Abstract: The identification and location of possible faults of operation and/or installation of a hot runner are obtained through the measurement of the absorption of power by the heating resistors applied to the arms and to the injectors of the hot runner. The qualitative and quantitative analysis of the power absorbed by the resistors also enables identification of the type of possible faults and the corresponding seriousness.

Abstract: An apparatus and a process for the moulding of articles made of plastic material with two components by means of a stack-mould press with a first cavity and a second cavity for the injection of the plastic material and the possible compression of the injected plastic material, in which the moulds and the countermoulds of the apparatus define respective mutually facing surfaces. Parameters indicating the mutual parallelism between said facing surfaces are detected, and the closing assembly for closing the press is controlled according to the parameters detected.

Abstract: Described herein is injecto-compression moulding of articles made of plastic material with two components by means of a press of the stack-mould type, in which the first and second countermoulds are constrained to the corresponding moulds carried by the rotating central element of the press so as to enable the respective cavities to set themselves in a position of partial opening for the injection of the plastic material within them. To both of the cavities there is then applied a closing force to bring about compression of the plastic material injected therein.

Abstract: An injector for equipment for injection moulding of plastic materials comprising at least one first heating resistor and at least one second heating resistor, which are controlled independently of one another and of which one is wound on a first area of the body of the injector extending substantially throughout the axial extension thereof and the other is wound on a second area that extends only along an axial portion of the body of the injector starting from a substantially intermediate area thereof.

Abstract: Described herein are a process and apparatus for the production of articles made of moulded plastic material by means of injection or injecto-compression, in which the volume of the moulding chamber is selectively varied in a controlled way in localized areas so as to recover possible errors of dosing of the injected plastic material and completing its compression.

Abstract: A method for the production of plates of material with overmoulded parts made of plastic material of different dimensions, of shapes and colours, by means of a first injection for the formation of the plate and a subsequent injecto-compression for overmoulding said parts on the plate. Each injection can conveniently be performed with sequentially controlled injection spots.

Abstract: Described herein is injecto-compression moulding of articles made of plastic material with two components by means of a press of the stack-mould type in which the moulding cavity of the second component is maintained in a position of partial opening during the injection and compression of the first component within the first moulding cavity. There is moreover provided a retention system, which is associated to at least one of said first and second cavities.

Abstract: Described herein is a process for the production of plates made of plastic material by means of sequential injection with the mould half-open and a subsequent step of compression obtained by closing the mould.

Abstract: Described herein is a process for the production of plates made of transparent plastic material with non-transparent overmoulded parts by means of a first direct injection and subsequent compression for the formation of the transparent plate, and a second injection for overmoulding said parts on the transparent plate, covering the indicators or witness marks of the first injection. Each injection can be in spots controlled in sequence, and the second injection can be followed by a respective step of post-compression.

Abstract: A flow component (5) for systems for injection moulding of plastic materials having a flow passage (10) with an inlet (11) and an outlet (12), which together form an elbow (13), which has an internal projection (16) facing the inlet (11) and delimiting two areas (17) of doubling of the flow located immediately downstream of a guide passage (14) for a valve stem (8).

Abstract: An injector for equipment for injection moulding of plastic materials the cylindrical body of which has a distal axial portion of larger diameter, a proximal axial portion of smaller diameter, and an intermediate adapting portion shaped like a truncated cone made of a single piece with the distal and proximal portions. An electrical heating resistor extends without any interruption within a helical groove of the body of the injector.

Abstract: A method for producing components for injection moulding comprising a body made of thermally conducting material with expansion coefficient matching that of the insulating layers and provided with a passage for the material to be injected. At least one strip of electrically conducting material with high change of resistance with temperature, forming a heating resistor or inductor is applied on a electrically insulating base layer previously directly applied on the body. At least one final insulating layer with low thermal emissivity is then applied to optimise electrical efficiency. The method utilises thermal spray techniques and can be applied also for production of other heating equipment.

Abstract: An injection nozzle for plastic injection moulding equipment having a nozzle tip (4) with an internal hollow element (5) made of a material with high thermal conductivity, and an external hollow element (6) made of a material with a lower thermal conductivity. The internal hollow element (5) is connected to the body (1) of the injector nozzle independently with respect to the external hollow element (6), and a space of mutual separation (19) is defined between the internal and external hollow elements (5, 6).

Abstract: Described herein is a process for the production of articles made of plastic material (1), in particular transparent plates, with parts made of plastic material at least in part overmoulded on the plate (1) by means of injecto-compression, excluding from the compression areas of connection (3, 4) between the overmoulded parts (2) and the plate (1).

Abstract: An injection nozzle for plastic injection moulding equipment having a nozzle tip (4) with an internal hollow element (5) made of a material with high thermal conductivity, and an external hollow element (6) made of a material with a lower thermal conductivity. The internal hollow element (5) is connected to the body (1) of the injector nozzle independently with respect to the external hollow element (6), and a space of mutual separation (19) is defined between the internal and external hollow elements (5, 6).

Abstract: An injection nozzle for plastic injection moulding equipment having a nozzle tip (4) with an internal hollow element (5) made of a material with high thermal conductivity, and an external hollow element (6) made of a material with a lower thermal conductivity. The internal hollow element (5) is connected to the body (1) of the injector nozzle independently with respect to the external hollow element (6), and a space of mutual separation (19) is defined between the internal and external hollow elements (5, 6).

Abstract: An injection nozzle for plastic injection moulding equipment having a nozzle tip (4) with an internal hollow element (5) made of a material with high thermal conductivity, and an external hollow element (6) made of a material with a lower thermal conductivity. The internal hollow element (5) is connected to the body (1) of the injector nozzle independently with respect to the external hollow element (6), and a space of mutual separation (19) is defined between the internal and external hollow elements (5, 6).