Electrostatic field enhancing process and apparatus for improved

Details Electrostatic field enhancing process and apparatus for improved Electrostatic field enhancing process and apparatus for improved

1992-07-31

1994-03-22

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264205, 26421114, 425 722, 4251748E, 425224, B29C 4700, B29C 7104

Patent

active

052961729

ABSTRACT:
Process and apparatus for improving web pinning and uniformity in a fibrous web forming operation. The improvements are achieved by imposing an auxiliary electrostatic field above the fibrous web as it is pinned along a moving collection surface. An auxiliary electrostatic field enhancing plate is positioned above the web and collection surface and downstream of the laydown position where the web initially is deposited on the collection surface. The plate enhances the electrostatic field in the region above the collection surface and thereby increases the web pinning forces. When the invention is applied to a flash-spinning process where trifluorochloromethane is used as the fluid medium, an auxiliary electrostatic field of between about 2 and 80 kV/cm, preferably between about 10 and 60 kV/cm, is applied by the plate.

REFERENCES:
patent: 3169899 (1965-02-01), Steuber
patent: 3319309 (1967-05-01), Owens
patent: 3578739 (1971-05-01), George
patent: 3689608 (1972-09-01), Hollberg et al.
patent: 3851023 (1974-11-01), Brethaurer et al.
patent: 3860369 (1975-01-01), Brethaurer et al.

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