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Filter bag, pleatable filtration material therefore, and process of making same

A filter material and filter bag technology, applied in the field of filtration, can solve problems such as non-pleating

Active Publication Date: 2011-09-21
SEFAR BDH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, even with this process described, some filter materials cannot be pleated by known methods and are therefore considered non-pleatable

Method used

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  • Filter bag, pleatable filtration material therefore, and process of making same
  • Filter bag, pleatable filtration material therefore, and process of making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] PTFE fibers were hydroentangled at 400 g / m 2 stainless steel mesh. Overall density after entanglement is 800 g / m 2 . The material in this step has a permeability of about 200 l / dm 2 / min. The resulting felt support material was sprayed with a suspension of FEP particles, dried at a temperature of 150°C and added with approximately 25 g / m of FEP particles. The film was then laminated on felt while the temperature of the FEP pellets was raised to 270°C. The resulting filter material has 825 g / m 2 density, and a permeability of 15-30 l / dm2 / min at 12 mm water gauge, and is pleatable at room temperature.

Embodiment 2

[0031] Titanium dioxide particles with a particle size of less than 10 microns are mixed with the PTFE dispersion. Titanium dioxide may correspond to 1-90% by volume, preferably 25-85% by volume, the paste is extruded and calendered to form ribbons which are split along the length, expanded, and processed with rotating pinwheels . These fibers with catalyst on the surface were hydroentangled onto stainless steel 316 mesh by hydroentangling. Total density reaches 900 g / m after entanglement 2 . The E-PTFE membrane was directly laminated onto the surface of the catalyst felt, and the fibers were used as the bonding agent. The resulting material has a 900 g / m 2 Density, 15~30 l / dm2 / min permeability at 12 mm water gauge, and pleatable at room temperature.

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Abstract

The pleated filter bag, which can be used in a bag-house type dust collector, is elongated and has a longitudinal hollow center with an open end, and a pleated filter wall circumscribing the hollow center. The pleated filter wall has a felt such as PTFE fibers felted onto an apertured and pleatable scrim which can be made of metal, and having a permeability lower than a permeability of the scrim. A membrane of lower-permeability material, such as an E-PTFE membrane, covers the support felt on the outer side of the bag.

Description

technical field [0001] The present invention relates to a pleatable material or fabric for filtration, especially such as for pleated "filter bags" in baghouses. Background technique [0002] Dust collectors are used in industrial fumes to remove particulate matter. Dust collectors typically have hundreds to thousands of cylindrical elements called bags. These bags are made of porous filter fabric. These porous filter fabrics collect particulate matter as air flows through it. After several minutes of operation, particles can cake on the surface and the bags are usually cleaned with a reverse jet. [0003] An important parameter of filter fabrics is filter efficiency. The filter efficiency of the bag is related to the total surface area. In general, if the surface area is increased, the rate of gas and particulate matter passing through the fabric will decrease, thus reducing the likelihood of unwanted particulate matter passing through the fabric and reducing particle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16B01J20/08D04H1/46B01D29/11
CPCB01D61/147B01D2239/0407B01D39/1692D04H1/492B32B15/14B01D39/1623B32B27/02B01D71/36B32B5/02D04H1/559B01D2239/065D04H1/64D04H13/006B01D63/00D04H1/4326B32B5/30B32B15/18B32B15/20B32B27/12B32B27/322B32B2255/02B32B2255/26B32B2262/0253B32B2264/0257B32B2264/102B32B2307/306B32B2307/714B32B2307/718B32B2307/72B32B2509/00B01D29/11B01D39/14B01D39/16B01D39/1607B01D43/00B01J20/08D04H1/46
Inventor 卢卡·帕伦特西尔万·维厄耶
Owner SEFAR BDH
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