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KKTO insulation
Gullygossner
Top  #1 Print Post
Posted on 01/07/2020 11:45 AM
Just wondering what others running the kkto setup are using for insulating the exterior of the roaster? I believe fire blankets are common but I find the fiberglass material a little tricky to work with (messy to cut, stiff).
 
renatoa
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Posted on 01/07/2020 12:34 PM
You can use plain wool cloth, pure wool is the filling inside most kitchen gloves that aren't silicone based.
The temperature must reach 570?600?C before wool will ignite, this temperature will never happen at exterior of a TO based oven.
 
Gullygossner
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Posted on 01/07/2020 2:51 PM
Good call! I?ll see if I have anything wool laying around that i could repurpose. Silicone sheets are another consideration I?ve had.
 
Koffee Kosmo
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Posted on 01/07/2020 4:08 PM
I simply use an old cotton bath towel
Just wrap it from over the lower silicone tube and around the pots - then clip it securely with a clothes peg

When finished you can then cover the entire setup with the same towel to keep it dust free

KK
I home roast and I like it. Designer of the KKTO
Roaster Build information
https://homeroast...ad_id=1142

https://docs.goog...lide=id.i0
Blog - http://koffeekosm...gspot.com/

Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex,
(KKTO) Turbo Oven Home Roaster.
 
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Gullygossner
Top  #5 Print Post
Posted on 01/07/2020 8:33 PM

Quote

Koffee Kosmo wrote:

I simply use an old cotton bath towel
Just wrap it from over the lower silicone tube and around the pots - then clip it securely with a clothes peg

When finished you can then cover the entire setup with the same towel to keep it dust free

KK


That?s great to hear! I was hoping someone had experimented with a cotton towel as it is something i have kicking around the house and it?s easy enough to work with.
 
renatoa
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Posted on 01/08/2020 2:14 AM
Cotton can ignite and burn around 215 C, when pure, which is a temperature too close to minimum 230 C that is inside oven at final of roast, so beware...
Even worse, when oily, self-ignition temperature decrease, and can happen even in the range where beans are just drying, not even browning, i.e. 120-150 C.
Guess how could become cotton oily... Grin
 
Koffee Kosmo
Top  #7 Print Post
Posted on 01/08/2020 5:45 AM

Quote

renatoa wrote:

Cotton can ignite and burn around 215 C, when pure, which is a temperature too close to minimum 230 C that is inside oven at final of roast, so beware...
Even worse, when oily, self-ignition temperature decrease, and can happen even in the range where beans are just drying, not even browning, i.e. 120-150 C.
Guess how could become cotton oily... Grin


In over 10 years of using a cotton towel
Ignition has never happened at all

But if the OP wants more surety - then something in pure wool will be just as good

KK
I home roast and I like it. Designer of the KKTO
Roaster Build information
https://homeroast...ad_id=1142

https://docs.goog...lide=id.i0
Blog - http://koffeekosm...gspot.com/

Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex,
(KKTO) Turbo Oven Home Roaster.
 
Web
renatoa
Top  #8 Print Post
Posted on 01/08/2020 9:26 AM
There are some reports about cotton clothes self igniting in hot air / tumble dryer machines / laundromats, is where I found this warn when doing my initial research, when I want to use cotton on mine for insulation.
 
Gullygossner
Top  #9 Print Post
Posted on 01/08/2020 2:58 PM
My initial reservation to cotton was based on the ignition temperature but one side is room temperature and the hot side would be in a scenario where there probably wouldn?t be enough oxygen for ignition.

I was looking for other members who had potentially used a towel and i feel confident to at least do a handful of roasts until I source some felt.
 
renatoa
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Posted on 01/09/2020 3:10 AM
Holy war reason: ask your wife about that pure wool scarf she loves so much... Grin
 
mkane
Top  #11 Print Post
Posted on 02/27/2020 7:17 PM
2" wide exhaust header wrap?
Always learning
 
Koffee Kosmo
Top  #12 Print Post
Posted on 02/27/2020 9:19 PM

Quote

mkane wrote:

2" wide exhaust header wrap?


I?m pretty sure this is a similar auto exhaust product

i.postimg.cc/rdXGt3TZ/592E1E56-514B-45AD-9EC9-3B610E8E6E23.jpg
I home roast and I like it. Designer of the KKTO
Roaster Build information
https://homeroast...ad_id=1142

https://docs.goog...lide=id.i0
Blog - http://koffeekosm...gspot.com/

Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex,
(KKTO) Turbo Oven Home Roaster.
 
Web
Alaroast
Top  #13 Print Post
Posted on 02/28/2020 7:13 AM
I like the clean look of using the exhaust header wrap as opposed to the bulkiness of a cotton towel. I did use a towel on mine for my first roast and other dry runs to check running temperatures. If you have a good TO to pot seal such as the silicone tubing that others have used, the towel does provide a great insulating wrap that should be relatively safe as long as its not left unattended although slightly bulky. I started researching either fiberglass of lava rock based wraps. The instructions for the lava rock based wraps indicate a burn in time where the material will smoke (and I guess slightly char). But I'm guessing that will not be the case if used on the outside of our roasters since they do not see the same extremes as engine exhaust manifolds.

Anybody that has used the exhaust wraps on your roaster, what has been your experience with smoking or smell on your roaster if any?
Edited by Alaroast on 02/28/2020 7:35 AM
Fiorenzato Bricoletta Espresso Machine, Obel EB Grinder, USRC 3kg roaster
 
renatoa
Top  #14 Print Post
Posted on 02/28/2020 8:21 AM
Catalytic converters require a temperature of 800 degrees Fahrenheit (426 ?C) to efficiently convert harmful exhaust gases... so I guess this is the exhaust temperature, or close.
The 270 C MET of coffee roasting looks like barely warmish compared to an exhaust pipe. Grin
 
Alaroast
Top  #15 Print Post
Posted on 02/28/2020 4:48 PM
So I can call this my satellite roaster for now. I used some surplus MLI ( multi layer insulation) from a cryogenic tank for a satellite. Intended to work in the vacuum of space but heated roaster up to 500F and it was just warm to the touch. Not too bulky and definitely one of a kind.
Alaroast attached the following image:
roaster_insulation_2.jpg
Edited by Alaroast on 02/28/2020 4:54 PM
Fiorenzato Bricoletta Espresso Machine, Obel EB Grinder, USRC 3kg roaster
 
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