CFM is measured using the Standard Frazier Permeability tester, It is a measure of the volume of air (cubic feet) that will pass through a standard unit area of a fabric when under a pressure differential of 1/2 water gauge.

CFM is a term that was heavily used when single-layer woven synthetic fabrics were the main filtration media. It gave the papermaker a good indication of the drainage potential of the woven synthetic fabric For the simple single-layer construction. It was also a good quality control tool for the fabric manufacturer. However, double and triple layer woven synthetic fabric constructions have a center and bottom layer, which can have a considerable influence on CFM but not necessarily on drainage rate.

CFM is still used by the manufacturer as a quality control tool for all polyester mesh design but papermakers are starting to realize that it is not always a good indicator of the drainage potential of a mesh. 

When CFM is specified, it should always be qualified at what differential pressure the measurement was taken as this will directly affect the final number. 

Anna
Sales Department
Hebei Defeng Polyester Fiber Co., Ltd
Add: Jingjiu Railway west, wugong town, Raoyang County
TEL: 86-311-67699480
FAX: 86-311-67699480
Website: www.china-polyestermesh.com. 
E-mail:anna@china-polyestermesh.com

Tag: woven synthetic fabrics, polyester mesh