Infrared plastic welding with recirculation of unabsorbed infrared laser light to increase absorption of infrared laser light
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United States of America Patent
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Jan 24, 2012
Grant Date -
Nov 6, 2008
app pub date -
May 5, 2008
filing date -
May 4, 2007
priority date (Note) -
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Abstract
Unabsorbed infrared laser light that has passed though plastic parts to be welded with a low absorption TTIr process is recirculated back to the low absorption weld interface for reabsorption in the process. A beam of infrared laser light is directed at the plastic parts to be welded, a transmissive first part and an absorptive (or partially absorptive) second part. The infrared laser light impinges the transmissive part and first transits through the transmissive part to be welded to a weld interface at the junction of the two parts. At the weld interface, either the infrared laser light is partially absorbed by an additive infrared absorber, the infrared laser light is partially absorbed by the absorptive part, or both. The portion of the infrared laser light that is not absorbed continues through the absorptive part and exits the far side. This infrared laser light is then redirected back to the weld interface.
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