Valve pin cross over nozzle for stack mould

Details Valve pin cross over nozzle for stack mould Valve pin cross over nozzle for stack mould

2007-10-30

2007-10-30

Lee, Kevin (Department: 3753)

Fluid handling

Systems

Flow path with serial valves and/or closures

C137S614030, C425S562000, C425S563000, C425S564000

Reexamination Certificate

active

10578459

ABSTRACT:
According to the present invention, a cross over nozzle (10) is provided of two parts (22,24) which, when joined, define a housing (20) having a passage (30) extending therethrough, a tapered valve seat (50) extending about the passage and a value member (60) having a tapered valve head (62) disposed in the passage for engaging the valve seat. The two parts (64,66) are axially separable at an interface (68) extending through the valve seat/valve head. In order to open the valve, both valve parts are first joined and then moved together as one member in the same direction relative to the housing axially away from the valve seat. Similarly, the valve members are jointly moved into engagement with the valve seat before the cross over nozzle is separated. Accordingly, unlike the valve gate design, the valve interface between the two parts of the valve head isn't exposed to molten resin and therefore molten resin isn't trapped therebetween to cause a string upon opening.

REFERENCES:
patent: 3205911 (1965-09-01), Swick, Jr.
patent: 4299791 (1981-11-01), Aoki
patent: 5460510 (1995-10-01), Gellert
patent: 6811393 (2004-11-01), Rick
patent: 60240425 (1985-11-01), None
Bagusche G. et al.: “Heisskanaltechnik In Etagenwerkzeugen Hot Runner Technology in Multi-Daylight Moulds”, Kunststoffe, Carl Hanser Verlag. Munchen, DE, vol. 85, Nr. 6 pp. 758-760 XP000495990, ISSN: 0023-5563.

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