Device and method for batch deacidification of paper documents

Abstract

The invention relates to the field of machinery and especially relates to a device and a method for batch deacidification of paper documents. The device comprises a deacidification liquid tank which is connected with a feeding pump through a pipeline, wherein the feeding pump is connected with a deacidification reactor through the pipeline; a rotating roller is contained in the deacidification reactor; an opening in one side is contained in the rotating roller; the deacidification reactor is connected with a vacuum pump through the pipeline; the vacuum pump is connected with a cooling recycler through the pipeline; the cooling recycler is connected with the deacidification liquid tank; matters harmful to environment are not generated by the deacidification agent and the deacidification process; the deacidification operation process is safe and reliable; no part of the documents is damaged, destroyed, faded or bled; the deacidification agent does not damage the paper fibers or have chemical reaction possible to damage the documents with fibers, fillers, dyes, pigments, etc.; the service life can be prolonged for 3-5 times; the deacidification in volume and batch can be realized.

Description

technical field [0001] The invention relates to the field of machinery, in particular to a device and method suitable for batch deacidification of paper documents. Background technique [0002] Since the mid-eighteenth century, the mechanical papermaking process has gradually matured. The raw materials for papermaking have begun to use cheap wood, bamboo and straw. These raw materials have low lignin content and are acidic in nature or produce acidic derivatives when oxidized and hydrolyzed. At the same time, the sulfite process used in mechanical papermaking and acid sizing such as alum and animal glue have buried hidden dangers for the acidification of paper, and the acidification of paper has been exacerbated by external acidic substances such as increasingly serious environmental pollution. Paper acidification has become a worldwide problem affecting document preservation, and two-thirds of the world's historical and precious books are under the threat of acidification. ...

AI Technical Summary

Problems solved by technology

After paper saver deacidification, the pH value of the paper can be increased to 8-9, and the alkali residue can reach 1-2%. The disadvantages are also obvious. On the one hand, the paper strength of about 40% of books and 2 / 3 of archive materials is reduced After the aging test, 16% of the books and nearly 1 / 3 of the archival materials had no obvious deacidification effect. On the other hand, after deacidification, some documents showed discoloration of paper, white precipitates, fading and diffusion of handwriting, and Some unpleasant smell papers have different handles and uneven deacidification effects after treatment; in the mid-1980s in China, Nanjing Museum and Renmin University of China successively developed paper vapor phase deacidification technology, but due to the serious environmental impact of the deacidification agent used Potential safety hazards, the popularization and application are limited, the State Archives Bureau, Shanghai Library and other units have also conducted research on the application of deacidification of paper, but only limited to the deacidification of single-page paper

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