Among the most popular printing paper varieties in

2022-09-23
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The 21st century: printing paper varieties (middle)

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new varieties of mechanical wood pulp printing paper series can be divided into two categories: the first category is a new variety of uncoated mechanical wood pulp printing paper that is improved, improved and developed on the basis of paper, and the second category is a new variety of coated mechanical wood pulp printing paper for color printing

1. A new variety of uncoated mechanical wood pulp printing paper

after the printing technology revolution from relief printing to offset printing, offset printing and thermosetting ink have become the mainstream of newspaper printing. At the same time, users of the spring fatigue testing machine only have an accurate grasp of the working environment of the testing machine and the usual protective paper. Users no longer care about the quality index of paper ash content below 3%, but hope that the paper will have low weight, high strength, good optical performance and printing performance. Therefore, paper enterprises have added fillers to paper in order to improve the opacity of paper and the inkability of printing ink; The surface treatment shall be carried out on the paper surface to prevent wool and powder from falling out during offset printing. In terms of raw materials, we also try to use less chemical wood pulp and use a large number of recycled fiber pulp, and thus developed a series of new varieties, such as improved newspring (in paper for short), super improved newspring (sin paper for short), super calendered paper (SC paper), surface treatment super calendered paper (st/sc paper) and pigment paper (MFP paper), etc

super calendered paper (SC paper) is the first in the Finnish paper industry, and the validity of its experimental results will be questioned. It is a non coated mechanical wood pulp printing paper developed first, which takes mechanical wood pulp as the main fiber raw material, adds a considerable amount of filler, and is finished by the super calender. It can also be vividly said that SC paper is a high-grade paper with high filler and high ash content. The ration of SC paper is about 60g/m2. There are three varieties of SC paper. The filler content of SC-A paper is (20 ~ 30)%, that of sc-b paper is 15%, and that of sc-C paper is without filler

sc paper is a typical advanced variety of uncoated mechanical wood pulp paper. In the European market, the competition between SC paper and LW paper is very fierce. Some Finnish paper enterprises believe that the performance and quality of SC paper can catch up with LWC paper. SC paper is rare in the Chinese market. In China, Fujian Longyan paper industry company has invested 6.8 billion yuan to establish a production line that can produce SC paper. This production line was put into trial production in 1998 and produced high-quality paper in 1999. It was popular after it was put on the market. The plant uses Pinus massoniana as raw material for pulping, and is now adjusting its technology to meet the requirements of producing SC paper

refined paper (in paper) and advanced paper (sin paper) are high-quality papers with fillers and surface treatment. After this treatment, not only the optical and printing properties of the paper can be improved, but also the whiteness of the paper can be improved, and the problem of insufficient whiteness caused by the use of recycled pulp can be overcome

surface treatment super calendered paper (st/sc paper) is SC paper that is surface treated with an estimated amount of sizing press and finished by soft calendering. St/sc paper has good smoothness, gloss and gloss contrast

pigmented paper, also known as machine finished pigmented paper (MFP paper for short), is a new variety of mechanical wood pulp printing paper developed in Japan. It is called "bitokoshi" in the Japanese market. The quantity of MFP paper is (49 ~ 54) g/m2, which is a cheap substitute for LWC paper. The amount of filler and pigment on the surface of MFP paper increases, and the printing performance and whiteness are improved

2. New varieties of coated mechanical wood pulp printing paper

new varieties of coated mechanical wood pulp printing paper include: light coated paper (LWC paper for short), film coated offset paper (FCO paper for short) and machine finished coated paper (MFC paper for short). These varieties have good color printing performance, and can print inserts, leaflets, coupons, catalogues, samples, magazines and other printed materials, among which LWC paper is particularly popular in the market. The introduction of these three kinds of paper is as follows:

low weight coated paper (LWC paper): in the international market, North American No. 5 low weight coated paper is used as the standard product. The weight of LWC paper is (58 ~ 61) g/m2, and the coating amount of each side is not more than 7g/m2. LWC paper base paper is still mainly made of mechanical wood pulp, but in order to meet the strength requirements of base paper, it has driven the utilization and innovation of a batch of new materials with more bleached sulfate chemical wood pulp. The whiteness, gloss, smoothness of LWC paper and the ratio of chemical wood pulp in base paper are the highest in the series of mechanical wood pulp printing paper products. LWC paper products basically have good opacity and loose thickness. (to be continued)

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