[OG WOLPH]

Was wondering if you could over expose a screen & what would be the results? Im using a work light & leaving it for 20 min. So far I've done 2 screens & no problem. What would happen if I left it longer? Would it ruin the screen? How would I know if Im leaving it too long???

 

[superD70]

When your image will not wash out or you start loosing fine detail you have exposed too long

 

[beanie357]

Yes you can.
Suggest an exposure test film for testing times.
Better burn=better stencil with detail and toughness, with easier washout.

 

[TYGERON]

Was wondering if you could over expose a screen & what would be the results? Im using a work light & leaving it for 20 min. So far I've done 2 screens & no problem. What would happen if I left it longer? Would it ruin the screen? How would I know if Im leaving it too long???

Too long it won't wash out properly.

Don't let screen exposure be a roll of the dice. Get an exposure calculator and figure it out more accurately.

Use it on all your exposures for consistency.

 

[OG WOLPH]

I see! I think Im leaving it too long! It comes off but seems like its hard to come off! Have no experience in this so wasn't sure what to look for. I will do a test see if maybe 10 or 15 min. Should be enough. I was scared to leave it less time so I was trying 20 min. Maybe a little longer! Likely the screens came out.

 

[TYGERON]

Your times will vary with humidity, bulb age, mesh count, stencil thinkness and other variables.

Get the calculator.

 

[beanie357]

Repeat after me:

I will order an exposure calculator.
I will order an exposure calculator
I will order an exposure calculator.

 

[Bernzomatic]

Repeat after me:

I will order an exposure calculator.
I will order an exposure calculator
I will order an exposure calculator.

Does he really need to spend the money/time and order an exposure calculator? I found a great calculator on these here forums and printed it out in a minute. Worked perfect.

 

[TYGERON]

I found a great calculator on these here forums and printed it out in a minute. Worked perfect.

And of course you're going to post he link to that post, right?

 

[Bernzomatic]

And of course you're going to post he link to that post, right?

Of course! I was in a rush to leave and will post it asap.


edit: Here it is: http://www.t-shirtforums.com/blogs/brojames/271-step-wedge-exposure-calculator.html

 

[Print Officer]

When we use TC ink on big orders we tend to post harden once the screen has been washed out and dryed and spotted over and dryed again. 120 secs to post harden it. Then we are good to go for hours.

When we run more than 2 colours with TC this is a must for us, not doing so, or forgetting can be a big cost when it all goes wrong. LoL.
When it comes to mass production that is!

I always ask our screen department if post harden has be done before any Texcharge job goes on.

Best to be safe.

Sent from my GT-I9100 using T-Shirt Forums

 

[TYGERON]

Of course! I was in a rush to leave and will post it asap.


edit: Here it is: T-Shirt Forums - Uncategorized

exposure-calculator.html

That's cool as heck. That'll work well with stepping or exposing each section.

This does it in one shot:

http://www.t-shirtforums.com/screen-printing-equipment/t184455.html

 

[TYGERON]

There are emulsions considered multi purpose. But if using waterbase discharge inks, it's recommended to use an emulsion specifically for waterbase and discharge inks.