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Date: | Wed, 08 Jan 97 17:44:56 cst |
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Our thoughts on 'swell' rollers
Dave Sullivan
Rockwell Collins, Inc.
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Subject: Re: FAB:Roller swelling
Author: pmcarter at po5
Date: 1/8/97 5:31 PM
Yeah, my first hunch would be either the antifoam (some of the
early ones were notoriously loaded with butyl or other glycol ethers
as an "extender") or the proprietary developer solution. Some
proprietary developer solutions have a glycol ether or a similar
organic "extender/stabilizer" to make it look like it can stand a
higher loading factor (more square feet of resist per gallon). You
don't mention whose ThermoPlastic Elastomer was used to mold the
roller sleeves (DuPont's Alcryn is one possible candidate), but if
you can find that out, they, or Chemcut, might be able to help you
sort out the chemical incompatibility.
Of course when the developer still appears to develop, but has a
viscosity approaching that of blue maple syrup, it is entirely
possible to have a rinsing issue or two, especially as the city water
temperature drops.
There are/were organic constituents in some of the resists, that
in concert with one of the materials above, might be expected to swell
some synthetic elastomers
Marc Carter,ex-resist person
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Subject: FAB:Roller swelling
Author: ddsulliv at po6
Date: 1/8/97 4:31 PM
What do you think about this. I've seen it on stripping solutions and
antifoam 86 from Dynachem.
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Subject: FAB:Roller swelling
Author: [log in to unmask] at ccmgw1
Date: 1/8/97 3:10 PM
I recently encountered a problem with a Chemcut developer's (series
2000) rollers. The rollers were coated with TPE rubber. The rollers
swelled up allowing the aluminum core to spin freely, obviously not
allowing boards to pass through the machine. It is unclear as to what
caused this problem. Several factors have been changed within the
last 3 months. A new developer solution has been in use on a feed and
bleed system. Two new anti-foam chemistries were tried. A new film
was evaluated for about 2-3 weeks. Of these changes, does anyone have
experience with a similar problem, and could you identify any
potential incompatibility issues. I would rather not list the
specific vendors, but would like to know if a specific chemical
reaction might cause this. Thanks in advance.
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