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Pinched pleat

A pleat that is closed off by excessive pressure or crowding, thus reducing the effective filtration area.

FAQ

A pleat that is closed off by excessive pressure or crowding, thus reducing the effective filtration area.

How to fold a filter paper:

  1. Fold the paper into exact quadrants
  2. Make a further two folds bringing in the outer edges into the center line
  3. Open the folded circle and invert
  4. Push the alternate folds into the center, making a neatly pleated arrangement