprises a first arm and a second arm. The first arm is hingingly connected in a first end tot he rearward end of the valve pin. The second end of the first arm is hingingly connect to a displacement device, which can be moved along a radial displacement trajectory. The second arm is with its first end hingingly connected to the midpoint of the first arm. The second end of the second arm is connected in a fixed hinge point to a support of the injection moulding device. In this way, using a radial actuating device, only an axial force is exerted on the valve pin. The stroke of the valve pin can easily be adjusted from outside the mould by increasing or decreasing the stroke of the piston. The actuating device is relatively small, and does not require a large re-routing of the melt passage as it is positioned radially outwardly from the longitudinal center line of the valve pin. it can be operated from outside the mould.

Abstract: Injection moulding system comprising an elongated manifold having a melt passage extending from a common inlet, branching to a number of outlets; each of which outlet is connected to a central bore (3) of a heated elongated nozzle (1) discharging into a gate (4) leading to a moulding cavity, which nozzle (1) is at least partly surrounded by a heating element (17); the heating element (17) is designed such that its diameter or cross-sectional shape is adjustable; said heating element (17) is encased by a mantle piece (21) of which the internal diameter or internal cross-sectional shape is adjustable too, and a device is provided to clamp fit the heating element (17) with respect to the nozzle (1) under the action of the mantle piece (21).

Abstract: An injection molding system having a manifold element (5) carrying a melt passage (2); the manifold element (5) being connected to an inlet (3) at one end for receiving molten material and at the other end a nozzle (7) opening into a gate (21) of the mold; the manifold element (5) being heated, and spaced from relatively large bodies, such as clamped plate elements (14) or cavity plate elements (11) which are less heated, unheated or cooled by relatively thin-walled spacer members (12); the spacer members (12), having two oppositely directed bearing surfaces the one bearing against the manifold elements (5), the other bearing against said body; and a relatively thin-walled wall part (17) extending between the bearing surfaces; the wall parts (7) having a curvature to be resilient for compression and extension in the direction from the one bearing surface towards the other bearing surface.

Abstract: Electrically heated manifold system in an injection moulding structure, the system comprising a manifold element, the manifold element being adapted to direct molten plastics material from the extruding device to the mould-cavity, and bearing an inlet-gate at one side for connection to the outlet nozzle of a plastics extruding device, an elongate bore system leading from the said inlet-gate to at least one outlet-gate at the other side of the manifold-element to connect with at least one opening in a cavity-plate having a mould-cavity, the bore system branching into as many respective outlet-gates as there are openings in the corresponding cavity-plate, the manifold-element further having at least one elongated electrical heating body provided in heating relationship with the bore system and preferably distinct there from, the electrical heating body having opposite free in- and output ends projecting from the manifold-element, the ends connected by separate electrically isolated lead-elements to the respecti