Fluid sprinkling – spraying – and diffusing – Flow deflecting or rotation controlling means – Unitary deflector with multiple fingers or serrated edges
Reexamination Certificate
1999-09-02
2001-05-15
Kashnikow, Andres (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Flow deflecting or rotation controlling means
Unitary deflector with multiple fingers or serrated edges
C239S424500, C366S167100
Reexamination Certificate
active
06230990
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention concerns an injector for feeding additives into a polymer melt stream.
2. Summary of the Related Art
Devices for feeding one liquid medium into another are known. U.S. Pat. No. 5,176,448 describes a device for mixing fluid media in which a liquid additive is conveyed through a channel having a 90° deflection to an outlet at the side. The side outlet opens directly into the middle of the countercurrent main stream of another liquid medium directly upstream of a biscuit located inside of the main stream conduit and forming an annular gap with it for the passage of the liquids.
U.S. Pat. No. 4,753,535 describes a device for mixing two liquid media, whereby most of the main stream of the one liquid medium is conveyed through a flow channel containing static mixing elements and arranged at the center of the main stream conduit. At a right angle to the direction of flow, the second liquid medium is fed directly into the flow channel through a lateral feed port.
E. Henglein, Lexikon Chemische Technik [Lexicon of Chemical Technology], 1988, page 267, describes an injector for continuous mixing of two gases, where one component of the mixture is fed centrally into a mixing zone at a high rate while the second gas stream enters the zone through the remaining annular gap. Due to the high flow rate and the difference in flow rates at the point of entry, there is a great deal of turbulence prevailing in the mixing zone.
European Patent Application No. 838,259 describes a device for adding additives to a stream of a highly viscous liquid having one feed element for each additive to be supplied. Each feed element has a feed channel for the additive running across the direction of flow that opens into a feed port of an annular tube sheet within the main stream conduit. The tube sheet serves as additive distributor.
SUMMARY OF THE INVENTION
The present invention comprises an injector for feeding of additives primarily into the center of a polymer melt stream and subsequent feeding of the polymer melt stream and additives into a static mixer where the additives and polymer melt are blended. Preferably, it is possible to mount the injector in the polymer melt stream relatively easily.
REFERENCES:
patent: 3866886 (1975-02-01), Thorne et al.
patent: 4114195 (1978-09-01), Dirksing et al.
patent: 4753535 (1988-06-01), King
patent: 5176448 (1993-01-01), King et al.
patent: 5683632 (1997-11-01), Shimizu et al.
patent: 92 225 (1972-09-01), None
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patent: WO 94/00226 (1994-01-01), None
Henglein,Lexicon Chemische Technik, VCH (Germany) 1988, with English translation of definition of “Injektor” on p. 267.
Hwu Davis
Kashnikow Andres
Lurgi Zimmer Aktiengesellschaft
McDonnell & Boehnen Hulbert & Berghoff
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