Journal
OPTICS AND LASERS IN ENGINEERING
Volume 34, Issue 4-6, Pages 385-395Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0143-8166(00)00071-3
Keywords
CO2 laser; laser welding; industrial laser applications; plastics; plastic films
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Laser welding of plastic materials has a large field of applications in the packaging industry provided that it can compete, in quality and productivity, with currently used industrial methods. Welding of white and transparent thin films of polypropylene and polyethylene of low and high density at high speeds of 20 m s(-1) using a CO2 laser has been studied experimentally. The weld process has been characterised by the specific energy required for each thickness, kind of plastic and the resistance of the weld seam. The influence of the dimensions of the laser beam spot on weld strength has also been analysed. (C) 2001 Elsevier Science Ltd. All rights reserved.
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