steve harrison on tue 8 jul 03
Hi Eric
As I understand it, clay improves from wedging because it overcomes the
thixitropia that sets up when the particles are undisturbed. It has
very little to do with aligning particles or air bubbles, for reasons
that there is not enough space to discuss here. I only work up enough
clay to last two hours max, after that it starts to get knotty.
regards
Steve
On Monday, July 7, 2003, at 09:27 AM, Eric B wrote:
> does anyone know, either from experience or "study," for how long a
> time the
> molecular-allignment in clay that wedging causes (making it seemingly
> softer
> and easier to throw) lasts? for example, if i weigh and wedge up a
> palate of
> 5lb balls of stoneware clay body one day AND cover/seal it very well
> with
> plastic (to impede evaporation from outer layers of the balls), how
> many hours/days
> to i have before i'll have to re-wedge it before throwing? or do the
> clay
> platelets remain "aligned" indefinitely?
>
> i know there are other benefits of wedging too, e.g., moisture
> homogeneity ,
> elimination of air pockets, etc., but for purposes of my question it
> is the
> "molecular alignment of the clay platelet molecules" that i'm
> interested in.
>
> thanks all.
>
> eric
> Spun Mud
>
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