-----Original Message-----
From: Jane Koh [mailto:[log in to unmask]]
Sent: Tuesday, November 07, 2000 3:38 PM
To: [log in to unmask]
Subject: [TN] Manual Stencil Cleaning


Hi everybody,

The IPC Stencil Cleaning Task Group, 5-31g, is currently working on a new
document - IPC-7526 "Stencil and Misprinted Board Cleaning Handbook".  On
behalf of the task group leaders, Kantesh Doss, Nokia Telecommunications,
and Mike Bixenman, Kyzen Corporation, I would like to invite input from the
industry on the cleaning of stencils and misprinted boards using manual
techniques.

We would really appreciate if you could share with us how you manually
remove solder paste and uncured SMT adhesive from the underside of stencils
and misprinted PWBs:-
1.  What manual cleaning instruments/accessories do you use?
  Paste: Saturated wipe, Spatula,
  Adhesive: Q-tip with Saturated wipe or dip & brush

2.  What chemistry do you use?
  Paste: Smart Sonic 440R
  Adhesive: Petroferm Hydrex A+
  Are you using the same type of cleaning media for removing solder paste
and uncured adhesive?
  No.

3.  What is you maximum allowable time lag between a print step and the
removal of
  Solder paste: 4hrs
  Adhesive: 1hr

4.  At what temperature do you perform you stencils/misprinted boards
cleaning?
  23C

5.  How often do you clean your stencils?
  After job is run. 10+ stencils per day are cleaned.

6.  What are the pros and cons of the method you are using?
  Laborious, time consuming and quality is operator dependent

7.  Would you consider changing to an automated system?
Paste stencils are currently being run in an automated system, above manual
cleaning is to remove majority of paste prior automated cleaning.



Mike Barmuta

Staff Engineer

Fluke Corp.

Everett WA

425-356-6076


You may submit your input to me at [log in to unmask]  Thank you in advance
for your generosity in sharing your knowledge and experiences.

Cordially,
Jane Koh
Technical Project Manager
Staff Liaison for the IPC Stencil Cleaning Task Group

Tel : (847) 790-5349
Fax: (847) 509-9798
E-mail : [log in to unmask]

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Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
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Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
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