Procedure Cobb Sizing Tester

Effective Lab India manufactures the best Cobb tester according to industrial standards. The standard operating procedure of Effective Lab India according to the ISO standards is mentioned below.

• Pick up the sample of the corrugated box and weigh it to 0.1 grams.
• Place the cork sheet on a metal plate and after it place the specimen and clamp it firmly. The clamping is for preventing any kind of leakage between the ring and the sample.
• If you would like to ensure leak-free clamping then use a soft gasket of the same dimension as the ring.
• Now, put water into the fixture according to the sample requirement.
• Hold the sample for some time. (120 seconds for paper and 300 seconds for a corrugated box).
• If any sample shows the sign of leakage. Reject it.
• If the sheet to the rubber mat goes through any liquid, then the test will not be acceptable.
• After completion, the buzzer starts buzzing. If it’s going then pick up the sample from the tester.
• Drain out the excess water from the sample with the help of a hand roller.
• After that, weigh the sample again and your test is completed.

Formula of Cobb Test

For calculating the Cobb value use this formula.

Cobb value= Weight of the sample after testing – Weight of the sample before testing.

You can easily test the Cobb value of paper by following the above standards of Effective Lab India’s Cobb tester.