John Baisch on thu 18 mar 99
Hello All,
I have been having consistently problems with firing large tiles (8" x
8") in reduction at cone 10.
They are consistently curling during firing. I am using a tile setter
that holds 8 horizontally.
Does any one have any ideas or suggestions?
John Baisch
jbaisch@micron.net
Erik on fri 19 mar 99
John,
How are you preparing your clay? If you are treating like you would when
you throw, you will always get curl. You have line up the clay molecules
to be a flat thing. In other words, don't wedge in a spiral. Bring your
clay together flat and create several layers of horizontal platelets.
Think about making really fine puff pastry.
In cooperation,
Erik Riese
~~~~~~~~~~~~~~~~~~
mailto:erik@tao.ca
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Bill Palmer on tue 23 mar 99
At 06:14 PM 3/18/99 EST, you wrote:
>----------------------------Original message----------------------------
>Hello All,
>
>I have been having consistently problems with firing large tiles (8" x
>8") in reduction at cone 10.
>They are consistently curling during firing. I am using a tile setter
>that holds 8 horizontally.
>Does any one have any ideas or suggestions?
>
>John Baisch
>jbaisch@micron.net
>
>John,
When you say you are using a tile setter that holds 8" horizontally, do you
mean the type that suspends the tiles only on the sides? If so, most clay
bodies at cone 10 will sag as the clay body softens. At that temperature,
you should be firing on a flat shelf that supports the whole tile. If you
are already firing on a flat shelf, you might try drying the tile between
plaster bats. The water is taken out uniformly during drying, not allowing
either side to dry out too quickly. I have known some people to slightly
bend their tile opposite to the way that they warp, so that in the firing
the tiles sag into a relatively flat form. As various others have
mentioned, differential thermal expansion plays a role as well, so trying
different glazes is a good idea. Good luck, I think flatness is a tile
maker's biggest hurdle.
Bill Palmer
Bill Palmer
Technical Support Manager
ClayPeople
112 Ohio Ave., Richmond, CA 94804
Toll Free 888-236-1492 ext. 324
Local 510-236-1492 ext. 324
Fax 510-236-2777
Email ceramic@slip.net
http://www.claypeople.net
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