Application of 355nm UV Laser in Cutting BOPP Film

BOPP film, that is, biaxially oriented polypropylene film, is a very important soft packaging material and is widely used. The common outer film of toothpaste packaging boxes and medicine packaging boxes is BOPP film. It has the advantages of light and soft, non-toxic, odorless, moisture-proof, high mechanical strength, good dimensional stability, good printing performance, high transparency, etc. It has the reputation of "packaging queen" and is used in food, candy, cigarette, tea, Packaging for juice, milk, clothes, footwear, textiles, books, etc.

As a packaging material, it is inevitable to cut into various shapes according to the needs of customers before use. Some data show that in the current large-scale production of film cutting operations, multiple layers of BOPP films are first stacked together, and then cut multiple times by cutters. For the needs of some specific shapes, it is necessary to replace the die for cutting, or use multiple processes for cutting, which will easily increase the time cost and die cost. In addition, the BOPP film material is soft, and when cutting the film material with a knife, Often wrinkling occurs when one or both sides of the cut are pushed apart, and this is more detrimental when stacks of cut film are used.

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If laser cutting is used, the above difficulties can be avoided. The 355nm UV nanosecond solid-state laser designed by RFH has a shorter wavelength, higher photon energy, shorter pulse width and higher material absorption rate. These characteristics can be well adapted to the application of BOPP film cutting.

First, the 355nm UV laser has a small spot and excellent beam quality (M2 < 1.2). The diameter of the focused spot is only about 20 microns, so fine cutting can be achieved with a small cutting gap; second, the UV laser has a shorter wavelength and higher photon energy. High, when it acts on a specific area of ​​the BOPP film, it can cause chemical bonds in BOPP to break and recombine, the lattice structure is destroyed or the energy level transitions, and part of the film material leaves the body, so as to achieve the purpose of cutting and realize the "coldness" of the BOPP film. Processing; thirdly, its pulse width is very narrow, only about 20ns, there is no thermal effect during processing, no material burning problem, and little damage to the BOPP film. In addition, it also has the characteristics of high cutting efficiency, stable performance of the whole machine, low power consumption, and easy integration in the production line.

The importance of laser is self-evident, and its role in empowerment and efficiency cannot be underestimated. This is also the internal reason why the current laser technology is gradually replacing traditional technology. The performance of RFH 355nm UV laser is reliable and stable, and it is used to cut BOPP film, and the prospect is worth looking forward to.