"Food" is at ease, the marking application of 355nm UV laser in the packaging of prefabricated vegetables

Chinese cuisine is rich and varied, and a variety of flavors are very popular. Braised chicken rice, tomato brisket, Kung Pao chicken, garlic crayfish, Hu spicy soup... There are many special dishes from all over the world. However, in the current fast-paced life, it is time-consuming and laborious to complete these dishes in your own kitchen, from preparation to final product, which is not a small challenge.

In addition, affected by the current epidemic, many restaurants do not allow dine-in, and takeaways have many hidden dangers in food safety and hygiene, so pre-made dishes have become popular and become a "sweet pastry" in the eyes of busy office workers, and quickly ushered in rapid growth. Tear off the outer packaging, and the fish-flavored shredded pork, Dongpo pork, sweet and sour pork ribs with all the colors and aromas can be quickly presented on the table after a few minutes of heating.

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What is a prepared dish? It may sound mysterious, but it's actually not that complicated. It is a finished product or semi-finished product processed from agricultural, livestock, poultry and aquatic products, and is hygienically and scientifically packaged and preserved by a series of methods such as freezing or vacuuming. As a convenient special dish on the table, it has the characteristics of convenience, efficiency and stable production.

According to the survey, nearly 30% (29.03%) of consumers expressed their greatest concern about the food safety of prepared dishes. Therefore, in addition to strengthening the control and transportation and preservation of ingredients, the packaging of prepared dishes is also particularly important. There are two main packaging methods for pre-made vegetables, vacuum bag packaging and air-conditioning lock fresh box packaging. They generally use PET/BOPP as the printing film. If the pre-made vegetables are positioned high, three-layer composites can also be used, that is, the outer layer is made of PET. /BOPP, use PETAL in the middle, and then compound a layer of CPP or PE as a heat sealing layer, which plays the role of moisture barrier and gas barrier and prevents deterioration.

After the packaging of pre-made vegetables is sealed, it is often necessary to clearly mark the brand, production date, shelf life, specification number and other information of the product on the outer packaging, so as to have the effect of product traceability and anti-counterfeiting, and prevent the appearance of counterfeit products. The current mainstream marking methods include ink jet coding and laser marking. The ink jet coding technology is mature, but there are environmental pollution problems, and ink needs to be added frequently, and information may easily fall off and be easily tampered with.

The laser marking method is different. Compared with the ink jet coding method, it is more environmentally friendly. It is a permanent mark, not easy to be tampered with, and does not fall off. It has been used in the production lines of many food companies. Integrating the RFH 355nm UV nanosecond laser into the production line of prepared dishes can achieve 7*24 hours of long-term marking, and its beam quality is high (M2 < 1.2), the diameter of the plate after focusing is small, and the recognition degree of the marking is very high , 355nm ultraviolet wavelength + pulse width of about 20ns, such a combination for the outer packaging film, its high single photon energy brings the effect of cold processing, narrow pulse broadband to very small heat affected zone, from marking date to Origin information, as well as pattern decoration, one-dimensional code, two-dimensional code, etc., can meet the needs, help improve processing efficiency and product reputation, allow manufacturers to gain both fame and fortune, and also allow consumers to "eat" with peace of mind.