help with vastex exposure unit

By djmp360 on Sep. 08, 2011

I am new at screen printing and i am having alot of trouble exposing screens using the vastex e2331 unit with the Ulano QLT emulsion. No matter what i do it seems to be over exposed and hard to wash the stencil out. Can someone please help.

Submitted by sben763 on Thu, 09/08/2011 - 18:26

Re: help with vastex exposure unit

What mesh. 100 Should be 60-75 sec with your exposure unit. 156. 45sec. 305. 20-35

Were you exposing longer?

Submitted by djmp360 on Thu, 09/08/2011 - 18:48

Re: help with vastex exposure unit

Yes the tech support guy from vastex told me 2-6 min!!! He said he was burning a screen right this second on the same unit, that did not work for me.

Submitted by sben763 on Thu, 09/08/2011 - 18:56

Re: help with vastex exposure unit

You are way over exposing. These times are from ulano using a 40w exposure. You may have to step test to find your best result. I personally use the s.e.x emulsion from performacescreensuppies. Or hifi from silkscreen supplies and have similar exposure times on my exposure unit as the ulano

Submitted by djmp360 on Thu, 09/08/2011 - 18:57

Re: help with vastex exposure unit

OH yea you asked what mesh i used. Im using 110 mesh.

Submitted by djmp360 on Thu, 09/08/2011 - 18:58

Re: help with vastex exposure unit

Thanks alot for your help, im going to burn a screen right now.

Submitted by sben763 on Thu, 09/08/2011 - 19:00

Re: help with vastex exposure unit

Report your results please

Submitted by Binkspot on Thu, 09/08/2011 - 19:43

Re: help with vastex exposure unit

Get an exposure calculator and follow the directions. It will take the guess work out of exposing your screens. Use it to check the exposure time every so often or when you notice a change in how the screens blow out. It also pays to wet the screen and let it set for a min or two then wash the image out.

Owner/Operator of Middletownink

Submitted by djmp360 on Thu, 09/08/2011 - 20:22