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  1. #1
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    Crack sound and blue lines inside mug

    Hi everyone,

    When I remove the mug from my press, I can hear a little crack sound. The mug stays intact but I can see some blue shadowed lines inside it. Again, no breaks, no visible cracks, just those lines. I'm attaching some photos.

    Do you know if it's a weird behaviour and what could be causing it?
    Attached Images Attached Images

  2. #2
    Administrator Justin's Avatar
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    Which mugs are you using? What press/time/temp etc?
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    Hi Justin,

    AA grade orca coated mugs, 200 °C 201 seconds, high pressure... Press is a Chinese multipress

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    Hi, temp is a bit high and time is a bit long in my opinion. I use Orca mugs at 175-180c for 180 seconds. Although I have never been able to crack a mug as such through increased temp / time. Only other thing I would suggest is to ensure the mug is warmed before inserting into the press, this reduces a sudden change in temperature which can cause hairline cracks.

    Alex

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    Administrator Justin's Avatar
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    .... And remember you don't need a very high pressure, as long as blanket is making good contact with mug all the way around, it should close with just a little force.
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    Those lines are cracks. Did you sort it? if so what was it?

    as already said Warm the bottom of the mug before pressing, Try reducing the temp and time. I use a chinese 5 mug press, temp is 170c for 160 seconds.
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