A molded resin component includes a first surface on which a convex portion is formed, and a second surface opposite to the first surface. The convex portion includes a molding mark formed by a valve pin of a manufacturing apparatus that manufactured the molded resin component. A shape of at least a portion of a leading-end surface of the valve pin is not transferred into the molding mark.

A system is disclosed for driving an actuator which comprises a chamber, a shutter of an injection nozzle for molten material for injection molding, and a piston translatable inside the chamber to actuate a shutter. Means are provided for the transfer of a predetermined amount of fluid between the outside and inside of the chamber, so as to bring/move the shutter from a closing position, in which there is no passage of molten material, towards an opening position, in which there is passage of molten material, by injecting the predetermined amount of fluid from the outside into the chamber or by injecting the predetermined amount of fluid from the chamber towards the outside, or vice versa.

An injection molding apparatus (5), comprising: a first fluid drive cylinder (940c, 941c, 942c), a second fluid drive cylinder (940ac, 941ac, 942ac) interconnected to a valve pin (1040, 1041, 1042), wherein the first fluid drive cylinder (940c, 941c, 942c) and the second fluid drive cylinder (940ac, 941ac, 942ac) are interconnected in an arrangement wherein reciprocating movement of a piston (940p, 941p, 942p) of the first cylinder drives concomitant back and forth movement of a piston (940ap, 941ap, 942ap) of the second cylinder and concomitant back and forth movement of the valve pin (1040, 1041, 1042); an electrically powered actuator (940, 941, 942) adapted to drive the piston of the first cylinder reciprocally according to a drive program such that the valve pin (1040, 1041, 1042) is driven between gate closed and gate open positions and selected positions therebetween.

A method for injection molding of plastic materials into a cavity of a mold by means of a molding apparatus including at least one injector having a pin valve displaceable between a fully closed position and a maximum opening position, and vice versa, in a controlled fashion in respect of its position and speed. In the opening displacement from the fully closed position to the maximum opening position, the pin valve is initially moved at a first speed and subsequently at a second speed, where the first speed is the highest opening displacement speed of the pin valve.

A method and apparatus for producing hollow articles made of injection moulded plastic material by a mould having a die within which there is inserted a core, and at least one injector including a pin valve displaceable between a closing position and an opening position for injecting the pressurized plastic material into a space comprised between the die and the core. During the injection, any flexural deflection of the core is detected and the pin valve of the or of each injector is displaced in a controlled fashion to adjust a pressure and a flow rate of the injected plastic material, so as to reduce or eliminate such deflection of the core.

Some embodiments relate to a method for the direct soling of a multilayered shoe sole. The method can provide two distinct sets of mold frames for a first and a second shoe sole layer and a distinct order for the soling of the layers. In contrast to art traditional approaches, a first layer (e.g. a midsole) is first soled to an upper in a first mold frame and subsequently a second layer (e.g. an outer sole) is soled onto said first layer in a second mold frame. The method can allows for an increased design flexibility and the inclusion of additional functional or aesthetic features, such as air pockets, undercuts, toe caps or running sole tips previously not possible with direct soling processes. Some embodiments relate to an injection molding system equipped and configured for carrying out the method.

A device is described for adjusting the linear position of one or more shutters (20) in an injection moulding system. The device comprises a body, comprising a cavity in which there can axially slide a movable element, and an adjustment element for adjustment of the axial position of the body with respect to a plate. The adjustment element is rotatably mounted between the body and the plate and comprises a threaded portion on which a corresponding thread of the body and/or of the plate is engaged.

A device is described for adjusting the linear position of one or more shutters (20) in an injection moulding system. The device comprises a body, comprising a cavity in which there can axially slide a movable element, and an adjustment element for adjustment of the axial position of the body with respect to a plate. The adjustment element is rotatably mounted between the body and the plate and comprises a threaded portion on which a corresponding thread of the body and/or of the plate is engaged.

A hot runner-type injection structure 4 is provided with: a hot runner nozzle 5; and a valve pin 6 that is provided to be able to advance and retreat in the axial line O1 direction inside the flow passage of the hot runner nozzle 5 and that opens/closes the flow passage by coming into contact/being spaced apart from a valve opening/closing part 13 which has a tip part disposed on the tip side of the hot runner nozzle 5, wherein a heat insulating groove 16, which is recessed inward toward the axial line O1 side from an outer circumferential surface and extends in the circumferential direction, is provided on the outer periphery in a valve pin contact section M in which the valve opening/closing part 13 of the hot runner nozzle 5 is formed.

A system and method for controlling an actuator which actuates an axially displaceable pin valve of an apparatus for injection molding of plastic materials, where the control system includes an electronic control unit of the actuator which adjusts at least one among position, speed and acceleration of the pin valve, and a position sensor which detects a position of a plunger of the actuator and is operatively connected to the electronic control unit. The position sensor indirectly detects the position of the plunger of the actuator.