Search
Use the search bar or filters below to find any TAPPI product or publication.
Filters
Content Type
Publications
Level of Knowledge
Collections
Magazine articles
Activating the â??Action Learning Processâ?? at your mill, Solutions!, November 2002, Vol. 85(11) (121KB)
Activating the ‘Action Learning Process’ at your mill, Solutions!, November 2002, Vol. 85(11) (121KB)
Magazine articles
Tissue industry adjusts to new markets, embraces new technology, Solutions!, October 2002, Vol. 85(10) (192KB)
Tissue industry adjusts to new markets, embraces new technology, Solutions!, October 2002, Vol. 85(10) (192KB)
Magazine articles
Breakthrough technology in papermaking, Solutions!, October 2002, Vol. 85(10) (324KB)
Breakthrough technology in papermaking, Solutions!, October 2002, Vol. 85(10) (324KB)
Magazine articles
Tom Woodward, Solutions!, September 2002, Vol. 85(9) (534KB)
Tom Woodward, Solutions!, September 2002, Vol. 85(9) (534KB)
Magazine articles
Aracruz launches â??fiberline Câ?, Solutions!, September 2002, Vol. 85(9) (460KB)
Aracruz launches “fiberline C”, Solutions!, September 2002, Vol. 85(9) (460KB)
Magazine articles
Automatic board handling & packagingâ??closeups on Stora Enso Ingerois, Solutions!, September 2002, Vol. 85(9) (299KB)
Automatic board handling & packaging—closeups on Stora Enso Ingerois, Solutions!, September 2002, Vol. 85(9) (299KB)
Journal articles
Magazine articles
The PPI Top 100, Paper360º September/October 2017
The PPI Top 100, Paper360º September/October 2017
Journal articles
Magazine articles
TAPPI JOURNAL Summaries, Paper360º September/October 2017
TAPPI JOURNAL Summaries, Paper360º September/October 2017
Journal articles
Magazine articles
TAPPI Journal Summaries, Paper360º January/February 2020
TAPPI Journal Summaries, Paper360º January/February 2020
Journal articles
Magazine articles
Viscoelastic web curl due to storage in wound rolls, TAPPI Journal July 2020
ABSTRACT: Winding is often the final operation in a roll-to-roll manufacturing process. Web materials, i.e., materials that are thin compared to their length, are wound into rolls because this form is the only practical means to store them. The resulting bending strains and associated stresses are large for thick webs and laminates. As many webs are viscoelastic on some time scale, bending stresses lead to creep and inhomogeneous changes in length. When the web material is unwound and cut into discrete samples, a residual curvature remains. This curvature, called curl, is the inability for the web to lie flat at no tension. Curl is an undesirable web defect that causes loss of productivity in a subsequent web process. This paper describes the development and implementation of modeling and experimental tools to explore and mitigate curl in homogenous webs. Two theoretical and numerical methods that allow the prediction of curl in a web are developed: a winding software based on bending recovery theory, and the implementation of dynamic simula-tions of winding. One experimental method is developed that directly measures the curl online by taking advantage of the anticlastic bending resulting from the curl. These methods are demonstrated for a low-density polyethylene web.