For Sale

Why won't my screen rinse properly?

Post your questions, suggestions, ideas and advice to issues you have run into in your screen printing shop.

Moderator: Moderator Team

Why won't my screen rinse properly?

Postby ellenchristine » Mon Aug 02, 2010 1:39 pm

I'm new to this forum so bear with me...

Every time I rinse my screen, so matter how gentle or cool the water flow, I always manage to wash away a good part of the burned emulsion and have to go back and touch up with screen filler. After looking at a few posts here, I get the sense it may be my burning method?

Here's what I'm doing now:

I'm using Diablo emulsion. I am just using a basic bulb (a pretty high wattage I think but still just a basic house lamp bulb) and exposing for 45 minutes. Just laying Plexiglass over the transparency.

What am I doing wrong?

Thanks!
ellenchristine
Just Browsing
Just Browsing
 
Posts: 7
Joined: Mon Aug 02, 2010 1:34 pm

Re: Why won't my screen rinse properly?

Postby d fleming » Tue Aug 03, 2010 11:34 am

Wrong light source. Read your info that came with your emulsion and select the proper light.
User avatar
d fleming
Moderator
Moderator
 
Posts: 544
Joined: Mon Apr 03, 2006 3:33 pm

Re: Why won't my screen rinse properly?

Postby ellenchristine » Tue Aug 03, 2010 2:09 pm

I got a Diablo kit and the instructions indicated that a regular high-watt lightbulb would be sufficient, if exposed for 45 minutes. Are there any light sources that seem to work pretty well across the board?

Also, from what I'm reading elsewhere, 45 minutes is a very long time to expose. However, that's what the instructions recommended for this bulb I'm using. Could the exposure time be the problem? Do I just need a different bulb and shorter exposure time?
Last edited by ellenchristine on Tue Aug 03, 2010 2:40 pm, edited 1 time in total.
ellenchristine
Just Browsing
Just Browsing
 
Posts: 7
Joined: Mon Aug 02, 2010 1:34 pm

Re: Why won't my screen rinse properly?

Postby d fleming » Tue Aug 03, 2010 2:40 pm

Unfiltered uv blacklights, Metal halide, carbon arc, the sun, pulsed xenon, mercury vapor, anything but house or flood lights. At 45 minutes of exposure nothing good can happen. And sorry but I've never heard of a Diablo kit. Exactly what kind of emulsion are you using? You may want to go to the manufactureer website and download an exposure table such as this one from ulano for rlx dual cure-

http://www.ulano.com/TechData/RLX.tds.pdf
User avatar
d fleming
Moderator
Moderator
 
Posts: 544
Joined: Mon Apr 03, 2006 3:33 pm

Re: Why won't my screen rinse properly?

Postby ellenchristine » Tue Aug 03, 2010 2:41 pm

I completely got the name wrong - it's the Speedball Diazo stuff I'm using.
ellenchristine
Just Browsing
Just Browsing
 
Posts: 7
Joined: Mon Aug 02, 2010 1:34 pm

Re: Why won't my screen rinse properly?

Postby d fleming » Tue Aug 03, 2010 3:09 pm

Switch light sources, unfiltered uv blacklight flourescents are cheap. When you run out of the speedball stuff, switch to ulano products, you'll be much happier.
User avatar
d fleming
Moderator
Moderator
 
Posts: 544
Joined: Mon Apr 03, 2006 3:33 pm

Re: Why won't my screen rinse properly?

Postby ellenchristine » Tue Aug 03, 2010 3:56 pm

Thanks for the tip! What's a good exposure time range? So 45 minutes is far too high?
ellenchristine
Just Browsing
Just Browsing
 
Posts: 7
Joined: Mon Aug 02, 2010 1:34 pm

Re: Why won't my screen rinse properly?

Postby d fleming » Tue Aug 03, 2010 5:03 pm

Using the proper flourescents and rlx emulsion my time is 4.5 minutes.
User avatar
d fleming
Moderator
Moderator
 
Posts: 544
Joined: Mon Apr 03, 2006 3:33 pm

Re: Why won't my screen rinse properly?

Postby doganonymous » Wed Sep 22, 2010 12:42 am

seems like ur underexposing. I use a cheap 500W halogen light and expose for abt 6-8 minutes depending on the artwork. 45 minutes seems too long..but then again i've never used speedball products.
doganonymous
Just Browsing
Just Browsing
 
Posts: 9
Joined: Wed Sep 15, 2010 2:22 am

Re: Why won't my screen rinse properly?

Postby jesssqueege » Mon Nov 15, 2010 10:40 am

I feel like that is way too long. I've never had to exposed over 15 minutes and I've used Speedball emulsion.
jesssqueege
Just Browsing
Just Browsing
 
Posts: 4
Joined: Fri Nov 12, 2010 4:29 pm

Re: Why won't my screen rinse properly?

Postby rustyjoshy » Fri Nov 19, 2010 6:19 am

i use the same stuff but i got a construction grade halogen lamp. it seems to work great with a 15 to 20 minute exposure
rustyjoshy
Just Browsing
Just Browsing
 
Posts: 2
Joined: Fri Nov 19, 2010 6:11 am

Re: Why won't my screen rinse properly?

Postby tompaine » Fri Nov 19, 2010 10:09 am

The plexiglass is probably uv protected, it is stopping the light.
User avatar
tompaine
Folder
Folder
 
Posts: 271
Joined: Wed Mar 04, 2009 3:38 pm

Re: Why won't my screen rinse properly?

Postby taglessthreads.com » Tue Jan 31, 2012 2:42 pm

Sounds like you need a better exposure unit. Or just use sunlight to expose your screens. Start at 30 seconds with the film facing the sun. If the emulsion seems to hold better than adjust the time for the next screen.
Screen Printing - Tagless Threads
User avatar
taglessthreads.com
Intern
Intern
 
Posts: 77
Joined: Thu Apr 02, 2009 4:08 am


Return to Problems & Issues

Who is online

Users browsing this forum: No registered users



info to advertise here