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Under cure for sure. That is a thick print and if you only getting 320-340 at the surface its not curing fully. Slow the belt way down and turn the temp up. Think of curing ink like a cake. If you only get the top and bottom to 350 the center is raw. On a shirt all the heat comes from overhead so the ink on the bottom is uncured. Since your dryer is short you may even try to run them back though inside out to ensure a full cure.
 
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Edward, really sorry to see you had this problem.
for that much ink to wash out that quickly you were really under cured.

Get a temperature gun and check every run - that is the best insurance.

Also don't be afraid to had your dryer temp really up there.

There is a misconception about drying temperature, yes the INK has to get to 320 degrees, but you might have to get the shirt to 375 in order for the ink to cure properly due to other conditions such as humidity and moisture in the shirt, dark shirts absorb heat, etc.
 

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I cured, I believe over 320temp
What made you believe you cured over 320?
Measuring proper cure temp throughout the entire ink deposit is absolutely critical! The most accurate way is to use a donut probe. A little pricey but WELL worth the investment. Temp guns and temp strips just don't cut it regardless of what you may hear. And overcuring can be a problem as well. And if the fabric is a poly blend, you risk dye migration with higher temperatures.
And read all you can on different inks, their uses and all their particulars and you'll save a lot of trial and error headaches.
 
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