355nm UV nanosecond laser marks finely on plastic bottle caps, clear and beautiful

Bottle caps made of plastic materials can be seen everywhere, and are common in mineral water bottles, beverage bottles and sauce bottles, etc., and are an important part of the beverage packaging industry. In addition, the position of the bottle cap is special, and consumers are accustomed to verifying relevant information on the bottle cap, so manufacturers choose to "make a fuss" on the bottle cap - marking information, including but not limited to brand logo, anti-counterfeiting code, production batch number, production Dates, expiration dates, even QR codes, etc.

In the past, marking information on bottle caps was mainly done by inkjet, which is intuitive and low-cost. However, the shortcomings of inkjet are obvious. Not only is it easy to fade over time, but it is also very easy to be tampered with. As a result, problems such as counterfeit goods and regional cross-selling have emerged one after another, which has troubled manufacturers.

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With the gradual deepening of the application of laser marking and the superiority of laser marking in anti-counterfeiting performance and traceability, it has become the consensus of many manufacturers to carry out high-quality laser marking on plastic bottle caps, and they have purchased suitable marking machines to integrate into production line.

The industrial-grade nanosecond solid-state laser developed and designed by RFH has the characteristics of excellent beam quality, wide repetition frequency and high marking effect.

First of all, the output 355nm UV laser has high single-photon energy and high bond energy, which can easily break the chemical bonds between polymer materials and realize cold processing. The ultra-short pulse width (less than 20ns) can be used in plastics, which are sensitive to heat On materials with high sensitivity, it can effectively reduce the thermal effect and reduce the heat-affected zone, and the carbonization degree is very low, which makes the marked symbols and characters very clear. It has excellent beam quality (M2<1.2). After the beam passes through the focusing system, the diameter of the spot reaches the micron level, which is much thinner than a human hair. The marking effect is delicate and beautiful. The repetition frequency is from single pulse to 500kHz, which is suitable for flexible application by manufacturers.

Moreover, the laser marking mark penetrates deep into the surface of the plastic bottle cap, which is very durable and not easy to be erased.