Automatic Cobb Tester


The ACT monitors water uptake continuously across a full 100 cm² area of sized paper or board as a function of time. Apart from the total amount of absorbed water over 60 seconds, this technology reveals the different dynamic components of water absorption.

From FIBRO System AB, a TMI Group of Companies brand.

Corrugated Testing, Ink and Printability Testing, Paper and Tissue Testing, Pulp and Sheet Making Testing
Adhesives and Labels, Corrugated and Board, Flexible Packaging and Films, Paper and Pulp, Tissue Paper
Other Property, Porosity

Once the operator has inserted the test specimen, the test is done automatically by the instrument as no weighing or blotting of the specimen is required. This way the regular operator time of three minutes for a 60 second Cobb test is reduced to only a few seconds for loading of the specimen.

This innovative principle offers a completely new opportunity to characterize and understand the phenomena of dynamic water absorption.


  • Continuous monitoring of the water uptake in real-time reveals the dynamic absorption as it happens
  • Suitable for sized paper and board
  • Tests a full 100 cm² large area
  • Fully automatic operation reduces operator time from several minutes to a few seconds
  • No operator training required:
    • no weighing of sample, no blotting paper used, no heavy Couching Roll

Mode of Operation

The specimen is clamped in a closed chamber against a porous membrane saturated with water. The absorbed amount of water is then continuously monitored using a precision level sensor. After a
preset time (e.g. 60 seconds), the test is automatically terminated, free water on the test surface is removed and the clamp is opened up releasing the specimen. A Cobb value is finally displayed together with the curve showing dynamic water absorption as a function of time (see reverse for chart).


Signal Interface USB, LAN 10/100, COM-port
Test cycle Time 15, 30, 60, 120, 180 seconds
Sensor Resolution 0.1 Cobb
Repeatability ±0.5 Cobb
Specimen size min. 150 x 150 mm
Water Supply clean, filtered (<8µm)
Water volume/test < 100 mL
Air Supply 8 bar (110 psi)
Power Supply 100-240 VAC, 200 W
Dimensions (HxWxD) 490 x 190 x 320 mm
Shipping Dimensions 58 x 46 x 48 cm (0.13m³)
Weight (Net/Gross) 26 / 35 kgs

Ordering Information

Catalog number: 61-76

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