Materials: Hygrothermal expansion
By Dr. David R. Roisum
Expansion is a fact of physics that has many effects. Machines that are a meter or more wide may need special designs and assembly methods for rollers and other cross-machine components.
Webs that are more than a meter or more wide may be at risk of wrinkling due to increases in temperature or humidity.
Product and process design may require us to consider or reconsider the temperatures and, in some cases, moistures seen by your web product during its entire life cycle of manufacturing, converting, storage, transportation and end-use by your customer.