Detail the purpose of thermal paper with quality identify a problem _ printing devices

Thermal paper USES thermal paper: on the fax machine as text and graphic communication carrier, namely as fax paper; In medical treatment, meter measurement and control system for recording materials, such as electrocardiograph, thermal instrument recording paper, etc. ; Applied to the Internet terminal printing paper; In the business activities, used to make trademark, sign code ( POS） And so on, of which consumption occupies the largest percentage of fax paper. Thermal paper production principle is powder coated particles on plain paper base, composition is colorless dye phenol or other acidic substances, with thin film apart, under the condition of heat, thin-film melting, powder mixed chromogenic reaction. Color on the thermal paper's handwriting is not stable, easy to fade, cause it is difficult to identify the file content, commonly used is the thermal paper tickets. Ordinary thermal paper is not suitable for long-term preservation, but good thermal paper can save 30 years or longer. Thermal paper to identify the quality of the 1, appearance: if the paper is very white, shows that the protective coating and thermal coating of paper is unreasonable, added too much phosphors, a good paper should be slightly green. Paper smoothness is not high or look uneven, paper coating is not even, if the paper looks the reflected light is very strong, is added too much phosphor powder, the quality is not very good. 2, fire with fire: baking method is simple, with a lighter heating on the back of the paper, if after heating, the paper is now out of brown color and specification thermal formula is not very reasonable, save the time may be more short, if the paper is on the black part with thin stripes or uneven color piece, uneven coating. Good quality paper should be dark green (after heating With a little green) And color piece, the color become weak gradually from center to around. 3, sunlight contrast identification: will print out the paper with fluorescent pen after daub on the sun, This can accelerate the thermal coating light reaction) , fastest turn black, what kind of paper that can save the shorter the time.