Non-woven fiber sheet and process and apparatus for its producti

Details Non-woven fiber sheet and process and apparatus for its producti Non-woven fiber sheet and process and apparatus for its producti

1990-07-19

1991-09-24

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

264 22, 55155, H05F 300

Patent

active

050511599

ABSTRACT:
A process apparatus for producing a non-woven, especially a non-woven electret, fiber sheet provides for directing the non-woven fibers at a collecting surface and into an electric field between at least one electrode and the collecting surface.
This process, in which the fibers are collected in the electric field, enables the economical production of a non-woven electret fiber sheet of single layer structure having large amount of polarized charges (giving a total electric charge per unit area of at least 7.times.10.sup.-11 Coulomb/cm.sup.2), and a weight of at least 60 g/m.sup.2, preferably greater than 80 g/cm.sup.2.
The non-woven electret sheet may have the large amount of electret charge throughout its thickness and/or a uniform weight distribution and thus have excellent dust collecting properties.

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patent: 4323525 (1982-04-01), Bornat
patent: 4592815 (1986-06-01), Nakao
patent: 4666395 (1987-05-01), Shah

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