For determining the water absorbency of paper, paperboard and similar material. The water absorbency of paper (the Cobb value) is defined as the quantity of water absorbed in a given time by one side of a unit area of paper or board placed horizontally under a head of one centimetre of water
Convenient spring loaded sample clamping system presses the cylinder against the sample on the rubber mat so that a leak proof seal is obtained. The clamping force is adjustable. The cylinder lifts when 2 handle bars are pinched together
Easy and safe clamping mechanism. The clamping system presses the cylinder against the sample on the rubber mat so that a leak proof seal is obtained and can be tilted with a knob to contact with water.
The container mounted on a stand and filled with the specified quantity of water, The Pre-weighted sample clamps and get in contact with water, After the test time has elapsed, it is turned back and this surplus water is removed by pressing the test piece between standard blotter under a steel roller supplied along with equipment. The weight increase with the exposure of water is called cobb value
It also gives indications of the additive substances applied during process that improve printing quality and resistance to liquids.
Test area: 100 cm
Level indication: Indication for 100 ml on the inside of the cylinder
Couch roll: Stainless Steel roller having a smooth surface Width 210 mm (8”) Diameter 88 mm (3.6”) Weight 10 Kg. +- 0.5 Kg.
Stop watch, Graduated cylinder 100 ml
Digital weighing Balance .001 gram
Standard blotter GSM 200 and capillary 60 mm
APPLICABLE REFERENCE STANDARD