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Now, consumer demand for print has increased. People not only need the necessary knowledge and information, but also hope to enjoy the beauty and enjoyment of leisure. 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. Some foresighted and knowledgeable papermaking enterprises consciously implement the strategy of simultaneous development of the paper and printing industries, which should attract the attention of the entire papermaking industry. In a long period of time, the production and consumption of paper will continue to develop steadily. 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 beginning of the 21st century, the basic trends in the development and development of printing paper varieties are:
Meet the requirements of multi-color printing;
Improve strength and reduce ration;
Improve the paper's optical performance and surface performance;
Increase the amount of fillers and pigments;
Use a variety of effective chemical additives;
Adapt to the requirements of new printing ink, printing process and printing equipment, with good printability and operating efficiency;
To create conditions for the continuous expansion of the use of recycled fiber pulp (DIP);
Develop a series of products to achieve a balance between use, quality and production costs.
At present, the development of new varieties of international printing paper is based on mechanical wood pulp printing paper series and chemical wood pulp printing paper series, which are briefly described below.
The new varieties of mechanical pulp printing paper series can be divided into two categories: The first is the improvement, enhancement and development of new varieties of non-coated machinery wood pulp printing paper based on newsprint. The second category is a new type of coated mechanical pulp printing paper for color printing.
1. The new varieties of non-coated mechanical wood pulp printing papers have undergone a revolution in the printing technology of offset printing. The use of offset printing and thermosetting inks has 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 manufacturers have added fillers to newsprint in order to improve the opacity of newsprint and the ink receptivity of printing inks; and to surface-treat newsprint paper to prevent them from falling off during offset printing. A large number of recycled fiber pulps have also been used as raw materials to minimize the use of chemical wood pulp, and a series of new varieties have been developed, such as refined newsprint (IN paper) and advanced newsprint (Super Im-proved Newsprint). SIN paper, super calendered paper (SC paper), surface-treated supercalendered paper (ST/SC paper), and pigmented paper (M FP 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. 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 of 20 ~ 30%, SC-B paper filler content of 15%, SC-C paper without filler.
SC 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 quality of SC paper can catch up with LWC paper. SC paper is still rare in the Chinese market. At present, Fujian Longyan Paper Industry Co., Ltd. invested RMB 6.8 billion to establish a production line that can produce SC paper. The quality newsprint produced by this production line was welcomed after being 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.
Refined newsprint (IN paper) and premium newsprint (SIN paper) are premium newsprints filled with fillers and surface treated. After such treatment, not only can the optical properties and printing performance of the paper be improved, but also the whiteness of the paper can be improved, overcoming the problem of insufficient whiteness due to the use of recycled pulp.
The surface-treated supercalendered paper (ST/SC paper) was surface treated with a predetermined amount of size press and was finished with soft calendered SC paper. ST/SC paper has good smoothness, gloss, and gloss contrast.
Pigmenting Paper, also known as Machine Finished Pigmented Paper (hereinafter referred to as MFP paper), is a new type of mechanical pulp printing paper developed in Japan and is called "Bitokoshi" in the Japanese market. The M FP paper has a basis weight of 49 to 54 g/m 2 , which is an inexpensive substitute for LWC paper. The amount of fillers and pigments on the paper surface of the MFP paper increases, and the printing performance and whiteness are improved.
2. Coating machinery New varieties of wood pulp printing paper New types of coating machinery Wood pulp printing papers include: Lightweight Coated Paper (LWC), Film Coated O ffset Paper (FCO) And mechanical finishing coated paper (MFC-finished Coat-ed Paper, referred to as MFC paper). These varieties all have good color printing performance, and can be used to print inserts, leaflets, coupons, catalogues, samples, magazines, and other printed materials, of which LWC paper is particularly popular in the market.
Low-weight coated paper (LWC paper) is the standard product in the international market, with No. 5 low-quantity coated paper from North America. The basis weight of LWC paper is 58 to 61 g/m2, and the coating amount per side does not exceed 7 g/m2. The raw material of LWC paper base paper is still mechanical pulp, but in order to meet the strength requirements of raw paper, there are more bleached sulfate chemical wood pulp. The whiteness, gloss, and smoothness of LWC paper and the chemical pulp ratio in the base paper are the highest in the mechanical pulp printing paper product line. LWC paper has good opacity and bulk. In some "low-quantity coated papers" in China's market, the raw materials of fiber in the base paper are chemical wood pulp and chemical grass pulp, and no or less mechanical pulp is used, so all quality indicators do not meet the requirements of genuine LWC paper. . There are more and more LWC papers imported, and the annual import volume has doubled. China's Yueyang Paper Group has introduced advanced equipment such as alkaline hydrogen peroxide bleaching chemical mechanical pulp and technical equipment, as well as advanced equipment such as size press and soft calendering, to bleach bleached poplar chemical machinery pulp. , And the use of neutral paper technology, produced a qualified low-weight coated paper 65g/m2. The company's low-quantity coated paper has high smoothness, good surface strength, and high gloss; uniform ink on paper, good ink absorption, vivid printing colors, clear images, and good development prospects.
The coating weight of film-coated offset printing paper (FCO paper) is 51-60 g/m2, and the coating amount per side is 6-8 g/m2. The gloss of formed paper is close to the gloss of LWC paper, and the roughness is slightly higher than that of LWC paper. Degree, looseness and opacity are better. The paper ash of FCO paper is divided into 10 to 15%, and the ash content of the base paper is only 4 to 5%. FCO paper base paper has more mechanical wood pulp content and less chemical wood pulp content. Many papermaking companies in North America and Northern Europe have produced FCO papers and believe that FCO papers have good competitiveness and market prospects. In China's paper products market, FCO paper has not yet been seen.
In the 1980s, the Finnish paper industry transformed small newsprint machines and developed and produced mechanical finishing coated paper (MFC paper). After 1986, four paper machines in Finland and one paper machine in Canada converted MFC paper. The quantification of MFC paper is not clearly defined, and it is generally 52 to 70 g/m2. The roughness of MFC paper is higher, but the whiteness and bulk are better. MFC paper is not suitable for rotogravure printing, but performs well when subjected to thermosetting offset printing. MFC paper is a low-quantity, high-fill, coated printing paper produced by blade coating. The base paper must have high strength, so it needs more chemical wood pulp, and the production cost is also higher.
3. At the turn of the century in digital printing paper, digital information technology has received unprecedented attention, and the printing industry is no exception. With the continuous advancement of science and technology, new types of paper serving digital information technology are emerging. These newly developed paper types can be collectively referred to as digital printing paper.
Digital printing paper is almost always made from bleached kraft chemical wood pulp with a high degree of brightness, with a uniform blue-white color. The production of digital printing paper generally uses bleached conifer kraft wood pulp and bleached hardwood kraft wood pulp to match each other, and the resulting paper sheet has good strength, opacity, bulk, stiffness and whiteness, and uniform organization. The paper surface is smooth and clean, with no fiber bundles, spots and dust, lint-free powder, good optical properties and printing performance. In the manufacturing process, it is generally necessary to add certain fillers, such as precipitated calcium carbonate.
Digital printing paper uses neutral paper and neutral sizing, and applies a variety of chemical additives, such as retention aids, reinforcing agents, lubricants. It has been reported that the use of different sizing agents for non-coated ink jet printing papers can produce different effects, and therefore it is necessary to rationally select sizing agents for production. Retention aids are another common adjuvant in the production of digital printing paper. For papermaking using recycled fiber pulp, in order to compensate for insufficient fiber strength, starch or a synthetic resin enhancer can be used to increase the strength of paper.
Digital printing paper is mostly small-size paper, and has a high requirement for the fiber binding strength, cleanliness, and two-sided difference of the paper surface.
At present, some domestic joint venture papermaking companies, such as Kunshan Yalong Paper Products Co., Ltd. and Changshu Asia Pacific Paper Co., Ltd., have started to use advanced technology and equipment to produce digital printing papers such as laser printing paper and ink jet printing paper, and these enterprises will become our country. The main force of digital printing paper production in the new century. It is also understood that some state-owned enterprises are also planning to develop technological transformation projects for the production of digital printing paper. I hope that the state-owned enterprises in the paper industry will soon take a place in the digital printing paper market. Looking into the 21st century, papermaking and printing originating in China will be rebuilt with the joint efforts of a new generation of Chinese printing and papermaking colleagues.
As an information carrier, the production of paper has always been prosperous and 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, China's printing industry and paper industry jointly completed the process of converting from letterpress printing to offset printing. At present, the use of letterpress printing in our country's printed matter is very few, and almost all of it is offset printing. At present, China still regards letterpress printing paper as the key product of industry statistics, but the actual production is no longer the letterpress printing paper in the past, and most of them are offset printing books and paper. 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, with the development of digital printing technology, office automation and personal computers, new and higher requirements have been put forward for printing paper. Internationally, new series of laser printing papers and inkjet printing papers have been developed in the field of chemical pulp printing papers.