Process and apparatus for deacidifying books

To neutralize the acid in books, a processing chamber (1) takes the books half-opened on their spines to give free-projecting pages (6) in a fan. The pages are initially flushed with a water droplets/air mixture (11) in an underpressure, and then blown with a mixture (12) of air and an active substa...

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Bibliographische Detailangaben
Hauptverfasser:	LEISCH, NORBERT, KRATZERT, ARMIN, ZITZMANN, PETER
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	IMPREGNATING OR COATING OF PAPER PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:	To neutralize the acid in books, a processing chamber (1) takes the books half-opened on their spines to give free-projecting pages (6) in a fan. The pages are initially flushed with a water droplets/air mixture (11) in an underpressure, and then blown with a mixture (12) of air and an active substance in an overpressure. The water droplet/air mixture is heated to a maximum of 50 degrees C and preferably a maximum of 40 degrees C. The overpressure in the chamber, during blowing, is at least 1500 mbar and preferably at least 2000 mbar. The books are passed to a chamber (14) to dwell in a controlled atmosphere to cure the active substances. On removal, the pages have a pH value of ≤ 7.5. The active substance is preferably MgO powder.