Production of heat-sensitive paper: It is conceivable that heat-sensitive paper is a kind of ordinary paper, which is coated with two layers of paint and separated by a layer of film to make sandwich biscuits. In order to preserve the handwriting for a long time, some paper has added a layer of film on the top layer, which increases the cost. It is also called the upper product of thermal paper.

Let's talk about the composition of these coatings. The two layers separated by the film are usually acidic substances and different color developer. For example, some words are black, some are purple, and some are blue. Of course, different color reagents are different, but almost all of these acidic substances contain something called bisphenol A (BPA).

Printing process: The thermal printer has a simple structure, consisting of a drum and a print head, without an ink cartridge. The print head has many tiny semiconductor elements that can heat specific areas according to the text to be printed. The heat after commissioning has two basic functions: melting the film and making the two substances react and color rapidly. With the roller drive, a roll of printing paper is unfolded and the handwriting is clear and legible.

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