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Wirestripping Procedure using Visible Laser Radiation and Dye Doped Insulation

IP.com Disclosure Number: IPCOM000108360D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 57K

Publishing Venue

IBM

Related People

Brannon, JH: AUTHOR [+4]

Abstract

Disclosed is a laser process for precision stripping of insulation from fine wires using pulsed YAG laser radiation in conjunction with a suitably absorbing dye added to the insulation.

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Wirestripping Procedure using Visible Laser Radiation and Dye Doped Insulation

       Disclosed is a laser process for precision stripping of
insulation from fine wires using pulsed YAG laser radiation in
conjunction with a suitably absorbing dye added to the insulation.

      Polyurethane, an organic insulating polymer, does not strongly
absorb visible light.  As such, pulsed laser ablation of this
material for wirestripping applications only occurs when using very
large intensities of visible laser radiation.  These large
intensities often produce poor stripping since thermal and mechanical
shock, melting, and charring accompany the removal process.  However,
by doping the insulation material with a suitable dye in the proper
concentration, the absorbance can be increased dramatically. As a
result, much lower intensity visible laser radiation can be used to
precisely and cleanly strip polyurethane wire insulation.

      In the case of Q-switched, frequency doubled Nd:YAG laser
radiation at 532 nm, doping the red dye Rhodamine 6G into the
polyurethane insulation provides for efficient wirestripping (1).
Rhodamine 6G not only possesses a strong absorption at this
wavelength, but also high thermal and chemical stability.  Further,
when used in concentrations between 1 and 10%, the mechanical
integrity of the polymer matrix is not compromised.  Red dyes other
than rhodamine 6G were also found to enhance wire stripping; however,
this dye proved to be superi...