aper wet deformation and permanent deformation produced in the wet and dry conditions. deformability
a4 paper to print adversely. Generally, a4 paper and paper deformation rate of the fiber type and paper production
related. Rag pulp paper grades deformation small, large chemical wood pulp paper create deformation unbleached
chemical pulp is more easily deformed than bleached chemical pulp. Second, the aging of a4 paper archives in
archives and use the process, archive a4 paper gradually undergoing irreversible change in appearance, structure and
properties of the various aspects, known as "aging" or "worsening." a4 paper aging embodied in three aspects,
namely, color, strength decreases and changes in chemical properties. 1. File a4 paper acidic hydrolysis of
cellulose. A4 paper archives department at all levels of the majority of the existing archives containing acid. Acid
is the most important factor causing Archives a4 paper aging and even chalking. Because the archives acid catalyzed
hydrolysis of cellulose degradation. Archives acids from paper brought to the acid; ② the acid gas in the air
and dust in the acidic substance is archives adsorbed; writing, printing on the archival material a4 paper
writing an aafter the file mildew, mold will secrete organic acids such as oxalic acid and citric acid;
cellulose, hemi-cellulose, especially wood Su produce acidic substances in the oxidation or hydrolysis. 2. File a4
paper enzymatic degradation of cellulose. When records storage relative humidity, the archive is easy to mildew.
Archives a4 paper yellow after mildew, stains little mechanical strength sharp decline, seriously damaged the
archives life. This metamorphism archives, mainly secreted by fungal cells in the metabolic processes caused by
various enzymes, the most important is the cellulase. Cellulase is a specialized hydrolysis of cellulose into the
insoluble biocatalyst soluble sugars. Cellulase catalytic intense, it is possible within three months of the a4
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