The weather fluctuations affect the testing of cellulose products

Cause

Hysteresis is an effect that manifests itself in several areas, including how a fiber, and thus a paper, behaves when the ambient humidity changes. If you come from a high relative humidity (RH) down to 50% RH, you do not get the same value for the absolute moisture content as if you come to 50% RH from a lower relative humidity. Therefore, the paper samples that have been exposed to a high RH value are dried to below 35% RH in a special climate room according to standard before conditioning to 50% RH in the paper lab for subsequent paper testing. In this way, the results become reproducible and can be compared with previous measurements.

Of course, we can also determine the hysteresis effect, and thus expected properties under different air conditions, for a particular paper or paperboard sample. Depending on the history and composition of a paper, properties may vary and make it more or less suitable for different applications.

Method

In adapted rooms, experiments can be performed and investigations of the effect of moisture on different paper properties. Environments are simulated, for example, temperature and humidity conditions at printers, converters and offices to see how the properties of current samples of paper and board behave. Simulation of a paper product's transport through different climates is also possible.

Deliveries

Report