Presto's Cobb Test for Corrugated Board is used for quick assessment of the quantity of water absorbed by a corrugated board, paperboard or paper in a given period of time. The water absorptiveness or Cobb value of a substance is defined as the mass of water which is absorbed in a specified period of time by a paper sample, board sample of 1 square meter under the highly standardized conditions. Cobb tester means the amount of liquid penetration into a sheet of paper, corrugated board or paperboard.
The instrument comprises of a cylindrical container which is clamped to a flat base with a flexible and removable base through which the sample is placed. The conditioned test specimen is weighed and then placed inside the cylindrical vessel on the dry surface. After that 100 cc of water is poured over the sample. After a given period of time water is poured off and the test piece is taken out from the cylindrical vessel and placed on the dry bottling paper with the wet side up. Another bottling paper is taken out to put it on the top of the wet sample, and excessive water is drained out by pressing it with the roller, two times in forward direction and 2 times in backward direction. Presto’s Cobb Tester for Corrugated board provided highly accurate results.
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