Cobb60 Water Absorption

Standard Testing

Standard test protocol requires pouring one hundred millilitres of distilled water onto a defined sheet area held within a rigid metal ring. A metal roller passes over the test specimen between sheets of standard absorbent blotting paper to remove excess surface water after sixty seconds of contact time. The difference in specimen mass before and after liquid exposure yields the absorbed mass value in grams per square metre.

Incorrect roller pressure or improper blotting timing distorts liquid absorption values and invalidates comparative quality checks. Evaluating Cobb60 water absorption allows packaging converters to predict substrate behavior when exposed to high humidity or wet filling environments.

Barrier Performance

Moisture penetration reduces structural stiffness and compromises carton stacking strength in cold storage environments. Outer linerboard surfaces require low absorption values to maintain structural integrity and prevent water-based ink bleeding during flexographic printing. Corrugated box performance degrades rapidly when water absorption values exceed contract limits.