What are the classifications of paper?

Commonly used paper classifications

Data source: China PHOTOSHOP Alliance

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Newsprint

Commonly known as white newspaper, it is characterized by being soft and porous, with a certain structural strength, good absorbency, and can keep ink in a very It penetrates and fixes 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 basis weight of newsprint is 51 grams per square meter, and the width of roll newsprint is 1572 mm, 1562 mm, 787 mm, and 781 mm; the format size of lithographic paper is 787 mm w1092 mm. Newsprint is adaptable to printing and opaque, but has low whiteness and different surface smoothness. A coarser mesh should be used when printing pictures. It will easily turn yellow and brittle after sunlight and is not suitable for long-term storage.

Crateboard

Also known as hemp cardboard, it is a relatively sturdy cardboard used in cartons. It is widely used for shipping books, department stores, radios, televisions, machine parts and food, etc. Basis basis is 200 g/m2, 310 g/m2, 420 g/m2 and 530 g/m2. Smooth surface and good mechanical strength.

Coated paper

Also known as coated paper, it is coated with a layer of white paint made of calcium carbonate or white clay and an adhesive on the base paper. It is dried and pressed High-grade printing paper made of light. Because it is delicate and white, has high smoothness and gloss, and has moderate oil absorption, it is suitable for copper plate printing or offset printing, printing color or monochrome pictorials, pictures, calendars, maps and books, and is also used for packaging and printing. It is divided into two types: single-sided coating and double-sided coating. The two types are divided into special numbers, No. 1, No. 2, and No. 3, with a quantitative range of 80 g/m2 to 250 g/m2. Coated paper requires high coating strength, no powder loss, and can be suitable for fine mesh printing of 60 lines/cm or more.

Offset paper

Oldly known as "Dowling paper", it is a paper for books and periodicals used in offset printing machines. Suitable for printing single-color or multi-color book covers, text, inserts, pictorials, maps, posters, color trademarks and various packaging materials. Offset printing paper is divided into special size, No. 1 and No. 2, with basis weight from 70 g/m2 to 150 g/m2. Pulp has high strength and printability. Offset printing is a relatively high-end printing paper for books and periodicals. It has high requirements on contrast, stretch 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 basis weight is 40 g/square. m to 80 g/m2. In recent years, we have successfully trial-produced low-quantity offset printing newsprint and offset printing book and periodical paper for use in offset printing paper and books and periodicals.

Letterpress paper

A kind of paper suitable for letterpress printing machines to print the text of various books, cultural and sports supplies and magazines. The basis weight is 52 g/m2 and 60 g/m2, available in roll paper and flat paper, with a smoothness of 30 meters and an opacity of not less than 88%. Letterpress printing paper is widely used for books and periodicals. It is slightly smoother than newsprint and has a longer shelf life. However, it is prone to lint and powder loss and is not suitable for printing books and periodicals using offset printing. This kind of paper bleeds easily when writing on it.

Straw cardboard

Also known as yellow cardboard or horse manure paper, it is yellow packaging cardboard. It is mainly used for the packaging of goods, the cover lining of paper boxes and book boxes. Basis basis is 200 g/m2 to 860 g/m2. The commonly used ones are No. 8 420 grams, No. 10 530 grams, and No. 12 640 grams. Strawboard requires tight and solid quality, smooth paper surface, and certain mechanical strength and toughness.

White cardboard

Also known as manila paper, it is a white, relatively high-end packaging cardboard. It is used to print children's educational pictures and trademarks for stationery, cosmetics, and medicines. Basis basis is 200 g/m2 to 400 g/m2. The thickness is consistent, lint-free, powder-free, tough, and not easy to break when folded.

Binding cardboard

The important materials for book box packaging 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 being strong, beautiful and conducive to long-term storage.

Calcium paper

It is very similar to paper in appearance, can withstand water immersion, is not hygroscopic, is not easy to burn, has high burst resistance and tear resistance, and has low production cost. . It is made by strong kneading and calendering at 160 degrees. Its thickness is similar to that of cardboard. It can also be made into thicker cardboard. It has a certain ability to penetrate and absorb ink and can print clear pictures and text. It can be used to print book cards, securities, labels and color prints, and can also be used to make corrugated cardboard boxes for shipping food and goods that need to be moisture-proof and oil-resistant.

Kraft paper

It is a tough and water-resistant packaging paper with a brown color and a wide range of uses. It is often used to make paper bags, envelopes, record sleeves, files and sandpaper. The basis weight range is from 40 g/m2 to 120 g/m2. There are roll paper and flat paper, single-sided light, double-sided light and striped paper. The main quality requirements are that it is flexible and strong, has high burst resistance, and can withstand large tensile forces and pressures without breaking.

Cellophane

Also known as transparent paper, it is a high-grade packaging and decorative paper that is as transparent as glass. It is used to wrap grains, fruits, food, shirts, cigarettes, cosmetics and other commodities. The basis weight is 30 g/m2. In addition to being transparent and colorless, there are also many colors such as golden, pink, emerald green and so on. 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 greater longitudinal strength, it can be made into paper ropes. Waste cellophane cannot be recycled.

Postal cover paper

It is an extremely thin single-sided smooth writing paper with a basis weight of only 20 grams per square meter. It was originally mainly used for stamp backing paper and insured letters. Paper for sealing. Now it is mostly used in cosmetics, fruit and food packaging and cigarette linings. After printing and waxing, it can be used as candy wrapping paper, or it can replace typing paper and copy paper to print documents, subpoenas or multi-page carbon paper. The quality requirements are thin and strong, with good transparency, high tension and low air permeability.

Paper for Chinese calligraphy and painting

It is paper used for writing and painting with brushes, including Yuan calligraphy paper, rice paper, rough edge paper, etc. Yuan Shu paper is made from plant fibers such as bamboo, bark, rags, old hemp and straw. It is soaked, steamed, naturally bleached and ground to make pulp. It is then manually copied into paper on bamboo curtains and pressed dry. It is then pasted on a fire wall and dried. The resulting paper is white (or slightly yellow) in color, uniform and soft, easy to absorb ink, and durable. Rice paper is a paper for calligraphy and painting made with sandalwood bark and a small amount of straw pulp as raw materials. Raw rice paper is suitable for freehand painting and calligraphy. The cooked rice paper processed from it is suitable for fine brushwork. The color is white and flexible, durable and difficult to change. Insect-eaten. It is famous for its origin in Xuancheng area of ??Anhui Province. Raw edge paper is a writing paper made of young bamboo. It is light yellow in color, while historical paper is white in color. Both are made of bamboo curtains and are used for printing ancient books, inscriptions, letterheads, fans and other products.

Glossy paper

It is a single-sided glossy paper used for writing, office work and promotional slogans. It can also be used for pasting paper boxes, packaging goods, printing calendars, letterheads and invoices, etc. It has a wide range of uses and is a commonly used tissue paper. It used to be called office paper or snow lotus paper. There are three types: special number, No. 1 and No. 2, with quantitative quantities ranging from 18 g/m2 to 40 g/m2. Quality requirements include uniform thickness, smooth paper surface, light sizing for easy writing, and certain water resistance. Colored glossy paper is also called slogan paper and is mainly used for writing slogans!

Typing paper

It is a thin paper used for typing and copying. It is also used to print documents, tickets or letterheads. It is divided into three grades: Special No., No. 1 and No. 2, with a quantitative range of 24 g/m2 to 30 g/m2, and the commonly used one is 28 g/m2. It requires that the thickness of the paper should not exceed 0.05 mm, that it should be consistent in thickness, that it can be typed and copied on multiple pages at once, that the paper should be strong and flat, and that it will not bleed when writing. Colored typing paper is used for printing multi-part summons or tickets.

Writing paper

It is a kind of cultural paper that is widely consumed. It is suitable for forms, exercise sheets, account sheets, record books, etc. for writing. It is divided into special numbers, There are five grades: No. 1, No. 2, No. 3 and No. 4, with a basis weight of 45 g/m2 to 80 g/m2.

Quality requirements: white color, smooth on both sides, tight texture, and no water smearing when writing.

Gravure paper

Paper used for printing various color prints, periodicals, comics, picture albums, stamps and securities.

Its specifications and sizes are basically the same as newsprint, letterpress paper and offset paper. It is also divided into two types: web paper and flat paper. Gravure paper printing requires high smoothness and shrinkage. The paper should have high whiteness and 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 with a thick coating amount (20 to 39 grams per side) on the base paper twice or once. When the paint is in a wet state, the coated surface is heated and dried close to a highly polished chrome-plated drying cylinder. It can be obtained at a speed of about 100 meters or lower, the gloss is about 85, and no calendering is required. The coated paper is embossed with a pattern roller to make cloth paper or chicken skin paper. Cast-coated paper is mainly used to print covers, inserts and high-end cartons, while textured paper and chicken skin paper are mostly used to print wall calendars and business cards.

Matt pink paper

The official name is matte coated paper. When viewed under sunlight, it is less reflective than coated paper.