Printing paper refers to a kind of paper used for printing documents and copying documents. The specifications are A0, A1, A2, B1, B2, A4, A5, etc. The commonly used A4 paper is widely used in examination papers.
Sort by length and width
The specification of paper refers to that after the paper is made, it is trimmed and trimmed to a certain size. In the past, the paper size was represented by the number of "open" (such as 8 open or 16 open). China adopts international standards, which stipulate that A0, A1, A2, B1, B2, A4, A5 and other marks are used to represent the paper format. The standard specifies that the proportional relationship between width (represented by X) and length (represented by Y) of paper is X: Y=1: n.
According to the basic area of the paper format, the format is divided into A series, B series and C series. The format of A0 is 841mm × 1189mm, covering an area of 1m2; The size of B0 is 1000mm × 1414mm, covering an area of 2 ^ 0.5m2; The size of C0 is 917mm × 1279mm, covering an area of 2 ^ 0.25m2; The format specification of copy paper only adopts A series and B series. If A0 paper is split in half along the length, it becomes A1 specification; if A1 paper is split along the length direction, it becomes A2 specification, so it reaches A8 specification; B8 paper is also opened to B8 specification in this way. The sizes of A0~A8 and B0~B8 are listed in the following table. Among them, 7 formats, including A3, A4, A5, A6 and B4, B5, B6, are commonly used for copy paper.
For example, "A4" paper is to fold the paper of type A basic size four times, so the area of a piece of A4 paper is one fourth power of the basic paper area, that is, 1/16. The rest can be deduced by analogy.
There is also a kind of K-type paper, which is often called open type paper. Only in China can K-type paper be used. Generally, A-type paper is used. Regardless of type A and type B, the classification is the same. For example, A5 is twice as big as A6, A4 is twice as big as A5, A3 is twice as big as A4, B4 is twice as big as B5, B3 is twice as big as B4. Type K is classified as 2K by dividing a large 1K paper into two pieces, 4K by dividing a 2K paper into half, 8K by dividing a 4K paper into half, 16K by dividing a 16K paper into half, 32K by dividing a 16K paper into half, etc.
Other paper newsprint
Commonly known as white newspaper, it is characterized by its soft and porous structure, certain strength and good absorption, which can make the ink penetrate and fix in a short time, and will not stick when folded. It is used for printing newspapers, periodicals and general books on high-speed rotary machines. The ration of newsprint is 51g/m2, and the width of newsprint roll is 1572mm, 1562mm, 787mm and 781mm; The paper size is 787mm * 1092mm. Newsprint is suitable for printing. It is opaque, but its whiteness is low, and its surface smoothness is different. When printing pictures, it should use a thick mesh. It is easy to become yellow and brittle after sunlight, so it is not suitable for long-term storage.
Containerboard
Also known as hemp cardboard, it is the cardboard used for relatively strong cartons, widely used for shipping books, department stores, radios, televisions, machine parts and food. The ration is 200g/m2, 310g/m2, 420g/m2 and 530g/m2. The surface is flat and the mechanical strength is good.
Copper plate paper
Also known as coated paper, it is a high-quality printing paper that is coated with a layer of white paint composed of calcium carbonate or white clay and adhesive, dried and calendered. Due to its delicate white, high smoothness and glossiness, and moderate oil absorption, it is suitable for copper plate printing or offset printing. It is also used for printing colorful or monochrome pictorials, pictures, calendars, maps and books. It is divided into single-sided coating and double-sided coating, and the two are divided into special size, No. 1, No. 2 and No. 3, with the quantitative range of 80g/m2 to 250g/m2. Copper sheet paper requires high coating strength, no powder dropping, and can be suitable for fine screen printing of more than 60 lines/cm.
Offset paper
Formerly known as "Daolin Paper", it is used for books and periodicals by offset printing machines. It is suitable for printing monochrome or multi-color book covers, text, inserts, pictorials, maps, posters, color trademarks and various packaging materials. Offset printing paper is divided into special, No. 1 and No. 2, and the quantitative range is from 70g/m2 to 150g/m2. The pulp has high strength and printability. Offset printing is a relatively advanced book printing paper. There are high requirements for contrast, expansion rate and surface strength. The acidity and alkalinity should also be close to neutral or weakly alkaline, so as not to affect the paper used for printing. The ration is 40g/m2 to 80g/m2.
Letterpress paper
The utility model relates to a paper which is suitable for printing various books, stationery and magazine texts by a relief printing machine. The fixed weight is 52g/m2 and 60/m2. There are two kinds of web paper and flat paper. The smoothness is 30m and the opacity is not less than 88%. The letterpress printing paper is widely used for books and periodicals. It is slightly smoother than newsprint and has a longer shelf life, but is prone to hair and powder loss, so it is not suitable for offset printing. This kind of paper is easy to soak when writing.
Straw paperboard
Also known as yellow cardboard or manure paper, it is yellow packaging cardboard. It is mainly used for the packaging of goods, the cover lining of paper boxes and bookcase books. The ration is 200g/m2 to 860g/m2. The commonly used ones are 420g for No. 8, 530g for No. 10 and 640g for No. 12. Straw paperboard shall be compact, solid, flat and have certain mechanical strength and toughness.
White cardboard
Also known as manila paper, it is a white high-grade packaging board. It is used to print children's educational pictures and trademarks of stationery, cosmetics and medicines. The ration is 200g/m2 to 400g/m2. The thickness is consistent, no fuzzing, no powder falling, tenacity, folding is not easy to break.
Bound paperboard
The important materials for bookcase packing include white cardboard, yellow cardboard, etc., which are mainly used to make hardcover book cases and envelopes. The hardcover book case with cardboard as the skeleton has the advantages of firmness, beauty and long-term preservation.
Calcium plastic paper
It is similar to paper in appearance, resistant to water immersion, non hygroscopic, not easy to burn, with high bursting strength and tear resistance, and low production cost. It is kneaded and calendered at 160 degrees. Its thickness is similar to that of paperboard. It can also be made into thicker paperboard. It has a certain penetration and absorption ability to ink and can print clear pictures and words. It can be used for printing books, cards, securities, labels and color prints, and can also be used to make corrugated cardboard boxes for shipping food and goods that need moisture and oil resistance.
Kraft paper
It is a tough and water resistant packaging paper, brown in color, widely used for making paper bags, envelopes, record covers, files and sandpaper. The quantitative range is from 40g/m2 to 120g/m2. There are differences between web paper and flat paper, single side light, double side light and striped light. The main quality requirements are flexibility, firmness, high burst resistance, ability to withstand large tension and pressure without cracking.
cellophane
Also known as transparent paper, it is a high-grade packaging and decorative paper as transparent as glass. It is used to package grain and fruit, food, shirts, cigarettes, cosmetics and other commodities. The ration is 30g/m2. In addition to transparent and colorless, there are many colors such as golden yellow, peach red and emerald green. The cellophane is impermeable to air, oil and water, soft and strong, colorless, transparent and shiny. It can be moisture-proof and rust proof after sealing, but it will crack if there is a slight crack. Because of its large longitudinal strength, it can produce paper rope. Waste cellophane cannot be recycled.
Postal paper
It is an extremely thin single-sided light writing paper, with a ration of only 20g/m2. It was originally mainly used for the sealing of stamp backing paper and insured letters. It is mainly used for the packaging of cosmetics, fruits and food and the lining of cigarettes. After printing and waxing, it can be used as candy wrapping paper, or it can replace typing paper and copy paper to print receipts, vouchers or multi page carbon paper. The quality requirements are thin, strong, transparent, high tension and low permeability.
Chinese painting paper
It is the paper for writing and painting with a brush, including yuan shu paper, rice paper, and rough edge paper. Yuanshu paper is made of bamboo, bark, rags, old hemp, straw and other plant fibers through soaking, steaming, natural bleaching and grinding to make paper pulp. It is manually made on the bamboo curtain, pressed and dried on the fire wall. The paper is white (or yellowish) in color, uniform and soft, easy to absorb ink, and will last for a long time. Rice paper is a kind of painting and calligraphy paper made from sandalwood bark and a small amount of straw pulp. Raw rice paper is suitable for freehand brushwork and calligraphy, and the cooked rice paper made from it is suitable for fine brushwork painting. Its color is white, soft, and durable, and it is not easy to be eaten by insects. It is famous for its origin in Xuancheng, Anhui. Maobian paper is a kind of brush writing paper made of tender bamboo. It is light yellow in color and the history paper is white in color. Both of them are made from bamboo curtains and are used to print ancient books, tablet posters, letter paper, fans and other products.
Glossy paper
It is a single-sided glossy paper for writing, office and advertising slogans. It can also be used for pasting paper boxes, packaging goods, printing calendars, letterhead and invoices, etc. It is a kind of commonly used thin paper with a wide range of uses. It used to be called office paper or snow lotus paper. It is divided into three types, namely, special number, No. 1 and No. 2, and the quantitative value ranges from 18 g/m2 to 40 g/m2. The quality is required to be uniform in thickness, flat in surface, slightly sized for easy writing, and with certain water resistance. Colored glossy paper, also known as slogan paper, is mainly used for writing slogans.
Typewriting paper
It is a thin paper for typing and copying, used to print documents, tickets or letterhead. It is divided into three grades, namely, special grade, No. 1 and No. 2, with the ration of 24g/m2 to 30g/m2, and 28g/m2 is commonly used. It requires that the thickness of the paper should not exceed 0.05 mm, and the thickness should be consistent. The paper can be typed at one time, copied multiple pages, and the paper should be strong, flexible and flat. When writing, the nonferrous colored typing paper is used for printing multiple vouchers or tickets.
Writing paper
It is a kind of cultural paper with large consumption, suitable for forms, exercise purses, account purses, record books, etc., for writing, divided into special number, number 1, number 2, number 3 and number 4, and the quantitative amount is 45g/m2 to 80g/m2. Quality requirements: the color is white, the two sides are smooth, the texture is tight, and the writing is not imbued with water.
Gravure paper
Paper used for printing various color prints, periodicals, comics, picture albums, stamps and securities. Its specifications and dimensions are basically the same as those of newsprint, relief paper and offset paper, and there are also two kinds of roll barrel paper and flat paper. Gravure printing requires high smoothness and retraction, high whiteness, good smoothness and softness.
Cast coated paper
Also known as glass powder paper, it is a high-grade coated printing paper with a particularly smooth surface. It is coated on the base paper with two or one thick coating amount (20 to 39 grams on one side). When the coating is wet, the coating surface is heated and dried closely on the highly polished chrome plating dryer at a speed of about 100 meters or less. The glossiness is about 85, and it does not need to be calendered. The coated paper can be made into cloth paper or chicken skin paper by embossing with a pattern roller. Cast coated paper is mainly used for printing covers, inserts and high-grade paper boxes, while cloth paper and chicken skin paper are mainly used for printing calendars and business cards.
Matt paper
The official name is matte copper sheet paper, which is less reflective than copper sheet paper when viewed in daylight. The patterns printed with it are not as colorful as copper plate paper.
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