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Hygroexpansion

Moisture-induced dimensional changes have a significant effect on the runnability of paper and paperboard in converting operations. This phenomenon of hygroexpansion is also largely responsible for web and reel defects such as curl, twist, cockling, waviness and long edges of the paper material.

 

Cause

The hygroexpansion of the paper is a major concern for any producer of paper, print or packaging. For a long time, however, no method has been available for measuring the hygroexpansion in a flexible, effective and accurate manner.

Benefit

The method can predict dimensional changes of paper when the moisture change, e.g. during printing or end-use.

Method

RISE has developed new test equipment to measure the hygroexpansion of paper materials. This equipment is both labour-effective and time-effective, since it is fully automatic and allows 30 independent hygroexpansion tests to be run at the same time. The equipment is connected to a moisture generator which can be programmed to make measurements possible under optional humidity histories in the interval 10 %RH to 90 %RH

Deliveries

We can provide hygroexpansion coefficients, and also a description of how dimensional changes occurs.

Ordering

Send an e-mail or call any of the contact persons.

Facts

Service

Hygroexpansion of paper and paperboard

Type

Not applicable

Product area

Not applicable

Instrument

Humidity/air speed

Metrology Area

Humidity/Air velocity

Certifications

Not applicable

Innovation area

Bioeconomy

Price

Price on tender

Preparations

No preparation needed

Mikael Nygårds

Contact person

Mikael Nygårds

Gruppchef

+46 10 228 45 43
mikael.nygards@ri.se

Read more about Mikael