Procedure for Simultaneous Deacidification and Sizing of Paper
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English Slovak |
| ISSN: | ISSN 0034-5806 |
| Online Access: | http://www.viks.sk/chk/res_4_95_175_193.doc |
| Abstract: | Conclusions. From the results obtained in the experimental work, we can conclude that: 1)Simultaneous sizing and deacidification improves the mechanical strength of the sample sheets treated, doubling or even quadrupling the initial values of tensile strength of paper. 2) Sizing with methylcellulose solutions of high viscosity requires a contact time long enough (more than 30 minutes) for effective impregnation. If the sizing agent does not penetrate deeply, folding endurance remains low. 3) Tensile test has proved to be more useful than the folding test in making conclusions about the effectiveness of treatment, as tensile results are more homogeneous. 4) Advantages of the simultaneous deacidification and sizing procedure which can be outlined, compared with traditional methods: ˙ better penetration of sizing agent; ˙ better mechanical properties, with higher improvements over initial strength values; ˙ better dimensional stability; ˙ shorter treatment time; and ˙ higher production capacity than manual procedures, sheet by sheet. 5) As the goal of the study was to establish an optimum working method to pursue the restoration of the second book, the following recipe was chosen: Concentration of Tylose MH300, between 0.5 and 0.75% w/w, Semisaturated solution of Ca(OH)2, about 0.08 % w/w Impregnation time: 30-45 minutes. This study will be continued by testing a method that combines the reintegration of perforated pages with simultaneous deacidification and sizing, in a quick, simple and effective manner, by using a sheet-forming machine. Summaries. The improvement of mechanical properties of the paper from an old book after different restoration treatments has been investigated. It showed that simultaneous deacidification and sizing with a mixed solution of calcium hydroxide and methylcellulose provides more uniformity to the restored paper than phase treatments. Conditions of washing, bleaching, deacidification and sizing have been established in order to restore the original quality of the paper, which has also increased its resistance and durability. |
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| ISSN: | ISSN 0034-5806 |
