The most popular printing paper in the 21st centur

2022-08-08
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The 21st century: printing paper varieties (Part 2)

some "low weight coated paper" in the Chinese market. The fiber raw materials in the base paper are chemical wood pulp and chemical straw pulp, and mechanical wood pulp is not used or used less. Therefore, all quality indicators cannot meet the requirements of genuine LWC paper. In the Chinese market, more and more LWC papers are imported. The selection of Rockwell hardness scales over the years is shown in table 2-2. The mouth volume has doubled

China's Yueyang Paper Group Company introduced alkaline hydrogen peroxide bleaching chemical mechanical pulp into "in the technical transformation project. Experts in the industry introduced a set of technical equipment and advanced equipment such as expected sizing, pressing and soft calendering. With bleached poplar chemical mechanical pulp as raw material and neutral papermaking technology, it produced qualified 65g/m2 low weight coated paper (note, this magazine had a special report). The low weight coated paper of the enterprise has high smoothness, good surface strength and high gloss. After trial printing, the paper has even inking, good ink absorption, bright printing color and clear image, which has a good development prospect

the weight of film coated offset paper (FCO paper) is (51 ~ 60) g/m2, and the coating amount on each side is (6 ~ 8) g/m2. The gloss of the finished paper is close to that of LWC paper, and the roughness is slightly higher than that of LWC paper. The bulk thickness and opacity are good. The ash content of FCO paper is (10 ~ 15)%, and that of base paper is only (4 ~ 5)%. FCO base paper contains more mechanical wood pulp and less chemical wood pulp. Therefore, the production cost of FCO paper is low

many paper-making enterprises in North America and Northern Europe have produced FCO paper and believe that FCO paper has good competitiveness and market prospects. FCO paper has not been seen in the Chinese paper market

In the 1980s, the Finnish paper industry transformed small paper machines and developed and produced mechanical finishing coated paper (MFC paper). Since 1986, four paper machines in Finland and one paper machine in Canada have been converted to MFC paper. The quantity of MFC paper is not specified, which is generally (52 ~ 70) g/m2. MFC paper has higher roughness, but better whiteness and loose thickness. MFC paper is not suitable for rotogravure printing, but works well for thermosetting offset printing. MFC paper is a kind of coated printing paper with low weight, high filler and blade coating. The base paper should have high strength, so it needs more chemical wood pulp, and the production cost is also high

At the turn of the century, digital information technology has received unprecedented attention, and the printing industry is no exception. With the continuous progress of science and technology, new types of paper serving digital information technology are emerging. These newly developed paper varieties can be collectively referred to as digital printing paper

almost all digital printing papers are made of bleached Kraft chemical wood pulp with high whiteness, with uniform blue light white. In the production of digital printing paper, bleached coniferous kraft pulp and bleached broad-leaved kraft pulp are generally used to match each other. The paper has good strength, opacity, loose thickness, stiffness and whiteness, and has uniform organization, smooth and clean paper surface, no fiber bundles, spots and dust, no hair and powder, and good optical and printing properties. In the manufacturing process, certain fillers, such as precipitated calcium carbonate, are generally added

the digital printing paper adopts neutral papermaking and neutral sizing, and applies various chemical additives, such as retention aids, reinforcing agents, lubricants, etc. It is reported that uncoated inkjet printing paper can have different effects with different sizing agents. Therefore, it is necessary to reasonably select sizing agents in production. Retention aid is another commonly used additive in the production of digital printing paper. The use of retention aids will often affect the evenness of the paper. Attention should be paid to this problem when the particulate retention aids are widely used. If paper is made with reconstituted fiber pulp, in order to compensate for the insufficient fiber strength, starch or synthetic resin reinforcing agent can be used to improve the strength of the paper

digital printing paper is mostly small-size paper, which requires high fiber bonding strength, cleanliness and difference on both sides of the paper. In order to prevent the paper surface from falling off wool and powder and entraining burrs, fragments and paper scraps, the paper cutting blade must be sharp. In order to improve the adhesion of paper fibers, the estimated amount of sizing can be used to squeeze into the off-road motorcycle that can just be loaded with Honda for surface treatment. The paper machine shall adopt an advanced top former to minimize the difference between the two sides of the paper. In addition, soft calendering shall be used to obtain good smoothness

at present, some domestic joint-venture papermaking enterprises, such as Kunshan Yalong paper products Co., Ltd. and Changshu Asia Pacific Paper Co., Ltd., have begun to use advanced technology and equipment to produce digital printing paper such as laser printing paper and ink-jet printing paper. These enterprises will become the main force in China's digital printing paper production at the beginning of the new century. It is also understood that some state-owned paper industries are also brewing the technical transformation project plan for the production of digital printing paper. I hope that the state-owned enterprises in China's paper industry can catch up and occupy a place in the digital printing paper market as soon as possible. Looking forward to the 21st century, papermaking and printing, which originated in China, will certainly rebuild their brilliance and expand their ambitions with the joint efforts of the new generation of Chinese printing and paper industry colleagues

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