For testing the average Smoothness, Porosity and Softness of paper and films by determining the time necessary for a certain volume of air to flow through the inserted sample, under a uniform pressure.

According to: TAPPI T 460 M 49, TAPPI T 490 SM 58

Effective area of Porosity:      645.16 mm2

Contact area of smoothness   645.16 mm2

Contact Pressure of smoothness   0.21 Kg/cm2

Softness contact area              645.16 mm2

Steel Plug - Height approx.       5/100 mm

                                             (100cc of air flows out in 10 sec.)

PRESSURE

- Soft Paper (e.g. news paper)        21.09 Kg/cm2

- Hard Paper                                   91.24 kg/cm2

SMOOTHNESS TEST

Lateral flow between several sheets

POROSITY TEST

Rate of flow through one square inch

SOFTNESS TEST

Rate of flow over the surface, which has been constructed by a given weight. Uniform clamping pressure is provided by a lever arm, to which weight can be attached.