How long do I expose photo emulsion?
Stronger lights will require less time to develop, perhaps as little as 15 minutes depending on conditions. Using unfiltered UV black lights, it only takes 5 minutes. This is the recommended exposure chart for Speedball brand photo emulsion.
How long does it take screen printing to dry?
about 20 minutes
Can you over expose photo emulsion?
Over-exposure causes a loss of detail in your image area. When photo emulsion is exposed to UV light, it polymerizes or will crosslink, making it more difficult to wash out. … Extreme over-exposure can “burn” through the opaque areas of the film positive rendering the stencil a solid block of hardened emulsion.
How long is emulsion good for?
Can you dry emulsion with a hair dryer?
Use a Hair Dryer or Heater
If you need to quick-dry paint on furniture or walls, use a hair dryer to speed up the process. … Instead of waiting around for each layer of paint finish to dry, you can speed up the process to quickly move on to the next coat of paint.
How long does it take speedball ink to dry?
PROCEDURE: After allowing the ink to air dry overnight, I put the towel directly in my household dryer on high heat for a timed dry of 40 minutes. After heating the towel in the dryer for one 40 minute cycle, I did the wash test.
What temperature does plastisol cure?
They will not dry, or cure, at normal temperatures. For a complete cure, they must reach 290-330º F (143-166º C). Plastisol inks can be printed on virtually any surface that can withstand the heat required to cure the ink and is porous enough to permit good ink penetration.
Does photo emulsion go bad?
The instructions on the speedball photo emulsion say that without refrigeration it will go bad after mixing the sensitizer, in one month, if refrigerated it will last 6 months.
How do I know if my emulsion is bad?
You can’t really tell by looking (as long as it was sealed). If the emulsion doesn’t perform like it used to and you increase your times and still can’t get a good burn, then most likely it’s bad. You can place the emulsion in a refrigerator to make it last longer.
Why does my emulsion wash off?
If you’re using a pressure washer, make sure you’re not getting the nozzle right up close to the screen. The emulsion is a bit soft from the water, and can blow out with enough pressure even where there was exposure.
Do you need emulsion for screen printing?
INK. The type of ink you’re using does affect which kind of emulsion you’ll need. For presensitized emulsions, only some of them works for all inks. Depending on the ink you’re using, you’ll need to look for an emulsion that’s either water-based, discharge, or solvent resistant.
How long should you expose your screen?
At 12″ high, 4 minutes with a 500w halogen worklamp should give a good image although it will also depend on the specific type of emulsion used among others. 7-9 minutes should be more in line with what is referred to in this industry as the proper exposure time with a better durability for your stencil(emulsion).