Ruag Munition

Christian Herren

Martin Monkewitz

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 ( ) which can be closed. Printed matter which can be fanned out in a stand ( ) is treated in said case. The printed matter is treated by introducing the powdered active substance via a screw conveyor ( ) into an air stream circulated by a fan ( ), whereby the printed matter is leafed through in order to expose it to the active substance.

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Rosshausern, Switzerland

Christian Herren