Lighter patches - DF30

[justme]

I have just purchased a DF30 from printerowners and am getting to grips with it!

I have just printed a batch of coasters (jpg attached) and some of them have lighter patches on them. Really hard to capture on a photo. Do you think it was the length of time I pressed them for? They were the 100x100mm unisub ones and I pressed them 190 for 60 seconds. Or perhaps the pressure? I have run out of blanks to experiment with - more on order.

When you tape the paper to the coaster, do you wrap the tape around ? I wonder if some of it is where the tape was?

Arghhh...anyone?

[Paul]

was there any plastic film on them? if so... did you removed it? what time and temps you use??? have you pre press them before final press?

PAul

[justme]

No plastic film... (not that I can see anyway!) I did 190 for 60 seconds.

What do you mean by pre press? No I just stuck them in and did them for the 60 secs...

4 out of 9 came out OK!...some from each of the 2 batches of 4 were OK...

[Paul]

i sometimes prepress to get rid of extra misture. is worth to flip them up side donw and give them 10sec to dry them out. coll them down then press them with your graphic.

[justme]

Oh, OK, thanks Paul.

I probably just need to experiment further...the blue one was the one that showed the problem up the worst.

Have ordered 30 coasters, so hopefully I'll get to grips with it without too much more wastage!

Cheers, Charis

[Andrew]

Did you print them individually or all at the same time? Unless you have a very good press I would keep it to a max of 4 at a time. It can be excessive moisture if there are too many under there and haven't had a pre-press as Paul mentioned. Personally, I find that unisub coasters benefit for a high temp so wouldn't be afraid of going for 200c for 60s as you can get a great print from them. Go with a firm pressure as well.

[justme]

Thanks for this - I pressed 4 at a time, with mixed results each time. When I get my new batch of coasters, I'll have another play and experiment with a pre press and, perhaps, a higher temperature. Thanks again for your help

Charis

[WorthDoingRight]

Might be an uneven pressure issue which might be fixed by the use of a silicon sheet between the coasters and the press. A lot of pressing issues relate to the variations in thickness of items and a good silicon sheet can help see item below:

http://www.ebay.co.uk/itm/X-Large-Silic ... 460170f855

Richard

[Paul]

Personaly i wouldnot use silicon with coasters.

[Ian M]

Charis, you need to pre press them for 20 seconds to get rid of any moisture that's in the coasters. I would also print them one at a time to begin with using medium pressure. This video will give you a good idea of what to do even though it is a clock she is pressing. The clock is the same material as the coasters so, don't worry too much about that. It also gives you a good idea of what kind of pressure she is using too. http://www.youtube.com/watch?v=C60L1WUeVc4