Views: 42 Author: Site Editor Publish Time: 11-05-2021 Origin: Site
Nowadays, in response to environmental protection requirements and lightweight trends, plastic products are gradually replacing metal parts in industrial products. As parts of industrial products, welding is inevitable. However, traditional plastic welding technology has many drawbacks. With the development of laser technology, plastic laser welding technology has also been widely used. Today Leapion Laser shares the application of laser welding machine in the field of plastic products.
Because of the traditional welding technology, grooves are prone to appear in the transition position of the weld, or the weld penetration directly affects the quality of the entire workpiece, and some problems such as cracks, deformation, bubbles, and chromatic aberration due to different welding materials or processes .
However, laser welding uses high-energy laser pulses to locally heat the material in a small area. The energy of the laser radiation diffuses into the material through heat conduction, and the material is melted to form a specific molten pool. It is a new type of welding method, mainly for the welding of thin-walled materials and precision parts.
Laser welding is a vibration-free welding technology, so it is particularly suitable for precision-processed electronic components such as mice, mobile phones, connectors, and complex parts that need to be welded in a cleaner way, such as those containing circuit boards. Plastic products, medical equipment, etc.
In the medical field, laser welding technology can be used to manufacture liquid storage tanks, liquid filtering equipment, hose connectors, ostomy bags, hearing aids, implants, microfluidic devices for analysis, etc.
1. Studies have shown that the transmittance of polymers to near-infrared lasers is at least 20-50%, and laser welding technology can be used to obtain excellent welding results. Most natural plastics and many colored translucent plastics can meet this light transmittance requirement. In other words, laser welding can be applied to most plastics.
2. The laser can also weld the plastic film together. It moves along the edge of the film to form a packaging structure by bonding. The operation process can be completed very quickly.
3. On the other hand, the absorption rate of near-infrared laser by plastic is also an important factor affecting the effect of laser welding.
Most thermoplastics can greatly increase the absorption rate of laser by adding an appropriate amount of carbon black, but for some materials, the application of laser welding still has certain limitations. For example, if both materials are transparent or white, the near-infrared laser can be transmitted through, so that the absorption of the near-infrared laser by the material is extremely low. In this case, laser welding cannot be used.
Another typical example is PPS and LCP plastics. The two materials have very low transmittance to near-infrared laser. If the two materials are filled with carbon black at the same time, laser welding cannot be performed because the laser cannot penetrate.
In addition, many mineral-filled compounds are not suitable for laser welding. In order to overcome these limitations of laser welding, some plastic manufacturers have actively researched and developed new materials that can help improve laser transmittance and absorption, and have achieved gratifying results. The progress of the laser welding technology has brought a broader application prospect.
For other information and inquiries about laser welding machines, please contact Leapion Laser directly.
