Image bleeding as mug cools down

[Daveb]

Hi!

I'm printing some mugs with a black ring around the top and bottom of the mug, and a couple of images and some text in the centre.

I've backed the rings away from the edges as I was getting fading on some of the prints. Got to the point where the print was coming out clear and sharp. Went for a celebratory cup of tea, and when I came back noticed that there was a tiny bit of bleeding on 1 or 2 parts of the rings, and on 1 mug some very slight bleeding on the text. It is just a tinge, and it doesn't show up on photo, but it is noticeable in real life.

Could it be because I am not pressing for the right time - too short or too long?

Should I be cooling the mugs in water as soon as I remove the paper?

With the mug press, should I let the temperature drop to the resting temperature before putting in the next mug?

All advice welcome!

Dave

[NASH]

dunk the mugs as soon as they come out of the press in luke warm water

[Daveb]

dunk the mugs as soon as they come out of the press in luke warm water

Nash,

Good news, bad news. The ring didn't bleed, but the mug cracked

My water was the warmer side of luke warm, so I'm not sure why that happened.

I noticed that the bleed area is more or less in the same place each time. I'm thinking it might be a cool spot on the wrap. I've lowered the hight of the mug in the press, and moved the handle as far to the the right as I can, I'm going to try upping the pressure a bit, and extending the press time.

What do you think?

Dave

[Lee]

I always dunk with the paper attached for 20 secs or so straight after pressing, never had a cracked one yet, so not sure what could have caused that - perhaps you using too much pressure, but Im sure one of the 'oldies' will know '-)... The dunking or cooling down should stop any bleeding though...

[Paul]

if you dunk your mugs you will in 99% have some crack ones sometimes they dont crack just like that. Sometimes you can hear funny sound like a "ping" this is cracking inside the mug. So mug dont actualy need to falling in bits.

Dave, Do you taking paper of stright after mug is out of the press?

[NASH]

Dave i press for 180 seconds at 180* whip the paper straight away and dunk in luke warm water and i`ve never had a cracked mug, but i must say i use mugs from BMS. Could it be the mugs rather than what you are doing?

[Daveb]

I always dunk with the paper attached for 20 secs or so straight after pressing, never had a cracked one yet, so not sure what could have caused that - perhaps you using too much pressure, but Im sure one of the 'oldies' will know '-)... The dunking or cooling down should stop any bleeding though...

Nash,
Dropped the pressure a little, but also dunked with the paper still on. It gave me a good result, now to do a few more to check that it wasn't a flook!
Dave

[Daveb]

if you dunk your mugs you will in 99% have some crack ones sometimes they dont crack just like that. Sometimes you can hear funny sound like a "ping" this is cracking inside the mug. So mug dont actualy need to falling in bits.

Dave, Do you taking paper of stright after mug is out of the press?

Paul,
Usually I do take the paper off straight away and don't dunk. Really I am just trying to overcome the black ring bleeding slightly as the mug cools - could too much pressure be causing this?
Dave

[Daveb]

Dave i press for 180 seconds at 180* whip the paper straight away and dunk in luke warm water and i`ve never had a cracked mug, but i must say i use mugs from BMS. Could it be the mugs rather than what you are doing?

Nash,
My mugs aren't from BMS - but my next ones will be.
I had raised a query on here before as to how much variation in a batch of mugs was to be expected. I've noticed that the pressure can vary noticeably between mugs, because of the slight variations in diameter. Also, when I touch 2 mugs side by side, I can see gaps and bumps of up to 1mm between them - slightly more at the top and base. The sides are slightly waved instead of straight. Is this reasonable?
Dave

[John G]

Where your mugs from?

I don't dunk - I put a fan on the work bench set to cool and just place the mug in front of it after taking the paper off. By the time the next mug is ready the first ones cold.

I used to dunk but as Paul said, they ping a little - and that cannot be good for the mug.