What are the principles and functions of carbonless paper? The front side of the paper can be copied when it touches the front side of the middle paper and the front side of the lower paper. Two upper sheets or two lower sheets cannot produce a copying effect.
The upper sheet is called CB paper, and only the lower side is coated with CB drugs and called CB side; the lower sheet is called CF paper, and only the upper side is coated with CF drugs and called CF side; the middle sheet is called CF side. It is called CFB paper, and its upper side is painted with CF side and the lower side is painted with CB side. It is very important to dye carbonless paper. CB medicine is a coating containing capsules, binders and auxiliaries. The particle size of the capsule is only 3-7цm, the shell is made of resin, and the interior is wrapped with solvent oil and contains leuco dye. When the capsule is damaged by external force, the dye oil will flow out. If the CB surface is attached to the CF surface at this time, the dye oil will flow to the CF surface to make the CF drug appear brighter. Coatings with additives, binders and auxiliaries, the color developer is mainly some resins and activated clay.