Paper machine for the manufacture of high bulk soft crepe paper

Details Paper machine for the manufacture of high bulk soft crepe paper Paper machine for the manufacture of high bulk soft crepe paper

D - Textiles, Paper

21

F

D21F 9/00 (2006.01) D21F 11/00 (2006.01)

Patent

CA 2078877

A paper machine for the manufacture of a soft crepe paper grade, which in respect of bulk and softness is fully comparable to the one manufactured in a paper machine made for through-air drying by hot air, is in principle a conventional soft crepe paper machine, in which a conveying and imprinting fabric (25) is substituted foe the pick-up felt. A pick-up device (23) operating with air flow picks up the web (15) from the forming fabric (9) and transfers it to the imprinting fabric (25) without any appreciable compaction of the web (15). The imprinting fabric (25) is maintained clean and dry by cleaning devices (41, 43, 45) and a device (47) for depleting the imprinting fabric (25) of water before it arrives at the pick-up device (23). Further, sir current generating devices (35, 37, 39) are provided Cor removing water from the paper web (15) by passing air of ambient temperature through the web (15). These have a capacity that is sufficient for raising the dry solids content of the web to at least 25 % before the web arrives at the Yankee dryer (29). If desired, the paper machine may easily and in a short time be converted into a conventional soft crepe paper machine, essentially by substituting a pink-up felt for the imprinting fabric (25).

Machine à papier destinée à la fabrication d'un papier crêpé tendre qui, sur le plan de la douceur et du bouffant, peut tout à fait se comparer à celui qui est fabriqué dans une machine à papier comportant un système de séchage à l'air chaud; le principe en est celui d'une machine à papier crêpé tendre traditionnelle, dans laquelle une étoffe d'impression et de transport (25) remplace le feutre leveur. Un dispositif leveur (23) fonctionnant par flux d'air, retire la bande (15) de l'étoffe de façonnage (9) et la transmet à l'étoffe d'impression (25) sans la comprimer excessivement. Des dispositifs de nettoyage (41, 43, 45) ainsi qu'un dispositif (47) servant à drainer l'eau de la structure d'impression (25) avant qu'elle n'atteigne le dispositif leveur (23), maintiennent celle-ci en condition propre et sèche. De plus, des dispositifs générant un courant d'air (35, 37, 39) sont conçus pour enlever l'eau du rouleau de papier (15) en faisant circuler de l'air à température ambiante au travers de celui-ci. Ces dispositifs possèdent une capacité suffisante pour élever la teneur du rouleau en solides secs à au moins 25 % avant que celui-ci n'atteigne le sécheur frictionneur (29). Si on le souhaite, on peut transformer la machine à papier en machine traditionnelle de fabrication de papier crêpé, facilement et rapidement, en remplaçant l'étoffe d'impression (25) par un feutre leveur.

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