umpanies are producing the ink can be used to transfer the common cold peel multi-screen ink, they are actually similar. Less transparent inks (for dark shirts) the effect of transferring the production of goods is not very good, it is se method: check the appearance of the paper's disease, except a very few require the use of instruments, in general, are based on sensory identification, inspection methods are mainly the following categoriesther two se that determine the durability Archives a4 paper has three main: ① quality papermaking plant fiber raw materials; phys4 paper. In most cases, a4 paper caused by the action of light and heat of white decreased, and the strength is reduced, often referred to as "yellowing." Yellowing is one of the characteristics of aging a4 paper. (E) a4 paper variant of. a4 paper wet deformation and permanent deformation produced in the wet and dry conditions. ded 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: ① in the paper production process, such as mechanical papermaking cooking liquid, bleach, especially rosin sizing a4 paper brought to the acid; ② the acid gas in the air and dust in the acidic substance is archives adsorbed; ③ writing, printing on the archival material a4 paper writing an acid; ④ after the file mildew, mold will secrete organic acids such as oxalic acid and citric acid; ⑤ 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 paper cellulose destroyed 10% to 60%. Experiments show that after the archives a4 paper mildew firmness by 50% in five days, even if the long-term is not turning into a rotten brick. 3. Archives a4 paper photoaging. Archive long-term exposure to light, or through sun exposure, a4 paper will be different degrees of yellow hair brittle, or wet for newsprint archives for this change is particularly evident. This is a light prompted many chemicals to produce results on the photochemical reaction archives a4 paper. Potentially damaging light, the shorter wavelength of the light, the greater the radiation energy. Ultraviolet radiant energy which is great, it can cause serious damage. Archives a4 paper photoaging in the following three areas: (1) a4 paper dehydration, strength decreased. (2) Acceleration Profile a4 paper on various chemical reaction. (3) a4 paper cellulose pyrolysis. 4. Metal archives a4 paper the effects of aging. W



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