A guide to the basics of printing paper!

The finished printed product cannot be separated from the choice of paper, it is important to understand the basics of printing paper.


Full sheet

Flat paper is cut to a certain size at the factory for large-format sheetfed presses, which is called "full sheet," full sheets can also be further slit by the printer into smaller widths for various models of sheetfed presses.

The area of the full sheet is a specific specification that is used consistently throughout the paper and printing industries. In China, the most used specifications are these, which have agreed-upon names.


Paper opening

According to national standards for the production of paper called a full sheet, a full sheet of paper is cut into a number of small sheets of equal area, called how many open numbers. If a full sheet of paper is divided into two halves, each half is called a "folio", and if a full sheet of paper is divided into four parts, each part is called "4 open". For example, the familiar "16" is a full sheet of paper divided into 16 parts.



Common printing sizes of paper: (Unit: mm)


Positive degree (uncut full sheet 787X1092)

Positive folio 530X760 Positive 4to 380X530

Positive 8 open 260X380 Positive 16 open 190X260

Positive 32 open 130X190 Positive 64 open 95X130


Large (uncut full sheet 889X1194)

Large Folio 580X860 Large 4to 420X580

Large 8 open 285X420 Large 16 open 210X285

Large 32 open 140X210 Large 64 open 105X140


Paperweight

The "weight" of paper is the weight of paper per square meter, measured in grams. The real purpose of dosing is not to weigh the paper, but to reflect the thickness of the paper. The higher the weight, the thicker the paper.

For example, if a certain coated paper weighs 157 grams per square meter, it is called "157-gram coated paper".