Electret filter element and method for producing thereof

An electret and filter material technology, applied in separation methods, methods for reacting gaseous media with gaseous media, chemical instruments and methods, etc., can solve problems such as large equipment costs and increase costs, and achieve energy saving and strong charging. Effect

Active Publication Date: 2011-08-17
CARL FREUDENBERG KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This results in large equipment outlays and a significant increase in costs

Method used

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  • Electret filter element and method for producing thereof
  • Electret filter element and method for producing thereof
  • Electret filter element and method for producing thereof

Examples

Experimental program
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Embodiment Construction

[0045] figure 1 A spray device 1 configured as a nozzle is shown in side view. A conical spray 3 is sprayed from the tip 2 of the spray device 1 , and the spray 3 is composed of individual droplets 4 . Droplet 4 is in a charged state. Charging is effected by an electric field formed between the disintegrated droplet 4 a and a ring electrode 5 .

[0046] In the spray 3, 60% or more of the charged droplets 4 held therein have charges of the same polarity. In the spray 3, the charge polarity of the droplets 4 held therein is independent of the droplet size.

[0047] figure 2 Expressed in partial detail view (circular view) figure 1 The tip 2 of the spraying device 1 from which the droplets 4 are ejected and broken up. The droplet 4 is charged by an electric field (arrows represent its field lines) before it disintegrates, the charge being defined as negative in this schematic diagram.

[0048] image 3 A spray device 1 is shown schematically, from which a tip 2 emits a s...

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Abstract

A method for producing an electret filter element according to one of the preceding claims, comprising the steps of: providing fibers (6), providing a spraying device (1) for a fluid, producing a spray cloud (3) of electrically charged fluid droplets (4), guiding the fibers (6) through the spray cloud (3), wetting the fibers (6) with the fluid droplets (4) and depositing the fibers (6) to form a fiber layer (8), is characterized, with regard to the problem of creating a filter element which has a homogeneous charge distribution and a high filter efficiency while being cost-effective to produce, in that the fluid droplets (4) are electrically charged by an electrical field between breakaway fluid droplets (4a) and a counter electrode (5). An electret filter element is produced according to the method.

Description

technical field [0001] The present invention relates to a method for manufacturing an electret filter material, the method comprising the steps of: providing fibers; providing an ejection device for a fluid; generating Spraying; directing fibers through the spray; wetting fibers with droplets and depositing fibers to form a fiber layer. Furthermore, the invention also relates to an electret filter material comprising at least one fiber layer having charged fibers. Background technique [0002] It is known that EP 1417176A1 provides a method in which fibers are guided through a spray of liquid droplets. The size of the droplets is less than 20 μm. In this method, the droplet is charged by splitting using the Lenard effect ("Lenard-Charging-Effect"). The charged droplets are guided through an electric field along with the fibers. In this method, droplets with different polarities are generated in a statistical distribution. The droplets produced here are both positively a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16D04H1/42D06M11/05D06M11/13D06M11/76D04H3/02
CPCD06M2200/00D06M23/06B01D2239/0435D06M11/76B01D39/1623D04H3/02B01D2239/10D06M11/05D06M11/13Y10S55/05Y10S264/48B01D39/16D04H1/42
Inventor K·韦瑟M·克劳斯T-H·江J·扎博尔德
Owner CARL FREUDENBERG KG
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