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:
Described herein is injection-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:
Nozzle for injection moulding of plastic materials, comprising a generally cylindrical body with spiral-shaped groove on the external surface, in which a first and a second heating resistor which are independent from each other and which are equipped with respective autonomous controlling thermocouples, are wound.
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:
Described herein is a process and apparatus for the production of an article made of moulded plastic material with a first component and at least one second component overmoulded on the first component, in which, in the second injection step for overmoulding the second component, the moulding cavity is at least in part delimited by at least one resting surface that is independent of and mobile with respect to the mobile surface of mould and is set in contact with the first component.
Abstract:
A method for the production of plates of material with overmoulded parts made of plastic material of different dimensions, of shapes and colors, by means of a first injection for the formation of the plate and a subsequent injection compression for overmoulding said parts on the plate. Each injection can conveniently be performed with sequentially controlled injection spots.
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 and apparatus for the production of an article made of moulded plastic material including a first component formed in a first step of injection and possible compression, and at least one second component overmoulded on said first component in a second step of injection and possible compression step. The two steps of injection and possible compression are carried out within the same moulding cavity defined between a mould and a countermould in a single station, without any need for displacing the countermould into a second station.