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Thread: Roasts dont seem to be degassing?

  1. #1
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    Roasts dont seem to be degassing?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hey
    Just started roasting... I roasted, cooled and the put in one way valved bags. I roasted Tuesday, Wednesday and yesterday, bagged each batch separately, but Im not seeing the bag blow up.
    Im using used bags which I have washed out, and then sealed. Maybe not 100% air tight, but you have to squeeze them pretty hard to get air out.
    Is there any reason they wouldnt be letting off gas?
    Could the green beans be stale? Eg more than 3 months old?

  2. #2
    Life-long Learner DesigningByCoffee's Avatar
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    Re: Roasts dont seem to be degassing?

    Hi JB
    Depends on how packed your bag is. I roast 350g and jam into a 250g bag (like a brick really ;D) - so I dont really see any movement at all until Ive emptied out the first 100g or so. Once there is some room in the bag, it puffs up pretty quickly. But Ive also found it speeds up after a few days - sometimes 4-5?
    But I also wonder if there is little or no degassing after this time - could be under-roasted? Some of my earlier attempts didnt degas much - but also were quite flavourless and sour - which I now realise meant they werent roasted right through. This could certainly reduce the amount of gas being given off if they are still greenish.
    So maybe taste and see :)

    Matt

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    Re: Roasts dont seem to be degassing?

    Thanks DBC,
    On my first 2 roasts on tuesday with my new popper, i confused rolling first crack with second crack and pulled the beans out at about 3:30 during rolling first crack - noob.
    My last few roasts have gone longer, managed to get the popper to 2nd crack at between 9 and 12 mins (depending on technique) and pulled out during rolling 2nd crack. These are the bags below:
    Red bag: Roasted about 18 hours ago, 160g of beans in a 200g bag.
    Black bag: Roasted 50 hours ago, 120g of beans in a 350g bag.
    Beans are Colombian.
    Any thoughts?



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    Life-long Learner DesigningByCoffee's Avatar
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    Re: Roasts dont seem to be degassing?

    Hi JB
    I dont know if Id stress to much - 120g probably reduces to about 100g once roasted - that leaves 250ml of space for gas in those bags - and that amount of beans certainly wont produce that much. If youre now getting to second crack in those sorts of times youre looking good - so wait a few days (Im finding my beans peak at about 7 days on) then give it a try! The main thing is removing the oxygen… which youve done pretty well by the look of the black bag :o
    Let us know how it tastes!
    Matt

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    Senior Member trentski's Avatar
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    Re: Roasts dont seem to be degassing?

    Try packing more into those bags and you should see a difference, you get a fair bit of gas from 500grams of beans but not that much from 200grams (less than half as much in fact ;D)

    Im not surprised you dont see much but it will be there

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    Senior Member shapeshifter's Avatar
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    Re: Roasts dont seem to be degassing?

    I dont know that degassing matters for small quantities, I store mine in Falcon tubes, no one way valves there :D My coffee also tends to last longer stored in these than in bags, maybe I shouldnt say lasts longer but the changes happen slower.

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    Re: Roasts dont seem to be degassing?

    Thanks guys for all your help!
    The 200g bag is closer to full, so Im assuming Ill see some gas from there soon.
    Ive only got a popper, so cant roast much more than the small batches at a time.
    Ill let you know in a couple of days how it all goes.

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    Re: Roasts dont seem to be degassing?

    Hey jb,

    I had the same query as you when I first started roasting...I used to get bags of brown from beanbay and they would always be bursting - was so much fun pushing on them and smelling the freshly roasted beans.

    When I started roasting and storing in new, valved bags, I never got the same amount of gas that I saw from the beanbay bags. I recently started heat sealing them (just with an iron) and now they are bursting until I cut them open so I can only assume that the zips arent THAT airtight even though they seem to be.

    Dont stress too much though, if youre like me most of it will be drunk within a week or two and even though I heat seal them, Im normally cutting them open in less than 36hrs!!

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    Super Moderator Javaphile's Avatar
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    Re: Roasts dont seem to be degassing?

    Behmor Coffee Roaster
    Quote Originally Posted by 16232C252D420 link=1317937920/7#7 date=1319782145
    I can only assume that the zips arent THAT airtight even though they seem to be
    Correct. The zips make a good seal, but not a perfect one like a heat sealer will.


    Java "Seal em up tight!" phile



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