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Tensile Creep of Paperboard—Effect of Humidity Change Rates

Published online by Cambridge University Press:  16 February 2011

Dennis E. Gunderson  and
Wayland E. Tobey
Dennis E. Gunderson
Affiliation:
USDA Forest Service, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI 53705–2398
Wayland E. Tobey
Affiliation:
USDA Forest Service, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI 53705–2398
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Abstract

Experimental results now available are not adequate to define the mechanism of cyclic creep response of paperboard or to test plausible hypotheses. The present study examines the effect of rate-of-change of humidity on tensile creep response while monitoring the quantities of water adsorbed and desorbed by the specimen. Relative humidity is cycled between 30 and 90 percent relative humidity. Rate of humidity change in each cycle is held constant at values from 0.01 to 6 percent relative humidity per minute. Moisture sorbed by the web in each cycle is resolved to an accuracy better than ±0.05 percent moisture content. Results suggest that cyclic creep response is independent of the rate at which humidity changes. The results appear to reject the hypothesis that cyclic creep behavior is the result of a progressive increase in equilibrium moisture content.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 197: Symposium U – Materials Interactions Relevant to the Pulp, Paper and Wood Industries , 1990 , 213
Copyright
Copyright © Materials Research Society 1990

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References

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