The number of sheets of flat paper is calculated by order, regardless of paper size, every 500 sheets is a order.
The number of webs is usually calculated in tons, that is, the weight is used to reflect the quantity. The weight of a single sheet of paper is expressed in grams per square meter. The unit is gsm, or g / m2. If 80g of paper is 80g per square meter.
The specifications of flat sheets are usually 889mm × 1194mm, 880mm × 1230mm, 787mm × 1092mm, etc. The size of these papers directly stipulates the book size range. Before making a book, determining its finished size (format size) is one of the first things you should consider.
The thickness of the paper refers to the thickness of the paper.
For medium grammage thickness, the following estimation methods can be used:
Thickness of matte paper (mm) = gram weight / 1000
Double-powder paper thickness = gram weight / 1000ï¼0.02
Book paper thickness (mm) = gram weight / 1000 + 0.02
The following summarizes the paper types commonly used in books and periodicals for your reference.
In addition, there are newsprint, super matte paper specially printed, writing paper for printing various forms and exercise books, as well as map paper, braille printing paper, stamp paper, carbon-coated writing paper and Other types of paper In addition, special papers and various special fabrics have been dazzling in recent years.
There are many properties of printing paper:
1. In terms of paper structure, paper grain is produced by paper during the manufacturing process. Longitudinal paper grains are smooth grains, and horizontal grains are not smooth grains. When printing books and periodicals, the paper texture should be parallel to the spine, so it should be considered when opening the paper;
2. The paper's thickness, smoothness, stretch rate, etc. belong to the paper's physical properties. The smoother the paper, the more fine the dots can be restored during printing. If the paper stretch rate is large, overprinting will be inaccurate during printing, causing errors;
3. The mechanical properties of the paper include tearing degree, folding resistance and stiffness. For example, paper of the same thickness sometimes feels different in thickness. In fact, the paper with good stiffness gives a thicker feeling;
4. The whiteness, opacity, glossiness, etc. of the paper belong to the optical properties of the paper. The whiteness of the paper will affect the printed color picture. For example, the same picture is printed on the slightly yellowish white paper and the effect is bright; while the printed on the slightly bluish white paper is darker. In addition, the paper with poor opacity is one of the reasons for the through-printing.
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