HomeRoast Digest


Topic: ZipLoc Vacuum bags (9 msgs / 196 lines)
1) From: Steven Van Dyke
The thread on Thanksgiving coffee reminded me - the new ZipLoc vacuum 
bags are a good choice for travel / gifting coffee.
They're just a nice, heavy bag with a one-way valve up near the 
corner.  The ZipLock pump is a simple hand-powered affair that should 
last forever (and if it doesn't it's only about $3 for a new one).
For our trip I'm taking the RIP.  Roasted it yesterday afternoon and 
vacuumed it down tight.  Bag is softening but not swelling yet.
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2) From: R Nepsund
I remember reading here that one should expose the roasted coffee to the air
for a few hours otherwise the flavors can be muted.
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3) From: Seth Grandeau
I think most people leave their coffee open to the air for the first few
hours, up to a day, to let it out-gas.  Then seal it in something airtight,
so it doesn't go stale.
I use the Ziploc bags and have been happy with them, but after a few uses,
the seal is no longer airtight.  I'm guessing there are little bits of
coffee or more likely chaff that prevent an airtight seal.  I'll get a tight
vacuum, but a few hours later, will be loose.
On 11/24/08, R Nepsund  wrote:
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4) From: Brian Kamnetz
I seem to recall someone (Ed?) saying that he has run some taste
tests, and as long as you use your coffee in 10 days or a couple
weeks, you can leave it in an open bowl (out of the sun, etc., of
course) with no ill effects.
Brian
On Mon, Nov 24, 2008 at 1:02 PM, Seth Grandeau  wrote:
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5) From: an iconoclast
On Mon, Nov 24, 2008 at 3:39 AM, Steven Van Dyke wrote:
<Snip>
Wow, last night I was vac packing raisins, thinking....I wish there were
ziplock vac bags. And there are!
Thanks for sharing,
Ann
<Snip>
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6) From: Steven Van Dyke
Normally I just pour the beans into mason jars and put the lids on 
slightly loose so they can vent but for travel...
At 12:06 PM 11/24/2008, you wrote:
<Snip>
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7) From: sci
I have and use ZipLoc reusable vacuum bags, the Reynolds version, and
Vacu-Seal. All are zip seals and reusable. By far, the Vacu-Seal is the
best, but hardest to find.
As for whether it makes a difference in storing coffee, try it yourself. Its
pretty inexpensive and you can use them for all kinds of foods.
IMHO, it makes a noticeable difference. Oxidation of volatile organic
compounds in foods happens very rapidly. Peel a banana or cut an apple and
wait one mere hour: the oxidation makes them almost unpalatable. THat's why
my beans go straight from the roaster into a vacuum sealed bag. They still
degas. A vacuum will not thwart degassing.
"Coffee Animal"
++++++++++++++++++++++++++++++++
Date: Mon, 24 Nov 2008 13:06:31 -0500
From: "Brian Kamnetz" 
Subject: Re: [Homeroast] ZipLoc Vacuum bags
To: homeroast
Message-ID:
       <33aa9a30811241006o56e1bc95ue31e4c60f95072d6>
Content-Type: text/plain; charsetF-8
I seem to recall someone (Ed?) saying that he has run some taste
tests, and as long as you use your coffee in 10 days or a couple
weeks, you can leave it in an open bowl (out of the sun, etc., of
course) with no ill effects.
Brian
On Mon, Nov 24, 2008 at 1:02 PM, Seth Grandeau  wrote:
<Snip>
airtight,
<Snip>
tight
<Snip>
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8) From: raymanowen
As the contents of a vacuum generate free CO2 gas molecules, the vacuum
leaks out just like the dark leaks out if you leave the darkroom door ajar.
(I never had a light-safe revolving door- just a B/W darkroom)
If you have a VWR lab or a refrigeration vacuum pump, you will be able to
remove 99+% of the free gas molecules from within the coffee structure.
(Refrigeration techs have long used the vacuum to Dry Out the refrigeration
circuit. ANY moisture in the lines or refrigerant would freeze at the
expansion valve and stop the whole cycle. Evacuation removes H2O and other
gas molecules equally well.)
Every time you open the evacuated and sealed closure (ZipLoc), fresh O2
molecules force their way back into the coffee structure. The CO2 evolved
from within would normally force the O2 molecules out. If it tastes good
after several pressure cycles, consider that you may be fond of mildly stale
coffee.
Cheers, Mabuhay and Magandang Umaga -RayO, aka Opa!
On Fri, Nov 28, 2008 at 7:25 PM, sci  wrote:
<Snip>
-- 
"When the theme hits the bass, I dance the Jig!" - -Virgil Fox at the Mighty
Wichita (ex- NYC Paramount) WurliTzer- 1976
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9) From: raymanowen
"*What is the purpose of "evacuating" a refrigeration system?*
Evacuating a refrigeration system serves two primary objectives:
*1.* It removes noncondensables.
*2.* It dehydrates (removes water vapor).
"If noncondensables such as air are not removed, the system will operate at
higher than condensing pressures. This happens because the air is trapped at
the top of the condenser, effectively reducing the condenser capacity.
Increasing the condensing pressure results in higher compression ratios and
higher discharge temperatures, both of which decrease system efficiency and
can lead to decreased reliability.
"*Water vapor* must be removed from refrigeration systems for several
reasons. The water vapor can cause a "freeze-up" at the expansion device
(TXV or capillary tube), causing a complete loss of refrigeration effect.
Moisture, refrigerant, and heat can also combine to form acids. These acids
mix with oil and metal wear particles resulting in the formation of sludge.
This sludge tends to collect at the hottest areas, usually the discharge
valve plate, and if allowed to build up can prevent the discharge valves
from properly sealing.
*"Does evacuation actually pull liquid water out of the system?*
No, evacuation will not pull liquid water out of the system. When you
evacuate a system you are actually dropping the pressure sufficiently to
allow water to "boil" at room temperature. As the water boils, it of course
changes to the vapor state, and this vapor is drawn out by the vacuum pump."
                            *QED *-ro
On Sat, Nov 29, 2008 at 12:08 AM,  wrote:
<Snip>
-- 
"When the theme hits the bass, I dance the Jig!" - -Virgil Fox at the Mighty
Wichita (ex- NYC Paramount) WurliTzer- 1976
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