Active substance and device for the deacidification of...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 25/18 (2006.01) B41M 7/00 (2006.01) C01D 7/00 (2006.01) D21H 17/66 (2006.01) C08K 3/26 (2006.01) C08K 5/00 (2006.01)

Patent

CA 2327786

Modern techniques for manufacturing paper using mechanical wood pulp has lead to a persistent over-acidification of printed manner, and threatens to permanently destroy the same. This over-acidification can be neutralized by using an alkaline active substance whose main component is a salt having a relatively low water affinity. An alkaline deposit can be deposited on the paper by also using said alkaline active substance. A device suited for deacidification using this active substance comprises a case (10) which can be closed. Printed matter which can be fanned out in a stand (1) is treated in said case. The printed matter is treated by introducing the powdered active substance via a screw conveyor (32) into an air stream circulated by a fan (19a), whereby the printed matter is leafed through in order to expose it to the active substance.

Les techniques modernes de production du papier au moyen de pâte mécanique ont entraîné une hyperacidification des documents et risquent de les détruire de manière irrévocable. Une substance active alcaline, dont le constituant principal est un sel présentant une affinité relativement faible avec l'eau, permet de neutraliser cette hyperacidification, et il est même possible de réaliser un dépôt alcalin sur le papier. Un dispositif approprié pour la désacidification au moyen de cette substance active présente un boîtier (10) pouvant être fermé, dans lequel est traité un document pouvant être ouvert en éventail dans un support (1). A cet effet, on introduit la substance active en poudre dans un courant d'air soufflé par un ventilateur (19a), par l'intermédiaire d'un convoyeur à vis (32), et on fait défiler les feuilles du document pour exposer ce dernier à la substance active.

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