Thermal paper is also called thermal recording paper, thermal paper, copy paper, thermal paper is 3 m (MinesotaMiningInkCharacter) companies in the United States first developed in 1951. Colorless dyestuff two-component thermosensitive paper is processed paper coated with special coating. It is a kind of information paper which is composed of invisible colorless dye, colorant, sensitizing agent, adhesive and so on as the heat sensitive hair color coating.
2. Thermal paper using ways
The using ways of thermal-sensitive paper mainly have the following several aspects: facsimile machine, communication, medical treatment, recording and measuring system such as electrocardiogram machine, thermal instrument, computer networking terminal printing, trademark, label (POS), etc. With the rapid development of information technology, bill printer technology and bar code technology have been widely used, thermal paper because of its unique performance, the advantages of rapid image generation and convenient bar code label, in the field of bar code record information and bill printing has been rapidly growing.
3. Thermal paper classification
Thermal paper can be divided into ordinary thermal paper and three anti thermal paper from the function aspects. Tri-proof thermal paper is a layer of protection on the thermal hair color layer, to give tri-proof thermal paper better waterproof, oil-proof and anti-friction properties, mainly used in the high-end market.
Thermal paper mainly from the structure is divided into two categories, one is using thermal in assaying the fineness of colored pigment physics, physical type thermal paper records effect, the thermal paper is divided into molten transparent type, melting heat transfer printing and sublimation type, etc., the representative of which is melting transparent type of thermal paper, it is widely used in medical eeg and ecg, etc.; The other is the use of heat under the action of chemical reactions to achieve hair color purpose of the chemical thermosensitive paper, is the largest amount of products on the market at present, this kind of thermosensitive paper is divided into two components of metal compounds hair color thermosensitive paper and colorless dye two-component thermosensitive paper.
4. Thermal paper color rendering principle
Melting transparent thermal paper color rendering principle is in the black base paper, coated with an opaque layer of wax as a surface layer, through the role of the hot pen, opaque waxy material melting transparent, the color of the underlying layer of the base paper revealed and formed an image. The color developing principle of metallic compound color sensitive paper is that heavy metal salt and reductant based on fatty acid are mixed together, and fatty acid salt is melted and reductant is reacted by heating temperature, so that heavy metal is reduced and color developing is free. Colorless thermosensitive paper coloring principle is based on the colorless dye containing inner fat ring and colorant mixture, under the action of heat, colorant and colorless dye melting reaction and color.