B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/76 (2006.01) B29C 45/17 (2006.01)
Patent
CA 2148281
It is proposed that a pressure control device and/or pressure regulating device (8) be used for a fluid medium, in particular air or gas, preferably nitrogen, which is to be supplied to an injection mold in addition to the molten plastic, this pressure control device and/or pressure regulating device (8) being provided as a stationary, but preferably as a mobile unit between a pressure generator/pressure accumulator (7) and an injection system associated with the injection mold (3), e.g., in a nozzle head or add-on building block. The deuce has a main line (21) which leads from the pressure generator/pressure accumulator (7) to the injection system (27) and which is switchabte by means ef valve control only in such a way that it either lets through or blocks the inflow of media, a first branch line (28) leading to a receiver side of a pressure sensor (29) whose other receiver side is sensitive to the pressure of the medium in the injection mold, and a second branch line (30) which can be switched so as to let through or block flow via a valve control influenced by the pressure sensor (29) and, in so doing, forms a media outflow from the injection mold, in particular a return of media to the pressure generator/pressure accumulator (7). Essential features of this device consist in that the main line (21) branches into at least two parallel flow paths (23a and 23b), that each flow path (23a and 23b) is outfitted with a media inflow control valve (24a and 24b) which may be operated to let through or block flow, as required, that the media inflow control valves (24a and 24b) have different flow cross sections (25a, 25b), and that these media inflow control valves (24a and 24b) can be controlled individually and/or jointly in a stepwise manner depending on the pressure difference deternuned by the pressure sensor (29).
Eckardt Helmut
Ehritt Jurgen
Holzschuh Johann
Renger Michael
Schwesinger Rolf
Adcuram Maschinenbauholding Gmbh
Battenfeld Gmbh
Fetherstonhaugh & Co.
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