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Polyester felt filtering material in Aeropress
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Discussions > Coffee > Machines > Polyester felt...  
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rasqual
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rasqual
Joined: 29 Jun 2005
Posts: 1,064
Location: Chicago area
Expertise: I love coffee

Espresso: *$ Barista, non-pressurized
Grinder: SMP
Vac Pot: Yama, Aeropress
Drip: Porcelain Melitta 103, Hario
Roaster: "ring roaster", mod popper
Posted Thu May 18, 2006, 8:30am
Subject: Re: Polyester felt filtering material in Aeropress
 

Right. Yeah, I thought about trying, but now that you've chimed in I'll take that as a second and assume the body politic would vote unanimously for the attempt.  ;-)

Cut to the right diameter, this thing might work edge-to-edge in the FP, using the in-place screen as backing. Let the polyester follow the screen up the side of the FP a wee bit as well, perhaps. What makes me think that'll work is the way the felt "gives" a bit -- it's somewhat compressible.

Ok, that settles it. This will be fun.
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jrtATL
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jrtATL
Joined: 20 Feb 2004
Posts: 1,035
Location: Austin TX
Expertise: I love coffee

Espresso: Expobar Office Control
Grinder: Mazzer Jolly; Cunill...
Drip: Melitta Clarity
Roaster: Drum on a Weber grill; HG/DB
Posted Thu May 18, 2006, 9:28am
Subject: Re: Polyester felt filtering material in Aeropress
 

rasqual Said:

I knew from the previous batches that I'd have to start the brew in another container to avoid wash-through, but figures I'd skip that just to see what happened.

I put the coffee into the Aero, added the water, and stirred. I weighed the wash-through just before pressing; I had 3.6 oz. wash-through. I then pressed, and ended up with 7.4 oz total extraction (so a grind holds about twice its original weight in water?).

Posted May 16, 2006 link

Hi Scott,

Do you think you would have less wash-through if you put two layers of poly into the Aeropress?  Just curious.

Thanks,

Jeremy

 
"I've appeared before every court in the state.  Often as a lawyer." - Lionel Hutz, Esq.
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Yirga
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Joined: 3 Feb 2006
Posts: 659
Location: Big Bend
Expertise: Just starting

Posted Thu May 18, 2006, 1:43pm
Subject: Re: Aeropress and coffee oils
 

rasqual Said:

Someone take away that man's pharmaceuticals.   ;-)

Part 6376T31 is a 36" square sheet for $9. That comes in under a nickel per filter, and it should be good for many filtrations if carefully cleaned.

Posted May 17, 2006 link

I'll put my meds (zero) up against yours for low score wins but I'm really interested in your experiments since I solved the problem you're working on several months ago and enjoy your enjoyment of, The, Hunt For Red September, which already happened to me in March.  It's not about the Fox, but sipping Scotch whisky while hearing the hounds bay from smelling him while fast upon his trail!  O.K., so I sip some liquid medicine now and then!

Later on I'll post a thread with my solution to selective filtration and leave you to your folly for the time being.  Got whisky?
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rasqual
Senior Member
rasqual
Joined: 29 Jun 2005
Posts: 1,064
Location: Chicago area
Expertise: I love coffee

Espresso: *$ Barista, non-pressurized
Grinder: SMP
Vac Pot: Yama, Aeropress
Drip: Porcelain Melitta 103, Hario
Roaster: "ring roaster", mod popper
Posted Thu May 18, 2006, 7:26pm
Subject: Re: Aeropress and coffee oils
 

You post that thread soon and I'll pour some long-neglected Kahlua. No, wait! I have some Chechvar beer! Yes, that's the ticket!

OK, go! Post! Divulge!
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rasqual
Senior Member
rasqual
Joined: 29 Jun 2005
Posts: 1,064
Location: Chicago area
Expertise: I love coffee

Espresso: *$ Barista, non-pressurized
Grinder: SMP
Vac Pot: Yama, Aeropress
Drip: Porcelain Melitta 103, Hario
Roaster: "ring roaster", mod popper
Posted Thu May 18, 2006, 7:29pm
Subject: Re: Polyester felt filtering material in Aeropress
 

jrtATL Said:

Do you think you would have less wash-through if you put two layers of poly into the Aeropress?  Just curious.

Posted May 18, 2006 link

Possibly. But then I wouldn't get the oils.

I'm going to test an apparatus tonight to gage the effectiveness of inversion versus upright use of the thing. Will post results here.
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JohnF
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JohnF
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Posted Thu May 18, 2006, 7:41pm
Subject: Re: Polyester felt filtering material in Aeropress
 

Am I the only one grossed out by the material? Polyester makes me think of pressing the coffee through Venus Flytrap's vest or something.  :(

If 5 micron is the key then I'd like to see 5 micron paper filters to toss after each use.

But the results are interesting and props for being brave.

John F

 
"coffee is bag to me. It always follow me like bag. I do love coffee. Its taste & aroma make me sweet~ . I happy happy day with coffee"
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jrtATL
Senior Member
jrtATL
Joined: 20 Feb 2004
Posts: 1,035
Location: Austin TX
Expertise: I love coffee

Espresso: Expobar Office Control
Grinder: Mazzer Jolly; Cunill...
Drip: Melitta Clarity
Roaster: Drum on a Weber grill; HG/DB
Posted Thu May 18, 2006, 7:44pm
Subject: Re: Polyester felt filtering material in Aeropress
 

rasqual Said:

Possibly. But then I wouldn't get the oils.

I'm going to test an apparatus tonight to gage the effectiveness of inversion versus upright use of the thing. Will post results here.

Posted May 18, 2006 link

Do you see any way to get the oils withou inverting the unit?

 
"I've appeared before every court in the state.  Often as a lawyer." - Lionel Hutz, Esq.
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rasqual
Senior Member
rasqual
Joined: 29 Jun 2005
Posts: 1,064
Location: Chicago area
Expertise: I love coffee

Espresso: *$ Barista, non-pressurized
Grinder: SMP
Vac Pot: Yama, Aeropress
Drip: Porcelain Melitta 103, Hario
Roaster: "ring roaster", mod popper
Posted Thu May 18, 2006, 9:20pm
Subject: Re: Polyester felt filtering material in Aeropress
 

JohnF Said:

Am I the only one grossed out by the material?

Posted May 18, 2006 link

Oooh, no. The stuff has a purity to it that's unreal. It's inorganic, for one thing -- as opposed to the cellulose (read: wood) in filter papers.

Seriously, it's a gorgeousl material. That's probably because it's a felt -- a lot different than fabrics you'd find in clothing. Not woven, mind you. Felt. Like wool felt -- only not stretchy or as supple.

OK, I know I said I'd test an apparatus tonight. Alas, I couldn't find what I'd need to separate and measure the oils, and the lame second-rate solution I tried was . . . well . . . stoopid.

Combining lame methods with a sane attempt at using this stuff with an FP, though, was fun. The FP pressed too hard -- but fortunately I began pressing soon enough (with a finer grind than usual, BTW) that the coffee tasted fine by the time I got 2/3 done with the pressing and gave up.

No fines, plenty of oils in the cup. Tasty! But not practical for an FP.

The grind floating in the FP and impeding filtration (but also thereby enhancing extraction) reminds me of the inverted FP -- the floating bloom and grind in the Aero also impedes filtration quite a bit. Once you turn it over, it filters fine.

In all seriousness, anyone who wants to not waste coffee and still have a non-over-extracted cup from the Aero, stir until the moment you press it.

Say, this Yirg's pretty good . . .

rasqual: FP_POLY.jpg
(Click for larger image)
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darrylr
Senior Member


Joined: 3 Apr 2005
Posts: 253
Location: Washington
Expertise: I live coffee

Posted Fri May 19, 2006, 3:55am
Subject: Re: Polyester felt filtering material in Aeropress
 

rasqual Said:

Oooh, no. The stuff has a purity to it that's unreal. It's inorganic, for one thing -- as opposed to the cellulose (read: wood) in filter papers.

Posted May 18, 2006 link

Uhhh, no.  Polyester is an organic polymer.  So is cellulose for that matter.  Polyester is long chains of ester molecules (which are organic).  As for purity, that depends on whether there are traces still present of the chemicals used during manufacturing and processing.  Hopefully there are none, but unless there's a way to get that data you really want to be sure you wash the stuff real well.  It's not made for a food application so there's no telling what chemical traces may remain.

Darryl
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Yirga
Senior Member


Joined: 3 Feb 2006
Posts: 659
Location: Big Bend
Expertise: Just starting

Posted Fri May 19, 2006, 4:48am
Subject: Re: Aeropress and coffee oils
 

rasqual Said:

You post that thread soon and I'll pour some long-neglected Kahlua. No, wait! I have some Chechvar beer! Yes, that's the ticket!

OK, go! Post! Divulge!

Posted May 18, 2006 link

Not so fast my fiend, er, friend!  You were put here to do exactly what you're doing!  But don't ask me why?  And what would you do if I made your toil useless?

If you caught the fox the hunt would be over and no telling what you'd do?  Steady as she goes Captain!  Our DNA is somehow keeping up with global warming (yeah, deny your part in it).  Besides you just may come upon a cure for MRHS!
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