Cobb sizing tester is used for fast determination of the quantity of water absorbed by a paper or board in a given time. The Water absorptiveness (Cobb value) of a substance is defined as the mass of water absorbed in a specific time by a 1 sq. meter sample of paper, board or corrugated board, under standardized conditions.
Cobb Tester measures the amount of liquid penetration into a sheet of Paper, Cardboard or Corrugated Board. The Cobb sizing Tester consists of a cylindrical container clamped to a flat base with a flexible backing onto which the sample is placed. A conditioned test sample is weighed and placed into the dry cylinder. 100 cc of water is poured over the test sample. After a specified time the water is poured off and the test piece is placed with the wet side up on the standardized and dry blotting paper. Another blotting paper is placed on top of the test sample and the excess water is removed by means of the standardized roller (2 times forwards and backwards).