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Speed Drying In Kiln?


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#1 Biglou13

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Posted 23 June 2014 - 05:20 PM

This was mentioned in another post, I've read a little about it.

To those unaware, Basically it's taking fresh made pots, or not bone dry pots to bone dry stage and even onto bisque stage using kiln.

To those who have done it. What is your schedule/ instruction when speed drying?

How risky is this endeavor?
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#2 Colby Charpentier

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Posted 23 June 2014 - 05:42 PM

Using a preheat when bisquing is standard practice, pushing the limits as far has how much moisture is still in the work is a judgement call, but the largest factor of success is how well made the work is...



#3 Pres

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Posted 23 June 2014 - 06:52 PM

Lou, I have had some limited success with speed drying to bisque. I got the idea from using a downdraft blower/filter table in my classroom. These tables could speed dry a pot in 4 hours without cracking as long as the joins were strongly made. The air would circulate around the pot and from under the pot as the table was a screen of sorts made of masonite. I tried speed drying pots at home using the kiln, and found that I had cracking problems in the base of the pots. Then I tried adding foot rings and cutting the ring into pieces so air/moisture/heat could get around the entire pot. With an all day drying, and a slow bisque 100% success on all pieces in the load. I stacked the load in tumble manner so that air and moisture could get to all the pieces.larger pieces all had the mentioned foot rings.


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#4 JBaymore

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Posted 23 June 2014 - 07:17 PM

I've done a demo at school of loading fresh thrown wet pieces.... just dry enough to load without having trouble handling them... and firing them up.

 

The key is keeping the humidity in the chamber very high and the temp just below 212 F (100C) but circulating a lot of volume.  Gas kiln with a "wet" flame is important.... not easy in an electric.

 

Industry does this all the time... the units are called driers.  Temperature and humidity controlled units.  Look them up.  They work better than a kiln.... they are designed for it

 

Using the kiln to do this for us is more of a "gimmick" than a useful strategy...... unless one time it gets you out of a deadline jam ;) .

 

best,

 

................john


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#5 Mark C.

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Posted 23 June 2014 - 09:00 PM

I have handled pots and loaded them into a gas car kiln wet-Its easier with non handled forms as I have also done them as well.

The best results is when kiln is still hot from a fresh unload (glaze fire) and interior is still hot. This works real well

Its as John says keep it under 212 degrees-pots dry right out

after the steam is gone its back on schedule with speed.

 

I have also done this many times in my old school skutt 1227

with a old school fire right controler set at 8 on the dial with lid cracked open 3 inchs

8 means in 8 hours its all three element on full. I close the lid when steam stops coming out. 

Do not put your wet pots low in an electric-middle to upper for best chance-The bottom seems to get hot later but faster later and tends to blow them more.

The only reason I can see this is for production and time frame needs as in last minute.

I try to work smarter these days but also know what the limits are.

Most do not know the limits.I say find them at least to know about them.

So many fire the kiln at a snails pace. Its good to know how fast things really can go.

Mark


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#6 JBaymore

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Posted 23 June 2014 - 10:06 PM

Speaking of speeding things up........ in case people reading this thread have never seen this kind of stuff..............

 

Here is why as a handcraft ceramist you simply can't "win" the Walmart buyer price point battle:

 

http://www.youtube.c...h?v=uMD9T6O6bWk

 

http://www.youtube.c...h?v=w7Tk_7_9qck

 

http://www.youtube.c...h?v=LBJVmLTdF_k

 

http://www.youtube.c...h?v=PQ36tG1mXs8

 

http://www.youtube.c...h?v=M-QkWsrZSzc

 

Think of making the work special rather than fast. You can't compete with automation on the speed front. Do what it can't.

 

best,

 

..................john


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Professor of Ceramics; New Hampshire Insitute of Art

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#7 Benzine

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Posted 23 June 2014 - 10:39 PM

Interesting videos John.... Though I could have done without the Kenny G in the first one.  I felt like I was on an escalator in a department store.

 

I have to say, the automated glazing set up was pretty impressive.  I may have to invest in one of those....

 

I agree, we do have to make things special.  Nearly every year, that i have been teaching, I have made mugs, for Graduation gifts.  The students are always thrilled to get them, because they know I made them.  I can't imagine what their response would be if I handed something I just picked up in a "Megamart".


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#8 clay lover

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Posted 24 June 2014 - 07:50 AM

unfortunately, your buying public often can not tell the difference.  I have spent years trying to teach my customer how to choose their pottery and how to tell if it was machined or not..






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