At present, there are only a few suitable for the processing of perforation on food packaging bags, laser perforation technology is now very mature, can be perforated on any material processing, it can solve some traditional mechanical processing sector can solve the problem.

Mentioned above, the use of laser punching perforation on food packaging bags better, because most of the food packaging bags are plastic, and in the process of plastic processing will be thermally expanded, the coefficient of thermal expansion is much larger than the metal, a long time after the heat will be significantly reduced, long-term at room temperature after the force, in the lower yield strength, there will be a long period of deformation, very sensitive to damage to the cut. Therefore, special attention should be paid to the processing of small hole products, a careless deformation and large melt edge phenomenon will occur.

The use of laser punching method does not need to consider such problems, plastic laser punching machine belongs to the non-contact processing method, is the use of laser speed adjustment focus as a high intensity heat source to the material heating, so that the laser action area material melting or vaporization after evaporation, the formation of holes. Using the lens focus, the laser beam is highly concentrated in space and time, which can reduce the spot diameter by 10 times of 5 times ~ 10 times of 15 times W/cm2 laser energy density. Such high power density makes it possible to punch holes with laser in any material. The characteristics of uniform hole diameter, good finish, no burr and no molten edge.

The laser is a kind of laser using high energy laser with power density of l07-109W/CH, which acts instantaneously on the material and the action time is only 10-3-10-5s, and the laser punching speed is very fast.