caa a22 4500 37888638X CHVBK 20180305123443.0 cr unu---uuuuu 161128e200406 xx s 000 0 eng 10.1515/REST.2004.119 doi (NATIONALLICENCE)gruyter-10.1515/REST.2004.119 Freeze-drying of Water-damaged Paper Material [Elektronische Daten] [Antonio Capolongo, Antonello A. Barresi] Cryodessiccation d'objets en papier endommagés par l'eau The final goal of this work is to study the application of the freeze-drying process to water-damaged archival and library materials. Soaked samples, i.e. reams of modern blank paper (80 g/sheet) consisting of sheets 42 × 59 mm, simulating water-damaged paper material, were prepared and subjected to two different procedures, i.e. pre-freezing and evaporative-freezing respectively. The temperature was monitored in different positions of the sample by means of wire-thermocouples; pressure was monitored by a Pirani gauge; the loss of water at different times of the process was measured by weight control. The qualitative result of freeze-drying was evaluated visually and tactically and found to be acceptable. The average residual moisture content was lower than the initial one (1.0 ± 0.5 %) indicating an over-drying. Since it was verified that primary and secondary drying overlapped, a further reduction of process duration was not possible. Re-conditioning of rigid and brittle dried documents is recommended, in order to avoid mechanical damage. © 2004 K. G. Saur Verlag GmbH, Ortlerstr. 8, D-81373 München Capolongo Antonio Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy, Phone: +39-011-5644658; Fax: +39-011-5644699; E-mail: antonello.barresi@polito.it aut Barresi Antonello A. Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy, Phone: +39-011-5644658; Fax: +39-011-5644699; E-mail: antonello.barresi@polito.it aut Restaurator Walter de Gruyter GmbH & Co. KG 25/2(2004-06), 119-128 0034-5806 25:2<119 2004 25 REST https://doi.org/10.1515/REST.2004.119 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/REST.2004.119 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Capolongo Antonio Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy, Phone: +39-011-5644658; Fax: +39-011-5644699; E-mail: antonello.barresi@polito.it aut NATIONALLICENCE 700 1- Barresi Antonello A. Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy, Phone: +39-011-5644658; Fax: +39-011-5644699; E-mail: antonello.barresi@polito.it aut NATIONALLICENCE 773 0- Restaurator Walter de Gruyter GmbH & Co. KG 25/2(2004-06), 119-128 0034-5806 25:2<119 2004 25 REST CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter