The use of carbon paper has been around for decades. The traditional blue carbon ink copy paper is almost out of date. The popular carbonless copy paper does not need to add carbon coated paper between paper and paper. It can be directly copied and directly displayed. The color function and the characteristics of small pollution and convenient use are more and more widely used. Carbonless copy paper is also known as pressure sensitive recording paper. Invented by NCR (National Cash Register) in the United States in 1954, after decades of continuous development and improvement, industrial production has now reached a certain scale.
Carbonless copy paper can be divided into two kinds of color development and self-developing color, and the most used one is color-developing carbonless copy paper. The color development process is to overflow the force sensitive pigment and the oil solution in the microcapsule under the action of external force, and the dyeing reaction occurs after contact with the color developer, thereby achieving the rewriting effect.
For coating compositions of carbonless paper, at least two different compositions are required, namely microcapsule coatings and chromogenic coatings.
Microcapsule coating
The microcapsule coating is composed of a force sensitive pigment, a carrier of a force sensitive pigment, a nonvolatile oil, an emulsifier, a protective colloid, a liquid film hardener, and the like. The preparation of the coating is to prepare the microcapsules by different methods.
Limin dye is a kind of leuco dye, which is the basis of carbonless copy paper. In a sense, there is no heat-sensitive pigment, and there is no carbonless copy paper. Commonly used as a force-sensitive color leuco dye are phenol type, phenothiazine type, fluoran series and the like. Force-sensitive pigments for carbonless copy paper are mostly solid at room temperature. The solid force-sensitive dye cannot react with the developer and adsorb on the developer. Therefore, it is necessary to dissolve the pigment into a solution to transfer it to the developer to be adsorbed by the developer.
In the production of carbonless copy paper, an oil solvent is mainly used to dissolve the force sensitive dye. As a good solvent, there are the following requirements: (1) easy to dissolve the force sensitive pigment; (2) the obtained solution is easy to be microencapsulated and has good stability; (3) can enhance the reaction between the dye and the color developer; (4) Good fluidity and microcapsule rupture can promote complete dye transfer; (5) low odor, non-toxic and inexpensive. General solvent selection
An aromatic or aliphatic substance having a boiling point higher than 200 ° C, such as diisopropylnaphthalene, diphenylmethane and homologues, biphenyl and homologues or derivatives such as cyclohexanebiphenyl and isopropylbiphenyl.
Chromogenic coating
The chromogenic coating consists of a developer, an adhesive, and other auxiliaries. There are three main types of developers: activated clay series; the other is a series of phenolic resins; and another is a series of aromatic carboxylic acid metal salts.
Carbon paper market price
Each copy of the carbon paper (three counts) is between 0.2 yuan and 0.25 yuan.
The above is about the principle of carbon paper and the price analysis of the carbon paper market. I hope that these contents can provide useful help for everyone.
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