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The specification of paper means that the paper is trimmed and cut to a certain size after it is made. In the past, how many “on” (such as 8 on or 16 on, etc.) was used to represent the size of the paper. I used an international standard, specifying that A0, A1, A2, B1, B2, A4, A5, etc. be used to indicate the paper size specification. The standard stipulates that the ratio of the width (indicated by X) and length (indicated by Ý) of paper is X:Y=1:n.
According to the basic area of the paper format, the format specifications are divided into Series A, Series B and Series, the format size of A0 is 841mm × 1189mm, and the area of the area is 1m2; the size of B0 is 1000mm × 1414 mm with a web area of 2.5 square meters; C0 has a web size of 917 mm x 1279 mm and a web area of 2.25 square meters. The format specification of copy paper uses only one series and B series. If the A0 paper is split into two halves along the length, it becomes A1 size. When A1 paper is split along the length direction, it becomes A2 size, so it is split to A8. Specifications; B8 paper is also split according to this method to B8 specifications. A0 to A8 and B0 to B8 are listed in the following table. Among them, A3, A4, A5, A6 and B4, B5, B6 and other 7 format specifications are common specifications for copy paper.
For example, “A4” paper folds a basic size paper four times, so the area of a single A4 paper is one of the four fourths of the basic paper area, that is, 1/16. The rest and so on.