Preheating mug bases

[Martin86]

I generally give my mug (10/11oz) bases about a 15-20 second heat up at about 140c before pressing them at 180c for 30 seconds and it seems to work well for me. This made me curious about just how much you can preheat a mug before ruining it?

If I heat up the entire mug to 180c and above, will this "spoil" it, or does it not matter how high/long the mug is heated for when there is no sublimation paper attached?

[socialgiraffe]

Not sure why you would want to preheat the whole mug, but in answer to your question, it will spoil eventually, but not for several minutes.

15-20 seconds will be fine.

The temperature (in general) will not be the issue as ceramic takes a relatively long while to get to temperature. Meaning although you are placing a mug in for 15 seconds at 180 degrees, in reality the actual temperature would be somewhere around 130-160 degrees depending on the temperature of the room, the mug and also the quality of the heat blanket.

Eventually it will spoil which will yield a similar result to overheating and ultimately turn yellow.

I use ovens now, but when I was using a mug press I had a teriyaki heat plate which worked perfectly for heating the bases (with the print already wrapped and ready to press).

[Martin86]

Thanks for the reply. I don't want to actually do it. I was just curious at what heat/time a blank mug could be spoiled.

[webtrekker]

I have 2 mug presses and used to preheat a mug in one press (at 110 degC for 3mins, WITH THE WRAP ATTACHED!) then swap it over to the other press at 180 deg C for 3mins). These were some of the best prints I've managed to obtain with a press.

Sublimation starts around 160 degC, so leaving the wrap on and heating to 110 degC had no side effects
and solved the problem of trying to affix a wrap to a hot, preheated mug.

[Mrteajunkie]

I don’t preheat and see no reason to as yet.
I tried it once but it made no difference!
maybe I got lucky and have a decent press which makes a difference?

[leealbi791]

I Chucky my mug in at around 140. Let the press heat up with mug in to around 180 then the timer starts for 140 seconds . Comes out perfect.
The paper and ink in my experience are just as important as the press and the mugs you use.
I did use orca glaze mugs until recently , but always had fading at the bottom and edges.
Switched to rhino mugs and A-sub paper and the difference is amazing. Very rarely get a wasted mug .

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[pisquee]

We you a teppanyakki hot plate - room for 10 mugs at a time, so a relatively low setting to just warm the bases, so not too hot to handle the mugs and wrap the transfers no matter how long they are on there for. Helps with printing dark colours full top to bottom.

[webtrekker]

The brand of mugs definitely make a difference. Many mugs taper at the bottom, so the wrap doesn't make great contact with the mug.

[UK Printed Mugs]

We second pisquee and use exactly the same hot plate on lowest setting but ONLY for bone china mugs with design near the bottom or rubbish 10oz mugs when times must. With Xpres 5013 we NEVER need to pre-heat but if we use Listawood or BMS European then we always have to. With low heat setting then the mugs happily sit on here for 5-10 mins.

[logobear]

If you have a hot heat press, - sit your mugs on top of the platten to warm up