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AssigneeErgotech
InventorMaurizio Dini
Estimating the term…
A system for the injection moulding of plastic material is described. The system has an injection device of the hot runner type for the injection of a plastic material, in a molten state, into a mould, a circular diaphragm to distribute evenly and circularly in a cavity of the mould, through a circular injection gate or port, the plastic material injected by the injection device, and control means adapted to control an operation of the moulding system an including a heating inductor and heating means provided to heat and keep at a hot temperature the injection device, and a thermocouple being arranged in an area of the circular injection gate. The control means are adapted to control through the heating inductor a moulding cycle of a piece. The system is particularly suitable for moulding pieces which typically have a form of a solid of rotation with cylindrical outer surfaces, and is configured in an area of the circular injection port so as to avoid a formation of waste or superfluous parts which must be subsequently removed from the piece, once moulded.
System (10) for the injection moulding of plastic material, in particular of pieces (PZ, PZ-10) exhibiting the form of a solid of revolution with external and/or internal cylindrical surfaces or the like, comprising:
System (10) for the injection moulding of plastic material according to anyone of the preceding claims, wherein said mould (11) is constituted by a fixed part (11a), in which said circular diaphragm (3) is integrated, and by a mobile part (11b), that is adapted to move (fl) relatively to said fixed part (11a) between an open position, corresponding to an open configuration of said mould (11), and a closed position, corresponding to a closed configuration of said mould (11), and wherein said circular injection gate (25) is formed in said fixed part (11a) along a separation plan (15) that separates said fixed part (11a) and said mobile part (11b) in the closed configuration of the mould (11).
System (10) for the injection moulding of plastic material according to anyone of the preceding claims, characterized in that said control means (23, 24) are adapted to control in real time, through said heating inductor (21), the temperature (T, T+, T−) of the zone of said circular diaphragm (13), during the injection phase of the plastic material (MP) into the mould (11), also by taking into account the characteristics (D-1, T1, T2, T3, T4, D-2), in particular physical and rheological (D-2, G′, G″, tan(d)), of the plastic material (MP) that is used to mould the piece (PZ, PZ-10).
System (10) for the injection moulding of plastic material according to anyone of the preceding claims, characterized in that said circular diaphragm (13) and said circular injection gate (25) are configured to avoid the execution of further works, such as removal of scrap, sprues and/or other parts of scrap from the piece, once it is moulded.
Method for the injection moulding of plastic material of pieces (PZ, PZ-10) that exhibit the form of a solid of revolution with external and/or internal cylindrical surfaces or the like, through an injection moulding assembly or system (10) comprising:
Dependencies are inferred from the claim text.