what am i doing wrong? using chromablue emulsion... and is this stuff safe?
trying to expose a screen with chromablue emulsion... first timer but this thing stinks... i am worried because i have pregnant wife at home...well i was trying to wash out an image but it won't wash off completely... messed 2 screens already i am on my third screen now... first 2 i did 1 coat only but third one i am doing both sides... exposed it for 30 minutes with unfiltered flourecent(not black light)... i am really concered about pregnant wife and these chemicals...
re: what am i doing wrong? using chromablue emulsion... and is this stuff safe?
Quote:
Originally Posted by hoonami
trying to expose a screen with chromablue emulsion... first timer but this thing stinks... i am worried because i have pregnant wife at home...well i was trying to wash out an image but it won't wash off completely... messed 2 screens already i am on my third screen now... first 2 i did 1 coat only but third one i am doing both sides... exposed it for 30 minutes with unfiltered flourecent(not black light)... i am really concered about pregnant wife and these chemicals...
So....are you concerned you can't properly expose or your pregnant wife?
Either way, check the MSDS sheets on the emulsion. It shouldn't be too bad. This is one of the reasons I refuse to screen print at home. But anyway, just take precautions and ventilate.
re: what am i doing wrong? using chromablue emulsion... and is this stuff safe?
Quote:
Originally Posted by hoonami
it's both... sorry for the newbie Qs but what is msds?
i don't see burned image on a screen after exposing it, does it mean i should burn it longer?
Could be your light source if you don't see an image on the screen. Make sure your films are opaque enough also, otherwise it may be exposing the image too.
MSDS = Material Safety Data Sheets. Your supplier needs to be able to provide these to you.
re: what am i doing wrong? using chromablue emulsion... and is this stuff safe?
Quote:
Originally Posted by hoonami
sorry for the newbie Qs but what is msds?
Material Safety Data Sheet; it lists the tech specs for your product, but more importantly it lists any safety and handling precautions that need to be taken. Information about flammability, what to do in the event of a spill, health risks, what to do if you're exposed, etc. etc. OSHA requires that they be available to all employees.
As a one person operation, for your own sake you still need to read these for every product you use.
I've rarely seen chemical warnings related to pregnancy, but there are definitely some.
I strongly believe everyone owes it to themselves not to start printing until they've read the relevant MSDSs.
re: what am i doing wrong? using chromablue emulsion... and is this stuff safe?
thanks guys... went to their website and found instruction and msds,
but still haven't found much on health concerns that i have for my wife...
i am gonna buy 500w halogen working lights from homedepot tonight and try it
on manufacture's website they said expose it for 40sec with 5kw(guessing it's 5000watts)
so if i get 500w halogen(quartz bulb) should i multiple it 10 times? so burn it for 400sec(about 6min 40sec)?
re: what am i doing wrong? using chromablue emulsion... and is this stuff safe?
I would start off with 12 - 14 minutes for a starter burn...and see how it burns..and adjust from there....also do yourself a favor and get a 21 step wedge test....and put it on every screen you burn for the rest of your career..
Re: what am i doing wrong? using chromablue emulsion... and is this stuff safe?
I use Imagemate Photopolymer emulsion, and one issue I had early on was with the screen getting exposed by natural light prior to exposing on the light table.
So make sure you are doing your screen coating, drying and exposing is a very dark work area. This type of emulsion is very light sensitive.
Dual cure emulsion doesn't seem to be so light sensitive, but for the type of light source you're using, I think the Photopolymer is the way to go. Dual cure might take much longer to expose.
Re: what am i doing wrong? using chromablue emulsion... and is this stuff safe?
Quote:
Originally Posted by provision
I use Imagemate Photopolymer emulsion, and one issue I had early on was with the screen getting exposed by natural light prior to exposing on the light table.
So make sure you are doing your screen coating, drying and exposing is a very dark work area. This type of emulsion is very light sensitive.
Dual cure emulsion doesn't seem to be so light sensitive, but for the type of light source you're using, I think the Photopolymer is the way to go. Dual cure might take much longer to expose.
True, we use dual cure emulsion. My darkroom got over filled so I took the exposure unit out into our production area with natural light coming through, I can expose fine without worrying about natural light. Dual cure is more forgiving which is why we use it. I expose 110 in about 1 min and 305 in about 30 secs.
Re: what am i doing wrong? using chromablue emulsion... and is this stuff safe?
Guru what dual cure do you use? I'm trying Murakami blue photopolymer right now, it's fast and holds good detail, and more solids so it gets far less pinholes.
I actually washed a 156 out with 55lpi halftones with a pressure washer- worked pretty good.
Re: what am i doing wrong? using chromablue emulsion... and is this stuff safe?
When I was having trouble finding PC701 by imagemate . . . the reps were telling me that the chromablue is almost the same stuff. So when I got a test quart and coated 1/1 and burned at my regular time which is 3 minutes. Worked out great. So depending with light source . . . I would try 2 to 5 minutes . . . also depending on height!
Re: what am i doing wrong? using chromablue emulsion... and is this stuff safe?
Quote:
Originally Posted by out da box
Guru what dual cure do you use? I'm trying Murakami blue photopolymer right now, it's fast and holds good detail, and more solids so it gets far less pinholes.
I actually washed a 156 out with 55lpi halftones with a pressure washer- worked pretty good.
We use CCI dual cure (SWR Water resist). We were using CCI DXP dual cure (for plastisol) but that thing was so fragile.
After switching to the SWR, we can use it for both plastisol and waterbased without hesitation. No pinholes and no troubles with halftones (which the DXP gave me trouble with). We now also washout our stencils with the powerwasher and it gives great crisp detail. The SWR also dries faster.
The only downside of the SWR is that it's harder to breakdown during reclaiming. Instead of using a mixture of emulsion remover of 30% water and 70% concentrate, we now use 100% concentrate. But I like the trade off.
This is a discussion about what am i doing wrong? using chromablue emulsion... and is this stuff safe? that was posted in the Screen Printing section of the forums.
what am i doing wrong? using chromablue emulsion... and is this stuff safe? 
