Sketch paper, also known as copy paper, has high physical strength, excellent uniformity and transparency, good surface performance, fineness, smoothness, no bubble sand and good printability. Tracing paper is light in weight, translucent in color, good in abrasion resistance, water resistance and ink absorption.

The wire drawing has the characteristics of opacity, no spots and high wear resistance. The printing paper is thick, You Lan.

2. Different uses

Copy paper is a kind of advanced paper for cultural industry, which is difficult to produce. Translucent paper, especially used in tracing paper, depicting engineering or mechanical design drawings and book illustrations. It's gray and looks like frosted glass.

Drawing refers to a kind of paper used to draw engineering drawings, mechanical drawings and topographic maps. Blueprint, commonly known as "blue-blue drawing", is a kind of chemical paint processing paper, which is specially used in various engineering design and machinery manufacturing.

Extended data

Classification method of printing paper

From the use method:

1. Wet printing, that is, water washing printing, that is, iron salt printing, is reduced by water washing, but some units are still using this method.

2. Dry printing paper, that is, diazo addition printing paper, or ammonia smoked printing paper, its photosensitive reduction system uses ammonia gas, which is supplied in China.

3. There are two kinds of semi-wet prints, one is to coat both sensitizer and reducing agent on paper, and then compound them while exposing them, which is not available in China; The other is used for dry printing, when printing, ammonia water is evaporated into mist, so that it can be printed while drying.

From line color point:

1, blue line with white background, white line with blue background, brown line with white background, wet printed drawings.

2. Purple lines on a blue background, brown lines on a white background, black lines on a white background, and dry-printed drawings. There are many purple lines with blue background in China, and some areas have blue lines or black lines with white background.

Divided from coating surface:

There are two kinds of single-sided coating and double-sided coating.

1, single-sided coating has two meanings: one is to coat photosensitive liquid only on used paper; The other is to coat one side with photosensitizer and the other side with boric acid water to eliminate the warping of paper and improve the storage life. Actually, it's painted on both sides. Because only one side is photosensitive, it is also called one-sided cloth shoes, which belongs to most areas of China.

2. Double-sided coating is to coat photosensitive agent on both sides, and both sides can be printed, mainly to reduce the amount of data and save paper. At present, there are 19 places in China, such as Shanghai, Beijing, Tianjin, Hangzhou, Nanjing and Wuhan. In recent years, the development direction is double-sided coating with blue line and white background, because blue line prints are faster than purple line 1/5 under the condition of constant storage time, and the colors are bright and the photosensitive speed is wide.

Reference source: Baidu Encyclopedia-copy paper

Reference source: Baidu Encyclopedia-tracing paper

Reference source: Baidu Encyclopedia-homemade drawings.

Reference source: Baidu Encyclopedia-Print drawings