Classification according to length and width:

A4 specification: 21*29.7 cm, B4 specification: 25*35.4, B5 specification: 18.2*25.7

The specifications of paper refer to the fact that after the paper is made, it is trimmed and trimmed to a certain size. In the past, the size of the paper was represented by how many "opens" (such as 8 karat or 16 karat, etc.), but now I adopt international standards, which stipulate that the paper is represented by marks such as A0, A1, A2, B1, B2, etc. format specifications. The standard stipulates that the proportional relationship between the width of the paper (represented by X) and the length (represented by Y) is X:Y=1:n.

According to the basic area of ??the paper format, the format specifications are divided into A series, B series and C series. The format specification of A0 is 841mm×1189mm, the format area is 1 square meter; the format of B0 The size is 1000mm×1414mm, the format area is 2.5 square meters; the format size of C0 is 917mm×1279mm, the format area is 2.25 square meters; the format specifications of copy paper only use A series and B series. If A0 paper is cut into two equal lengths, it will become A1 size. If A1 paper is cut in half along the length direction, it will become A2 size. Then it will be cut into A8 size. B8 paper will also be cut into B8 size in the same way. Specification. The format sizes of A0~A8 and B0~B8 are listed in the table below. Among them, 7 format specifications, including A3, A4, A5, A6 and B4, B5 and B6, are commonly used specifications for copy paper.

For example: "A4" paper is to fold the A-type basic size paper 4 times, so the area of ??an A4 paper is one-fourth of 2 to the power of 2 of the basic paper area, that is, 1 /16. The rest can be deduced in this way.

Generally, printing paper uses copy paper. Copy paper is classified according to size. There are several standards: 1. Type A; 2. Type B; 3. Type K. Type K paper is ours. The commonly referred to open-type paper, K-type paper is only available in China. Nowadays, A-type paper is generally used. Regardless of type A or type B, its classification is the same. For example, A5 is twice the size of A6, A4 is twice the size of A5, A3 is twice the size of A4, B4 is twice the size of B5, B3 is twice the size of B4, and K-type classification is to divide a large 1K paper into two pieces as 2K, divide the 2K paper into half as 4K, divide the 4K paper into half as 8K, divide 8K into half as 16K, and divide 16K into Half would be 32K etc.

There is also special printing paper for office use. The classification is based on the size and number of layers of the paper, such as 241-1 and 241-2, which represent 1-layer and 2-layer narrow-line printing paper respectively. , of course, there are also 3 layers and 4 layers; commonly used wide line printing papers include 381-1, 381-2, etc.

It is also divided according to the thickness of the paper, such as 60g, 70g, 75g, 85g, 120g, etc., which refers to the weight of the paper per unit area, because the density of the paper is basically the same , the heavier the weight of the paper per unit area, the thicker the thickness of the paper. For example, general speed printing machines use about 40g paper, while all-in-one machines use 50-60g paper, and copiers use 70-85g paper. Printers generally do not use paper thicker than 60g. Otherwise, paper jams may occur easily.

Paper is classified according to use and quality (Mainland Classification)

Usually divided into six categories according to use: printing paper and cardboard; writing, drawing and copying paper and cardboard ; Packaging paper and cardboard; household, sanitary and decorative paper and cardboard; technical paper and cardboard; processed paper base paper.

Printing paper and cardboard

1. Coated printing paper and cardboard

There are offset printing coated paper, offset printing coated base paper, and coated stamps Paper, coated stamp base paper, coated white board, low basis weight offset printing coated paper, embossed offset printing coated paper, cast coated paper, cast coated paper base paper, cast coated white board, cast white board base paper, matt Printing coated paper, coated cardboard, coated boxboard, low-quantity gravure printing coated paper.

2. Non-coated printing paper and cardboard

Including newsprint, dictionary paper, map paper, nautical chart paper, offset book and periodical paper, letterpress printing paper, primary and secondary school textbook paper, offset printing paper Printing paper, single-sided offset printing paper, book cover paper, poster paper, white cardboard, rice card paper, gravure printing paper, bond paper, stamp paper, political paper, Braille printing paper, playing card surface paper, weekly newspaper, thin letterpress Paper, single-sided book cover paper, postcard paper, banknote paper, train ticket paper, ticket paper, cover paper, envelope paper.

Culture, art, daily paper and cardboard

1. Writing paper

Including typing paper, drawing paper, rice paper, writing paper, and single-sided writing paper Paper (glossy paper), drawing paper, watercolor paper, sketch paper, charcoal paper, double red paper, striped writing paper, account paper, rough edge paper, history paper, leather paper, water writing paper, oil painting blank paper , blotting paper, plum red paper.

2. Copy paper

There are tracing paper, stylus stencil base paper, dry electrostatic copy paper, printing base paper, dry diazo photosensitive paper, carbon copy paper, typing copy paper, and Carbon copy paper, low-image base paper, electrostatic copy tracing paper, typing wax paper base paper, transcription paper, typing wax paper backing paper, thermal copy paper, electrostatic plate making paper, carbonless copy paper.

3. Toilet paper

There are sanitary napkins, wrinkled toilet paper, diaper paper, thin non-woven fabrics, rodent-killing paper, plaster paper, cotton paper, water-soluble medicinal paper, and paper towels paper, wet wipes paper.

4. Household paper

There are shoemaking cardboard, woven base paper, paper insoles, black photographic cardboard, tablecloth paper, cloth substitute paper, kitchen paper, powdered paper, Lens paper, petticoat paper.

5. Decorative paper

There are decal paper, decal lining paper, wax paper, decorative base paper, wax base paper, wallpaper base paper, plastic-coated wallpaper, wrinkled base paper, Dry collagen paper, plastic veneer paperboard, gypsum paperboard, bottom paper, surface paper, ceramic film decal paper, ceramic film decal liner, metal decal paper, metal decal liner, enamel decal paper,

Packaging Paper and cardboard

1. General packaging paper

There are paper bag paper, kraft paper, egg paper, aluminum foil lining paper, pin paper, translucent paper, striped kraft paper, and film protection base paper. , match paper, neutral wrapping paper, stretch paper bag paper, thin wrapping paper, ordinary wrapping paper, striped wrapping paper, agricultural wrapping paper, soap wrapping paper, wrinkled tire wrapping paper, paddle residue wrapping paper, aluminum wrapping paper, Packaging base paper, Velen cloth paper composite packaging materials, recycled kraft paper, recycled cement bag paper, waterproof bag paper, phosphate fertilizer bag paper, recycled wrinkle sealing bag paper, packaging paper, kraft paper, gray lining paper, blue sandpaper, composite Crepe base paper, machine-made white paper, more hollow aluminized base paper, vacuum aluminized paper, film lining paper.

2. Special packaging paper

There are industrial parchment paper, extra fine parchment paper, industrial parchment base paper, extra fine parchment paper, neutral paraffin paper, neutral paraffin base paper, cellophane, Striped asphalt base paper, striped asphalt paper, asphalt moisture-proof base paper, vapor phase moisture-proof paper, vapor phase rust-proof base paper, black opaque paper, sodium benzoate rust-proof paper, neutral plastic wax moisture-proof packaging paper, line-lined tar paper.

3. Food packaging paper

There are food parchment paper, food parchment base paper, candy packaging base paper, popsicle wrapping paper, imitation parchment paper, ordinary food wrapping paper, greaseproof paper, liquid food Composite materials for packaging, extruded candy wrapping paper, oxygen-insulating composite packaging materials for pastry preservation, oxygen scavenger bag paper for pastry preservation.

4. Packaging cardboard

There are single-sided white cardboard, thick cardboard, yellow cardboard, neutral cardboard, box cardboard, kraft cardboard, corrugated base paper, standard cardboard, suitcase cardboard, tea Cardboard paper, match outer box cardboard, match inner box cardboard, double-sided gray cardboard, green gray cardboard.

Technical paper and cardboard

1. Paper and cardboard for testing and information recording

Information processing unperforated paper tape, perforated telegraph newspaper, electronic Computer continuous recording format base paper, industrial automation instrument recording paper, electrocardiogram paper, information processing continuous format paper, single-page teletype paper, punched cardboard, wet sonar recording paper, electric spark recording base paper, red translucency Sensitive recording paper, white translucent force-sensitive recording paper.

Deep well water-resistant recording paper, thermal fax paper, deep well polyester cardboard, deep well pressure recording paper, electroencephalogram paper, low-voltage electrosensitive paper, oscilloscope recording paper, electroacoustic paper, force-sensing recording paper, meteorological recording paper, Calibration instrument ink ribbon paper, thermal recording paper, electrocardiogram base paper, spark fax paper, spark shadow fax paper, pH test paper base paper, hydrogen sulfide analysis paper, carbon paper, wet electrochemical recording paper, acoustic core paper, instrument record Original paper, potassium chloride recording paper, punched recording paper, electrostatic aunt paper.

2. Paper and paperboard for filtration

There are quantitative filter paper, qualitative filter paper, filter paperboard, non-heat-sealing tea filter paper, chromatographic analysis filter paper, industrial filter paper, oil filter paper base paper, J-140 oil filter paper, WJ-140 oil filter paper, J-85 oil filter paper, 5um fine diesel filter paper, C-170 diesel filter paper, diesel filter paper base paper, oil filter paper, WC-150 fuel filter paper, HM-180 aviation filter paper, J- 180 cotton rubber filter paper, M-150 cotton rubber filter paper, unsoaked 530 filter paper, heat-sealed tea filter paper, K-120 air filter paper, K-280 air filter paper, K-80 air filter paper, No. 1 filter paper, No. 2 filter paper, 1 No. 2 microfiltration paper, No. 3 microfiltration paper, No. 01 air filter paper, No. 02 air filter paper, No. 03 air filter paper, No. 04 air filter paper, No. 05 air filter paper, S-06 air filter paper, desert air filter paper, MH-530 filter paper, 1.5 cotton machine filter paper, C-180 gold cotton diesel filter paper, NC-220 filter paper, wrinkled 220 filter paper, beer filter paper, sterilizing filter paper, glass fiber filter paper, milk filter paper, Water purification paper, cancer cell filter paper, precision grinder filter paper, hydraulic oil filter paper, activated carbon filter paper, special activated carbon filter paper for radioactive gas determination, synthetic fiber filter paper, non-corrugated WG-59 filter paper, oil and gas separation filter paper, gap filter paper , filter paper for smoke meter, lead smoke filter paper, high temperature resistant air filter paper, ion exchange resin filled filter paper, cation exchange fiber filter paper, uncoated sterilizing asbestos filter plate, coated sterilizing liquid filter plate, uncoated sterilizing liquid filter plate Coated sterilizing liquid filter plate, SI wrinkled filter paper, high-efficiency filter corrugated base paper, type 69 gas mask filter paper, type 69 purifying air filter paper, type 49 purifying air filter paper, 0.1um high-efficiency air filter paper, tea packaging paper , three filter papers.

3. Paper and cardboard for electrical insulation

Including impregnated insulating paper, power cable paper, communication cable paper, semiconductor cable paper, telephone paper, electrical insulating cardboard, and rolled insulating paper , electrolytic capacitor paper, capacitor paper, wrinkled cable paper, polyester composite insulating paper, double-layer double-density dry electrolytic capacitor paper, 110~330kV high-voltage cable paper, 500kV ultra-high-voltage cable paper, porcelain capacitor professional cardboard, battery separator paper , H-class electrical insulating paper, battery separator base paper, self-extinguishing impregnated insulating paper, 50kV electrical inter-turn insulating paper, 50kV oil-paper bushing insulating paper, insulating crepe paper, unimpregnated liner cardboard.

4. Paper and cardboard used in supporting industrial and agricultural production

Including red electro-optical cannon paper, cotton sliver tube steel cardboard, filter rod paper, cartridge paper, fuse paper, sand and gravel raw materials Paper, dynamite cigarettes, hard steel cardboard, soft steel cardboard, steel paper tubes, steel paper base paper, linoleum base paper, (hemp) cigarette paper, silkworm paper, jacquard cardboard, accordion box cardboard, asphalt waterproof cardboard, plastic model paper, Gold heat-pressed copy paper, silver heat-pressed paper, record heat-pressed paper, cigar paper, cork base paper, cork paper, cigar base paper, cloth paper, metallographic sandpaper, water-resistant sandpaper base paper, clock face paper, adhesive Paper, absorbent paper, lacquered paper base paper, wine bottle mouth sealing liner paper, rice seedling transplanting paper, sugar beet seedling paper, onion skin paper, seedling base paper, black heat-pressed paper, PVC heat sealing paper, battery absorbent paper, Parchment paper, 501 perforated black tape paper, photosensitive film backing paper, woolen professional paper, wax stem match paper, abrasive base paper.

5. Other technical papers

Including dental engagement paper, blood collection test paper, gastric cancer test paper, fracture fixation clipboard, flame retardant paper, carbon-filled insulation paper, water-soluble paper , quick-burning paper, bacterial culture paper, high-temperature-resistant insulation paper, font cardboard.

Mechanical paper

1. Printing paper includes newsprint, letterpress printing paper, offset paper, gravure printing paper, coated paper, book cover paper, poster paper, etc.

2. Writing paper includes writing paper, glossy paper, typing paper, etc.

3. Drawing and drawing paper include tracing paper, drawing paper and drawing paper.

4. Electrical insulating paper includes capacitor paper, telephone paper, cable paper, insulating paper, etc.

5. Cigarette paper including cigarette paper, cigarette holder paper, etc.

6. Absorbent paper includes blotting paper, filter paper, steel paper base paper, parchment paper, etc.

7. Instrument paper includes typewriter tape, roll telegraph paper, punched card stock, etc.

8. Photosensitive paper includes photographic base paper, photosensitive base paper, etc.

9. Transfer paper base paper includes copying base paper, typing wax paper base paper, etc.

10. Industrial technical paper includes jacquard paper, sandpaper base paper, paper rope paper, moisture-proof base paper, corrugated base paper, etc.

11. Wrapping paper includes kraft packaging paper, straw pulp packaging paper, wood pulp packaging paper, waste paper packaging paper, reed pulp packaging paper, miscellaneous pulp packaging paper, plant parchment paper, imitation parchment paper, paper Box paper, match paper, paper bag paper, etc.

Cardboard

1. Binding cardboard includes gray waste cardboard, binding box cardboard, etc.

2. Box cardboard includes straw cardboard, white cardboard, corrugated cardboard, box cardboard, etc.

3. Electrical insulating cardboard includes electrical insulating cardboard, lightning cardboard, etc.

4. Paper plates for industrial technology include ticket cardboard, kraft cardboard, jacquard cardboard, stencil cardboard, etc.

5. Construction cardboard includes roof cardboard, wall cardboard, linoleum base paper, etc.

6. Shoemaking cardboard includes heel cardboard, rag leather insole cardboard, etc.

But I don’t know the specific use of paper you are talking about!