Marking application of 355nm UV laser in Mara tape

Mara tape, also known as silicone Mara tape, fire cow tape, Mara tape, is a high temperature and high pressure flame retardant insulation made of polyester film (PET Film) as the base material and coated with acrylic polymer pressure sensitive adhesive Adhesive tape, with a thickness of about 0.1mm, is a single-sided tape. It is widely used in the insulation of the electronic industry, such as the insulation wrapping of various motors and electronic components such as transformers, motors, capacitors, etc., and can also be used for lithium battery wrapping. The wrapping between the board and the cell plays the role of fixation, insulation and fire prevention.

Nowadays, the material anti-counterfeiting traceability system in the electronic industry has become popular, and it is not uncommon to mark the surface of the Mala tape on the outer layer of electronic components. In the past, traditional labeling or automatic ink jet coding was mainly used for marking. The disadvantage of the two is that with the increase of age and high temperature environment, the label is easy to fall off, causing potential safety hazards, or the coding is easy It becomes vague and loses the meaning of anti-counterfeiting traceability.

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Laser marking is more advantageous. It is vaporized directly on the surface of the object by a high-energy density beam, and it is a permanent mark, which cannot be erased, has no consumables, and has high marking efficiency.

There are many types of lasers that can be used for marking. According to the characteristics of polyester film, the 355nm ultraviolet nanosecond laser (5W) with "cold processing" is used in the laser marking scene application of Mala tape.

The single photon energy of 355nm ultraviolet light is high, and with the pulse width of 25ns, the heat affected zone is very small, which greatly reduces the thermal deformation of the material; its beam quality is high (M2<1.2), and the focused spot diameter is small, which can reach About 10um, some tiny electronic components can be marked with text, graphics, images, barcodes, two-dimensional codes, product serial numbers, autographs, etc. The boundaries are clear, and it is easy to realize the identification and traceability of one item and one code; at the same time, The high flexibility of laser marking can also easily mark some special-shaped components, which truly maximizes the value of the marking.