For micro-clean rooms used as transport containers for wafers, the lid and base are welded together by high-power diode laser. This calls for about 50 W laser output and can be obtained with the Fisba FLS iron laser system that achieves a welding speed of around 50 mm/sec. To increase throughput, laser output can be increased. There is a linear relationship of welding speed to laser output: if output is 200 W, speed increases fourfold. The benefits are manifold: in clean environments, it is essential that no particles become detached during the welding process, as may happen in ultrasound welding. It also avoids the undesirable generation of vapor, as produced by many adhesives. And because the welding process can be adapted by programming of the X,Y, Z-axes, joints and container design are also very easy to realize.
EPP EUROPE 444
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