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Thread: Roasting times for small batches ?

  1. #1
    Senior Member redzone121's Avatar
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    Roasting times for small batches ?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi all

    I have not been able to get a definative answer from roasters over here (not that surprising) so can anyone tell me the difference in roasting times for small amounts 500gms to 1kg over say a 10kg batch. Is whats happening during the roast so different when a larger batch is being done?
    Yes, not being funny really would like to know :-/

    Thanks in advance.

    Chris

  2. #2
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    Re: Roasting times for small batches ?

    This roaster has realy got you confused.

    There is no real relationship between batch size and roast time. Roast times will vary due to roaster capabilities, results in the cup and the bean to be roasted.

    My experience:
    Coretto at home, 300g, around 16min
    5kg at work, around 15:30 min
    15kg at work, around 17min
    Sample roaster, around 8min - but these roasts are for a general "tasting" profile and to check for defaults before purhasing any coffee.
    Another local roaster, 20kg, around 14 min.

  3. #3
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    Re: Roasting times for small batches ?

    Ashleigh,

    Id be interested to know; if you roast a batch in your small sample roaster at work, then graduate to say the 5kg or the 15kg roaster, same beans, similar ramp to FC and final roast degree, then cup them blind, will they all taste very similar, or do some taste flatter, or have any undesirable characteristics?

    feel like running some experiments? I can supply the green if youd like.

    Chris,

    The other thing I suspect influences the taste in a corretto as compared with a probat sample roaster or any other commercial drum roaster is the airflow. On more than one occasion Ive cupped the same bean with similar roast profiles, the only differentiating factor being the airflow and I can tell you, that airflow has a big influence on the smoothness and finish.

    A corretto by its design maximises airflow, without any real way of changing that. A drum roaster gives you some control over this aspect.

  4. #4
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    Re: Roasting times for small batches ?

    Quote Originally Posted by 01030F0707090E13600 link=1256503383/2#2 date=1256509591
    Ashleigh,

    Id be interested to know; if you roast a batch in your small sample roaster at work, then graduate to say the 5kg or the 15kg roaster, same beans, similar ramp to FC and final roast degree, then cup them blind, will they all taste very similar, or do some taste flatter, or have any undesirable characteristics?

    feel like running some experiments? I can supply the green if youd like.

    Chris,

    The other thing I suspect influences the taste in a corretto as compared with a probat sample roaster or any other commercial drum roaster is the airflow. On more than one occasion Ive cupped the same bean with similar roast profiles, the only differentiating factor being the airflow and I can tell you, that airflow has a big influence on the smoothness and finish.

    A corretto by its design maximises airflow, without any real way of changing that. A drum roaster gives you some control over this aspect.
    I agree that airflow is probably the deciding factor in differences between batches. It may even explain your roasters thinking. All things being equal if you were to put a smaller batch of beans into the same drum roaster and give them the same profile the air flow around the smaller batch will be better then the airflow around the larger batch. As the beans will dry out faster with the smaller batch, this probably results in shorter profiles being needed/acceptable for the smaller roasts. If you take that one step further it can explain why people using poppers to roast get good results with only 6-8minute roasting times and I have heard of commercial fluid bed roasters doing batches as short as 2 minutes. Now obviously this is not ideal for us snobs as the perfect cup requires a balance of more factors then simply heat/airflow

    On the corretto and this applies also for t/o whilst the airflow above the bean mass is exellent its mixing motion simply circulates the beans around so everyone gets a go at the top. This contrasts a drum roaster where the beans are picked up and tossed around. The best way to find out definitively which roaster has better air flow would be to do a roast in each at the same profile and weigh them after to see which one lost more weight. Then do a cupping to see if the roasters need different profiles.

    There seems to be a consensus on this forum that corretto roasting gets good results with first crack in about 11-13 minutes where most professionals I talk to seem to think that first crack should be 8-11 minute territory. (Im sure there are pros who have different schools of thought on this.)

  5. #5
    Senior Member redzone121's Avatar
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    Re: Roasting times for small batches ?

    Behmor Coffee Roaster
    Thanks Ashleigh and Muppet, thats exactly what I was after.

    Chris



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