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February 2007

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Subject:
From:
"Kane, Amol (349)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kane, Amol (349)
Date:
Fri, 2 Feb 2007 14:50:19 -0500
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Hi Steve,
Humiseal tape works good with some coating and leaves residues with others. We use the Scotch tape material 4737T, which works good with acrylics (including 1B31) and urethanes, and comes off clean even after the coating is fully cured. We have been using it for a while now and have not had any problems with tape residues yet.

Amol Kane
M.S (Industrial Eng.)
Process Engineer
Harvard Custom Manufacturing, Inc. 
941 Route 38  Owego, NY 13827
Phone: (607) 687-7669 x349
Fax: (607) 687-9733
[log in to unmask]
www.harvardgrp.com

 -----Original Message-----
From: 	TechNet [mailto:[log in to unmask]]  On Behalf Of Douglas O. Pauls
Sent:	Friday, February 02, 2007 12:47 PM
To:	[log in to unmask]
Subject:	Re: [TN] Humiseal Masking Tape Residues...

Steve,
That appears to me to be tape that has not been removed from the board,
rather than any residues from the adhesive.  I have used the Humiseal tape
with success and have not seen these kinds of failures when the tape is
removed while the coating is wet.  If you allow the coating to dry or be
tack free, then you get these kinds of problems.  I would expect you to
have the same problem with other kinds of tape.

Doug Pauls



                                                                           
             Steve Gregory                                                 
             <SGregory@OAIELEC                                             
             TRONICS.COM>                                               To 
             Sent by: TechNet          [log in to unmask]                     
             <[log in to unmask]>                                          cc 
                                                                           
                                                                   Subject 
             02/02/2007 11:30          [TN] Humiseal Masking Tape          
             AM                        Residues...                         
                                                                           
                                                                           
             Please respond to                                             
              TechNet E-Mail                                               
                   Forum                                                   
             <[log in to unmask]>                                             
             ; Please respond                                              
                    to                                                     
               Steve Gregory                                               
             <SGregory@OAIELEC                                             
               TRONICS.COM>                                                
                                                                           
                                                                           




Hi All!

I have a conformal coat masking problem too along with KennyB. We're
getting residues from the Humiseal tape we're using when we remove the
tape.

We're coating the boards with 1B31, and we don't bake the boards with
the tape on. We take the tape off right after we spray the board. Check
out:

http://stevezeva.homestead.com/files/Tape_Residues.jpg

I've not had this problem with Humiseal tape before. Our customer is
rejecting the boards and it is quite time consuming to remove these
residues.

I've got a call into Humiseal to see if they can help. Do any of you use
any other tape for masking that doesn't leave residues?

Have a great Friday!

-Steve Gregory-

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