The golden partner of food packaging bag marking - pulsed 355nm UV nanosecond laser

When two packs of food are placed on the shelf, and the information on the packaging bag of one pack is clearly marked, while the label information on the other pack is blurred or even falls off, how will consumers choose?

The answer is obvious. Not only that, the production date and shelf life on food packaging bags are erased, tampered with, and the prevalence of counterfeit and knock-off products is even more difficult for consumers to guard against. The emergence of these situations not only requires manufacturers to suffer economic losses, but also severely damages their brand image. Therefore, how food manufacturers provide consumers with reliable products has become the focus of daily production.

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The traditional marking process on food packaging bags is mainly carried out by ink jet coding, and the information is not limited to the production date, shelf life, batch number, production place and other information. However, the disadvantage of ink jet coding is that it is easy to fall off, become blurred, and be easily tampered with over time. For example, some unscrupulous merchants erase the original production date by recycling products that are about to expire, and then spray a new date. Continuing to sell in the market will not only bring serious hidden dangers to the health of consumers, but also cause trouble to the market.

The in-depth application of laser marking is one of the keys to improving the quality of food packaging boxes and achieving quality control. Compared with traditional ink jet coding, the marking on food packaging bags is very clear, permanent, not easy to fall off, not to mention tampering, with anti-counterfeiting function, and can also be used to trace the source of food, effectively preventing smuggling, At the same time, the packaging bag does not produce any toxic gas during the marking process, and no new pollutants are introduced, which is very environmentally friendly.

So, how to choose the right laser? This starts with the material and marking effect of the packaging bag.

Food packaging bags are often made of plastic, PE film and special polymers (polyimide, etc.) used for FPC matrix materials. These materials are very sensitive to heat and are easily deformed if heated. Therefore, to obtain high-quality marks, an RFH 355nm UV solid-state laser with cold working effect can be used.

There are three reasons: first, most materials have a high absorption rate of 355nm ultraviolet light, which is easier than absorbing infrared light; second, for the materials used in food packaging bags, the photon energy of 355nm ultraviolet laser can be used to directly destroy the chemical bonds of materials, The purpose of peeling and removing material is achieved by photochemical reaction, which is regarded as cold processing. With a very narrow pulse width (less than 20ns), the processing heat-affected zone is small, no thermal effect will occur, and no material scorching problem will occur; Third, the beam quality is good (M2 <1.2), and the spot of ultraviolet light is small, so the diameter of the spot after focusing can reach 10-20um, the marking of graphic information is thin, and the accuracy is high, from marking simple numbers to complex two-dimensional code graphics can be Competent, and the focused beam has a very high energy density, which can process materials more efficiently.

In addition, this laser is smaller in size and more refined in design, which is very easy to integrate into the assembly line. It has very high stability and can easily adapt to 7*24h marking operations, which greatly improves the production efficiency and meets the requirements of industrial production.

Because it is closely related to people's lives, food packaging has received much attention. With the in-depth application of laser marking applications, customized information is marked on packaging bags, which further enhances the added value of products and contributes to the construction of food health.