Mike Gordon on sat 18 sep 04
Hi,
I found this .... surfing. "Throwing Classical Porcelain in Jingdezhen,
China" scroll down the list of articles on this website =
http://www.ceramicstoday.com/. until you find it. I'm always in deep
respect for anybody who can stand throwing anything larger than a
coffee cup in porcelain anyway & these guys are truly amazing! We've
discussed this method of using several lumps to end up with a large
lump to throw before, but never in porcelain that I can remember,
anyway. Lots of other good info in the other articles as well, Mike
Gordon
Christy Pines on thu 23 sep 04
To me, there are 2 things interesting about the article. The writer states:
Containing no ball clays and thus having little plasticity, classical
Jingdezhen porcelain is an adventure to throw. The general rule is to
throw thick walled pieces and, when thoroughly dry, trim both the inside
and outside to desired thickness. As much as half the body will be
trimmed away.
Two things: plasticity due to ball clay and trimming away both inside
and out to create desired thickness.
I'm still in my discovery of the plasticity thing, trying to answer
Ivor's questions (did some research today in the corporate library, book
titled Ceramic Science for Material Technologists by I.J. McColm, ISBN
0-412-00351-1- fascinating information on sheet silicas and how water
molecules for ice-like layers around the hexagonal platey crystals of
clay as a source of plasticity), but also am intrigued by the trimming
part. As a newbie, I try not to have to trim away in order to achieve
large and thin at the same time, but maybe my efforts are misplaced.
christy in connecticut
cpines at ix.netcom.com
Mike Gordon wrote:
> Hi,
> I found this .... surfing. "Throwing Classical Porcelain in Jingdezhen,
> China" scroll down the list of articles on this website =
> http://www.ceramicstoday.com/. until you find it. I
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