craig edwards on tue 8 aug 06
Taylor-- Harry Davis has a chapter in his book about building filter presse=
s
The Potter's Alternative. It is a book worth having
Cheers
~Craig
On 8/8/06, Taylor Hendrix wrote:
>
> Bruce,
>
> As you well know, the industrial filter presses like the one which
> dewaters David's beloved Black Jack are monsterous devices and work on
> high pressure pushing the slip into the filter bags.
>
> I have read about a much smaller, hand made filter which uses low
> pressure to suck the slip through the filter bags. I wish I knew
> where I read that, but I'm sure someone on the list will chime in
> here. I do believe plans were included. Unlike the cast iron models,
> this one was made partially of wood I think. The low pressure
> approach made this possible. I have always thought I would build one
> of those things, so someone remind me where I read about it.
>
> No matter how one removes excess water from blunged clay, it is still
> the best way to mix clay. But I've only mixed clay two ways so far
> and my fingernails are really long these days...
>
> Taylor, in Rockport TX
>
> On 8/8/06, Bruce Girrell wrote:
> ...> But a key element in this preparation method is the filter press.
> Where do
> > you come up with one of these babies? Not something that you see listed
> on
> > eBay every day.
> ...
>
> > How is a filter press built?
> ...
>
>
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pdp1@EARTHLINK.NET on tue 8 aug 06
Hi Taylor... all...
You can just let the Water evaporate...till you
arrive at the consistancy you want...works
perfectly...
Best wishes...
Phil
las vegas
----- Original Message -----
From: "Taylor Hendrix"
> Bruce,
>
> As you well know, the industrial filter presses
like the one which
> dewaters David's beloved Black Jack are
monsterous devices and work on
> high pressure pushing the slip into the filter
bags.
>
> I have read about a much smaller, hand made
filter which uses low
> pressure to suck the slip through the filter
bags. I wish I knew
> where I read that, but I'm sure someone on the
list will chime in
> here. I do believe plans were included. Unlike
the cast iron models,
> this one was made partially of wood I think.
The low pressure
> approach made this possible. I have always
thought I would build one
> of those things, so someone remind me where I
read about it.
>
> No matter how one removes excess water from
blunged clay, it is still
> the best way to mix clay. But I've only mixed
clay two ways so far
> and my fingernails are really long these days...
>
> Taylor, in Rockport TX
Bruce Girrell on tue 8 aug 06
Dave Finkelnburg wrote and Ivor Lewis concurred:
>
> <<....When I want to mix clay, though, I need to go the slip
> route...which is, scientifically speaking, the BEST way to make
> and mix clay...>>
and I have no doubt that they are correct.
But a key element in this preparation method is the filter press. Where do
you come up with one of these babies? Not something that you see listed on
eBay every day.
My experience with allowing clay slop to stiffen in either a plaster or a
cloth container is that 1) it takes a very long time and 2) the clay
thickens very unevenly, requiring substantial work thereafter to homogenize
its consistency. So I don't consider allowing clay to thicken on its own to
be a practical method of processing anything but small quantities of
material and, hence, I would need a filter press.
How is a filter press built?
For X amount of clay, how much cloth do you need? What kind of cloth/canvas
will withstand the process? How much exposed area and how much pressure
plate area? How much pressure is applied? How do you know when to stop?
Anyone care to fill in a few blanks for me?
Bruce "squeeze me, baby" Girrell
Alan P on tue 8 aug 06
Hello Bruce,
With reference to your questions these links may be of interest:
Pictures of filterpresses big & small at:
www.lathaminternational.com/products.htm
More photos & detail of operation:
www.lathaminternational.com/Latham%20Brochure.pdf
www.lenntech.com/filter-press.htm
Filter press circa 1884:
www.sewerhistory.org/images/bm/bmp3/1884_bmp317.gif
Kind regards,
Alan
Dave Finkelnburg on tue 8 aug 06
Bruce,
I hate to tell you this, but in my experience, a
filter press does not yield a perfectly homogeneous
clay body. :-( Perhaps it was the design of the
filter presses I used, but they could produce fairly
dry and fairly wet spots in the cake. Operator skill
affected this, also. Bottom line is mixing and then
pugging or wedging were necessary to achieve a final,
uniform, plastic body for throwing or other forming.
Like you, I do like the idea of filter pressing,
but it really is a tool for a fairly large volume of
clay processing.
Good potting,
Dave Finkelnburg
--- Bruce Girrell wrote:
> My experience with allowing clay slop to stiffen in
> either a plaster or a
> cloth container is that 1) it takes a very long time
> and 2) the clay
> thickens very unevenly, requiring substantial work
> thereafter to homogenize
> its consistency. So I don't consider allowing clay
> to thicken on its own to
> be a practical method of processing anything but
> small quantities of
> material and, hence, I would need a filter press.
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Taylor Hendrix on tue 8 aug 06
Bruce,
As you well know, the industrial filter presses like the one which
dewaters David's beloved Black Jack are monsterous devices and work on
high pressure pushing the slip into the filter bags.
I have read about a much smaller, hand made filter which uses low
pressure to suck the slip through the filter bags. I wish I knew
where I read that, but I'm sure someone on the list will chime in
here. I do believe plans were included. Unlike the cast iron models,
this one was made partially of wood I think. The low pressure
approach made this possible. I have always thought I would build one
of those things, so someone remind me where I read about it.
No matter how one removes excess water from blunged clay, it is still
the best way to mix clay. But I've only mixed clay two ways so far
and my fingernails are really long these days...
Taylor, in Rockport TX
On 8/8/06, Bruce Girrell wrote:
...> But a key element in this preparation method is the filter press. Where do
> you come up with one of these babies? Not something that you see listed on
> eBay every day.
...
> How is a filter press built?
...
eelkema on wed 9 aug 06
Following is a link to 20 or 30 used filter presses available in Stockton
Ca. .42 cu feet up to 300 cubic www.pacceram.com/cat7d.htm
Lee Love on wed 9 aug 06
On 8/8/06, Bruce Girrell wrote:
> How is a filter press built?
This is what they use at the Mashiko clay cooperative. I have
photos up at one of my weblogs, but I am not sure which. Will take
some more when I got there again.
--
Lee in Mashiko, Japan
http://potters.blogspot.com/
"Let the beauty we love be what we do." - Rumi
Ivor and Olive Lewis on wed 9 aug 06
Dear Bruce Girrell,
As far as I know, a filterpress is a device for removing valuable =
fluids from worthless slurries. In other words it is a giant filter =
paper. Filter Presses are used in Breweries and distilleries to remove =
yeast from fermenting liquors. It is the liquid that is the important =
part.
Now I am not sure about their construction but I was getting a load of =
Stoneware from Bennett's Pottery in Adelaide some time ago when they =
were emptying their Filter press. Now it takes a fair amount of time to =
dewater clay slurry to a point at which it can become a reasonable =
plastic substance. One thing that I noticed was that when the sheets of =
clay were falling from between the Cells was that the paste was =
relatively firm on the outside but rather soft in the interior. So it =
does not produce a homogeneous product. to do that you have to leave the =
load under pressure for a long time, like several hours. Passage though =
the pug mill for packaging does little to change the clay into a =
uniform product. Though wedging may not be necessary to remove voids and =
trash, I believe Kneading is an essential stage that ensures uniformity =
of colour, texture, plasticity.
If you wish to try a filter press, Denim is the sort of cloth that is =
needed, fine weave that will hold back the clay. Take the legs from a =
pair of "Jeans". Sew up one end. Half fill with clay slurry fold over =
the end so that it can be trapped. Place it on a concrete flag and put a =
piece of 6 by 1 on it. Stand on the board ( or if you cannot keep your =
balance, load with bricks) until enough water to satisfy has seeped from =
the package.
Best regards,
Ivor
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