Principle of carbon paper: carbon paper is a kind of paper with acid developer on the front and microcapsules containing colorless-colorless dyes on the back. When the paper is overlapped, the microcapsules are broken due to mechanical pressure, colorless-colorless dye overflows, and discolors with acid, forming an image. This kind of paper can be used for multiple overlapping papers, mainly for bills.
Extended data:
I. Types of carbon paper
1, heat-sensitive paper: There are heat-sensitive chemicals on the paper, which will turn black after high temperature. When the pen tip passes by, the friction instantly produces high temperature, which makes the place where the handwriting passes black. It is not suitable for archiving.
2. Pressure-sensitive paper: it is a kind of paper that uses the pressure acting on its surface to form characters or patterns. When the upper and lower layers are subjected to a certain external force, they will produce traces, which are generally used to print various bills and bills.
3. Carbonless carbon paper: carbon paper without colored wax. When multiple pages of carbonless carbon paper are stacked together, multiple documents can be copied by direct printing or pen writing. It is not only convenient and clean, but also can be made into punched blank computer printing paper to realize efficient continuous printing and copying.
Second, the classification of carbonless copy paper:
1. Carbonless copy paper is divided into five types: upper paper (cb), middle paper (cfb), lower paper (cf), single-function self-sensing paper (sc) and double-function self-sensing paper (scb).
2. Carbonless copy paper is divided into blue printing paper, black printing paper or other color printing paper according to different colors.
3. Carbonless copy paper is divided into five colors: red, yellow, blue, green and white.
4. Carbonless copy paper is divided into grade one, grade two and grade three according to different quality.
5. Carbonless copy paper is divided into ordinary type and light-resistant type according to light resistance.
Baidu encyclopedia-carbon paper