Thermal paper is also called thermal fax paper, thermal recording paper and thermal copy paper. It is also called thermal copy paper in Taiwan. Thermal paper is a kind of processing paper. Its manufacturing principle is to coat a layer of "thermal coating" (thermal discoloration layer) on high-quality base paper. It can produce high-resolution text or image after receiving electric pulse. It is usually used in electrothermal printer.
Thermal ink (temperature sensitive color changing ink) is a special thousand color color changing ink that senses color through temperature. It is also used in anti-counterfeiting industry. The anti-counterfeiting principle is that the color of the pigment changes with temperature. The anti-counterfeiting feature is that the color changes when feeling or heating. Thermochromic ink is easy to detect and suitable for public identification. It is widely used in the packaging of well-known products, especially cigarette packaging. The disadvantage is the poor color rendering effect of offset printing and embossing, and the technology is widely spread.
Thermal deformation material is shape memory anti-counterfeiting material, which is different from color changing material: color changing material is the change of ink color surface; The shape memory material is that the shape of the substrate itself is changing. When the temperature is ≥ 65 ℃, the shape memory material remembers the three-dimensional characters or patterns in the material or changes the original shape to another shape due to the chemical and physical reactions of the internal polymer compounds. The detection of shape memory anti-counterfeiting materials is also convenient, which can be distinguished by eyes. It is the same as the new technology. At present, it is applicable to many goods, and the technology is superb, which is difficult to counterfeit.
The instability of pen writing caused by faxing on thermal printing paper or printing factory is because the color reaction of thermal printing paper is reversible, the tone substances will be dissolved to different levels, and the tone of pen writing will fade slowly until the tone of pen writing completely fades on the paper. Therefore, it will continue to accelerate the dissolution of tonal substances and the fading of text and pictures under the effects of long storage time, long sunlight exposure time, long heat exposure and external standards such as high working temperature, wet and cold natural environment and touching adhesive tape paper. Naturally, the fading rate is also related to the thermal printing paper itself.
