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. Water used in the paper production process, metal machinery, cooking liquid, packing facilities etc. gave a4 paper left iron, copper, manganese, titanium, zinc, calcium, magnesium and other metal ions. Written, printed on archive a4 paper writing materials, falls on the archives of dust, dirt, metal file for binding and stored in a metal file cabinet, but also to a4 paper will bring a variety of metals. Although the content of the metal in the archives a4 paper's success, but on the aging process plays a4 paper archives should not be underestimated, mainly in: (1) the oxidation catalyst a4 paper cellulose degradation. Traces of iron, copper, cobalt and other metal ions in wet conditions or light, will catalyze a4 paper oxidation and embrittlement, so a4 paper yellow, brittle hair. (2) metal photosensitization. Copper ions, divalent ferric ions, two iron oxide, zinc oxide, etc. are photosensitizers. They absorb light and transfer leads to cellulose, hemicellulose light oxidative degradation is an important reason Archives a4 paper yellowing. In all variety of things, the harmful effects of iron most significant. Hazardous metal objects above both the acid paper or neutralized paper are present. The little metal content is an ancient handmade paper durability and long life one of the reasons. Archives a4 paper can not prevent metal contamination, when necessary, a precious archive by decontamination method for removing part of the metal ions. To inhibit metal by controlling the temperature and humidity in the light of measures taken to prevent and catalysis are more general significance.

Wave print a4 paper and process selection are as follows: 1, brochures, catalogs, catalogs, etc. Ningbo brochure printing such general choose 200G or 250G art paper cover, inside pages generally choose 128G or 200G of matte paper or coated paper, Meanwhile, in order to prevent the cover burst side, covered front and back covers generally recommend Asian film or coating film, and some require a little high, and in the design of the production will be asked to cover a part of the text logo or bronzing, hot silver, hollow or partially UV, in order to enhance the effect. 2, leaflets, color pages, folding and other such commonly used when printing color pages coated paper or matte paper between 128G to 200G, 1

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