Prepress production basic tutorial D
Second, paper
Paper is one of the important things that prepress workers need to pay attention to, and it determines the vast range of printed products.
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1, the composition of the paper
Paper is a kind of material added from plant fibers to fillers, rubber compounds, pigments, and other components.
The raw materials that make up paper are straw, bamboo, cotton, and available waste. Depending on the raw materials, the nature of the formed paper will also be different.
Fillers are materials used to increase the flexibility of paper, reduce paper transparency and stretchability, and make the surface of the paper even and even, such as talc for general printing paper, kaolin for high grade paper, and barium sulfate. The use of filler should be appropriate, usually about 20% of the paper, too much will reduce the resistance and flexibility of the thread, and will hinder the absorption of ink, resulting in the powder off when printing.
The rubber compound is used to fill the small pores in the paper to improve the water resistance of the paper, and it can also improve the gloss and strength of the paper and prevent the paper from fluffing. Commonly used rubber compounds are rosin, alum and starch.
The colorants are used to enhance the color purity of paper, and most of them use inorganic pigments or organic dyes.