Application of laser marking machine in plastics industry
The CO2 laser marking machine evaporates the waste material by etching the plastic surface to obtain a contrast mark, with little change in color. Marking speed is the key in the process of bottling production line coding, especially when printing large characters, usually using CO2 laser.
Suitable for carbon dioxide laser marking machine marking plastic PVC, ABS and most of polyester resin; commercial mica filled, such as PP, the use of carbon dioxide laser marking machine marking will produce frosted gray marking. Although the output power of CO2 laser marking machine can reach 200W, the power used for plastic marking only needs 10 ~ 25W, the highest is 50W.
Solid Nd:YAG laser marking machine
Nd:YAG laser marking machine is a popular marking equipment at present. It is generally used for high quality printing of parts, such as electronic connectors, engine hood and so on. Because the laser wavelength of Nd:YAG laser marking machine is short, the energy is high, so it can get higher clarity. But heating the plastic causes thermo chemical reactions (such as foaming) and color changes.
Requirements and process characteristics of finished products
Before marking equipment, we must understand the production and marking requirements. For example, the high frequency laser is preferred because of the high contrast requirements and the failure of the label to be interrupted. In addition, attention should be paid to whether the equipment's low output power is suitable for speed requirement.
Adaptability of plastic products to laser
Different plastics have different laser energy absorption rates. Some plastics are easy to label because they are easy to absorb energy, while others do not absorb lasers and can not generate markers with lasers. The absorption rate of laser energy is a function of wavelength, so different plastics can be labeled with different quality under the same laser intensity. For example, some colored HDPE and polycarbonate with YAG laser, without adding any additives can get ideal marks; and the use of carbon dioxide laser marking machine, without adding special additives, India is not good. In addition, degradation of plastics, cracks and voids on the surface can also degrade the quality of the mark.
In addition to the use of laser marking additives to improve the printability of plastics, there are also special laser printing labels, such as low gloss black acetic aldehyde copolymer specially designed for laser marking, which has the function of anti ultraviolet radiation.
The role and types of laser marking additives
Laser marking additives can change the spectral absorption characteristics of plastic, especially for special plastic absorption of the laser, the correct use of laser marking additives suitable for laser marking, and the quality can be comparable with the normal marker.
The function of laser marking additives
The main function of laser marking additive is to absorb laser energy, convert the laser beam into heat energy, produce heating effect on the plastic, carbonization, evaporation and chemical reaction.
Varieties of laser marking additives
Additives for different laser has a number of varieties, such as additive for carbon dioxide laser marking, for different chemical properties of plastics, laser marking and laser marking light dark light background dark background on different varieties.
As a Mark-lt laser marking pigment is a specially designed for YAG plastic laser marking machine design of laser marking additives, printing for PE, PP, GPPS, HIPS, ABS, PET, PBT, nylon, epoxy resin, ABS/PC, PC and other plastic.