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Corona-treated polymer surfaces - life-time of application ?
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Dr.Guenter Beyer
Jan 9, 2000, 3:00:00 AM1/9/00
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Hallo....
can anyone make a comment about the life-time of corona treated
polyethylene surfaces :
- how long will such a surface be activated for reactions like
adhesion under normal conditions ?
- any comments about the life-time in correlation to increased
temperature ?
- which solvents or gazes that must be avoided ?
- any further practical remarks how to handle corona-treated
polymers ?
Thanks for help ...
Günter Beyer
Rolf Wissmann
Jan 9, 2000, 3:00:00 AM1/9/00
to
Due to their non-polarity polyolefins like PP or PE do require surface
treatment prior to adhesion or printing. The conditions of the treatment one
needs depends on the specific grade of PE, since additives like lubricants
influence the effectiveness of Corona-treatment. Some additives migrate to
the surface with time and change surface energy as well. For good adhesion
PE requires a surface energie of 39-45 mN/m. As a rule of thumb, one week
after a Corona-treatment surface energy drops by 3 mN/m and after another 6
month by another 3 mN/m. However, surface contaminations like dust, oil,
grease, condensation of water or lubricants accelerates this decay and it
therefor depends on the original degree of surface energy after your
Corona-treatment when the surface energy has dropped below a critical level
for YOUR application. Best is to use the "correct grade" of PE for
acceptable Corona-treatability and to involve a Corona-treatment specialist.
You may also have to conduct some own Corona-treatment- & adhesion- tests
under real production conditions. At -> http://www.4thstate.com/ and ->
http://www.tigres.de/Englisch/downloadsen.html you find some technical
information and references to publications on plasma treatment.
treatment prior to adhesion or printing. The conditions of the treatment one
needs depends on the specific grade of PE, since additives like lubricants
influence the effectiveness of Corona-treatment. Some additives migrate to
the surface with time and change surface energy as well. For good adhesion
PE requires a surface energie of 39-45 mN/m. As a rule of thumb, one week
after a Corona-treatment surface energy drops by 3 mN/m and after another 6
month by another 3 mN/m. However, surface contaminations like dust, oil,
grease, condensation of water or lubricants accelerates this decay and it
therefor depends on the original degree of surface energy after your
Corona-treatment when the surface energy has dropped below a critical level
for YOUR application. Best is to use the "correct grade" of PE for
acceptable Corona-treatability and to involve a Corona-treatment specialist.
You may also have to conduct some own Corona-treatment- & adhesion- tests
under real production conditions. At -> http://www.4thstate.com/ and ->
http://www.tigres.de/Englisch/downloadsen.html you find some technical
information and references to publications on plasma treatment.
"Dr.Guenter Beyer" <gbe...@euregio.net> schrieb im Newsbeitrag
news:3heg7scl0kt1m455j...@4ax.com...
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