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Dual laser coating apparatus and process

  • US 7,661,387 B2
  • Filed: 01/31/2005
  • Issued: 02/16/2010
  • Est. Priority Date: 01/30/2004
  • Status: Active Grant
First Claim
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1. An apparatus for coating a substrate with a powdered polymer, comprising:

  • a first laser producing a high power non-modulated output directed to a first area of the substrate with the powdered polymer provided on the substrate, the substrate provided in an open environment, said first laser heating the powdered polymer to a lower melt temperature;

    a second laser producing a modulated power output directed to an area on said substrate smaller than said first area, the modulated power output of said second laser is smaller than the non-modulated power output of said first laser, said second laser heating the powdered polymer to a temperature greater than said lower melt temperature, but lower than an upper melt temperature; and

    a thermal feedback system, sensing the temperature of the powdered polymer and/or the substrate and wherein the thermal feedback system is configured to modulate only the power of said second laser based upon said upper melt temperature.

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