With the wide application of fiber lasers in laser devices, the laser marking market is also booming.However, the marking patterns we see in daily marking products are basically black and white gray.From the current laser marking process, only some fiber lasers can be color-coded on stainless steel.
When marking the stainless steel material, the laser changes the color of the surface layer of the material by adjusting the laser beam so as to obtain different color decorative effects.The advantage is that the pulse width and frequency are independently adjustable. Adjusting one of them does not affect other laser parameters. This is not what the Q-switched structure laser does.This feature increases the infinity of stainless steel color marking.Pulse width, power, filling method, delay parameters and other factors will affect the color effect in the actual marking operation.
Because the technology is not very mature, it has its limitations, and the price is unacceptable to most manufacturers.A color laser marking machine is several times more expensive than a typical laser marking machine.The new technology of laser color marking recently developed a laminate group from Germany. The laminate group includes external laminates and internal laminates.Wherein the outer laminate comprises a transparent polymer carrier, a color laser markable layer of an infrared dye having an absorption maximum in the infrared region on one side of the carrier,This laminate can be used for almost all common marking materials. This technical advantage is different from the ordinary laser paper on the market.
A composition that can be used for laser color marking also appears in Japan and its preparation method.The composition components include: 100 parts by weight of the polymer; the content of the laser marking powder is 0.05622 parts by weight; the content of the temperature sensitive substance is 0.16210 parts by weight.
The preparation method comprises: melt blending the components including the polymer, the laser marking powder and the temperature sensitive substance according to the group allocation ratio.In the present invention, by adding a warm-sensing substance and utilizing the heat generated during the laser marking process, the thermal-sensitive substance undergoes thermal decomposition, oxidation, and the like at a certain temperature.These reactions destroy the original material structure or generate a new substance, while producing a new color,This color change is unidirectional, irreversible, and does not restore the original color after cooling, thus resulting in a stable permanent mark on the product.
It is believed that in the future, laser color marking patterns will be more complicated and diverse under the constant innovation of these technologies. The exquisite decorative effects will give laser marking a wider application space and become a major trend of laser processing applications.
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