For anyone considering the poly felt route, over on Green Coffee Buying Club they are collaborating to produce some pre-cut, food grade polyfelt filters. I'm guessing more interest would be welcome, since the material comes in VERY large rolls. Someone already has the machine to cut them precisely. It sounds like it's just a matter of getting enough interest to justify the cost and effort.
For anyone considering the poly felt route, over on Green Coffee Buying Club they are collaborating to produce some pre-cut, food grade polyfelt filters. I'm guessing more interest would be welcome, since the material comes in VERY large rolls. Someone already has the machine to cut them precisely. It sounds like it's just a matter of getting enough interest to justify the cost and effort.
They also have 200 mesh, in 2 9/16 diameter circles. The Aeropress filters are 2.5 in diameter, but for some reason they don't have 2.5 in, just 2 9/16.
I believe 270 is the finest mesh available before the price takes a jump, but certainly one can go finer. The finest meshes are rather fragile, though.
Don't know the hole size of gold filters (which are built differently than the wire cloth that McMaster sells). Clovers, by way of comparison, use relatively coarse 70-100 mesh filters.
Mcmaster will quote special orders. You could call them and ask for a quote on 2.5" circles in whatever mesh size you desire. They will go back to the manufacturer and try and get it for you.
So I got my Swiss Gold knock off in the mail and I cut a filter out of one side. I've used it a few times and I like it but can't say it's better than the paper filter. The real test will be when my new Baratza grinder comes in on Monday and I can get a proper grind. I am surprised that I'm not getting much mud in the bottom of the cup with a whirly grind. I suspect it will be almost a no-mud cup with the new grinder.
I also have a few new coffees coming from Sweet Maria's so I'll be in super coffee nerd mode for the next couple of weeks.
There is a good reason why you don't get as much dust in the liquid (compared to French Press). A bed of coffee grounds collects at the bottom of the Areopress, and acts a little like a log jam, or beaver dam. Dust in the coffee has difficulty migrating through the bed, and mostly gets trapped on one side of the coffee bed. So the coffee becomes it's own filter.
In French Pressed coffee, the filter comes down from the top. Coffee grounds begin to sink earlier on in the steep time, gravity is pulling them down, and there is much less coffee blocking the passage of dust through the screen and into the liquid.
Most any non paper filter method does a better job of separation than the French Press (Vac/Siphon pot, gold cone, Areopress with metal screen, even a percolator).
Check out this macro for a good look at where the fines end up resting in the Areopress.
Wow, that's an amazing pic. No question where the fines go now :)
Although I haven't done back to back cupings, the gold filter in the Aeropress is almost like a cross between a paper filter Aeropress and a french press which is pretty much what I wanted. The couple of times I tried a french press it seemed a little to "dirty" of a cup. But, that was using coffee ground with a whirly so I should probably try again when I get my Baratza.
I believe 270 is the finest mesh available before the price takes a jump, but certainly one can go finer. The finest meshes are rather fragile, though.
Don't know the hole size of gold filters (which are built differently than the wire cloth that McMaster sells). Clovers, by way of comparison, use relatively coarse 70-100 mesh filters.
Mcmaster will quote special orders. You could call them and ask for a quote on 2.5" circles in whatever mesh size you desire. They will go back to the manufacturer and try and get it for you.
You could order any size filter paper or metal sieve that you like from a scientific supplier like Fisher, down to 20 microns (632 mesh). Specialized filters finer than this exist but I don't know of metal sieves that are finer. It would be interesting if someone ordered a bunch of different size sieves and did a detailed comparison. I assume this type of thing is done regularly inside big coffeemaker manufacturers.
I don't believe solder is anything you'd want in contact with higher temp liquids and/or food sources prior to entering your oral cavity. At least I wouldn't.
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