Experimental characteristics of forming fabrics and fibre mats

This paper describes an experimental method for the estimation of the scree n coefficient and the mat resistance. Design of experimental setup and rest methods are explained in detail. Three distinct regions of pressure drop t hrough the mat are defined as a function of basis basis weight and the char acteristics of each region are studied. For low basis weight mats, the vali dity of Darcy's law is questioned. Guidelines for excluding screen effect a re investigated. Also, formation analyses of paper samples made from the cu rrent experiment are presented in comparison with handmade and machine-made sheets.