One of the hottest development and application of

2022-08-13
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One of the development and application of special paper in the world

preface

special paper generally refers to a kind of paper with a specific performance, purpose and high added value. Special paper can be roughly divided into traditional special paper and special special paper. Traditional special paper is used for special packaging, printing and decoration purposes; Special special paper requires unique processing means and special technology to manufacture. Products have unique properties and usually have small market capacity

the name of special paper was gradually spread after the 1960s, and some people call it special processing paper. It is generally believed that special paper originated from carbon free carbon paper developed by national cash register Co. in 1945. Later, other special paper was introduced continuously, which expanded people's vision and changed people's traditional view of paper. In terms of raw materials, special paper is not limited to plant fibers, but also non plant fibers such as mineral fibers, animal fibers, and man-made fibers (including inorganic fibers and synthetic fibers); In terms of structure, in addition to the fiber interlacing layer, the number of coating layers is also increased; In effect, it can be copied according to the design as needed. These are all things that were not available in the past

among the more than 5000 kinds of paper in the world today, only a small number of natural plant fiber paper is wet copied directly with water as the medium, most of which are processed paper and some non plant fiber paper. To endow paper and paper products with various functions, it is not enough to only use the properties of paper raw fibers themselves, but also to use the properties of aggregates after two-dimensional planar expansion of fibers, such as pores; The original shape, appearance and physicochemical properties of paper can be changed or improved by using various functions of paper after secondary processing, such as coating, compounding, molding, denaturation, finishing and other processes

from the perspective of market development, due to the continuous progress of new technology, the life cycle of special paper changes faster and faster. Such as typing wax paper, carbon paper has been replaced by computer plate making and carbon free carbon paper; In the comparison of raw materials, such as the competition between paper and plastic, paper and non-woven fabrics, special paper may also be replaced by other materials. For example, capacitor paper is replaced by polyester film, cellophane is replaced by polyethylene film, etc. In addition to market factors, special paper has high technical requirements for raw materials, paper machines, coating machines, chemical additives (such as high molecular polymers, surfactants, waterproof agents, oil repellents, antistatic agents, flame retardants, adhesives), etc

in Taiwan, China and Japan, the paper industry has also put forward the concept of functional paper (also known as functional paper). The so-called functional paper generally refers to a kind of paper with special functions made from non plant fibers. In September, 1962, some people in Japan's paper industry established the "functional paper" Research Association, taking the development of new paper varieties as its goal

Japan's special paper production level is in the leading position in the world. At present, there are nearly 100 enterprises engaged in special paper production. In 1998, the total output of Japanese specialty paper was 900000 tons, accounting for about 5% of the total output of paper, and its product price was 1. 5% of the price of ordinary paper Times. In the United States and Japan, small paper mills rely on the production of various kinds of industrial paper in small batches to help them achieve the two most important goals at present - to improve fuel efficiency, and to supply special household paper alone. Users with special needs can also be vibrant and develop stably

China lags behind the United States, Japan and European countries in the development and production of special paper, and there is a big gap with the advanced level of foreign countries on the whole. However, through adjustment and development, optimization and innovation in recent years, a number of enterprises with complete varieties and characteristics have emerged, which have strong competitiveness in the domestic special paper market, and some products have begun to be exported. At present, domestic special paper has occupied the dominant position in the domestic market in some varieties, but in some special paper with high technical content and a certain domestic market, foreign products still occupy the dominant position

on the other hand, compared with foreign paper giants, China's paper-making enterprises are obviously lack of confidence and do not have competitive advantages. Small and medium-sized enterprises are particularly limited by technology, capital and management level. Therefore, small and medium-sized paper enterprises should develop more in the direction of diversification; Moreover, small paper machines, rather than large ones, facilitate the production of multiple varieties of paper machines. Large paper machines have high output, advanced equipment, high degree of automation and low unit energy consumption, but they have large investment, high risk and poor adaptability to multi paper production. The new small paper machine has less investment, less risk, compact equipment structure and small floor area, and adopts advanced technologies such as pressure forming, direct paper drawing, hot pressing, soft calendering, which greatly improves the equipment level of the paper machine; It not only overcomes the shortcomings of the traditional small paper machine, such as low degree of automation and high unit energy consumption, but also overcomes the shortcomings of large paper machine, such as large investment and high risk, and integrates the advantages of large paper machine, such as high degree of automation, low unit energy consumption, easy operation, etc., which has a wider adaptability to paper. China's small and medium-sized paper enterprises should find another way to introduce, develop and configure new small paper machines, which can not only meet the requirements of ordinary paper production, but also produce special paper, so as to enhance market competitiveness

therefore, accelerating the development of China's own special paper and functional paper products and participating in the competition in the international market is the top priority for Chinese special paper enterprises to improve their competitiveness and product added value. The research and development of special paper in China started relatively late, but with the improvement of people's living and cultural level and the progress of science and technology, it is bound to promote the greater expansion of special paper in the field of new material application, and the prospect is very broad; At the same time, after China's accession to the WTO, economic exchanges are more frequent, which is conducive to the development of small batch special paper export market, with better prospects and more opportunities

now, I will introduce some special paper that the author operates, understands, is familiar with, and learned from various channels as follows, with a view to attracting jade and attracting the attention of scholars and enterprises in the industry to the field of special paper. Limited to the author's level, knowledge and writing time, the special paper introduced in this paper is only a small part of the existing special paper product family in the world. I hope more experts will give their opinions. The invention of papermaking is China's great contribution to mankind. It is believed that with the joint efforts of peers in the industry, China's special paper industry will get greater development, narrow the gap with developed countries as soon as possible, and add new luster to the ancient country of papermaking

I. cultural special paper

1) carbon free carbon copy paper (carbon free paper)

it is generally believed that the first special paper is NCR paper developed by national cash register company of the United States in 1945. This kind of paper is not obviously different from ordinary paper in appearance, but it can be used for copying, producing the same effect as blue carbon paper, and will not stain fingers and clothes, which is more convenient and hygienic. Because this kind of paper is made without carbon material, it is called carbon free copy paper, or carbon free paper for short

why should carbon free copy paper be included in the list of special paper? First, paper has a special structure. Carbon free paper is generally divided into upper, middle and lower pages, and each page has three different layers of structure, which was not available in the past ordinary paper; Secondly, the added chemicals are special. For example, carbon free paper needs to prepare microcapsules, using colorless dyes, chromogenic agents, etc., while ordinary paper only needs to add general chemicals (such as rosin gum, modified starch); Third, the processing technology is special. The application of carbon free paper varies from surface to surface, requiring multiple applications, and the processing technology is difficult. Ordinary paper sometimes does not need to be processed separately; Fourth, the application field is special. Carbon free paper is mostly used in financial, aerospace, electronic communications, national defense and military departments

2) special books and periodicals printing paper

generally speaking, books and periodicals printing and publishing cannot be separated from offset paper, offset books and periodicals paper, coated paper and so on. However, due to the rapid development of printing technology and the competition of multi-media, many advanced printing paper (with various names, such as munken paper, embossed paper, etc.) has become a new choice for the book publishing industry. These special paper products, which are suitable for special printing/packaging, have a wide variety of names, and quickly squeeze into the publishing industry of books and periodicals, breaking the old stereotype of the original "printing paper" and standard format, making special (Art) paper a new force, making books and periodicals take on a new look, and attracting more readers and collectors

3) anti leakage paper

a kind of paper with special surface treatment developed by Canadian company. Where confidentiality is required, just use the matching special pen - scriber to divide it. This kind of pen water is transparent and colorless, and contact with the paper will produce a complex pattern. The pattern does not hinder the reading of the article, but it will damage the copier sensitive impact testing machine complete set of equipment, impact testing machine, impact specimen notch broaching machine, impact specimen notch projector, low-temperature groove, and the accuracy force value is introduced in detail by Jinan assaying Technician: the normal work of the component makes a black belt appear in the confidential place in the copied article, so as to achieve the purpose of confidentiality

4) tamper proof paper

France has developed a tamper proof security paper "Secura". It adopts advanced compression printing technology. When the pressure generated by the pen tip, dot matrix printer or relief printing acts on the "Secura" paper, it will cause a chemical reaction with the interior of the paper fiber and the back of the paper, and a mark or text pattern will appear on the back of the paper one minute later. On the front of the paper, there is a layer of chemical agents, which can prevent documents from being painted, wiped, scratched, scratched and copied in color. If organic solvents, redox agents, acids, bases and other solvents are used to modify, the preparation will enter the paper fiber and leave a color mark in it. The surface of the paper is also attached with a layer of toner, such as scraping with an eraser or a knife, which will also produce a color mark inside the paper fiber on the surface of the paper

5) sounding paper

Olympus optical industry company of Japan has developed a kind of sounding paper, which can be heard by reading the fine dot barcode printed on the paper with a special scanning pen. The company cooperates with publishing houses to publish books that will make sound. The book uses a fine dot bar code with a width of 8.4 mm to record sound. With the help of a scanning pen, readers can hear sound from headphones

6) pressure paper

a kind of paper with strong elasticity and good toughness is made by adding synthetic fibers into wood fibers and then special processing. It can be used to print books, newspapers, magazines, business cards, etc., and is durable

7) nano waterproof paper

in daily life, ordinary paper is afraid of water and moisture; Although offset printing paper and electrostatic copying paper are waterproof and moisture-proof, they are inconvenient to write. In addition to maintaining the original writing, copying and other functions of the paper, nano waterproof paper also has the special properties of super hydrophobicity and moisture resistance, improving the printing surface strength and reducing the expansion rate that ordinary paper does not have. Because its increased cost is only about 10% of the cost of ordinary paper, this kind of nano waterproof paper has good market potential and can be used to print water-resistant books and periodicals, long-term preserved documents, military maps, etc

8) safety line paper

safety line is also called anti false line and Chamberlain line, which is beneficial when making paper

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