Thermal paper production principle is in ordinary paper on powder coated particles is colorless dye phenol or other substance with thin film on heating conditions from melting powder mixed up chromogenic reaction, so they are heated black.
Thermal paper colour-display handwriting unstable, easy faded to document illegible.
With the development and popularization of office automation in economic, health, aviation and various business activities, and in the public security authorities to deal with all kinds of cases, such hit-and-run, thermal fax, thermal printers, used more widely, thermal paper has become a widely used technique, mostly for fax files and thermal printers print directly, etc.
Thermal paper is a special kind of coated paper, its appearance and normal paper similar surface smooth. Thermal paper, by ordinary paper, paper and as a heat-sensitive hair color coating layer, besmear in ordinary paper surface, hair color layer consists of adhesive, colour-display reagent, colorless dye (or hidden color dye), not be separated by microcapsule, chemical reactions in “lurk”. When meeting the fever somatosensory paper print head, the print head printed the colour-display reagent and colorless dye or chemical reaction and discoloration, graphic.
Thermal paper placed over 70 degrees, thermal environment start to colour coating. The color of the reasons from its ingredients to talk about.
Thermal paper coatings of thermal ingredients mainly is two kinds: one kind is colorless dye or hidden color dye, Another kind is chromogenic reagents. This kind of thermal paper also called bi-component chemical type heat-sensitive record sheet.
Mainly used as the colorless dye is: three benjia alkyl benzene phthalocyanine system of crystallization purple lactone (CVL Ying), silane system, colorless benzoyl methylene blue (BLMB) or screw pyranoid system, etc.
Commonly used agent is mainly: contrapuntal 4-hydroxy-benzoic acid and esters (PHBB, PHB), salicylic acid, 24-2 hydroxy benzoic acid or fang clan sulfones material.
After a heated paper thermal dye and colorless colour-display reagent happen chemical reactions, then use color on the fax machine in thermal printing or direct signal with thermal printers, texts and displayed. Because of the dye used to colorless, so many varieties have appeared to have different color of handwriting, blue, purple, black, etc.
For example, Ying dyestuff is colorless, show of silane compounds text color is black.
Tags: thermal paper, thermal paper rolls
