How old is 8K in Gregorian calendar?

6k, 8k, 12k are commonly called 6-K, 8-K and 12-K, and their sizes are as follows:

Unit: mm

Positive 6-open: 362×390

Big 6 holes: 387×422

Positive 8 open: 27 1×390

Big 8 open: 290×422

Positive 12: 273×262.3

12khz: 298.5×296.3

Extended data:

Paper size refers to the paper size range supported by folding machine and collating machine, which generally includes the maximum size and minimum size, and is generally expressed by paper specifications. If it is larger or smaller than the paper in this size range, the product will not be folded and matched.

According to the size, folio is usually divided into three types: large format, medium format and small format. For 787× 1092 paper, 12 format is large format, 16 ~ 36 format is medium format, and 40 format is small format, but books with mainly characters are generally medium format. The folio shapes are all rectangles with different proportions except 6-size, 12-size, 20-size, 24-size and 40-size, which are suitable for books with different properties and uses.

References:

Paper size _ Baidu Encyclopedia