Why can thermal paper express label develop color quickly and remain clear under certain conditions?
Publish Time: 2024-11-28
The reason why thermal paper express label can develop color quickly and remain clear under certain conditions is mainly due to its special material composition and color development principle.1. Material compositionThermal paper express label is mainly composed of the following parts:Paper base: usually ordinary paper, providing physical support.Thermal coating: This is the key part of thermal paper, containing thermal dye and color developer.2. Working principle of thermal coatingThe main components of thermal coating are thermal dye and color developer.Thermal dye: usually a colorless dye, such as crystal violet lactone (CVL), which is colorless at room temperature.Color developer: usually a phenolic compound, such as bisphenol A or phenolphthalein.3. Color development processWhen thermal paper is heated by a heat source (such as a thermal print head or thermal label printer), the thermal dye and the color developer react chemically to produce a colored substance. The specific process is as follows:Heating: The heat source (such as a print head) applies heat to the thermal coating.Dissolving and diffusing: The thermal dye dissolves and diffuses into the developer at high temperature.Chemical reaction: The thermal dye and the developer react chemically to generate a colored substance.Color development: The generated colored substance forms a visible image in the thermal coating, such as text or a barcode.4. Reasons for rapid color developmentHigh sensitivity: The thermal dye and the developer have high sensitivity and can respond to heat changes in a short time to quickly generate colored substances.Uniform heating: The thermal print head or printer can evenly heat the thermal coating to ensure uniform and rapid color development.5. Reasons for long-lasting clarityChemical stability: The generated colored substance has good chemical stability and is not easily affected by external environmental factors (such as light, moisture, oxygen, etc.), keeping the color clear.Coating protection: The thermal coating usually contains other additives, such as antioxidants and UV absorbers, to further protect the colored substance and extend the clarity and service life of the label.6. Application scenariosExpress label: Thermal paper express label is widely used in the logistics and express delivery industries. It can efficiently mark and track packages due to its fast color development and long-lasting clarity.Supermarket cashier: In supermarkets and retail industries, thermal paper cashier receipts also use similar technology to quickly generate transaction records for easy management and archiving.7. PrecautionsAvoid prolonged exposure to high temperatures: Thermal paper may cause further reaction of color-developing substances when exposed to high temperatures for a long time (such as direct sunlight or near heating equipment), affecting the clarity and service life of the label.Avoid contact with chemicals: Certain chemicals (such as solvents, acids and alkalis, etc.) may affect the chemical stability of thermal coatings, resulting in a decrease in color development.Through the above principles and measures, thermal paper express labels can quickly develop colors and remain long-lasting and clear under specific conditions, meeting the needs of the express and logistics industries.
