Comparing 355 nm UV DPSS marking and ink coding
Nov 12 , 2022Comparing 355 nm UV DPSS marking and ink coding
If there is no production date, shelf life and other information on the food packaging bag, do you dare to buy it? Not only that, today, when consumers are generally very concerned about food safety, even the ambiguous information on the packaging bag can easily make people feel that there may be tricks in it, and people can't help but ask if it is fake. Three no products? Or expired product?
More and more manufacturers have realized this. It is a common way for manufacturers to mark on the outer packaging bags of snacks, and it is also an indispensable part, such as logo, date or batch number, etc. Moreover, in order to eliminate the problems of easy falling off, fuzzy wear and tear in the traditional methods of labeling and coding, many manufacturers have turned to laser marking equipment.
uv dpss laser marking sample
This is because laser marking directly acts on the local surface of the object through a high-energy density laser beam, causing the surface material to rapidly vaporize or change color, and then leave the required graphic marks, which are permanent and not easy to wear. And erasing, the whole marking process is very fast, and no consumables, maintenance is more convenient and fast. Another invisible benefit of laser marking is that it gives powerful anti-counterfeiting and information traceability functions by marking specific graphic information.
Food packaging bags are mostly made of film and polymer materials, which are very sensitive to heat. In order to avoid scorching that reduces the aesthetics and clarity of the mark, the "cold" processing characteristics of 355 nm UV DPSS are desirable. 355 nm UV DPSS photon energy is high, and the material has a high absorption peak at 355 nm, so the energy is fully utilized, and the molecular bonds of the material can be easily broken during marking, and the heat generated in the whole process is low. To be minimal, the pulse width of about 25ns is of great significance to the heat-affected zone. The narrow pulse width makes the heat conduction on the surface of the material to end before it is too late, and the specific performance is that the heat-affected zone is very small. In this way, there is no charring and clear lines when marking with 355 nm UV DPSS on video packaging bags.
355 nm UV DPSS also has the property of being easy to focus. Under the blessing of excellent beam quality (M2 < 1.2), the diameter of the focused spot can reach the order of microns. In this way, very fine and complex graphics can be carried out on the packaging bag. The marking output not only has high contrast and high resolution, but also has certain anti-counterfeiting and traceability functions, which is self-evident for food safety.
