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

Leave a Reply

Your email address will not be published. Required fields are marked *

Hassle-Free Online Product Catalog

Want to take the inconvenience out of purchasing new filters? Browse our online product catalog, order, and sit back while we take care of your dust collection needs!