The application of paper opening is very common in life, but there is no special use in life. Some art students often draw with 4-size paper or 6-size paper.

Paper produced according to national standards is called fully open loose paper. Cut a completely open piece of paper into several small pieces with the same area, and call it how many pieces. If the whole paper is divided into two halves, each half is called folio, and the whole paper is divided into four parts, each of which is called quarto.

The size of 880× 1230mm paper is larger than other papers of the same format, so the utilization rate of paper is higher when printing, and the form is more beautiful and generous, which is an international standard.

Paper size:

Generally speaking, after paper is made, it is trimmed and cut to a certain size. In the past, the size of paper was measured by "opening".

To say "how many times" is to divide a piece of paper into several equal parts, and the size of one part is to divide a piece of paper into four equal parts and take one.

For the text of a book, the meaning of the folio number is the same as that of the folio number, but for the folio number of the cover and the insert, the meaning is different because of the different areas.

Forward opening method refers to the method of unidirectional opening of the whole paper, that is, vertical or horizontal opening method. Segmentation method refers to the method of separating the whole paper horizontally and vertically. Segmentation method is usually used in the case that it is difficult to cut the paper by forward opening method.