Depending on the situation you could put down a layer of ink then flash it at the proper flash temp...then lay down another layer of ink on top of that. This is used to help light colors on a dark shirt show better. If the incorrect flash temp is used then the top layer can flake of...but it does not sound like you used multiple layers of ink. If that is the case then I would guess that you did not cure it at the correct temp in the conveyor.
just went and got my temp gun. i know its easy. just point and shoot. but what exactly am i looking for? where do i shoot it? while its under the flash or right after. do i let it cool before? its a whole new thing for me to learn and there is so MUCH more to this t-shirt stuff than most could imagine. its easy once you learn it all but the journey seems a little trying at times. thanks
Measure it as it is flashing (under the flash). Like Troy said, once it gets to 220, stop flashing. Keep track of the time for a few of them, then you can go by time and not have to measure everyone with a gun.
Measure them at the very end of the oven on the conveyor. Should be above 330, but not too far above. Adjust the belt speed faster or slower as needed.
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