The appearance of paper has caused great changes in the fields of economy, culture and social life. What is the purpose of paper?

Commonly known as white newspaper, it is characterized by softness and porosity, certain institutional strength and good absorbability, which can make the ink penetrate and fix in a short time and will not stick dirty when folded. It is used to print newspapers, periodicals and general books on high-speed rotating machines. The basis weight of newsprint is 5 1g/m2, and the width of rolled newsprint is 1572mm, 1562mm, 787mm and 781mm.. The width of lithographic paper is 787mm, w 1092. Newsprint is suitable for printing and opaque, but its whiteness is low and its surface smoothness is different. When printing pictures, use a thick screen, which is easy to turn yellow and brittle after sunlight, and should not be stored for a long time.

Cardboard for box making

Also known as hemp cardboard, it is a relatively strong cardboard for cartons, which is widely used for shipping books, department stores, radios, televisions, machine parts, food and so on. The quantities are 200g/m2, 3 10/0g/m2, 420g/m2 and 530g/m2. Smooth surface and good mechanical strength.

coated paper

Also known as coated paper, it is an advanced printing paper which is made by coating a layer of white paint made of calcium carbonate or white clay and adhesive on the base paper, drying and calendering. Because of its fineness and whiteness, high smoothness, good gloss and moderate oil absorption, it is suitable for copper plate printing or offset printing, printing color or monochrome pictorial, pictures, calendars, maps and books, and also packaging and printing paper. It is divided into single-sided coating and double-sided coating, and the two kinds are divided into special number, 1 No.,No.2 and No.3, and the quantitative is 80 g/m2 to 250 g/m2. Coated paper requires high coating strength, no powder loss, and can be suitable for fine screen printing above 60 lines /cm.

offset paper

Formerly known as "Dowling Paper", offset press is used for books and periodicals. Suitable for printing monochrome or multicolor book covers, characters, inserts, pictorial, maps, posters, color trademarks and various packaging products. Offset printing paper is divided into special number, 1 number and No.2, and the quantity varies from 70g/m2 to 150g/m2. Pulp has high strength and printability. Offset printing is a relatively advanced printing paper for books and periodicals, which requires high contrast, expansion and contraction ratio and surface strength, and the acidity and alkalinity should be close to neutral or weakly alkaline, so as not to affect the printing paper, and the basis weight is 40 g/m2 to 80 g/m2. In recent years, low-volume offset newsprint and offset book paper have been successfully trial-produced for offset book paper.

Letterpress/letterpress paper

Paper suitable for letterpress printing of various books, stationery and magazines. The basis weights are 52g/m2 and 60g/m2. There are two kinds of paper: roll paper and plain paper. Smoothness 30m, opacity not less than 88%. Letterpress printing paper is a widely used book paper, which is slightly smoother than newsprint and has a longer shelf life, but it is easy to lose hair and powder, so it is not suitable for offset printing books and periodicals. This kind of paper writes easily.

Straw board

Also known as yellow cardboard or horse manure paper, it is yellow packaging cardboard. Mainly used for the cover lining of commodity packaging, cartons and books. The ration is 200g/m2 to 860g/m2. Commonly used are No.8 420g, 10 530g, 12 640g. Straw cardboard requires dense and firm quality, smooth paper surface and certain mechanical strength and toughness.

White double-layer paperboard

Manila paper, also known as Manila paper, is a relatively high-grade white packaging paperboard. Used for printing educational pictures of children and trademarks of stationery, cosmetics and medicines. The ration is 200g/m2 to 400g/m2. Uniform thickness, no hair loss, no powder loss, tough, not easy to break when folding.

binding board

The important materials of book boxes are white cardboard and yellow cardboard, which are mainly used to make hardcover book boxes and envelopes. The hardcover bookcase with cardboard as the skeleton has the advantages of firmness, beauty and long-term preservation.

Calcium paper

The appearance is similar to that of paper, which is resistant to water immersion, does not absorb moisture, is not easy to burn, has high bursting resistance, tear resistance and low production cost. It is made of 160 degree strong rubbing and calendering, and its thickness is similar to that of cardboard. It can also be made into thick cardboard, which has certain penetration and absorption ability to ink and can print clear pictures and words. It can be used for printing books and cards, securities, labels and color printed matter, and can also be used for making corrugated boxes to transport food and goods that need moisture and oil protection.

kraft paper

It is a tough and waterproof wrapping paper, brown and widely used. It is often used to make paper bags, envelopes, record covers, documents and sandpaper. The quantitative range is 40 g/m2 to 120 g/m2, and there are differences between roll paper and plain paper, single side, double side and stripes. The main quality requirements are flexibility and firmness, high bursting resistance, and being able to withstand large tensile force and pressure without cracking.

cellophane paper

Also known as transparent paper, it is a high-grade packaging decorative paper as transparent as glass. Used for packaging food, shirts, cigarettes, cosmetics and other commodities. The ration is 30 grams/square meter. In addition to being transparent and colorless, there are many colors such as gold, pink and green. Cellophane is airtight, oily and watery, soft and tough, colorless, transparent and shiny. After sealing, it can be moisture-proof and rust-proof, but it will crack with a slight crack. Because of its great longitudinal strength, it can be used as a paper rope. Waste cellophane cannot be recycled.

Sealing paper

It is an extremely thin single-sided optical writing paper with a basis weight of only 20g/m2. Originally used mainly for stamps and insured letters. Now it is mostly used in cosmetics, fruit and food packaging and cigarette lining. After printing and waxing, it can be used as candy wrapping paper, and can also be used to print documents, subpoenas or multi-page copy paper instead of typing paper and copy paper. Quality requirements are thin and tough, good transparency, high tension and low air permeability.

China painting and calligraphy paper

It is paper written and painted with a brush, including meta-book paper, rice paper, wrinkled paper and so on. Yuanshu paper is made of bamboo, bark, rags, old hemp, straw and other plant fibers through soaking, cooking, natural bleaching and grinding. Hand-made paper on bamboo curtain, pressed and dried on fire wall, the paper is white (or yellowish), uniform and soft, easy to absorb ink and durable. Xuan paper is a kind of painting and calligraphy paper made of sandalwood bark and a small amount of straw pulp. Raw rice paper is suitable for freehand brushwork calligraphy, and cooked rice paper made of it is suitable for meticulous painting, white and flexible, durable and not easy to be eaten by insects. It is famous for its production in Xuancheng, Anhui. Fringed paper is a kind of writing paper with brush made of tender bamboo, and its color is light yellow and white. They are all made of bamboo curtains and used to print ancient books, rubbings, stationery and fans.

glazed paper

It is a single-sided glossy paper for writing, office and publicity slogans. It can also be used for pasting paper boxes, packaging goods, printing calendars, stationery and invoices. It has a wide range of uses and is a common household paper. It used to be called office paper or snow lotus paper. There are three special numbers, 1 and 2, and the quantitative range is from 18 g/m2 to 40 g/m2. The quality requires uniform thickness, smooth paper surface, light writing sizing and certain water resistance. Colored glossy paper, also called slogan paper, is mainly used to write slogans!

Tissue paper for copying

It is a kind of thin paper used for typing and copying, and is also used to print documents, bills or stationery at present. It is divided into three grades: special number, 1 number and No.2. The quantitative range is 24 g/m2 to 30 g/m2, and the ordinary type is 28 g/m2. It requires that the thickness of the paper should not exceed 0.05 mm, the thickness should be consistent, and multiple pages can be typed and copied at one time. The paper should be strong and smooth, and it should not be soaked when writing. Color printing paper is used to print multiple subpoenas or subpoenas.

writing paper

It is a large amount of cultural paper, suitable for writing forms, exercise sheets, bills, notebooks and so on. , the special number is 1.