D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 11/00 (2006.01)
Patent
CA 2329806
A process for increasing bulk of a foreshortened fibrous web comprises adding moisture to at least the web's selected portions, thereby causing the crepe in the selected portions to relax and the selected portions to expand, while retaining the crepe in the rest of the web. A preferred apparatus comprises a pair of opposite surfaces, at least one of which having expansion conduits therethrough, the web being impressed between the surfaces. A temperature differential is created between the two opposite surfaces, sufficient to drive the moisture added to the selected portions therethrough, thus relaxing crepe in the selected portions which expand into the expansion conduits, while the crepe is retained in the rest of the web impressed between the two surfaces.
La présente invention concerne un procédé d'augmentation du volume d'une toile fibreuse raccourcie qui consiste à ajouter de l'humidité à des portions choisies de la toile, ce qui provoque une relaxation et une expansion du crêpage dans lesdites portions, le crêpage étant maintenu dans le reste de la toile. Un dispositif préféré comprend une paire de surfaces opposées, entre lesquelles la toile est pressée, et dont au moins une des surfaces présente des conduits d'expansion qui s'étendent à travers elle. Un différentiel de température, créé entre les deux surfaces, suffisant pour déplacer l'humidité ajoutée au travers des portions choisies, permet une relaxation du crêpage dans lesdites portions qui se développent dans les conduits d'expansion, alors que, sur le reste de la toile pressée entre les deux surfaces, le crêpage reste maintenu.
Richards Mark R.
Dimock Stratton Llp
The Procter & Gamble Company
LandOfFree
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