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Thread: De-gassing beans

  1. #1
    Senior Member Lovey's Avatar
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    De-gassing beans

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Ive seen a few threads asking for suggestions for beans that are fast de-gassers so they could be used sooner after roasting, mainly for espresso use.
    Ive also seen threads talking about the vacuum sealing containers, the vacuvin brand springs to mind. The general consensus seems to be that theyre not so good for storing roasted (rested) beans as they stale the beans quicker, due to drawing the CO2 out of the roasted bean.

    I had a little thought about these two elements. What if you put the freshly roasted (still degassing) beans into the vacuum sealing container?

    1- Would this serve to speed up the de-gassing process, rendering the beans more usable for espresso quicker?

    2- Or, would the amount of CO2 coming out of the beans overwhelm the vacuum in the container?

    If 2, could this be overcome by more pumps of the vacuum pump, or am I just reaching?
    Any ideas, theories?

  2. #2
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    Re: De-gassing beans

    Lovey,

    During the De-gassing phase excess carbon dioxide is given off..... until the beans more or less stabilise.

    Sure reduced pressure (applying a vacuum) will cause this gas to be given off faster.... but a very important element (which gives espresso the taste and aroma) are the volatile oils in the beans...... and these evaporate slowly even at room temperature and atmospheric pressure. Reduce the pressure and these will boil off a lot faster.... and leave the coffee flat tasting.

    De-gassing is a natural process..... and just like many other natural processes..... is best left to occur at its own rate. Speeding it up is not a good idea (why is it we want everything to happen "yesterday"!!!)...... just roast a little earlier and let nature take its course would be my advice.

  3. #3
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    Re: De-gassing beans

    I think ages ago, I put some just roasted beans in a VacuVin and pumped it. I looked at it a day or so later and the top was loose and I guessed it was from the degassing of the beans filling the vacuum. I havent used it for coffee for ages as I like my coffee with natural aroma and flavour. The VV sucked that out.

  4. #4
    Senior Member redzone121's Avatar
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    Re: De-gassing beans

    I used Thermos vacumn containers for a while (until they all faulted), and have recently been trialing the one way valve tins from Sweet Marias. I have been resting in de gassing bags for 2-3 days and then filling tin to the top and using from there. What I have noticed is the Thermos pump tins certainly sped things up and the beans actually got oily in the tin and the aroma of the beans wasnt that pleasant. The one way valve tins seem to let things happen at a more natural speed (as JavaB mentioned) and when you take the lid off the aroma is devine and no oiling can be seen.

    Anyway thats my experience so far. Enjoy !

    Chris

  5. #5
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    Re: De-gassing beans

    Gday All,
    I was going to look for an old post for this question so thanks Lovey for asking it again.

    Chris what tins do you use that have a one way valve?
    There has been a lot of negativity towards Illy coffee here but his "Bean" tins have a wonderful one way valve on the bottom which helps with the de-gassing, and they dont look too bad on the shelf.
    I was just wondering if you can buy a can like this without the Illy beans. At $16.00 per tin its an expensive way of getting good bean storage. I found the valve manufacturers web site but I havent contacted hem about it and I havent found a retailer yet.

    Thomas

  6. #6
    Sleep is overrated Thundergod's Avatar
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    Re: De-gassing beans

    A valved bag lined with a freezer bag costs a lot less than $16.

  7. #7
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    Re: De-gassing beans

    About 6 months ago I started using empty red wine bottles to store my fresh roasted coffee. I use the vacuum stopper you can get for evacuating the air in an opened bottle, but i dont use the plunger to evacuate the gas, they are just an excellent one way valve. Most bottle shops have these stoppers @ 3 for about $6, and they last for ages. Not sure about you guys, but there is at least one empty red bottle a week at my place and its a great use for something that would otherwise go in the bin.

  8. #8
    b
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    Re: De-gassing beans

    Is it possible to buy compressed nitrogen for home use to flush a sealed container with? That would keep the temp and pressure up without the oxidation.

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    Re: De-gassing beans

    That wine bottle idea is a corker! Now....time to get my roasting set-up going.....

  10. #10
    Mal Dimal's Avatar
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    Re: De-gassing beans

    Quote Originally Posted by [ch945
    [ch8467][ch273][ch915][ch1209][ch1179] link=1219624675/0#7 date=1221176777]Is it possible to buy compressed nitrogen for home use to flush a sealed container with? That would keep the temp and pressure up without the oxidation.
    Yep, you sure can baldy...

    If you go to your nearest BOC Gas Centre, they will have pretty well everything youll likely need to do this. Wont be cheap though.... ;)

    Mal.

  11. #11
    Senior Member speleomike's Avatar
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    Re: De-gassing beans


    Ask for a laboratory demonstation cylinder.
    It will be just 30 cm long and about 8 cm dia.

    I really dont think its worth it.

  12. #12
    Mal Dimal's Avatar
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    Re: De-gassing beans

    Quote Originally Posted by speleomike link=1219624675/0#10 date=1221223293
    I really dont think its worth it.
    I dont either Mike but the man asked the question after all.....

    Mal.



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