we are thinking about printing on non woven polypro totes and arent exactly sure how to go about it. 

what kind of ink would be used?  if plastisol then how would it be cured?  it seems as if a conveyor dryer would be too much heat for the polypro and likely melt it?  as would a flash we assume...?

is a waterbased ink used or is the polypro stuff just not worth printing on at all?

any help is appreciated.

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i just printed on some of those bags for our shop; as give-a-ways.  one thing to remember is that those bags are not going to be washed so making sure that the ink is at its fullest cure temp is not necessary.  also, even if you use light ink or dark bags, do not flash them.

we used regular plastisol ink, cut the dryer temperature by about half, raised the heating core about 12inches above the bags and sped the dryer belt up a considerable amount.

i think you are really going to have to just test a few and expect some waste until you figure out your correct settings.  If the bags come off the belt and the ink is still a bit to tacky I would have slowed the belt down a bit and tried again.  Once the ink felt like it wasn't going to stick to itself I let them go.  I melted 2 bags right off the get-go and after that I was able to dial in my settings.

Though I eventually got it to work fine, for the few extra pennies (.20) or so, I switched to using the canvas bags.  I can keep all my dryer settings the same and not worry about melting anything.

It is a special ink.  Wilflex has the ink and the mixture.  I purchased mine from Freedom Supply here in Atlanta.  The ink cures at a lower temperature. 

if the customer orders them, then i agree with brad and royster.

however, i had a customer drop 1000 of these bags on me so I had to figure out how to print them which brings it back to the original question on how to print them. 

special ink, lower temp.  I had to reduce the oven temp and speed up the belt to accomplish the appropriate curing point.  if you are off, the bag will curl up in a ball, catch on fire, and melt.   

When we sell them directly, we let someone else do it. We are contract printers though, and when we do them for our contract customers, we have a clear primer that we spray on them, send them through our gas dryer at 250 fairly fast, then print them with NazDar 9500 series multi purpose air dry inks. A bit more of a pain, but it's been our best thing yet. And the ink is there to stay. I tried a waterbased product a couple of months ago that was highly recommended by some of the board members, but we hated it completely. Others have had good results with it, so maybe we were impatient, but when we do it our way, no problems at all.