The specification of the paper means that after the paper is made, it is trimmed and cut into one.
The size is fixed. In the past, how many "open" (for example, 8 or 16 open, etc.) is used to indicate the size of the paper. Today, China adopts international standards, and specifies papers such as A0, A1, A2, B1, B2, etc. The format of the format. The standard specifies that the paper's width (indicated by X) and length (indicated by Y) are proportional to X:Y = 1:n.
According to the basic area of the paper web, the format of the web is divided into A series, B series and C series. The format of the format A0 is: 841mm × 1189mm, the area of the web is 1 square meter; the size of B0 is 1000mm × square meter. ; C0 has a web size of 917 mm × 1297 mm and a web area of 1.2 square meters; the format of copy paper is only A series and B series. If the A0 paper is split into two equal parts along the length, it will become the A1 specification. When the A1 paper is turned apart in the length direction, it will become the A2 specification, so it will be opened to the A8 specification; the B0 paper will also be opened to the B8 according to this method. specification. The web sizes of A0 to A8 and B0 to B8 are listed in the table below. Among them, A3, A4, A5, A6 and B4, B5, and B6 are the specifications commonly used for copy paper.
Many countries use the ISO 216 international standard to define the size of paper, which comes from Germany.
Passed in 1922, defined A, B, C three sets of paper size, including the well-known A4 paper size, Group C paper sizes are primarily used for envelopes.
In addition, there are many non-standard sizes in China, such as the business acceptance registration form used by companies such as China Mobile, the size is 190mm*265mm, and it is easy to make mistakes when the copier is automatically selected.