Author Topic: Stencil thickness and coating techniques  (Read 1165 times)

Offline Rockers

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Stencil thickness and coating techniques
« on: February 28, 2016, 07:22:13 PM »
How would you describe the difference in stencil thickness in regard to certain coating techniques. For example a 150-S mesh coated 1/1 with the round edge compared to a 2/2 coat with the sharp edge. Would you say the difference is a lot or rather insignificant or a massive difference ?  Judging by how much emulsion we had left in the scoop coater doing a 2/2 sharp edge coat on 10 screens compared to a 1/1 round edge I would say there will be a noticeable difference but I would like to get some more opinions on that.


Offline jvanick

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Re: Stencil thickness and coating techniques
« Reply #1 on: February 28, 2016, 07:39:46 PM »
I would say get a thickness tester.  Your results even with a 1/1 will likely shock you.

They sure did with me.  1/1 round on a 150s will result in 50% or more EOM in our shop.

Offline ericheartsu

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Re: Stencil thickness and coating techniques
« Reply #2 on: February 28, 2016, 07:44:10 PM »
I still don't correctly understand how to measure and calculate the EOM. could someone explain?
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Offline jvanick

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Re: Stencil thickness and coating techniques
« Reply #3 on: February 28, 2016, 07:50:27 PM »
Eom is the percentage of emulsion over the mesh.

Measure the mesh only, then measure the thickness of the emulsion on the mesh.

Use the formula

(Emulsion - mesh thickness) / mesh thickness

Will give you the percentage.

Ie:

I measured my emulsion thickness at 90 microns

I measured my mesh at 60 microns...

( 90 - 60 ) / 60 = .5

You can also shortcut by doing ( Emulsion thickness / mesh thickness )

90/60 = 1.5

Or 50% eom.
« Last Edit: February 28, 2016, 07:55:30 PM by jvanick »