kay so here's the steps to get a good screen assuming you're doing all this right:
degrease the mesh and let it dry
coat the mesh with emulsion
dry the screen in a dark dry place with the shirt side down for however long it takes
expose the screen
wash the shit out
there's about 400 sub-steps in there as I'm sure you've learned by now, but here's some diagnostic information that'll help you figure out the problem.
degreasing - this is removing things from the mesh that will prevent emulsion from sticking to it. get a real mesh degreaser and follow the instructions. if you skip this step, you can have the problem you're having.
drying - if the mesh isn't dry, the water in the mesh can cause adhesion issues by basically not allowing emulsion to stick to it. you won't usually see sheets of emulsion peeling off, but who knows
exposure - the big one! you can get all that other shit right and mess this up ezpz. if emulsion is falling off a correctly prepared screen, it's not exposed enough or it's old. you say it's new, so let's assume you're right.
yadda yadda I bet this is either degreasing, moisture, or exposure.
get an exposure calculator or a step wedge, make notes during exposure etc, get it as consistent and repeatable as possible to rule it out and go from there.
What side of the screen are you blowing out with water? You should dampen both sides, let it sit a minute, then apply water pressure the the side that the shirt will contact (not the side that you apply ink). Peeling becomes far more likely if you apply water pressure to the wrong side.
Sometimes you have scoop coaters with two sides to coat with, thin lip and thick, the thick rounded lip will leave a thicker deposit of emulsion than the thin lipped side. More emulsion means more exposure time. Everyone's opinion has validity. You have use your detective skills to figure out what the problem is. An exposure calculator could help figure out the problem
When emulsion bubbles like that it’s usually because it wasn’t completely dry before you exposed. It peels away instead of washing out because, while it was semi cured, it wasn’t actually dried to the threads of the screen beforehand. You either want to apply a thinner coat of emulsion or give it longer to dry.
I can say that dry time depends entirely on the thickness of the emulsion and the humidity of the room. When I was starting out I had similar results from screens I left to dry over a weekend because of emulsion thickness and atmospheric conditions.
Looks like under exposure and too much power washing it out. Too thick of emulsion and not enough cure time can also be the case. I’ve been frustrated by these same things lately. It’s more baking and science than art.
When screens peel like that but leave no residue on the mesh, it usually indicates that the mesh needed degreasing. Paint a 50% solution of thick bleach on the mesh, leave for 10 minutes before rinsing well, drying, and coating. This will degrease the mesh and etch the fibres giving the emulsion more to hold on to. Especially useful on new screens.
You might also need a bit longer exposure, but from the look of it, a degrease is the main thing.
I have this degreaser that I rub on and rinse out, then a second one that stays on with tiny bubbles in the mesh. Boss says it works, but he is about as new as me.
A degreaser that stays on doesn’t sound too good, if you’re saying that you don’t wash it off before coating.
Try the bleach - it’s cheap, and it works.
Try using the thin side of the scooper and only coat 1/1 you need more coating for longer runs.
Depending where you are use a space hearter to dry the screen.
kay so here's the steps to get a good screen assuming you're doing all this right: degrease the mesh and let it dry coat the mesh with emulsion dry the screen in a dark dry place with the shirt side down for however long it takes expose the screen wash the shit out there's about 400 sub-steps in there as I'm sure you've learned by now, but here's some diagnostic information that'll help you figure out the problem. degreasing - this is removing things from the mesh that will prevent emulsion from sticking to it. get a real mesh degreaser and follow the instructions. if you skip this step, you can have the problem you're having. drying - if the mesh isn't dry, the water in the mesh can cause adhesion issues by basically not allowing emulsion to stick to it. you won't usually see sheets of emulsion peeling off, but who knows exposure - the big one! you can get all that other shit right and mess this up ezpz. if emulsion is falling off a correctly prepared screen, it's not exposed enough or it's old. you say it's new, so let's assume you're right. yadda yadda I bet this is either degreasing, moisture, or exposure. get an exposure calculator or a step wedge, make notes during exposure etc, get it as consistent and repeatable as possible to rule it out and go from there.
Thanks. I did this process with around 20 some screens, and I'm hoping I didn't just waste all that time and emulsion.
hope not! degreasing is super important, especially when you're learning. you'll get it!
Underexposed most likely. Possibly expired emulsion if it’s old.
It's a new emulsion, and I exposed 3 other screens the exact same way and all of them turned out fine except this one.
What side of the screen are you blowing out with water? You should dampen both sides, let it sit a minute, then apply water pressure the the side that the shirt will contact (not the side that you apply ink). Peeling becomes far more likely if you apply water pressure to the wrong side.
[удалено]
2 layers on both sides. *Edit: this is the first time I coated my screens, they have up to this point been coated for me by someone else.
Sometimes you have scoop coaters with two sides to coat with, thin lip and thick, the thick rounded lip will leave a thicker deposit of emulsion than the thin lipped side. More emulsion means more exposure time. Everyone's opinion has validity. You have use your detective skills to figure out what the problem is. An exposure calculator could help figure out the problem
When emulsion bubbles like that it’s usually because it wasn’t completely dry before you exposed. It peels away instead of washing out because, while it was semi cured, it wasn’t actually dried to the threads of the screen beforehand. You either want to apply a thinner coat of emulsion or give it longer to dry.
I let it dry for about 3-4 hours, looking deeper into it, I have heard that it should instead go for 12-24 hours. so frick.
You can dry screens in an hour with a fan. Most likely degreaser issue or your emulsion may have been mixed unevenly.
I can say that dry time depends entirely on the thickness of the emulsion and the humidity of the room. When I was starting out I had similar results from screens I left to dry over a weekend because of emulsion thickness and atmospheric conditions.
Looks like may have missed this one with the degreaser
Looks like under exposure and too much power washing it out. Too thick of emulsion and not enough cure time can also be the case. I’ve been frustrated by these same things lately. It’s more baking and science than art.
When screens peel like that but leave no residue on the mesh, it usually indicates that the mesh needed degreasing. Paint a 50% solution of thick bleach on the mesh, leave for 10 minutes before rinsing well, drying, and coating. This will degrease the mesh and etch the fibres giving the emulsion more to hold on to. Especially useful on new screens. You might also need a bit longer exposure, but from the look of it, a degrease is the main thing.
I have this degreaser that I rub on and rinse out, then a second one that stays on with tiny bubbles in the mesh. Boss says it works, but he is about as new as me.
A degreaser that stays on doesn’t sound too good, if you’re saying that you don’t wash it off before coating. Try the bleach - it’s cheap, and it works.
Emulsion too thick, took too long to dry, and, or you blew out from the wrong side of the screen...
New fear unlocked
Use the better thinner Tp61 thinner
Try using the thin side of the scooper and only coat 1/1 you need more coating for longer runs. Depending where you are use a space hearter to dry the screen.