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screen printing => Screen Making => Topic started by: Rockers on February 28, 2016, 07:22:13 PM

Title: Stencil thickness and coating techniques
Post by: Rockers 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.

Title: Re: Stencil thickness and coating techniques
Post by: jvanick 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.

Title: Re: Stencil thickness and coating techniques
Post by: ericheartsu on February 28, 2016, 07:44:10 PM

I still don't correctly understand how to measure and calculate the EOM. could someone explain?

Title: Re: Stencil thickness and coating techniques
Post by: jvanick 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.