2. Specification of paper
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Paper according to the different uses of the printing can be divided into flat paper and web, flat paper is suitable for general printing machine, web is generally used for high-speed rotary press.
The size of the paper is generally produced according to the standards set by the country. The paper size for printing, writing and drawing papers is: web width is divided into 1575mm, 1092mm, 880mm and 787mm; flat paper size is divided into size: 880mm x 1230mm, 850mm x 1168mm, 880mm x 1092mm, 787mm Six kinds of x 1092mm, 787mm x 960mm, 690mm x 960mm.
The standard for books and magazines and paper format size, the national regulations are to use 880mm x 1230mm, 900mm x 1280mm, 1000mm x 1400mm uncut single paper size printing. Due to equipment, production, supply and other reasons, the original 787mm x 1092mm, 850mm x 1168mm size paper can still continue to be used, but it should be noted that this size is to be phased out of the old standard format, after the paper size will be New national standards transition.
In the coastal areas, because of the large number of foreign-funded printing companies, many printing organizations still widely use some old versions of paper. Their specifications and sizes after cutting are shown in the figure.
The weight of the paper is expressed in terms of weight and weight. It is generally expressed in terms of quantification, which is what we commonly call "weight." Quantitative refers to the mass relationship of the unit area of paper, expressed in g/m2. For example, 150g of paper means that the weight per sheet of this type of paper is 150g. Paper with a weight of 200 g/m2 or less (including 200 g/m2) is called "paper", and a paper with a weight exceeding 200 g/m2 is called "cardboard." The order weight refers to the total mass of paper per order (1 sheet for 500 sheets) and the unit is calculated in kg (kg). According to the paper's basis weight and size, the weight can be calculated using the formula of weight (kg) = paper size (m2) x 500 x basis weight (g/m2).