Summary 1. Concept of thermal paper thermal paper is also called thermal recording paper, thermal paper, copy paper, thermal paper is the 3 m ( MinesotaMiningInkCharacter) Company in 1951, developed in the first place. Colorless dye type two-component thermal paper is coated with special coating processing paper, is a kind of the paper as the carrier, such as the recessive 1. Concept of thermal paper thermal paper is also called thermal recording paper, thermal paper, copy paper, thermal paper is the 3 m ( MinesotaMiningInkCharacter) Company in 1951, developed in the first place. Colorless dye type two-component thermal paper is coated with special coating processing paper, is a kind of the paper as the carrier, such as the recessive colorless dye, chromogenic agent, sensitizer as thermal hair color coating, adhesive and so on, constitute the hair color effect of thermosensitive information when it is heated with paper. 2. Thermal paper USES thermal paper used mainly has the following several aspects: fax machines, communications, medical, measuring system such as ecg machine, thermal instrumentation, computer connected to the terminal printing, trademarks, signed code ( POS) Etc. , most of these use the fax machine. Along with the high-speed development of information technology, paper printers and bar code technology is widely used, thermal paper, fast because of its unique performance bar code label image and the advantages of convenient, in the field of bar code to record information and paper printing has got rapid growth. 3. Thermal paper classified functionally thermal paper can be divided into general thermal paper and three anti thermal paper. Three anti thermal paper is on thermal hair color to coat a protective layer on layer, to give three thermal paper better waterproof, prevent oil and prevent the performance, such as friction is mainly used for 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. ; Another kind is to use under the action of heat, chemical reactions and chemical type thermal paper achieve the goal of hair color, is the most consumable products on the market at present, the thermal paper is divided into two components thermal paper and colorless dye hair metal compounds bicomponent thermal paper. 4. Thermal paper color rendering principle of molten transparent type thermal paper color principle is on the black base paper, coated a layer of opaque surface layer of wax, the thermal effect, opaque waxy material melt transparency, and constitute the image at the bottom of the base paper color display. Metal compounds hair color thermal paper color rendering principle is based on the fatty acid metal salt and reducing agent mixed together, using heat to heat up the fatty acid salt melt and reductive reaction, make the reduction of heavy metals and free color. Colorless dye type thermal paper color rendering principle is based on the inside contain alicyclic colorless dye mixed with chromogenic agent, under the action of heat, react with colorless dye heated melting agent and hair color.