Pretreatment for Baghouse Filters

In today’s post we will be breaking down different fabric treatments for baghouse filters and how these pretreatment processes effect your filter medium.

  • Calendering: High pressure pressing of the fabric by rollers to flatten or smooth the material.
  • Napping: This is the scraping of the filter surface across metal points or burrs on a revolving cylinder.
  • Singeing: This is done by passing the filter material over an open flame, removing any straggly surface fibers.
  • Glazing: High pressure pressing of the fiber at elevated temperatures.  The fibers are fused to the body of the filter medium.
  • Coating: Involves immersing the filter material in natural or synthetic resin such as polyvinyl chloride, cellulose acetate, or urea-phenol.

Some of the results and reasons to use these pretreatments are:

  • Calendering: Result is that it flattens, smooths or decorated the filter medium.  This can increase surface life, dimensional stability, and provides a more uniform fabric surface.
  • Napping: The result is that it raises surface fibers, which can provide extra areas for interception and diffusion.
  • Singeing: Removes straggly fibers and provides a uniform surface area.
  • Glazing: Fibers are fused to the filter medium as a result.  This improves mechanical stability.
  • Coating: This helps to lubricate woven fibers.  Coating helps provide high temperature durability as well as chemical resistance for various fabric material.
Related Resources:

Filter Bag Construction

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