The size of the paper is represented by open , so how is open defined?

One open is half a large piece of paper, that is, the whole paper is opened into two, which is one open, 8 open or 16 open, that is, a whole piece of paper is divided into 8 points or 16 points. Kai means to cut.

Positive full open (for educational books, offset paper is the majority): 787 x 1092 generous full open (for text printing, general books are mostly printed with this full open specification, offset paper is the majority): 850 x 1168

Generous full open (exquisite booklets, coated paper): 889 x 1194 Generous full open (for general books, less used than the first 2 kinds of generous): 880 x 1230 according to this domestic mainland paper full open, positive 1 kind, generous 3 kinds.

Which specification to choose depends on.

1. The needs of the print itself, 2. The design specifications of the publishing house to publish the book, 3. The requirements of the printing customer.

4. The printing factory's own paper inventory.

32 carat 130 x 185

16 carat 185 x 260

These two can be determined.

8 carat 260 x 370

4 carat 370 x 540

2 carat 540 x 740

These 3 are not so sure.

There is no fixed rule on folio in China, and it is almost enough to do so, mainly depending on the size of the book and the booklet itself.

When it opened, it was the size of the paper we usually used to buy when we bought it, and it was also the size of two large newspapers put together.

The 8 test papers used for the usual exams are as big as they are combined, and the 16 sheets of 16 sheets are that big together.

If you ask me, I'm a connoisseur!

Paper is generally divided into type A and type B in China.

A-type paper is positive with a degree of 880*1230mm

B-type paper is 787*1092mm

Open is to say a fraction of an open paper.

16 is 1 1/16 of a piece of paper.

Common paper sizes include 889*1194....Better! It is also divided into sheet-fed paper or web.

Magazines are basically 16 pages, and general books are 32 pages.

Web Links.

The number of sheets, also known as the number of sheets of paper, is used to express the size of the paper during the printing process. The open number refers to how many plates are typeset on a full sheet of paper or how many pieces of paper are cut. A full sheet of paper is called fully open; Arrange the whole sheet of paper in two plates, fold it in half once or cut it once from the middle, and call it two or two; The folio paper is cut or folded in half from the middle to four open, and then cut or folded in half in turn is called eight open, 16 open, 32 open, 48 open, etc.

To put it simply, the size of the whole sheet of paper after folding in half is in half, then folded in half for 4 open paper, then folded in half for 8 open paper, then folded in half for 16 open, then folded in half for 32 open, and then folded in half for 64 open.

The specifications of each folio are as follows:

The standard size of fully open paper is 787*1092mm

The standard specification of 4-carat paper is 389*546mm

The standard specification of 8-carat paper is 260*370mm

The standard specification of 16-open paper is 185*260mm

The standard specification of 32-page paper is 185*130mm

The standard specification of 48-carat paper is 185*950mm

The paper size refers to the size range of the paper that the folding machine can support, which generally includes a maximum size and a minimum size, which is generally expressed by the size of the paper. If the size of the jujube is larger or smaller than this size of paper, the product cannot be folded and paged.

The size of the folio stipulated by the state is the international standard series, which has been set into the national industry standard GB T 1999 and implemented in the country. The current size of the book is mainly A series specifications, which are as follows: A4 (16K) 297mm 210mm; a5（32k）210mm×148mm；A6 (64K) 144mm 105mm, of which A3 (8K) size has not yet been determined, but 420mm is commonly used.

The paper we commonly use is in series A and B formats.

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 the whole sheet, and the result of its positive 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 key calendar degree 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

Number of open stools (large) Size unit (mm).

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: The size of the finished product = the size of the paper manuscript and the 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

Equal portions. It is to fold a whole sheet of paper in half repeatedly, and then divide it into even equal parts along the fold line. For example, fold a whole sheet of paper in half three times and divide it into 8 equal parts, i.e. 8 open. Fold it in half four times and divide it into 16 equal parts, that is, 16 open....

Commonly used paper (flat paper): 787x1092 mm 880x1230 mm.

Common folio size (unit: mm).

Size (positive): 787 x 1092

Folio: 736 x 520

4 open: 520 x 368

8 open: 368 x 260

16 open: 260 x 184

32 carat: 184 x 130

Divide a sheet of fully open (31 43 inches) paper into 16 equal parts or 18 equal parts or 32 equal parts, and the resulting size is expressed as 16 carat, 18 carat, and 32 carat.

Here are the actual dimensions of each folio:

16 open: 190 260 mm

18 open: 170 230 mm

32 open: 130 190 mm

Standard in Europe**. The unit is inch

The area of A0 is one square meter, and the drawing is one size difference, and the area is twice as bad, the size of A0 is 1189mm 841mm, the size of A1 is 841mm 594mm, the size of A2 is 594mm 420mm, the size of A3 is 420mm 297mm, and the size of A4 is 297mm 210mm

A4 paper: paper with a size of 210mm and 297mm.

X open paper is a large piece of paper (1 meter 1 * 80) divided into x parts.

So A4 is basically 16 open.

Fully open, positive, 787*1092, generous, 889*1194, open, positive, 787*546, generous, 889*597, four, open, positive, 389*546, generous, 444*597, positive, 370*520, generous, 420*285, eight, open, positive, 389*273, generous, 444*297, sixteen, positive, 185*260, generous, 210*285, thirty-two, positive, 185*130, generous, 142*210

Specifications of the printed paper.

Size The size and shape of the lithographic paper are determined by the length and width dimensions. Its length and width are specified by the competent national authorities according to the opening method of the printed matter (the most commonly used is the geometric progression of 32 openings) and the requirements of the printing plate. The web paper only specifies its width (or length), and the length (or width) of the sheet is cut out on the printing press, so the web size is essentially the same as the flat paper size, but the form is different.

Although the length and width of the printing paper are stipulated by the competent national authorities, it is not simply artificially stipulated, but has its scientific basis: first, it is necessary to maintain the beautiful shape of various printed matter printed by the conventional opening method, and not to make the printed books square or narrow strips, giving people the feeling of incongruity in the hands of potatoes. Second, it is necessary to keep the shape of books with different opening numbers (such as 16 kai and 32 open potato calendars) similar when using the geometric progression method.

From the point of view of striving for the beauty of the shape of the printed matter, the aspect ratio of the paper and the finished book makes people feel that the most appropriate ratio is the so-called "** ratio". "**Ratio" is length: width: 1.

In order to keep the shape of books with different open numbers similar, it is necessary to study the method of cutting (or folding) the paper. Paper is generally cut in half. The length after cutting (or folding) is the width before cutting, and in order to maintain the shape of the shape after cutting and before cutting, it is necessary to maintain the ratio of length to width before cutting.

i.e. requirements: a:b b:

a 2), that is, in order for the shape of a 32-folio book to be similar to that of a 16-folio and 64-folio book, the ratio of the length to width of the paper size must be close to: 1.

Many countries outside of the country have adopted this aspect ratio. For example, Japanese flat paper 841*1189 (mm), the international general size used in China.