For this method, the plastics absorb the laser energy.

Laser transmission welding offers an attractive alternative option to weld plastics where traditional plastic joining technique fails. Lumogen ® IR 765. Laser welding of plastics is now a convenient and flexible technique that is proving popular for joining automotive parts and medical equipment as well as consumer products.

Transmissive plastics Where two transmissive plastics are to be joined, the traditional approach is to use a carbon black absorber, but today there is a clear product called Clearweld that absorbs infrared. Today, after more than a decade of significant research effort, laser transmission welding is a well-established joining technology, and it even seriously challenges processes with an older "tradition" for plastic joining, such as adhesive bonding or ultrasonic welding. This technology is also known as laser transmission welding.

The transparent material is placed on top of the absorbent material and clamped. Laser transmission welding (LTW) is effective and efficient for welding of acrylics or other polymer materials [54][55] [56] [57][58][59]. Laser transmission weld in 4mm thick polypropylene using a 100W Nd:YAG laser at a speed of 1.6m/min. In many industrial sectors, laser transmission welding of plastics has become established as a production process. The melt zone is approximately 0.3mm thick .

Lumogen ® Black K 0087 Lumogen ® Black K 0088.

Transmission laser welding of thin and thick materials is therefore possible where a transmitting plastic overlays an absorbing plastic. Several laser welding methods are available and depend on the materials you need to weld. Laser plastics welding has proven its reliability in numerous applications where rigid parts are welded together ([5], [6]).

The thermoplastic shows a previously unachieved laser transparency in the range of 900 to 1100 nm – at a consistently high level. Process-optimized Diode Lasers for Laser Transmission Welding of Polymer For many years, LIMO‘s diode lasers have been used to weld plastics in various different fields, such as the automotive industry, medical technology, the production of white goods (household appliances) and many others.

Laser-transmission welding rapidly joins thermoplastic parts without vibration or excess heat.

This results in a method of welding plastics that does not use mechanical vibration and does not mark the outer surfaces of the component. Welding plastics using laser technology not only reduces the use of consumables, it also produces very good quality results compared with other welding techniques. For the purpose of welding of foils the energy deposition can follow the transmission welding process, where the laser energy is irradiated through one of the welding partners and absorbed in the second layer. The Technique: Laser transmission welding of thermoplastics requires both a polymer that is transparent to the laser beam and one that is absorbent. In the actual fusion process, the laser beam gets through the transparent component without significantly heating it up.

Most plastic materials that can be welded using traditional means can also be welded using one of our laser methods: Heat conduction welding.

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