Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Stencil Cleaning

Views: 1288

Stephen

#46470

Stencil Cleaning | 3 January, 2007

We will cleaning the Stencil after screen printing for 3 or 5 or 7 panels. I want to ask how to define the Stencil cleaning frequency?

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#46480

Stencil Cleaning | 4 January, 2007

1) determine the rate of cleaning frequency related defects your production can tolerate. 2) determine the frequency that nets you that defect rate, or lower, but also consider the cost of cleaning materials and throughput if you're cleaning very often.

When I had a fully auto inlne printer I just stood out there on the line and watched the inspection cycles to determine how often to clean. Usually it was every 1-2 cycles for 16 mil pitch, every 2-3 cycles for 20 mil pitch, and 5-10 cycles for larger pitch.

With semi-auto printers now I just tell the operators they have to do the touch up on insufficients/bridges and let them decide. ;)

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#46481

Stencil Cleaning | 4 January, 2007

Here is a great thread on the various stencil cleaning technologies available:

http://www.smtnet.com//forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=3026&#Message12325

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#46482

Stencil Cleaning | 4 January, 2007

Incoming! *ducks*

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Stephen

#46610

Stencil Cleaning | 11 January, 2007

Thanks all

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