Paper papermaking spread in our country by the invention and development of Jinzhong NCR, throughout the country. To the beginning of the 7th century (khanate) Start East spread to Korea, Japan; West 8th century Samarkand passed, which later became Arabia, followed paternity Rubageda; the 10th century to the Great Ma Shige, Cairo; 11 century into Morocco; the 13th century into India; 14th century Italy, NCR factory, Italy many cities have built a paper mill, has become an important base for European papermaking spread, NCR supply, and from there spread to German , United Kingdom; 16 century into Russia, the Netherlands; the 17th century reached the United Kingdom; the 19th century into Canada. PH (PH value) indicators. Usually pH 6.7 or less acidic paper, 7.2 ± 0.5 for the neutral paper. Acid paper is generally used for writing and general printing. High acidity adversely affects the machine, so the general requirements for neutral paper copy. Grass is typically acidic paper pulp and paper, bamboo, wood pulp paper is generally neutral paper. Jinzhong NCR NCR wholesale _ _ Jinzhou Paper (certified merchants) are provided by Xinxiang City, New Materials Co., Ltd. Jinzhou. Xinxiang City, New Materials Co., Ltd. Jinzhou (www.hnjinzhou.com) is specialized in "non-carbon paper, carbonless paper, carbonless paper roll" of the enterprise, the company adhering to the "honesty, hard service" concept, for you provide the highest quality products and services. Welcome to inquire! Contact: Wang Qiang.