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chigen5
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Joined: 6 May 2012
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Location: Virginia
Expertise: Just starting

Posted Sun May 6, 2012, 9:03am
Subject: Gasket sealed container or one-way valve pouch for storing coffee?
 

New to coffeegeek forums. I was recently given an opaque airtight gasket sealed coffee jar. Up till now I have just been keeping my WHOLE beans in the original pouch with the one way seal valve and making sure I squeeze the air out of it as much as possible everyday I open it.

My questions is this: Although the pouch may not be airtight I am able to squeeze all the air out, at least for that day. With the jar, however, it may be airtight, but what about all that air that stays trapped in the container in the empty space between the level of the beans and the lid? Also is it better to store beans in containers with the one-way valve.

Thanks
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VernS
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Posted Mon May 7, 2012, 7:23am
Subject: Re: Gasket sealed container or one-way valve pouch for storing coffee?
 

One-way valves are used by many roasters to permit packaging freshly roasted beans and not having to wait a couple days for the out gassing to subside. The gases given off during this initial stage of the stalling of the beans would burst sealed packaging if it were not for the valve.
There is another possible use for the valve once you have the beans at home and past this stage, but I need to know if your original pouch has a resealable opening such as the Ziploc zipper style.
Once I have that information I can give you a better answer.
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chigen5
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Location: Virginia
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Posted Mon May 7, 2012, 5:07pm
Subject: Re: Gasket sealed container or one-way valve pouch for storing coffee?
 

no it is just a typical coffee pouch with the bendable wire to keep the opening closed. But what do you think about that layer of air that would be trapped between the level of coffee beans and the lid of the airtight cannisters?
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wsikes
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wsikes
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Posted Mon May 7, 2012, 5:25pm
Subject: Re: Gasket sealed container or one-way valve pouch for storing coffee?
 

chigen5 Said:

My questions is this: Although the pouch may not be airtight I am able to squeeze all the air out, at least for that day. With the jar, however, it may be airtight, but what about all that air that stays trapped in the container in the empty space between the level of the beans and the lid? Also is it better to store beans in containers with the one-way valve.

Posted May 6, 2012 link

When you first place fresh-roasted beans in a mason jar, there will be some airspace that does include some oxygen in it.  However, as the beans de-gas they will force the oxygen to the top of the jar since CO2 is much heavier than O2.  When the de-gassing beans cause a pressure build-up inside the jar, you will "burp" the jar and release most of the O2.  This is true as long as you are holding the jar in an upright position during the "burp" and not  moving the jar around a lot (which would cause the CO2 and the O2 to become mixed temporarily).  A good analogy is a jar of muddy water that has sat long enough for the sediment to settle to the bottom of the jar. If you are not careful in handling the jar you will "muddy the water" so to speak.
With careful handling, burping the jar is an effective way of ridding the jar of most of the O2.
One more thing... the seal on the ziplock bag with the one-way valve is a pretty good seal, but it is nowhere as good a seal as the one the mason jar provides.  The difference in the life of the roasted bean may not differ very much from one of these methods to the other, but for home storage I prefer the jars and for shipping beans I prefer the bags.
Hope this helps a little... remember, YMMV (that's called CYA... lol)

EDIT: Oops... you said you are using the bags with the wire seal.  Mason jars are far superior to this kind of bag... IMHO...

 
Bill
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VernS
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Espresso: (strength) AeroPress
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Posted Mon May 7, 2012, 6:21pm
Subject: Re: Gasket sealed container or one-way valve pouch for storing coffee?
 

[no it is just a typical coffee pouch with the bendable wire to keep the opening closed. But what do you think about that layer of air that would be trapped between the level of coffee beans and the lid of the airtight cannisters?[x]

Since I'm assuming you do no roast your own beans and it is at least a few days since they were roasted, I think you are right to be concerned about the layer of air above the beans in the canister. Some people buy multiple sizes of cannisters so they can use the smallest size possible, as they use the beans, and keep the air to a minimum. I use an airtight cannister with vacuum pump built into the lid. If I'll be opening it within a couple days, I depress the large button about 10 times. You have not mentioned a pump so I'll assume your cannister does not have one.
If you can improve the seal on your pouch I would continue with your method of evacuating as much air as possible from the bag. To improve the seal I would try a large plastic bag clamp of the type that hinge at one end and latch at the other. One that I have has KLIPPO printed on it and the Ikea ones are called BEVARA, but they may be to small. If your beans are very fresh, then I expect that some of the members with their own roasters and much more experience than me, will have better advice.
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TheBigDripper
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TheBigDripper
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Posted Tue Jun 5, 2012, 4:40pm
Subject: Re: Gasket sealed container or one-way valve pouch for storing coffee?
 

Which is why I buy only one week's worth of beans at a time.
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
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Location: Riverside, Ca, U.S.A.
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Roaster: gave it a try, decided no
Posted Fri Jun 8, 2012, 5:39am
Subject: Re: Gasket sealed container or one-way valve pouch for storing coffee?
 

Then the issue isn't really all that big. Beans give off gas strongly in the first several days (the need for the valve) but this goes down and stops after about a week give or take a little, keep your beans cool, in the dark and sealed from new air and all will be OK. At a week old, I really doubt that there will be much if any issue with air space in the container. Less is better for sure but you are well in the freshness window at a week.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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