Introduction of some domestic special papers (Part 1)

Foreword

Special paper generally refers to a paper type with a specific performance and use, and a relatively 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 methods and special techniques to manufacture, products have unique properties, and usually have a small market capacity.

The name “special paper” has only gradually spread since the 1960s, and some people call it special processed paper. It is generally believed that specialty paper originates from carbon-free carbon paper that was successfully developed by the National Cash Register Co. in 1945. Later, other special papers were continuously introduced, which broadened people's horizons and changed people's traditional views on paper. In terms of raw materials, specialty papers are not limited to plant fibers, but non-plant fibers such as mineral fibers, animal fibers, and man-made fibers (including inorganic fibers and synthetic fibers) are also acceptable; structurally, in addition to fiber interwoven layers, a coating layer is also added Number; in effect, according to the need to copy according to design. These are not in the past.

Among the more than 5,000 kinds of papers available in the world today, the natural paper made of wet plants directly made of water is a minority. Most of them are processed paper and some paper made from non-plant-made fibers. To give various functions to paper and paper products, it is not enough to only use the performance of the paper raw fiber itself, but also to use the performance of the aggregate after the two-dimensional planar expansion of the fiber, such as the use of pores, etc .; after the secondary processing of paper The various functions produced, such as coating, compounding, forming, denaturing, finishing and other processes, change or improve the original shape, appearance and physical and chemical properties of the paper.

From the perspective of market development, due to the continuous advancement of new technologies, the life cycle of specialty papers is changing faster and faster. For example, typing wax paper and carbon paper have been replaced by computer-made plate and carbon-free carbon paper; in terms of the comparison of raw materials, such as the battle between paper and plastic, paper and non-woven fabric, special paper may also be replaced by other materials. For example, capacitor paper is replaced by polyester film, and cellophane is replaced by polyethylene film. In addition to market factors, specialty papers technically treat raw materials, paper machines, coating machines, chemical additives (such as high molecular polymers, surfactants, water repellents, oil repellents, antistatic agents, flame retardants, adhesives) ) Etc. have higher requirements.

In Taiwan, China and Japan, the paper industry has also proposed the concept of functional paper (also known as functional paper). The so-called functional paper generally refers to paper grades made of non-plant fibers and having special functions. In September 1962, some people in the Japanese paper industry established a "functional paper" research society, and the development of new paper as the goal of the society.

Japan's specialty paper production level is in a leading position in the world, and currently there are nearly 100 companies engaged in specialty paper production. In 1998, the total output of Japanese specialty paper was 900,000 tons, accounting for about 5% of the total paper output, and its product price was 1.6-6 times that of ordinary paper. In the United States and Japan, small paper mills rely on the production of multiple varieties and small batches of various industrial papers and special household papers to supply users with special needs independently, and they can also flourish and develop steadily.

China lags behind the United States, Japan and European countries in the development and production of specialty papers. On the whole, it is far behind the advanced level of foreign countries. However, through adjustment and development, optimization and innovation in recent years, a number of enterprises with more complete varieties and characteristics have emerged. They have strong competitiveness in the domestic specialty paper market, and some products have already been exported. At present, domestic specialty papers have occupied a dominant position in the domestic market in some varieties, but in some specialty papers with higher technological content and a certain market in China, foreign products still dominate.

On the other hand, compared with the scale of foreign paper-making giants, China's paper-making enterprises are obviously lack of confidence and do not have a competitive advantage. SMEs are particularly limited by technology, capital and management level. Therefore, small and medium-sized paper-making enterprises should develop more in the direction of diversification; moreover, paper machines that facilitate the production of multiple varieties are small paper machines rather than large paper machines. Large-scale paper machines have high output, advanced equipment, high degree of automation, and low unit energy consumption, but they have large investments, high risks, and poor adaptability to multi-paper production. The new small paper machine has less investment, low risk, compact equipment structure, small footprint, and adopts advanced technologies such as pressure forming, direct paper drawing, hot pressing, and soft calendering, which makes the paper machine equipment level very high. Great improvement; it not only overcomes the shortcomings of traditional small paper machine such as low automation and high unit energy consumption, but also overcomes the shortcomings of large paper machine investment and high risk, and incorporates large paper machine high degree of automation, low unit energy consumption, Easy to operate and other advantages, it has wider adaptability to paper grades. China's small and medium-sized paper-making enterprises should take a different approach and focus on the introduction, development, and configuration of new small paper machines, which can meet the requirements of ordinary paper production and special paper production, thereby enhancing market competitiveness.

Therefore, accelerating the development of China's own specialty paper and functional paper products and participating in the international market competition are the top priorities for Chinese specialty paper companies to improve their competitiveness and product added value. The research and development of special paper in China started late, but with the improvement of people's life and cultural level, and the progress of science and technology, it will certainly promote greater expansion of special paper in the application of new materials, 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 a small batch of special paper export market, and its prospects will be better and more opportunities.

Now I will introduce some of the specialty papers that the author manages, understands, familiarizes with, and learns from various channels as follows, with a view to throwing the bricks and attracting jade, attracting the attention of industry scholars and enterprises in the specialty paper field. Limited to the author's level, knowledge and writing time, the special paper introduced in this article is only a small part of the existing special paper product family in the world. I hope more experts will express their opinions. The invention of papermaking is China's tremendous contribution to mankind. I believe that with the joint efforts of industry peers, China's specialty paper industry will be further developed, and the gap with developed countries will be narrowed as soon as possible to add new brilliance to the ancient papermaking country.

1. Cultural Special Paper

1) Carbonless copy paper (carbonless paper)

Internationally, it is generally believed that the first special paper was NCR paper developed in 1945 by National Cash Register, a US national cash register company. This paper is not significantly different from ordinary paper in appearance, but it can be used for copying, producing the same effect as blue copying paper, and will not stain your fingers and clothing, making it more convenient and hygienic. Since this kind of paper is manufactured without carbon material composition, it is called carbonless carbon paper, or carbonless paper for short.

Why should carbonless carbon paper be classified as special paper? First, the structure of the paper is special. Carbonless paper is generally divided into upper, middle, and lower pages, and each page has three different layers of structure, which is not available in the past for ordinary paper; second, the added chemicals are special. For example, carbonless paper needs to prepare microcapsules, using colorless dyes, color developers, 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 carbonless paper varies according to the different surface layers, it needs to be applied multiple times, and the processing technology is more difficult. And ordinary paper sometimes does not need to be processed separately; Fourth, the application field is special. Most carbon-free papers are used in financial and fiscal, aerospace, electronic communications, defense and military sectors.

2) Special book printing paper

It is generally believed that the printing and publishing of books and periodicals are inseparable from offset paper, offset paper, coated paper and the like. However, due to the rapid advancement of printing technology and the competition of multiple media, many high-end printed floral papers (various names, such as Mongolian paper, embossed paper, etc.) have become a new choice for the book publishing industry. These special paper products suitable for special printing / packaging have many names, quickly squeezed into the book publishing industry, breaking the old "printing paper" domination of the world and the standard format, so that special (art) paper emerges, making the book look Renewed, attracting more readers and collectors.

3) Anti-leakage paper

A paper developed by a Canadian company with specially treated surfaces. In places where confidentiality is required, it can be divided by a matching special pen --- scriber. This pen is transparent and colorless, and it will produce a complicated pattern when it comes in contact with the paper. The pattern does not hinder the reading of the article, but it will destroy the normal operation of the sensitive elements of the copier, so that a black belt appears in the confidential place of the copied article, so as to achieve the purpose of confidentiality.

4) Tamper-proof paper

France developed a kind of tamper-resistant security paper "Secura". It uses advanced compression printing technology. When the pressure generated by the nib, dot matrix printer or letterpress is applied to the "Secura" paper, it will cause a chemical reaction with the inside of the paper fiber and the back of the paper. It will appear on the back of the paper after one minute. Symbols or text patterns. On the front of the paper, there is a layer of chemicals to prevent the document from being painted, wiped, scratched, scratched, and colored copied. If the organic solvent, redox agent, acid, alkali and other solvents are used for modification, the preparation will enter the paper fiber and leave a colored mark in it. A layer of toner is also attached to the surface of the paper. If it is scratched with an eraser or a knife, it will also produce a color mark on the surface of the paper to the inside of the paper fiber.

5) Sound paper

Japan Olympus Optical Industry Co., Ltd. has developed a kind of paper that can make sound. You can hear the sound by reading the thin dot bar code printed on the paper with a special scanning pen. The company cooperated with the publishing house to publish the vocal book. The book records sound with a thin dotted bar code of 8.4 mm wide. With the help of a scanning pen, the reader can hear the sound from the headphones.

6) Pressure-resistant paper

It is a kind of paper with strong elasticity and good toughness, which is made by adding synthetic fibers to wood fibers and then undergoing special processing. Use it to print books, magazines, business cards, etc., durable.

7) Nano waterproof paper

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

8) Security thread paper

The security thread is also called anti-counterfeiting thread and Chamberlain thread. It is a kind of anti-counterfeiting mark that uses a special device to add a thread made of metal or plastic to a specific position in a paper sheet during papermaking. With the development of science and technology and the improvement of craftsmanship, the safety line technology is constantly developing and there are many varieties.

At present, the invisible single-color and two-color fluorescent safety lines are used; they show an opaque pink color at room temperature. When a finger reaches a temperature of 37 ° C, the heat-sensitive security lines with microprinted text are displayed at the heating place; ultraviolet fluorescent text is printed Security line; the security line whose color changes with the observation angle; the laser holographic security line that not only can change the color but also include the pattern change function; the metal and magnetic security line detected with a specific instrument; to prevent the interval of the faked by the color copier from being exposed to The window safety line on paper. This safety line is a visible complete or intermittent (window opening) line embedded in the paper base. The shape of the line is straight, wavy, zigzag, etc. When copying the printed matter using this technology with a copier, the exposed metal wire will become a black intermittent dashed line; the magnetic safety wire made by applying magnetic paint, applying dye, local metal plating, force mesh, etc. . Safety thread paper technology is often used on box packaging materials such as cigarette packs.

9) Anti-copy paper

The so-called anti-copying is to prevent the original from being copied through the copier to produce exactly the same product as the original, so as to avoid forging purposes. The characteristic of copy-proof paper that hides text, patterns, and patterns by using background color pattern printing is that the background color pattern with almost no obstacles when printed or recognized is printed on the paper, which is a very fine dot pattern or hidden Text and pattern printing. Once copied, the patterns or hidden characters and patterns are clearly displayed.

A VIOD logo paper

Contains a substance that prevents color copying. When anti-counterfeit printed products such as trademarks are copied with a color copier or scanned by a scanner, it will clearly display the word "VIOD" and the logo is printed in black and white. This VIOD logo can be used on the packaging of CD-ROM, computer software, cosmetics, etc.

B Color copy-proof paper

The principle is to color the base paper with specific dyes and pigments. After copying, the paper is exposed. Because the text image part and the background have the same absorption, the contrast disappears. When exposed to the photoreceptor, almost full exposure, no contrast, all copies become black and it is impossible to form an image. The disadvantage of this method is that the original is not easy to identify. The currently practical color is reddish brown.

C Photochromic anti-copy paper

The so-called photochromism is that some characteristics change color after being illuminated, and return to the original color after leaving the illumination. Photochromic anti-counterfeiting paper is anti-counterfeiting paper containing these substances. This anti-copying paper is coated with chemically discolored (colored or decolorized) material on the paper base. During the copying process, it is stimulated by exposure to change color, so that there is no difference between the background part and the image part and cannot be copied. After the original left the copier, the background part returned to the colorless state again.

D Photoluminescence security paper

During copy exposure, light is emitted due to light excitation, and the copy becomes white and cannot be copied.

E fluorescent paper

Use the fluorescent substance on the paper base (add fluorescent additives or use fluorescent fibers in the papermaking process), and use the length of the emission wavelength of the fluorescent substance during the copying process to make the copy completely black or white, to achieve the purpose of copy prevention.

F Diffuse anti-copy paper

This type of anti-copy paper is coated with a material with a small diameter and a large emissivity on the surface of the paper base, such as aluminum powder, titanium dioxide with a particle size of 10, glass particles that absorb the red inner line, etc., covered by the diffuse emission of the paper surface Or reduce the contrast between the paper and the image, make the copy appear black and achieve the purpose of preventing copying.

G Polarization anti-copy paper

This copy-protection paper is made of a polarizing film covered on the paper base, which uses the dichroism of light during copying to reduce the contrast between the words and the paper to the photosensitive drum and make the copy black.

H thermochromic anti-copy paper

This anti-copying paper is coated on the paper base with a thermochromic material that is colorless at normal temperature. When copying, the color is developed due to the heat of the copying machine, so that the contrast between the image portion and the background disappears and copying is not possible. When the temperature is restored to normal temperature, the background color becomes the original colorless state. At present, colorless materials with fluoranine decolorization, phenol color developing agent, aminophenyl mercury dithizone salt, etc. are used.

Second, daily life special paper

1) Clothing paper

In the past, "generation cloth paper" obtained by chemical treatment of base paper was used as tablecloths, bed sheets, hand towels, etc. for disposable use. However, in recent years, the call for protecting resources and the environment has been increasing day by day, and the view of "one-time use" has been regarded as "stale". Therefore, "clothing paper" was developed abroad. This kind of paper is as flexible as cloth and can be ironed. The paper dress made with this kind of paper is novel in style and attractive in color. The new wedding dress made of clothing paper is not new. Because the new wedding dress is only worn once at the wedding, using paper to make it is more economical.

2) Water-soluble paper (water-soluble paper)

Water-soluble paper can dissolve all by itself after soaking for one or two minutes in water. If stirring or scouring is added, the dissolution will be faster. This kind of paper was originally developed in the United States in response to the special requirements of the federal security department, and was used as a secret for a long time, so its scope of use was very narrow, and it was not allowed to expand publicity at will. However, scientific knowledge is constantly spreading, so a variety of water-soluble papers appeared later.

The appearance of this kind of paper is similar to that of ordinary paper, and the production process is basically the same, but the selection of raw materials and post-treatment processes are not the same. The paper has high requirements for pulp dispersion, online uniformity and off-cylinder. The sodium salt of carboxymethyl cellulose contained in water-soluble paper is at least two-thirds, and the other one-third is pulp and additives. After beating, the pulp is mixed with sodium carboxymethyl cellulose, and after adjustment, it is sent to the paper machine for paper making. The finished paper is also processed to make it into a soluble chemical structure, and finally cut and packaged. From post-processing to packaging, water is strictly prohibited in all operations to ensure the quality of the finished paper. This water-soluble paper can be written and printed. When it encounters a situation, it is flushed into the toilet, and the paper disappears without a trace; it is used for packaging medicines or condiments, and can be used without unpacking; it can also be processed into women's makeup Paper is very popular with consumers.

3) Vacuum cleaner bagging paper

It is used for vacuum cleaner to collect dust. It is a one-time use and consumes a lot in Europe, America and developed countries. The paper is generally composed of two or three layers, and the product quality requirements are high. The paper needs to be loose and breathable to facilitate the exhaust of the vacuum cleaner, and at the same time, it needs to have high burst resistance and tensile strength. Domestic paper-making enterprises can transform and produce vacuum cleaner bagging paper on a small paper machine. After the base paper is produced, the bags can be processed by themselves and exported with professional vacuum cleaner suppliers.

4) Colored paper rope paper

It is mainly used for the production of handicrafts such as colored paper ropes, woven craft baskets, craft hats, etc. It can replace the corncob leather rubbing rope, and has the characteristics of high efficiency, stable product quality and high industrialization level. Papermaking enterprises can transform the 1092mm rotary screen paper machine for production. There are many varieties of paper rope paper, and the products have strong toughness and tensile strength. There are now paper samples for manufacturers to choose.

5) Lampshade paper

It is mainly used in the production of lampshade materials for mid-to-high-end lighting, and there are many varieties. The most high-end is imitation parchment paper, which has a simulated bloodshot, wrinkle, and thick leather texture; mid-range paper has silk texture, thick and thin linen; and hand-made paper with flowers, leaves and other decorations Goods. These copying effects are to increase the antique, artistic and abstract feeling of the lighting under the soft lighting, so as to improve the artistic and commercial value of the lighting. The papermaking technology of lampshade paper mainly relies on the raw material ratio and papermaking technology to increase the strength, even increase the flame retardant performance and other technical means, and the changes are rich. Such products need to be combined with art, and it is possible to produce many varieties and small batches of special art paper.

6) Substitute paper

Adding some wet strength agent synthetic paper to the fiber raw materials can be used to manufacture special products such as disposable clothes, bed sheets, tablecloths, hand towels, which are both hygienic and convenient.

7) Japanese paper

The "Japanese paper" developed by Japan has the characteristics of low basis weight, wet strength, large stretch rate, soft paper, scrub resistance, and can be cut into narrow width paper. It is mainly used for pressure sensitive collagen paper, artificial flower paper and Disposable wet towel base paper, etc. Especially used as a raw material for towels and bath towels, it has achieved good results. Compared with other materials, towels and bath towels produced with "Japanese paper" have a strong unevenness and good scrubbing effect. The paper is soft when it meets water, does not hurt the skin, and has moderate irritation and friction, especially its water absorption, water permeability and speed. Dry performance, very suitable for making bath towels, has become a popular new product on the market.

8) Paper for textile materials

In recent years, on the basis of the production and development of "Japanese paper", Japan has used paper as a raw material for textiles, through dyeing, twisting and other processing techniques to form paper threads of varying thickness, which have been successfully used in the production of textiles. At present, paper for textile materials is developing to thin threads (narrow strip paper), such as 10mm, 6mm, and 4mm wide paper thread tubes. The narrower the paper, the thinner the twisting line, and the higher the strength requirements. The variety of textiles that can be produced The more. High-end T-shirts made of thin paper thread and silk twisted thread are already used in the Japanese market. Its breathability, sweat absorption and quick-drying are much better than cotton fabrics, and it is difficult to produce and high in technical content.

C) Special paper for building materials

1) Construction paper

The special paper used in construction can be exemplified by the "paper construction" selected at the Sydney Olympics. The gypsum board, asphalt paper, wallpaper board, etc. used in the past cannot be compared with today's new construction paper in terms of strength, stiffness, or waterproof performance. In addition to plant fiber paper, the new construction paper also uses polymer compounds.

2) Composite floor wear-resistant layer paper

In recent years, China has introduced a large number of composite flooring production lines, and the demand for wear-resistant paper for composite floor surface is increasing. Good wettability. The raw material is long fiber, and it has good body absorption when laminated with other materials and resins. Composite flooring has gradually become a new variety in flooring products, which requires the cooperation of professional material supporting manufacturers. With the increase in the amount of composite flooring, the added value and profit margin of wear-resistant paper is larger. Now is a good time to develop wear-resistant paper.

3) Color axis cotton brick backing

Color axis cotton brick is a new type of building decoration material that makes various buildings more magnificent. The decorative lining paper bonded to the color axis cotton bricks can improve the production efficiency of the cotton bricks and also facilitate the construction site construction. This kind of interleaving paper looks the same as ordinary paper from the outside, but the physical indicators are relatively special, which requires not only certain dry and warm strength, but also good water absorption properties.

4) Paper steel

Paper steel is a contemporary high-tech achievement. It is a new type of building material made of paper by mixing very fine metal wires and fibers in paper pulp. It is also called metal fiber paper. The thin one is only a few tenths of a millimeter, as thin as paper, but the strength is equivalent to steel; the thick one can be made of several layers of thin paper steel sheets bonded with synthetic resin, and the thickness is up to 2-3 cm. Paper steel can be made into plates, and can also be stamped and rolled into grooves, waves and various shaped materials.

Once paper steel came out, it showed strong vitality and broad prospects. In industry, agriculture, construction, defense military industry, daily life and other fields, they have played a wide range of roles. It has been used abroad to manufacture materials for cars, train compartments, and inner walls of aircraft fuselages. Lightweight houses made of paper steel can be assembled and transported, suitable for temporary workshops, classrooms and camping houses. The United States has built a paper bridge into a paper bridge with a span of 15 meters and a deck width of about 3 meters. Not only can it pass by pedestrians, but also small tractors and 2.5-ton jeep can pass through, and it can be installed and disassembled. The paper and steel materials used to build a bridge can be transported away with a Jiefang brand car, so it is suitable for military use. Thin paper steel is light and soft like gauze and plastic cloth, and can be used for daily necessities such as tablecloths, curtains, and sheets; thicker paper steel can be stamped into various utensils, such as bowls, basins, and boxes. All plastic products can be replaced with paper steel and will not age. Paper steel can also replace wood for chests, closets, boxes and other furniture.

5) Various new wallpapers

A heating wallpaper

The UK has successfully developed a wallpaper capable of dissipating heat. This kind of wallpaper is coated with a special paint coating. After the power is turned on, the paint can convert electrical energy into heat energy and emit heat, suitable for winter application.

B Hygroscopic wallpaper

Japan invented a hygroscopic wallpaper. The surface of this wallpaper is covered with countless tiny pores, which can absorb 100 ml of water per square meter, and is an ideal decoration for the wall of the bathroom.

C Anti-fungal propagation wallpaper

Japan has developed a wallpaper that is difficult for mold to reproduce. This kind of paper is added with anti-mold agent in the raw material PVC resin of wallpaper, even if there are bacteria on the wallpaper, it can not reproduce. The paper not only improves the living environment, but also benefits people's health.

D killing insect wallpaper

The United States invented a wallpaper that kills insects. Pests such as flies, mosquitoes, cockroaches will be killed as soon as they come into contact with this wallpaper, and their insecticidal efficacy can be maintained for 5 years. This wallpaper can be scrubbed, not afraid of water vapor and chemicals.

E absorbing wallpaper

The odor-absorbing wallpaper developed in Japan has certain chemicals that specifically absorb and decompose some odors, and is mixed with aromatic substances, so that the room is always fragrant, especially suitable for kitchens and toilets.

F Fire Alarm Wallpaper

The United States has developed a fire alarm wallpaper that has been used by many hotels. This kind of wallpaper will emit an odorless, colorless and harmless gas under high temperature and fire, thus triggering the ion type smoke detector to make it fire alarm, and then activate the fire extinguishing device to extinguish the fire source.

G Anti-eavesdropping wallpaper

Germany has developed a wallpaper that protects the room from electromagnetic interference and electronic eavesdropping. It is made of nylon non-proof cloth and copper skin, the screen performance is better than steel and galvanized iron skin, and it is not easy to be noticed.

H high shield wallpaper

The United Kingdom has developed a high-shielding wallpaper, which is nickel-plated on the surface of carbon fiber, which can completely shield high-sensitivity electronic equipment from electromagnetic waves and high-frequency noise, and prevent electronic reconnaissance activities. Its shielding effect can match the steel wall. , And can use ordinary adhesive paste.

I Non-combustible paper

Japan has developed non-combustible paper using calcium silicate as a raw material, which can be used as wallpaper and heat-resistant filler. During manufacturing, the silicate powder and lime water react with heat to extract fibrous calcium silicate, and then add glass fiber and paper reinforcement. Non-combustible paper can replace asbestos materials that are restricted due to environmental issues.

6) Furniture paper and paper furniture

Paper furniture first appeared in the 1920s. Paper furniture uses paper as the main raw material. First, the paper is water-repellent, and then wrapped into yarns by winding yarn, and then these "paper threads" are woven into "paper cloth" with a textile machine. When weaving cloth, the key part is to weave stainless steel wire into the weft, so that it can withstand greater pressure. The woven "paper cloth" is cut and matched with frames of different materials, and the edges are woven with perfect weaving techniques, and the baking paint is added, and then the glue treatment is carried out, which becomes a beautiful and practical furniture.

The material of paper furniture is taken from special paper fiber. This paper fiber material is light, strong, not afraid of moisture, and does not hide dirt. It has the advantages of waterproof, insect control, sun protection, anti-corrosion, anti-mildew, and no embrittlement. The visual sense is that the colors are gorgeous and full, the touch is smooth and delicate, regardless of high heat or severe cold, wet or dry, it does not fade, crack, and is not afraid of various outdoor environments in the open air.

The air permeability of the paper chair is good, and the thermal conductivity of the paper is similar to that of wood, making it cool and not sultry when used in summer; when it is used in winter, the body does not feel cold, and it can also be used with a chair cushion for more convenience.

Paper furniture has a variety of colors and can be combined with different home spaces to create a variety of home environments. In addition, for paper furniture, you can often change their cloth cover, making them rich in change, people often look new.

4. Special packaging paper

1) Stretch paper

Japan has successfully developed a stretch paper that uses wood and pulp as raw materials without any synthetic resin and can be directly compressed into packaging containers. This paper is 5 to 10 times more stretchable than plain paper. If a special metal mold is used, it can be directly pressed into paper packaging containers of various shapes. The paper packaging container has the same strength as the plastic packaging container and can be used to package daily necessities and food. Not only is the production cost quite low, but it can also be recycled, and it is expected to replace the plastic packaging container.

2) "Npimold Paper" deep stamping paper

Nippon Paper Co., Ltd. of Japan has developed deep-punched paper named "Npimold Paper" that uses natural fibers as its raw material. This kind of stamping paper can press characters, patterns and three sets of curved surfaces during press forming, similar to the processing of plastic products, and smooth the convex image processing to achieve better sealing. The production of this product can use the current plastic product equipment and be molded according to the design plan. Since heating and softening are not required before processing, it can improve production efficiency and save energy.

3) Paper flour bags Traditional flour bags are not satisfactory in terms of strength and moisture resistance. At present, the basic test of high-gram heavy kraft paper used to make flour in large and small bags is basically successful. The white chicken skin paper produced by using imported bleached softwood pulp has high whiteness, no fluorescence and strong pulling force, which meets the hygienic requirements. The paste bottom bag made with it adopts the trapezoidal bonding method, each layer is independently bonded, and the layers are glued together with points to make it more firm.

Compared with ordinary paper bags, this new paper bag is 1.5 times stronger. A four-layer paper bag full of 25 kilograms was dropped freely 15 times at a height of 1.5 meters without breaking the bag. The paper bag itself is hygroscopic. Under the same conditions, the shelf life of flour packed in paper bags is longer than that of cloth bags by 2-3 months. Another feature is that it is non-toxic, odorless, pollution-free, and meets food hygiene standards.

The advantages of paper grain bags such as hygienicity, quality-preserving function and strong flexibility have added strong market vitality to them. Develop these products as soon as possible and occupy the market share as soon as possible New subject.

4) Paper for special food packaging

A Solar insulation paper

It is a paper developed by the United States that can convert solar energy into heat energy. It acts like a solar collector. If you use it to pack food and put it in a place where it is exposed to sunlight, it will continue to collect heat. The food can be heated and kept warm until the paper is opened before the heat is dissipated.

B Far infrared packaging corrugated paper

The far-infrared packaging corrugated paper developed in Japan can be processed into a packaging box for packaging fruits, which can extend the retention period of the activated state of water molecules in the fruit, so that the fresh-keeping period of the fruit is longer than that of the general corrugated cardboard box. This kind of paper is coated on a corrugated paper made of 100% natural pulp, first coated with a ceramic that can emit far infrared rays, and then coated with a polyethylene film on the ceramic to prevent the ceramic from falling off.

C Edible antiseptic paper

Japan has developed a preservative paper that can be used for food packaging. Its production process is: first immerse the base paper in an ethanol solution containing 20% ​​succinic acid, 33% sodium succinate, and 0.07% sorbic acid, and then dry it. Using this kind of paper to package marinated food, it can be stored at 38 ℃ for 3 weeks without deterioration.

D Dehydration wrapping paper

Japan has developed a packaging paper with dehydration function without heating or additives. This paper selects a semi-permeable membrane that can permeate water as the surface material, and a high osmotic pressure substance and a polymer water-absorbing agent are placed on the inside. Since the osmotic pressure difference of the water in the food in the liquid state can move to the high osmotic pressure substance through the semi-permeable membrane, these water molecules are fixed by the polymer water-absorbing agent. The packaging paper will not destroy the food tissue cells, it absorbs water along the cell gap, not only can absorb the water on the surface of the food, but also can absorb the deep water inside, and also has the function of absorbing water at low temperature. This kind of packaging paper can inhibit enzyme activity, prevent protein decomposition, reduce microbial reproduction, and thus achieve the effects of maintaining food freshness, concentrating umami ingredients, removing moisture, and improving toughness.

E okara paper

The waste tofu residue is made into water-soluble paper, which can be widely used in the packaging of instant noodles, condiments, barbecue, cakes and fruits. Its preparation method is: adding fatty acid and protein acid to the bean curd residue to decompose it, and then washing it with warm water, drying the finished fiber, and then adding yam, taro, dextrin, oligosaccharide, polypropylene glycol and other adhesives. production.

F Pomace paper

Japan's Gaoqi Paper Co., Ltd. has developed a method for producing pomace paper from apple pomace discarded by the food industry. The production method is simple: remove the seeds from the pomace, pound it into pulp, and add an appropriate amount of wood fiber to make it. This kind of pomace paper is easy to decompose after use, it can be burned or composted, and it can be recycled and re-made paper, which is not easy to pollute the environment.

G Special film packaging

The Italian company Unifill has cooperated with Nippon Paper to introduce two types of shell-shaped paper packaging cheese that can be easily peeled off in the Japanese food industry. This kind of paper packaging adopting the special laminating technology pioneered by Unifeel is favored by the Japanese.

H vegetable paper

Vegetable paper was first developed by Japan, also known as paper dish. The common feature of vegetable foods is that they are rich in dietary fiber, various vitamins and minerals. Among them, dietary fiber is quite stable in processing and production, so the processed paper products have very little nutrient loss and the product moisture content is small (about 10%) For easy transportation and storage. It not only improves the added value of vegetables, but more importantly, it solves the problem that vegetables are perishable and not easy to store.

The research of vegetable paper products has opened up a new way for the deep processing of agricultural and sideline products, and has important practical significance for promoting agriculture and agricultural products processing.

Paper dishes can be used in many fields such as convenient snack foods and edible packaging. There are two kinds of edible paper, one is using vegetables as the main raw material, pulping the vegetables, and drying them after forming; the other is refining starch and sugar, and then adding other food additives. Method molding. From the perspective of application and development prospects, green products using vegetables as raw materials have more potential. As far as the production process is concerned, there are two main methods. The first method is the compression molding method. This method spreads the slurry on the molding board and forms it by baking twice; the other method is the roller molding method, that is, the slurry is rotated through two opposite directions. The pressing roller is directly pressed into a paper shape, sliced ​​and dried to obtain a finished product.

At present, only Japan has formed a certain scale in the production of vegetable paper in the world. The processing technology and equipment have entered the fourth generation. The maximum daily output can reach 30,000 sheets per production line per day.

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