Atomizing pressuse, thinner content and pot life is all important to keep
webbing under control but the problem with adding more thinner is that
it's difficult to keep the minimum dry film thickness which is something
of a challenge with 1B73 and 1B31 in the first place.
And yes, 905 is even worse.
I have little experience with the PVA coater but we've had an SCS for
almost 9 years which is in principle quite similar except for the special
atomizing nozzle on the PVA. A major challenge with 1B73 was (and is) to
control air bubbles in the coating and at the same time get a reasonable
thickness, webbing is much less of an issue.
Cheers, Grunde
Mike Sewell <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
06.02.2009 15:41
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Mike Sewell <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] Coating material
Try adding more thinner to eliminate the webbing. The 1 to 1 on their
datasheet is just a starting point.
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ted Tontis
Sent: Friday, February 06, 2009 8:26 AM
To: [log in to unmask]
Subject: Re: [TN] Coating material
Grunde,
The HumiSeal 1B73AP is supposed to reduce the occurrence of webbing,
that's
why it was original chosen. Now that we switched over to the 1B73 we are
seeing signs of it and trying to stay on top of it. We reduced the
atomizer
a little to try to keep it to a minimum, I am not sure how much that is
going to help. I have seen worse on one of our other coaters spraying
HumiSeal 905. We are currently using a PVA coater and spraying it on.
Ted
_____
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Friday, February 06, 2009 2:01 AM
To: TechNet E-Mail Forum; Ted Tontis
Cc: [log in to unmask]
Subject: Re: [TN] Coating material
Hi
Small air bubbles and cobwebbing are familiar issues with these
materials.
Do you use spray or filmcoating?
Cheers, Grunde
Is anyone currently using HumiSeal 1B73AP mixed with 521 carrier in a
automated process? If so have you noticed any coating issues?
Thank you,
Ted Tontis CID
Quality Engineer
Borg Indak, Inc.
701 Enterprise Dr
Delavan, WI 53115
C 262-949-8887
P 262-245-3060
F 262-728-3788
[log in to unmask]
www.borgindak.com <http://www.borgindak.com/>
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