I. Copperplate Paper
What we call copperplate paper is made of bleached wood pulp coated with white chemicals and then calendered. In the process of paper consumption, there are two kinds: one-sided coated calendering and two-sided coated calendering, so our copperplate paper can be divided into one-sided and two-sided.
In addition, the calendering surface is divided into bright and matt, in the industry referred to as smooth copper and sub-powder, that is, printing agency Title "copper plate paper" and "sub-powder paper", in fact, they are copperplate paper. Copper plate paper is characterized by high surface lubricity and whiteness, average difference in thickness, small flexibility, strong recovery ability, and relatively low price.
The sub-powder paper looks in the sunlight, which is less reflective than the light copper paper. The pattern printed with it is more delicate and high-end than that printed with copperplate, although there is no bright color of copperplate paper. Ordinary sub-toner paper will be thinner and white than smooth copper paper, more ink-eating, and more rigid, unlike smooth copper paper, it is easy to deform, feel that books with uneven pages must be smooth copper paper. As long as the color printing will use sub-toner paper, black and white is light copper paper or offset paper (that is, recycled paper).
Usually we say 157, 185, etc. refer to the weight of copperplate paper per square metre. There are 70-350g/m2 copperplate paper on the market, and more than 300g/m2 is called copperplate card.
2. Offset Paper
Offset paper is made by sizing the surface of raw paper made from bleached wood pulp. It absorbs ink equally. The surface lubricity, density and printing effect of offset paper are worse than those of copperplate paper.
III. Special Paper
Special paper is also called fancy paper, which is made of different materials. It belongs to decorative paper. Some of the paper's exterior embossed lines and some of them have been treated specially. Because of the different material and paper-making technology, there are many kinds of special paper with abundant colors. It is often used in fashionable avant-garde packaging, printing, books and picture albums to highlight the design effect, but the price is generally higher than that of ordinary paper. Paper, packaging and printing should also pay special attention to color restoration.
Besides this paper, there are letterpress, white cardboard, newsprint and so on.
Four, open number
Generally speaking, the opening is to divide a positive paper (787mm * 1092mm) or a large paper (889mm * 1194mm) into several equal parts. Standard uncut paper is called full open, opposite is divided into two, four is divided into four, and so on. Most fast printing companies in the market choose to stop cutting large paper.
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