David Woof on sun 26 sep 10
Joyce=3D2C Help!!!
I just typed "not" instead of my intended "note" in my post responding to =
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Vinces prost to Diana.
From: woofpots@hotmail.com
To: clayart@lsv.ceramics.org
Subject: . Re: Drying Cabinets
Date: Sun=3D2C 26 Sep 2010 09:08:51 -0600
Diana=3D2C
Just a side (note) in support of Vince saying the dehumidifying dryers are =
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a mistake. When considering cost effectiveness and energy consumption=3D3=
B =3D
running a dehumidifying unit is like running your refridgerator with the do=
=3D
or removed.
=3D20
David Woof
______________________--
1a. Re: Drying Cabinets
Posted by: "Vince Pitelka" vpitelka@DTCCOM.NET=3D20
Date: Sat Sep 25=3D2C 2010 5:12 pm ((PDT))
Diana Pancioli wrote:
"I hope someone on Clayart has knowledge of cabinets that force dry ceramic=
=3D
ware.
I know Pewabic has one=3D2C a large metal walk in. Theirs is bigger than I =
ne=3D
ed.
I don't know if theirs is prefab or if it was built for them. I think it wa=
=3D
s pretty expensive."
Diana -=3D20
I think that the dehumidifier would be a mistake. I think that the secret t=
=3D
o fast drying with no cracks is to heat the ware up in a super-humidified a=
=3D
tmosphere and then let the humidity dissipate slowly. The best drying cabin=
=3D
et I have seen was at John C. Campbell Folk School. Their cabinet accepted =
=3D
a full-size Brent ware cart=3D2C and had several short sections of electric=
b=3D
aseboard heater along the lower walls of the cabinet=3D2C and a few small v=
en=3D
t holes bottom and top. That way=3D2C natural convection circulated a small=
a=3D
mount of air. The heat would allow some moisture to evaporate from the ware=
=3D
s=3D2C humidifying the atmosphere=3D2C and the humidity would dissipate slo=
wly =3D
through convection=3D2C as a small amount of air escaped from the top of th=
e =3D
cabinet. In this cabinet we were able to dry all sorts of wares=3D2C thick =
an=3D
d thin=3D2C overnight with no cracking at all.=3D20
I remember that the late Oregon potter Joel Cottet had a special steam-inje=
=3D
ction kiln built by California Kiln Company. He loaded his gigantic wheel-t=
=3D
hrown tables=3D2C chairs=3D2C and hot tubs into this huge kiln=3D2C and the=
early=3D
firing cycle included steam injected into the kiln so that the humidity wa=
=3D
s very slowly lowered as the temperature began to climb. This is an industr=
=3D
ial approach used to avoid cracking when firing large=3D2C thick wares.
- Vince=3D20
Vince Pitelka
Appalachian Center for Craft
Tennessee Tech University
vpitelka@dtccom.net=3D3B wpitelka@tntech.edu=3D20
http://iweb.tntech.edu/wpitelka
=3D20
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