Development of Printing Paper Varieties (I)

First, as an important and traditional information carrier, paper production has been prosperous, and it is increasingly closely related to printing technology. Economic development, technological advancement, constantly put new demands on the variety of paper, the quality of paper and the performance of paper. In the 1980s, the Chinese printing industry and the Chinese paper industry jointly completed the transition from letterpress printing to offset printing and from the production of letterpress printing paper to the production of offset printing paper. At present, the use of letterpress printing for Chinese prints is rare and rare. Offset printing is almost entirely replaced by offset printing. Although China's paper industry still regards letterpress printing paper as a key product of industry statistics, the actual production is not past letterpress printing paper, and most of them are offset book and paper.
There is no stop on the road of development. Modern offset printing requires that the printing paper has a smoother surface, better printing performance, and can withstand large changes in temperature and moisture without curling. Internationally, the variety of printing papers has been extended upwards and a series of new varieties of mechanical pulp printing papers have been developed. In recent years, digital printing technology, office automation and the development of personal computers have brought newer and higher requirements to paper. Internationally, new series of laser printing papers and inkjet printing papers have been developed in the field of chemical pulp printing papers.
Now, consumer demand for print has increased. People not only want to obtain the necessary knowledge and information, but also hope that they can enjoy the enjoyment of beauty and leisure through reading and browsing of printed matter. Therefore, the variety of paper must continue to innovate.
The 21st century is the era of knowledge economy. The core of the knowledge economy is innovation. The knowledge economy can also be called "innovation economy." Innovation is also the soul and life of a company. Some forward-thinking papermakers have vowed to “beyond self, develop products, meet market demands, and conscientiously implement the development strategy of aligning the paper industry with the printing industry”, which should attract the attention of the paper industry professionals.
In a long period of time, the production and consumption of paper will continue to develop steadily. However, the paper varieties will undergo major changes. Some old varieties will be eliminated and some new varieties will emerge. New information technology will promote new paper varieties. At the same time, the paper industry will also face new challenges brought by consumers' desire to spend less, do more things, and do good things.
At the beginning of the 21st century, the basic trends in the development and development of printing paper varieties will be:
 meet the requirements of multi-color printing;
 Improve strength and reduce ration;
 Improve the optical performance and surface performance of paper;
Increase the amount of fillers and pigments;
 Use a variety of effective chemical additives;
Adapt to new printing ink, printing process and printing equipment requirements, with good printability and operating efficiency;
 To continue to expand the use of recycled fiber pulp (DIP) and create conditions;
 Develop a series of products to achieve a balance between use, quality and production costs.
With regard to the development of new varieties of international printing paper, a series of mechanical pulp printing paper series and chemical wood pulp printing paper series are briefly introduced below.
Second, the new varieties of mechanical pulp printing paper series can be divided into two categories: The first category is based on newsprint to improve, enhance and develop new types of extended non-coated machinery wood pulp printing paper, the second is A new type of coated mechanical pulp printing paper for color printing.
1 New varieties of non-coated mechanical pulp printing paper.
After a revolution in printing technology in which relief printing was transformed into offset printing, offset printing and thermosetting inks have become the mainstream of newspaper printing. At the same time, newsprint users no longer care about newsprint ash content below 3% of the quality indicators, but hope that newsprint should be low-quantity, high-intensity, good optical performance and printing performance. Therefore, paper companies have added fillers to newsprint in order to improve the opacity of newsprint paper and the ink repellency of printing inks; and on the surface of newsprint papers, surface treatment is performed to prevent them from falling off during offset printing. In the raw materials, the use of recycled wood pulp has also been minimized with chemical pulp, and a series of new varieties have been developed, such as refined newsprint (IN paper) and advanced newsprint (Super Improved Newsprint, SIN for short). Paper), super calendered paper (SC paper), surface-treated supercalendered paper (ST/SC paper), and pigmented paper (MFP paper).
Supercalendered paper (SC paper) is a non-coated mechanical wood pulp printing paper that was first developed by the Finnish paper industry using mechanical pulp as the main fiber material, adding a considerable number of fillers, and finishing with a supercalender. It can also be said graphically that SC paper is a high-fill, high-ash, high-grade newsprint paper. The SC paper has a basis weight of about 60 g/m 2 . There are three types of SC paper, SC-A paper filler content (20 ~ 30)%, SC-B paper filler content of 15%, SC-C paper without filler.
SC crepe paper is a typical high grade non-coated mechanical wood pulp paper. In the European market, the competition between SC paper and low weight coated paper (LW paper) is very intense. Some Finnish paper companies believe that the performance quality of SC paper can catch up with LWC paper. SC paper is still rare in the Chinese market. Domestically, Fujian Longyan Paper Industry Co., Ltd. invested RMB 6.8 billion to establish a production line that can produce SC paper. This production line was trial-produced in 1998. It produced high-quality newsprint in 1999 and was welcomed after it was put on the market. The plant uses the masson pine as raw material for pulping and is now adjusting its technology to meet the requirements for the production of SC paper. (To be continued)