Little knowledge about paper

1. Knowledge about paper

The earliest paper existed 2,200 years ago in the early Western Han Dynasty, but it was still very rough and not widely used. In 105 AD, Cai Lun of the Eastern Han Dynasty improved it and was considered the originator of modern papermaking.

The raw materials for papermaking are mainly plant fibers. In addition to the three main components of cellulose, hemicellulose, and lignin, the raw materials also contain other smaller components, such as resin, ash, etc. . There are also auxiliary ingredients such as sodium sulfate.

Paper is generally divided into two types: flat sheet and roll. Flat paper is mainly used for sheet-by-sheet use, such as for flatbed printer printing, writing, painting, etc. Web paper is mainly used for continuous processing machinery, such as rotary printing machines, bag making machines for continuous bag making, cigarette rolling machines for continuous wrapping of cigarettes, etc.

Extended information

Classification of paper:

1. According to the production method, it is divided into handmade paper and machine-made paper.

2. According to the thickness and weight of the paper, it is divided into paper and cardboard.

3. According to use, it can be divided into: packaging paper, printing paper, industrial paper, office, cultural paper, household paper and special paper.

Baidu Encyclopedia - Paper

2. Knowledge about paper

The earliest paper existed 2200 years ago, in the early Western Han Dynasty, but it was still very rough. , not widely used.

In 105 AD, Cai Lun of the Eastern Han Dynasty improved it and was considered the originator of modern papermaking. The raw materials for papermaking are mainly plant fibers. In addition to the three main components of cellulose, hemicellulose, and lignin, the raw materials also contain other smaller components, such as resin, ash, etc.

In addition, there are auxiliary ingredients such as sodium sulfate. Paper is generally divided into two types: flat sheet and roll.

Flat paper is mainly used for sheet-by-sheet use, such as for flatbed printers to print, write, draw, etc. Web paper is mainly used for continuous processing machinery, such as rotary printing machines, bag making machines for continuous bag making, cigarette rolling machines for continuous wrapping of cigarettes, etc.

Extended information on the classification of paper: 1. According to the production method, it is divided into handmade paper and machine-made paper. 2. According to the thickness and weight of the paper, it is divided into paper and cardboard.

3. According to use, it can be divided into: packaging paper, printing paper, industrial paper, office, cultural paper, household paper and special paper. Baidu Encyclopedia-Paper.

3. Some knowledge about paper

Paper In ancient times, ancestors mainly relied on knotting ropes to record records. Later, characters were gradually invented and oracle bones were used as writing materials.

Later, bamboo and wood chips and silk were discovered and used as writing materials. But because silk was too expensive and bamboo pieces were too heavy, this led to the invention of paper.

According to research, paper production began in my country during the Western Han Dynasty, and paper was widely circulated during the Wei, Jin, Southern and Northern Dynasties. Widely used by people, papermaking technology further improved.

Papermaking raw materials are also diverse. There are many types of paper, such as bamboo curtain paper, rattan paper, fish egg paper... Cai Lun papermaking has a wide range of raw materials. Paper made from rotten fishnets is called net paper, and paper made from rags. The paper is called cloth paper. During the Sui and Tang Dynasties, the famous rice paper was born.

(There is a legend in Xuanzhou, Anhui Province, the main producing area of ??rice paper: Kong Dan, Cai Lun’s apprentice, was engaged in papermaking in southern Anhui. He always wanted to create a particularly ideal white paper to replace his master’s rice paper. He came to paint and revise the portrait. But after many attempts, he could not get what he wanted.

Once, he accidentally saw some sandalwood trees falling next to a mountain stream. They were rotten and whitened by water over time. Later, he finally succeeded in making paper from this bark.

It can be concluded that the use of bark to make rice paper was more popular in the Tang Dynasty. In the Tang Dynasty, yellow paper was dyed. On top of that, wax is evenly applied on the paper to make the paper shiny and beautiful, which is called hard yellow paper.

The papermaking industry continued to develop during the Five Dynasties. Chengxintang paper made in Shezhou was recognized as the best paper until the Northern Song Dynasty. In the Ming and Qing Dynasties, the paper industry flourished and innovated again.

All kinds of paper became popular again. In terms of texture, white paper and elegant colored paper were favored. The colors were mainly bright and quiet, such as the pink wax paper in the Kangxi and Qianlong periods, printed patterns and dyed flowers. Paper, etc., the production of paper had reached a state of perfection by the Qing Dynasty. Papermaking process) Generally, the production of printing paper is divided into two basic processes: pulp and papermaking.

Pulping is to use mechanical methods, chemical methods, or a combination of the two to dissociate plant fiber raw materials into natural pulp or bleached pulp. Papermaking is the process of combining pulp fibers suspended in water through various processes into paper sheets that meet various requirements.

Paper mills generally need to store enough raw materials for 4 to 6 months, so that the raw materials can undergo natural fermentation during storage to facilitate pulping and ensure continuous production of the paper mill. In the material preparation section, raw materials such as reeds, wheat straw and wood are cut into pieces (for the production of chemical pulp) or wood pieces (for the production of groundwood pulp), and then the small pieces of raw materials are placed in the digester, chemical liquid is added, and steam is used for cooking , boil the raw materials into pulp, or send the wood pieces to a wood grinder to grind into pulp, or they can also be cooked to a certain extent and then ground into pulp.

The paper pulp is then washed with a large amount of clean water, and coarse flakes, knots, stones and sand in the pulp are removed through screening and purification. According to the requirements of the paper type, bleach is used to bleach the pulp to the required whiteness, and then the pulp is beaten using beating equipment.

Then various auxiliary materials such as fillers, gums, and sizing agents to improve the performance of the paper are added to the pulp, and are purified and screened again, and finally sent to the paper machine to undergo water filtration, press dehydration, The drying cylinder is used for drying, calendering, winding, and slitting, rewinding or cutting to produce roll paper and flat paper. If the production is to produce coated printing paper, the middle part needs to be dried or produced into web paper and then subjected to coating processing.

6 In addition to the above basic processes, it also includes some auxiliary processes, such as the preparation of cooking liquid, the preparation of bleaching liquid, the cooking of rubber materials, and the recovery of chemicals and heat energy in cooking waste liquid and waste gas. wait. Baqiao Paper: In 1957, ancient Western Han Dynasty paper from the 2nd century BC was unearthed in Baqiao, the eastern suburbs of Xi'an.

When it was unearthed, it was a stack of paper pieces, some large and some small, the largest was 10*10 cm, the smallest was 3*4 cm, beige. After repeated scientific tests, it was found that it is mainly made of hemp and a small amount of ramie fiber, that is to say, it is "plant fiber paper".

This ancient tomb was no later than the time of Emperor Wu of the Han Dynasty, that is, from 140 BC to 87 BC. Therefore, it can be concluded that more than 2,000 years ago, that is, in the 2nd century BC, my country had produced and Plant fiber paper is used. This kind of Baqiao paper is the earliest paper in the world unearthed by archeology.

Cai Lun Paper: Cai Lun, the inventor of papermaking in the Han Dynasty, was given the courtesy name Jingzhong. A native of Guiyang (now Chenzhou City, Hunan Province).

In the 18th year of Emperor Yongping's reign (75), he entered the palace as an eunuch. In the first year of Zhanghe of the Eastern Han Dynasty (87), he was appointed Shang Fangling.

Papermaking was invented in the first year of Yuanxing (105). He summarized the experience of his predecessors and discovered that bark, hemp heads, rags, old fishing nets and other raw materials were used to make paper through processes such as beating, pounding, copying and drying. It was called "Caihou Paper" and made great contributions to the reform and promotion of papermaking. , later generations passed down as the inventor of papermaking.

Papermaking is one of the four great inventions of ancient China and has made a huge contribution to the spread and development of world culture. Zuo Bozhi: After Cai Lun, others continued to improve his methods.

About eighty years after Cai Lun's death (the end of the Eastern Han Dynasty), another papermaking expert named Zuo Bo emerged. The paper he created was uniform in thickness, fine in texture, and bright in color.

At that time, people called this kind of paper "Zuo Bo Paper". It is a pity that the raw materials and manufacturing methods used by Zuo Bo were not recorded in history.

Rattan paper: During the Wei, Jin, Southern and Northern Dynasties, paper was widely circulated and widely used by people. Papermaking technology further improved, and the papermaking area was concentrated in Luoyang, Henan before the Jin Dynasty and gradually spread to Yue, Shu, Shao, and In Yang, Anhui, Jiangxi and other places, the output and quality are increasing day by day. The raw materials for papermaking are also diverse, and there are many types of paper.

There is rattan paper in Yanxi, which is made of rattan bark. The paper is even, fine and smooth, as white as jade, and does not retain ink. Attachment: The history of paper Paper is one of the four great inventions of science and technology in ancient my country. Together with the compass, gunpowder, and printing, it provided the material and technological foundation for the prosperity of ancient Chinese culture.

The invention of paper ended the complicated history of ancient bamboo slips and greatly promoted the spread and development of culture. In ancient times, ancestors mainly relied on knotting ropes to keep records. Later, they gradually invented writing and began to use oracle bones as writing materials.

Later, bamboo and wood chips (i.e. bamboo slips) and silk were discovered and used as writing materials. But because silk was too expensive and bamboo was too heavy, this led to the invention of paper.

According to research, the production of paper had already begun in the Western Han Dynasty in my country. In 1957, the Shaanxi Provincial Museum unearthed a batch of physical objects called "Baqiao Paper" from a Western Han tomb near Baqiao in the eastern suburbs of Xi'an. Their production date should not be later than the era of Emperor Wu of the Western Han Dynasty.

Later in Luobu, Xinjiang.

4. Cherish paper information

The surge in demand for pulp is one of the reasons for the increase in wood consumption.

The country’s annual papermaking consumption is 10 million cubic meters of wood, more than 1.3 million tons of wood pulp is imported, and more than 4 million tons of paper pulp are imported. How many trees will be cut down? The massive waste of paper not only causes forest destruction, but also seriously pollutes rivers and lakes due to sewage discharged from production. You may not cut down the forest directly, but have you ever thought that wood is the main raw material for paper making, and wasting paper is equivalent to joining the ranks of deforestation.

Cherishing paper means cherishing our forest resources. Please do not throw away white paper casually and make full use of the blank space of paper. The paper that has been used on one side can be turned over to make scratch paper, note paper, or used as a homemade notebook. Expired wall calendars can be wrapped in book covers.

Refuse to accept those useless propaganda papers that are distributed everywhere. Producing these propaganda materials will not only waste a lot of paper, but also destroy the city appearance and hygiene by distributing and pasting them everywhere. You must be inseparable from paper when studying.

Did you know that a large amount of paper is made of wood, and 10 million cubic meters of wood are consumed annually in papermaking nationwide. The papermaking process also discharges a large amount of wastewater, polluting rivers. The pollution it causes accounts for more than 30% of the entire water pollution! Save paper.

It is to protect forests and rivers. ——Use exercise books sparingly, don’t throw away white paper casually, and make full use of the blank space on the paper.

——The paper that has been used on one side can be turned over to make scratch paper, note paper or a homemade notebook; expired calendar paper can be used to wrap book covers. ——Don’t send a large number of New Year’s cards during the New Year, because making beautiful New Year’s cards requires cutting down trees, and 4,000 greeting cards will require the sacrifice of a big tree, which will damage the environment.

——Support the "Reduce Cards and Save Trees" activity of college students' brothers and sisters, save the money spent on greeting cards to plant trees and protect nature. Recommendation: Actively promote the use of recycled paper and recycled paper products.

You can also use waste paper to make your own New Year’s cards, which is unique and meaningful. The surge in demand for pulp is one of the reasons for the growth in wood consumption.

The country’s annual papermaking consumption consumes 10 million cubic meters of wood, imports more than 1.3 million tons of wood pulp, and imports more than 4 million tons of paper. How many trees will be cut down! The massive consumption of paper not only causes forest destruction, but also severely pollutes rivers and lakes due to the discharge of sewage from pulp production (the pollution caused by the paper industry accounts for more than 30% of the entire water pollution). What kind of recycled paper products have you used? Have you ever seen business cards or books made from recycled paper? Recycled paper is paper made from waste paper.

In many countries, the use of recycled paper has become fashionable. People take it as an honor to show business cards with "Made from Recycled Paper" printed on them to show their environmental awareness and civilized upbringing. Many companies also stipulate that they use recycled paper for office supplies.

The United States has regulations that 60% of the paper used by government agencies must be recycled paper. my country's forest coverage rate is only 1/4 of the world average.

According to statistics, my country's forests have declined sharply by 23% in 10 years, and the logging stock has decreased by 50%. The natural forests in Xishuangbanna, Yunnan, have been disappearing at a rate of about 16,000 hectares every year since the 1950s.

The original forest cover of 55% at that time has now been reduced by half. The Japanese, who have a lot of etiquette, have also changed their habit of giving a large number of New Year's cards in recent years.

Some large companies have published advertisements stating that they will no longer send greetings by mailing New Year's cards. College students in my country organized the "Reduce Cards to Save Trees" campaign, advocating saving money on greeting cards to plant trees and protect nature.

——The paper that has been used on one side can be turned over to make scratch paper, note paper, or made into a notebook; expired wall calendars can be wrapped in book covers. ——Refuse to accept those useless propaganda papers that are distributed everywhere. The production of these propaganda materials will not only waste a lot of paper, but also destroy the city appearance and hygiene by distributing and posting them everywhere.

Activity goals 1. Attitudes, emotions, and values ??Make students aware of the impact of wasting paper on the environment and resources, proactively take measures to save paper, and assume the responsibility of protecting the environment. 2. Methods and processes: Organize students to investigate paper consumption, cultivate awareness of paper conservation, collect information on the history of papermaking and its relationship with the environment, interview staff of recycled paper mills, and design paper-saving designs based on the collected information. and waste paper recycling programmes.

3. Knowledge and ability enable students to understand the consumption of forest resources by large-scale paper making, the pollution of the environment by small paper mills, as well as the production methods of recycled paper and the importance of saving paper and using recycled paper in protecting the environment. . Background of the event: my country uses more than 100 million tons of paper every year, requiring a large amount of paper-making raw material - pulp.

Pulp mainly comes from wood and recycled waste paper. At present, my country's forest coverage rate is only 13.92%, and forest resources used for papermaking are in short supply.

In recent years, on the one hand, my country has spent a large amount of foreign exchange every year to import paper, paper plates and waste paper used as raw materials for paper making. On the other hand, domestic waste paper has been severely wasted due to low purchase prices. Waste paper is the preferred raw material for papermaking.

According to experts, using waste paper can not only reduce environmental pollution but also save resources and energy compared to using wood to make paper. Abroad, countries with rich forest resources attach great importance to waste paper recycling. For example, in Japan, the forest coverage rate is much higher than that in my country, and the waste paper recycling volume reaches 100 million tons, which is equivalent to the total paper consumption in my country every year.

In 1998, the Yangtze River Basin and the Northeast region suffered severe floods, which were closely related to indiscriminate deforestation and lack of attention to the protection of forest resources. Relevant people emphasized that with the reduction of logs, the raw material for papermaking, waste paper recycling should attract sufficient attention from the perspective of environmental protection and resource reuse.

Paper is a daily necessities for students. Guiding students to pay attention to the problems in the use and recycling of paper can help students establish the awareness of starting from small things and protecting the environment from themselves. Activity process The entire activity takes 3 class hours to complete.

Lesson 1: Guide students to discuss topics about paper: What do you know about paper? What else do you want to know about paper? Through this activity, students can actively pay attention to the actual use of paper in life, ask questions about paper, and on this basis, select and determine their own research topics, establish research groups, and formulate research plans. Lesson 2: Students carry out research and practical activities as planned.

Lesson 3: Display and communicate the results of preliminary research, conduct in-depth research and exploration, and finally complete the reflection and evaluation of the activity. Student Activities Teacher Guide Part 1: Basic Activities Lesson 1: Start by observing the waste paper recycling signs, focus on the issue of "paper", and start thinking about paper.

5. Please tell me some common sense and basic types of paper classification

There are many types of paper, which can be divided into cultural paper, industrial paper, There are six categories of packaging paper, household paper, information paper and special paper, which are briefly described as follows: Cultural paper: used for information transmission and cultural inheritance, so it is closely related to the printing industry. Common cultural paper such as copperplate Paper, light coated paper, Dowling paper, newsprint, Bible paper.

etc. Industrial paper: Paper or cardboard used to make cartons, cartons, paper cups, paper plates, etc. Because it requires further processing, it is called industrial paper. Common industrial papers such as kraft cardboard, corrugated paper, Coated white cardboard and gray cardboard.

etc. Packaging paper: Paper for making paper bags, shopping bags, and paper plastic bags. Common packaging papers such as cellophane, wrapping paper, and kraft paper for bags.

etc. Household paper: Paper related to health care or home life, such as toilet paper, facial tissue, diapers, napkins, paper towels, and medical paper.

etc. Information paper: It is called information paper in Japan. Due to the rise of office automation and computer list machines, it is a paper that has developed rapidly recently, such as non-carbon copy paper, photocopy paper, computer report paper, thermal recording paper (such as fax paper) ), electrostatic recording paper...etc.

Special paper: Paper made for special purposes, such as tissue paper, rice paper, greaseproof paper, antirust paper, and banknote paper. wait.

◎Cultural paper: coated paper, Dowling paper, molded paper, certificate paper, printing paper, drawing paper, poster paper, typing paper, Bible paper, postal seal paper, cigarette paper, glass Paper, newsprint, etc. 1. Coated paper - coated paper that is coated with paint on the surface of the base paper and then calendered. Its grades can be divided into the following categories: (1) Super coated paper (A0): the highest grade after two to three coatings Coated paper, the total coating amount per side is more than 25g/m2, the gloss is more than 80 degrees, the paper surface is extremely fine and smooth, the printing is very clear and bright, suitable for high-end albums, high unit price product catalogs, important documents, etc. Prints with extremely high quality requirements.

(2) Premium coated paper (A1): According to the general classification standards of the Japanese paper industry, high-grade coated paper with a coating amount of about 20g/m2 on each side has a smooth and delicate paper surface and excellent printability. (3) Coated paper (A2): It is divided into single-sided and double-sided coated paper. According to the Japanese paper industry classification standard, the coating amount on each side is about 10g/m2 or more. It is currently used in cultural publishing, advertising design, printing and binding. And one of the most commonly used paper types in the industrial and commercial circles.

(4) Lightweight coated paper (A3): Coated paper with a coating amount of about 7-10g/m2 on each side according to the Japanese Paper Industry Classification Standard. (5) Blunt coated paper: Coated paper coated with powder and calendered, with a glossiness of about 20 to 40 and high printing gloss.

(6) Snow-coated coated paper: Powder-coated calendered coated paper with a glossiness below 20 degrees. The paper is soft, non-reflective and does not harm eyesight. (7) Micro-coated paper: After pigment coating and calendering, the uniformity and smoothness of the paper surface are improved, and the ink holding capacity of the paper is improved.

(8) Marking paper: printing paper that is coated and processed directly on the paper machine. It is suitable for color, color registration, and monochrome printing. (9) Magazine paper: Lightly coated and calendered printing paper is the most commonly used paper type in magazines.

2. Daolin paper: printing and writing paper made from chemical pulp. It is currently one of the most commonly used paper types for cultural publishing and printing and binding. For example, the Daolin paper produced by our company has added The dyes give different paper colors, such as blue and white Dowling paper and beige Dowling paper. 3. Mold paper: Printing and writing paper made from chemical pulp and part of mechanical pulp. The paper quality is slightly worse than Dowling paper. It is slightly yellow in color, has good toughness, strong tensile strength and is cheap. It is widely used.

4. Laminated paper: It is a type of Dowling paper with strong toughness and rough surface to enhance the penetration and adhesion of the laminate and has the function of waterproofing and moisture-proofing. Our company also produces laminated paper and Yellow coated paper. 5. Printing paper: This type of molded paper is specially used for printing books. Due to eye protection issues, the paper is often light beige in color and its characteristics are roughly the same as those of general molded paper.

6. Drawing paper: The paper is slightly milky white in color, does not hurt eyesight, has strong durability, is resistant to wiping, is lint-free, has strong water absorption and color development power. 7. Securities paper: High-end writing paper that is durable and durable and can be used for securities, high-end documents and letters.

8. Poster paper: Thin-pound single-gloss paper, suitable for posters, slogans, calendars, and ten-line paper. 9. Typing paper: High-grade thin paper for typing and copying, suitable for reports, subpoenas and letter paper.

10. Bible paper: Contains a large amount of titanium dioxide filler. The paper is light and has high opacity. It is specially used for printing Bibles, dictionaries or aviation expresses. 11. Postal cover paper: Single-sided glossy paper used for copying documents and packaging stamps. The paper is extremely strong and has a strong luster on one side.

12. Cigarette paper: Contains a large amount of calcium carbonate filler, which acts as a buffer when the paper burns because calcium carbonate decomposes carbon dioxide and prevents the paper from burning too fast. 13. Glassine paper: Paper that has been highly beaten and then treated with a strong pressure calender. It is used in packaging, photo albums, stamp albums, etc.

14. Newsprint: The main raw material is groundwood pulp, the brightness is required to be above 55GE, and it needs to have appropriate oil permeability. ◎Household paper: generally refers to consumer cleaning tissue paper, including: facial tissue, napkins, bath and toilet paper, kitchen towels, sanitary napkins, etc.

1. Facial tissue: Tissue paper used for makeup and cleaning. Its raw materials are mostly bleached chemical pulp and spiral fiber pulp, and are processed into wrinkled shape. Its characteristics are not easy to tear, rich in softness, and not easy to fluff. , moisture-resistant, and must not contain migratory fluorescent agents. 2. Napkins: The paper used instead of napkins during meals is generally 100% virgin chemical pulp or mixed with part of virgin mechanical wood pulp. It must also not contain transferable fluorescent agents.

3. Kitchen towels: Use bleached chemical pulp and add wet strength agent to make wrinkled paper, which can replace hand towels for wiping in the kitchen. 4. Toilet paper: toilet paper that is moderately soft and easy to absorb water. The product can be divided into wrinkled toilet paper and patterned toilet paper according to the surface condition, and can be divided into roll type (including single layer and double layer) and flat type according to the structure shape. (Including folding and continuous extraction type), the so-called roll is a row of small holes parallel to the axis of the roll at regular intervals so that the paper can be easily torn off the paper roll.

5. Sanitary napkins: Generally composed of a covering body, an absorbent body and a leak-proof body. Its texture should be soft and neutral, without stains, impurities and pulp lumps, and its appearance should be free of peeling, fractures and holes.

◎Industrial paper product introduction: 1. Liner board.

6. Ask for a little tip about paper

Tell you in simple terms What are some tips for detecting paper!

Single sheet inspection

Take any piece of paper from the paper pile, touch the surface with your hand or look at the paper flatly, and check that the surface of the paper is smooth and even. The degree and degree of cleanliness. Generally speaking, the surface of the paper should be smooth, without traces and lumps. At the same time, the surface of the paper should not have spots with different colors, reflections, or colors that are inconsistent with the paper. Dust, etc.

Hold the paper up to the light and observe it to check the uniformity of the paper. When observing the paper, there should be no light or dark spots of varying degrees. If the paper has large areas of unevenness. Uniform cloud-like spots indicate poor uniformity of the paper, which will seriously affect the quality of the printed matter.

7. What are the basic common sense about paper

1. Our office. A4 paper is commonly used, and A4 paper is a standard size of paper formulated in my country based on the size of international paper. In this standard, A4 paper is the 16-page A series full paper.

The size is 210*297 mm.

2. What are the specifications of paper? Commonly used paper has two specifications: generous and positive.

3. What is generous paper? The specification is 889*1193 (mm).

4. What is the standard paper? The specification: 787*1092 (mm) is the normal paper.

Measurement.

A unit of measurement for paper, the ream or roll. Rolling the entire paper into a tube is called roll paper. Usually a roll is equivalent to about 10 reams, and a ream is usually 500 sheets of paper. The thickness of paper is measured in grams, which represents the weight of a piece of paper per square meter.

8. Please tell me some common sense and basic types of paper classification

Coated paper: divided into single-sided and double-sided coated coated paper, according to the Japanese Paper Industry Classification Standard The coating amount per side is about 10g/m2 or more, which is one of the most commonly used paper types in cultural publishing, advertising design, printing and binding, and industrial and commercial circles;

Lightly coated paper: coated with pigments and pressed It improves the uniformity and smoothness of the paper surface, and improves the ink holding capacity of the paper;

Daolin paper - a printing and writing paper made from chemical pulp, is currently the most popular in cultural publishing, printing and binding. One of the commonly used types of paper;

Bible paper - contains a large amount of titanium dioxide filler, has light weight and high opacity, and is specially used for printing Bibles, dictionaries or aviation expresses.

Differences:

Coated paper: smooth, bright, uniform ink absorption, good gloss, high opacity, after color printing, the pattern effect is bright and the color gradation is good, suitable for color Printed matter;

Dowling paper: The surface is not coated with slurry, and the gloss and smoothness are worse than coated paper;

Lightly coated paper: Low-quantity coating Paper, between coated paper and offset paper, its color printing effect is comparable to coated paper, and has good opacity and slipability. It has less durability, so it is more suitable for printing printed matter that does not need to be stored for a long time;

Bible paper: The paper is light and very thin, so thousands of pages of paper put together are only as thick as an average book. The paper is very smooth, smoother than ordinary paper and not rough.