If A0 paper is split in half along the length direction, it becomes A 1 specification; If A 1 paper is split along the length direction, it becomes A2 specification, and so on, it becomes A8 specification; B0 paper is also divided into B8 standard according to this method. The format sizes of A0 ~ A8 and B0 ~ B8 are shown in the following table. Among them, A3, A4, A5, A6, B4, B5 and B6 are common specifications of copy paper.
International standard: the specification of paper means that after paper is made, it is trimmed and cut into a certain size. In the past, the size of paper was expressed by the number of "open" (for example, 8 open or 16 open, etc. ). At present, China adopts international standards, which stipulate that the format and specifications of paper should be expressed by A0, A 1, A2, B 1, B2 and other marks. According to the standard, the proportional relationship between the width (represented by X) and the length (represented by Y) of paper is X: Y =1:N. ..
According to the basic area of paper format, the format specifications are divided into A series, B series and C series. The folio size of A0 is 841mm×1189mm, and the folio area is 1m2.
B0 has a width of1000 mm×1414 mm, and its width area is1.4m2. C0 has a width of 9 17mm× 1297mm, and its width area is/kloc-. The format specification of copy paper only adopts A series and B series.