Process and apparatus for the preparation of electret filaments,

Details Process and apparatus for the preparation of electret filaments, Process and apparatus for the preparation of electret filaments,

1982-09-17

1984-12-04

Czaja, Donald

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 22, 264 26, 4251748E, B29C 900

Patent

active

044863659

ABSTRACT:
A method for the production of electret filaments or fibers from high molecular weight substances is described which consists of melting the substances and extruding them through die orifices, electrically charging, polarizing and cooling the formed filaments or fibers and the electrically charging and polarization is carried out immediately prior to the issuance or during the issuance from the die orifices while the substances are in a molten state. The device for electric charging and polarizing consists either of an electrode (2) provided with one point or several points (1) which except for the point or points (1) is coated with or surrounded by an electrically insulating material, one point (1) inside the die (3) being disposed directly in front or protruding into a die orifice (4) or of an electrode (9) provided with one point or several points (8) completely coated with or surrounded by an electrically insulating material, one point (8) inside the die (3) being disposed directly in front or protruding into a die orifice (4), and of a counterelectrode (10) which is not coated with or surrounded by an electrically insulating material and which is inside the die (3) but not disposed directly in front of or protruding into the die orifices (4).

REFERENCES:
patent: 2338570 (1944-01-01), Childs
patent: 2810426 (1957-10-01), Till et al.
patent: 4215682 (1980-08-01), Kubik et al.
patent: 4230650 (1980-10-01), Guirgnard
patent: 4266918 (1981-05-01), Manley
patent: 4316716 (1982-02-01), Liu

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