What are the specific contents of A paper, B paper, and C paper, and how to distinguish them

A paper, B paper, and C paper are all paper size specifications, of which the size of A paper is 841mm 1189mm, the size of B paper is 1000mm 1414mm, and the size of C paper is 917mm 1279mm. These dimensions are defined on the basis of a 1:2 aspect ratio, which is one of the important parameters of paper size.

Based on these sizes, it is possible to distinguish A, B, and C papers. A paper is one of the most commonly used paper sizes, and is often used to make documents such as books, magazines, reports, etc.; B paper is relatively small and is often used to make leaflets, posters, etc.; C paper is a medium paper size that is commonly used to make envelopes, cards, business cards, etc.

Corrugated base paper is one of the important components of corrugated cardboard. Corrugated base paper requires good fiber bonding strength, smooth paper surface, good tightness and stiffness, and a certain elasticity to ensure that the made carton has shockproof and pressure resistance. In addition, the moisture index should be controlled, the moisture is too small, the paper is brittle, and the corrugated will crack during processing; If the moisture is too large and the paper is soft, it will bring difficulties to the processing and molding.

The moisture content of paper in general.

It should be controlled at about 10. Domestic corrugated base paper is divided into four grades: A, B, C, and D.

What are K paper, A paper, B paper, and C paper, and how to distinguish them? And their grams?

Corrugated boxes. Commonly used technical terms (similar to k=a, a=c, b=c) cardboard is composed of face paper, fluted pattern, mob paper, and bottom paper.

Commonly used face paper and liner paper are as follows:

K paper, the basis weight is 200g, the United States imports 240g, and even 300ga paper, the base weight is 160g

B paper, basis weight 120g

Take the A series of paper as an example: A0 is fully open, A1 is open, A2 is four-open, ......and so on

A series of openings are international standard openings, such as: A0 is a full piece of paper, and the result of its 16 openings is A4 (210mm*297mm), corresponding:

There are China's domestic commonly used paper openings, such as 787mm*1092mm is the whole paper, and its 16 openings are 185mm*260mm

According to the size of the folio, there are usually three types: large folio, medium folio, and small folio. In the case of 787 1092 paper, more than 12 folios are large folios, 16 36 folios are medium-sized folios, and less than 40 folios are small folios, but books with mainly text are generally medium-sized folios.

Except for 6 open, 12 open, 20 open, 24 open, and 40 open about a square, the rest are rectangles with different proportions, which are suitable for all kinds of books with different properties and uses.

Positive paper: 787 1092mm

Number of openings (positive) size unit (mm).

2 open 540 780

3 open 360 780

4 open 390 543

6 open 360 390

8 open 270 390

16 open 195 270

32 open 195 135

64 open 135 95

Note: Finished product size = paper size trimming size.

Generous paper: 889 1194mm

The number of openings (large simple tremors) size unit (mm) is a hidden defeat.

2 open 590 880

3 open 395 880

4 open 440 590

6 open 395 440

8 open 295 440

16 open 220 295

32 open 220 145

64 open 110 145

Note: Finished product size = paper size trimming size.

The size of the finished print.

Generous 2 open 870 570

3 open 390 870 420 580

4 open 420 580 290 870

8 open 420 285 210 570

16 open 210 285

32 open 210 140 105 285

48folio 95 210

48 open 92 210

Positive 2 open 760 520

3 open 350 760 360 680

4 open 370 520 260 760

8 open 185 520 370 260

16 open 185 260

32 open 185 130 92 260

48 folio 86 185

48 open 83 185

There are two kinds of paper: international standards and domestic standards, the international standard is the generous paper selling handweight also known as class A paper, and the domestic standard is positive paper also known as class B paper. The size of the whole sheet of the large paper is 1194*889mm, and the size of the whole sheet of the positive paper is 1092*787mm.

"International standards" refers to the standards developed by the International Organization for Standardization (ISO), the International Electrotechnical Commission (IEC) and the International Telecommunication Union (ITU), as well as the standards developed by other international organizations confirmed and published by the International Standards Organization.

In 1965, the national standard stipulates that the opening of books and magazines should be divided into three groups: A, B, and C, and Group A is cut from the original whole sheet of paper of 880 mm and 1230 mm, Group B of the original paper is 787 mm and 1092 mm, and Group C of the original paper is 695 mm and 960 mm. In 1982, GB788-87 emphasized the adoption of international standards, which is currently being promoted. The new standard retains the A series that conforms to the international standard in the old standard, and at the same time adopts the international standard B series, and eliminates the B and C groups in the original standard.

Its purpose is to promote foreign and international exchanges. What we call A4 and B5 when we make copies is an international standard.

c=(++a,b++,a++,b);

The comma operator is taken from left to right, taking the value of the last expression ++a after a is 11, b++ after b is 11, a++ after a gets a value of 12, and ++b after b is 12

b means to do self-increment first and then take the value of b. Therefore, the overall c output is 12, and b++ means that the value of b is taken as the value of the expression first, and then the auto-increment is made. The same goes for a++ and ++a.

**Can't tell how big.

Please measure it with a ruler.

a3—297×420

a4—210×297

A4 Under normal circumstances (except for special requirements) the flyer is printed on A4 paper, and the university has printed it for them when they distribute the leaflet, and it is A4 paper.

The picture shows the specifications of various paper sizes: