Pargital printing presses, ink requirement for its large, the printing unit is required to be able to provide a large amount of ink transfer, but the sticker printing surface is smooth, greater density substrates, printing after the , its papermaking conditions, the ratio of raw material and there are also different, so check the appearance is based on a4 paper a4 paper actually see the two sides negotiated a standard inspection, check out the non-compliant a4 paper, paper known to have the appearance of disease a4 paper. Appearance paper types disease: the appearance of paper shapes disease mainly characterized by the appearance of the surface of a4 paper pattern to be named the difference, but also to a4 paper papermaking common defect be named. Paper disease more common are: air knife streaks, calendering streak, coating roll streak, cardboard warping edges, pits, spots, embossing, Zhezi, scrapers, etc. streak. Check the appearance of the paper's disease method: check the appearance of the disease in the paper, except a very few require the use of instruments, generally with sensory identification, inspection methods are mainly the following categories: Ying-ray inspection method: the cardboard facing the light source to look after, with a4 paper surface for the naked eye problems; flat look test method: a4 paper will be placed on a flat or inclined plane, the light from the top of the irradiated surface of the eye from the a4 paper about 30cm, eyes facing paper checks; tilted inspection method: in the flat look on the basis of inspection method, using both hands to raise the paper side, from a different angle tilted checks; hand touch test method: the naked eye is not easy to find the paper diseases, such as fine sand a4 paper and other surfaces to touch the surface of the hand flat cardboard check, while also touching on flat cardboard sheet to determine the severity of the disease; listen to the sound test method: hand pinch a4 paper side, shaking back and forth, listening to the extent of its audible . This is mainly to check a4 paper "body bone" while judging the severity of the disease in the paper. It also can tear a4 paper, observed a4 paper cores, or is to be printed a4 paper, also cut out a piece of A4 size, and this pattern in the same weight of A4 size a4 paper overlap, then pinch the end, to see whether two separate sheets of paper, there will be significant if separated, indicating the arrival of a4 paper with a pattern in terms of quality may have a greater difference. In gen


A4 Paper Manufacturers , A4 paper suppliers, A4 copy paper manufacturers 
www.a4papermanufacturers.com