Board paper COBB testser

Board paper COBB testser is for the measurement of surface water absorption of paper and paper board.

Board paper COBB testser Principle

The Cobb value of surface water absorption of paper and paperboard.: 

The calculated mass of water absorbed in a specified time by a unit area of paper or board under specified pressure and temperature conditions. It is expressed in g/㎡.

C=（G2-G1）×100。

C-water absorptiveness

G2-wet mass, in grams, of the test piece

G1-dry mass, in grams, of the test piece

When Cobb value is less than 200～250 g/㎡ for single layer, more layers can used.

Board paper COBB testser Technical Data

metal roller sectional area: 100±0.2㎝2

metal roller diameter: 112.8±0.2mm

Roll height：50mm

Blotting paper: 200～250g/㎡

Absorption speed: 75mm/10min

Smooth metal roller: length 200±0.5mm，mass10±0.5kg。

Water volume: 100mm±5ml。

Dimension: 480×400×420（mm）

Weight: 28kg

Standard

ISO 535，GB/T 1540，QB/T 1668