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June 1997

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Mon, 30 Jun 1997 16:20:55 -0500 (CDT)
From [log in to unmask] Wed Jul 2 08:
28:55 1997
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Subject:
Idents and HASL
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David Arivett <[log in to unmask]>
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>From buetmi Mon Jun 30 16:
02:39 1997
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I would recommend applying idents after HASL. Hot air leveling takes the
board well above its glass transition temperature and them cools it pretty
rapidly. Typically this can cause some distortion in the panel. If a thermal
cure ink is used for idents and the panels are cured horizontally, the
boards are slowly brought to a temperature just above the glass transition
temperature and then cooled slowly. This helps minimize the distortion
sometimes seen on fine pitch product.

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