Cobb Sizing Tester CT-50
The Cobb testing equipment allows to measure the amount of liquid that penetrates a sheet of
paper and cardboard. The definition of the Cobb value for a degree of gluing is the calculation of the weight of water absorbed in a specified time per 1 m2 of paper or cardboard under standard conditions (ISO 535).
The Cobb Sizing Tester consists of a cylindrical container clamped to a metal base covered with a sheet of flexible material, to make a hermetic seal, once the sample has been placed between the base of the cylindrical container and the flexible sheet of the base plate, A conditioned sample is pre-weighed on a balance, with an accuracy of 1 mg, and then placed inside the Cobb equipment when it is dry. Once the sample is in place, 100 ml ± 5 ml of distilled water are poured into the cylindrical container, simultaneously taking the time on a stopwatch. For example, if a time period of 60 s has been selected, the water should be evacuated after 45 seconds.
• Quick clamping of the sample (spring loaded)
• Test area of the standard sample 100 cm2
• 10 Kg stainless steel roller
• Soft rubber sealing gasket
• Made of stainless steel
> COBB Tester with a quick clamping grip, on a metal base covered with a rubber sheet.
> 200 mm polished metal roller. length, a diameter of 90 mm and a weight of 10 ± 0.5 Kg
> Non-absorbent soft rubber ring to avoid lateral water seepage.
In addition to this equipment, a complete Cobb Tester is also needed: blotting sheets of paper
with a basis weight of 200-250 gr./m2, an analytical balance with a sensitivity of 0.001 g, a
stopwatch and a graduated glass cylinder.
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