Thermal paper is used as a communication carrier for words and graphics on the fax machine, that is, as fax paper; in medical and measurement systems, it is used as a recording material, such as electrocardiogram drawings, thermal instrument recording paper, etc.; it is used in printing paper used in Internet terminals; in commercial activities, it is used to make trademarks, signature codes (POS), etc., among which the amount of fax paper accounts for the largest proportion. Today, Cheng Cheng Xiaobian will give you a brief introduction to the relevant knowledge of thermal paper.
The production principle of thermal paper is to coat the ordinary paper base with particles, the powder composition is colorless dyes, phenol or other acidic substances separated by a film, under the heating conditions, the film melts, the powder is mixed with a color reaction The handwriting on the thermal paper is unstable and easy to fade, which will cause the content of the document to be illegible. As for how to identify the quality of thermal paper, there are detailed relevant contents in GB/T 28210-2011 Thermal Paper.
This standard is applicable to all kinds of thermal paper that directly obtain images through thermal action. The indexes of thermal paper mainly examine quantitative, compactness, brightness, smoothness, tensile strength, tearing, static color development, dynamic color development, image preservation performance and delivery moisture.
Thermal paper is mainly divided into two categories: ordinary thermal paper and special thermal paper.
(1) Ordinary thermal paper refers to thermal paper without protective coating on the surface. The technical indicators are as follows:
(2) Special thermal paper refers to thermal paper with a protective coating on the surface and some specific requirements. The technical indicators are as follows:
Cheng Cheng's conclusion: When purchasing and using thermal paper, in addition to the general physical properties of paper products, we should also pay attention to the test of the image performance of the thermal paper. The tests related to image performance include dynamic color development performance, static color development performance, and image preservation performance, which are the key indicators to distinguish the quality of thermal paper.