Results 1 to 28 of 28

Thread: Shocked at Loss of Bean Mass when roasting!

  1. #1
    Senior Member
    Join Date
    Mar 2006
    Location
    Brisbane
    Posts
    756

    Shocked at Loss of Bean Mass when roasting!

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    I did a 400 gram roast today in the BM. My own Costalumbian I pre blend.

    All went well, although under trying circumstances.

    At the end of the day I decided to weigh the lovely coffee beans after taking in their delectable aroma and proudly staring at them for a while, as one does. Well a CS anyway 8-)

    Shock horror! [smiley=evil.gif]

    They now weighed only 336 grams!! [smiley=huh.gif] which equals a 16% loss to chaff/smoke/steam? etc

    Now in all the roasts I have done previously I knew they lost weight, but never thought to weigh them post roast. And I thought Id been going through great quantities of beans in the last few weeks. Apparently not quite so much. :o

    So there ya go ...........

    Belinda

  2. #2
    Senior Member
    Join Date
    Jul 2006
    Posts
    3,498

    Re: Shocked at Loss of Bean Mass when roasting!

    Hi Belinda...

    The last roast I did (Brazilian) started at 300gm and finished with a roasted weight of 248 grams....

    About 18% weight loss....

    I think both your figure and the above are in the "normal" range.

  3. #3
    Senior Member
    Join Date
    Aug 2006
    Posts
    160

    Re: Shocked at Loss of Bean Mass when roasting!

    I did a roast of PNG A grade (last of my starter pack) on the weekend, and started with 260gm and ended up with 210gm.

    About 19% weight loss!

    Wow!

  4. #4
    TC
    TC is offline
    .
    Join Date
    Oct 2004
    Location
    Melbourne
    Posts
    14,665

    Re: Shocked at Loss of Bean Mass when roasting!

    Quote Originally Posted by Myrtle link=1160534386/0#2 date=1160535545
    I did a roast of PNG A grade (last of my starter pack) on the weekend, and started with 260gm and ended up with 210gm.

    About 19% weight loss!

    Wow!
    Yeppers....20% is by no means atypical ;)

  5. #5
    Senior Member
    Join Date
    Mar 2006
    Location
    Brisbane
    Posts
    756

    Re: Shocked at Loss of Bean Mass when roasting!

    Yeah, I thought 16% probably wouldnt be a too dramatic loss in the big scheme of things.

    But after never having weighed post roast before it was still a bit of a shock though :-)

    I always imagined if I roasted 150 grams thats how much Id have to drink at the end of the day.

    But not so apparently :-/

    Just something to think about !!


    Belinda

  6. #6
    Super Moderator Javaphile's Avatar
    Join Date
    Dec 2004
    Location
    Earth!
    Posts
    15,762

    Re: Shocked at Loss of Bean Mass when roasting!

    Those are all in the normal range. Ive seen some beans/roasts as low as 15% and others as high as a 20% weight loss with most running around 17%.


    Java "All in a days roasting" phile

  7. #7
    Senior Member
    Join Date
    Apr 2006
    Posts
    1,564

    Re: Shocked at Loss of Bean Mass when roasting!

    Yeh, I roasted 320gs last night and ended up with 265g of roasted beans,,,,

  8. #8
    Senior Member
    Join Date
    Dec 2005
    Posts
    164

    Re: Shocked at Loss of Bean Mass when roasting!

    i normally just go with 15% standard loss, thats typically what i get when i bother to weigh post roast.

  9. #9
    lsd
    lsd is offline
    Member
    Join Date
    Dec 2005
    Posts
    40

    Re: Shocked at Loss of Bean Mass when roasting!

    With the number of beans I invariably tip over the side while tossing them around to cool them Ive had losses up to about 25% :) Im getting better with that now though, with a 400g roast of the PNG peaberry from the last poll coming out around 330g.

  10. #10
    Senior Member
    Join Date
    Aug 2006
    Posts
    1,588

    Re: Shocked at Loss of Bean Mass when roasting!

    Ive always understood it to be around a 20% mass change - I factored that into my early considerations of cost of beans (before I found coffee snobs that is!)

  11. #11
    Senior Member
    Join Date
    Mar 2006
    Location
    Brisbane
    Posts
    756

    Re: Shocked at Loss of Bean Mass when roasting!

    Well, maybe I shouldve named the topic, "Shocked I never weighed the Post Roast before, When Everyone Else was Doing It" :-)

    Seems Im the only one who didnt :o

    So do certain beans lose more mass than others??


    Belinda

  12. #12
    Senior Member
    Join Date
    Jul 2006
    Posts
    3,498

    Re: Shocked at Loss of Bean Mass when roasting!

    Quote Originally Posted by Corretto link=1160534386/0#10 date=1160546737
    So do certain beans lose more mass than others??
    Belinda
    Belinda

    It depends to a large extent on the initial water contect of the grean beans.... So yes, some do lose more that others...

    I think (others with more knowledge and experience can shed more light on this) that it depends on the variety (region), how it was cleaned and washed, how it was stored etc.....

    So a bean with a high water content will lose a lot more weight, and darker roasting will lose more compared to a light roast (but not sure how much extra you lose.... however if you go as far as charcoal there is no water left ::))!!!

    EDIT: commercial bean moisture content (quality beans ;)) ranges from 9-13% of total weight - then there is the weight of the chaff etc Some lesser quality beans can have > 13% water content (but will mold easily)..... roasting time/temperature needs to be adjusted to compensate for water content (so the experts say :D)

    Expected total weight loss during roasting is 14 - 23% depending on bean variety and handling prior to roasting.

  13. #13
    Senior Member
    Join Date
    Aug 2005
    Posts
    1,530

    Re: Shocked at Loss of Bean Mass when roasting!

    I always account for 25% loss, regardless of bean. That way, if Im divying it out to friends and family, when I weigh it up, Ill often have 10-15g per batch in reserve. This means I dont have to roast too many extra batches for myself.

  14. #14
    CoffeeSnobs Owner Andy's Avatar
    Join Date
    Mar 2004
    Location
    Internet
    Posts
    16,943
    Blog Entries
    1

    Re: Shocked at Loss of Bean Mass when roasting!

    While we are all throwing numbers around...

    13%-17% is what I would have called typical (depending on roast depth mostly)

    14% +/- 2% is a fairly typical water content for green beans from the suppliers so you guys further north in the more humid climates might start with a higher water content before roasting depending on how exposed your beans were and for how long they have been absorbing airborne wet stuff.

    My 2.second crack worth.

  15. #15
    Senior Member
    Join Date
    Jun 2004
    Posts
    283

    Re: Shocked at Loss of Bean Mass when roasting!

    my simple brain likes, well, simplicity, so I just use 20%. 600gm green goes to 500gm roasted. 300->200, and thats about the extent of my calculations. Any more than that I open Excel :)

    Perhaps I throw out more under- or over-roasted ones too, so i spill more of them around the place...

  16. #16
    Senior Member
    Join Date
    Apr 2005
    Posts
    1,176

    Re: Shocked at Loss of Bean Mass when roasting!

    Quote Originally Posted by Andy Freeman link=1160534386/0#13 date=1160578673

    so you guys further north in the more humid climates might start with a higher water content *before roasting depending on how exposed your beans were and for how long they have been absorbing airborne wet stuff.
    Wow, thats like value adding. My 2.5 kg of beans may end up as 2.6 kg in a month or two and than I can sell of the extra 100 gm and still have my 2.5 kg.... wait another month and sell off another 100 gm and so it goes.

    I wonder why no one has thought of this before? * ;)

  17. #17
    Super Moderator Javaphile's Avatar
    Join Date
    Dec 2004
    Location
    Earth!
    Posts
    15,762

    Re: Shocked at Loss of Bean Mass when roasting!

    Quote Originally Posted by Sparky link=1160534386/15#15 date=1160713710
    I wonder why no one has thought of this before? ;)
    They have! Havent you ever heard the tale of Jack and the Magical Beans? ;D ;D ;D


    Java "Counts his beans by the light of the full moon" phile

  18. #18
    HD
    HD is offline
    Junior Member
    Join Date
    Mar 2004
    Posts
    28

    Re: Shocked at Loss of Bean Mass when roasting!

    Yes, there is weight loss and there is a range. But now that youve all gone bean-hopping mad with the RS232s, and that roast profiles can be plotted and some control can be exercised over how the beans develop, weight loss information can:
    - be one of the variables to track consistency in roast profiles (eg. if that Costa roasted the same way as the last registers similar weight loss +-0.2% means youve nailed this roast)
    - if you dont have a moisture meter, weight loss of one lot of beans can be compared to weight loss of another lot of the same origin
    - give an indication of changes to the beans if youre experimenting with roast profiles (eg. I roasted the Costa to the same colour and to the same endpoint but one batch I extended a certain part of the roast for a minute longer while the second batch is pretty much straightforward. By sight, the same. By weight and by cup, quite different.

    Weight loss can be a good thing...for me anyway ;)

    HD

  19. #19
    Member
    Join Date
    Aug 2004
    Posts
    42

    Re: Shocked at Loss of Bean Mass when roasting!

    Over my past 65 roasts (total for this year), the average decrease in mass is 15.83%.

  20. #20
    Senior Member
    Join Date
    Mar 2006
    Posts
    397

    Re: Shocked at Loss of Bean Mass when roasting!

    I was a bit slow to pick up this thread, busy weekend, etc, but am glad it was raised because I have been wanting to compare. (I am also looking forward to comparing results from the datalogging set once we are all up and running.)

    My roasts average 17.89%, with a low of 14% Brazil Cerrado Bold (Sun Dried) and a high of 21% Costa Rica Santa Elena.

    Will be interesting to see what impact the warmer weather has with less moisture etc.

    The good thing about my heeding the advice to keep a database when I started roasting is that I will soon have annual comparisons, how good is that!

  21. #21
    Super Moderator Javaphile's Avatar
    Join Date
    Dec 2004
    Location
    Earth!
    Posts
    15,762

    Re: Shocked at Loss of Bean Mass when roasting!

    I roasted up 2.8kg of beans the other night and weighed them up tonight before grinding them up for CP and I ended up with 2.73kg. A weight loss of 15.4%.

    The blend is 7 parts Nicaraguan Angelina Estate, 4 parts PNG Kimel X, and 3 parts Peruvian (I forget which estate). The beans were roasted as SOs in 200g batches with a couple batches of the Nicaraguan being taken just into the roll with everything else being pulled between the first snaps of 2nd crack and just prior to the roll.

    It smelled really nice being ground up and I cant want to taste it tomorrow! :) :)


    Java "Sniffin da Bean" phile

  22. #22
    Senior Member
    Join Date
    Mar 2006
    Location
    Brisbane
    Posts
    756

    Re: Shocked at Loss of Bean Mass when roasting!

    Quote Originally Posted by Javaphile link=1160534386/15#20 date=1161765674
    I roasted up 2.8kg of beans the other night and weighed them up tonight before grinding them up for CP and I ended up with 2.73kg. A weight loss of 15.4%
    Sounds very nice. Love the Nicaraguan beans.

    But are you sure you ended up with 2.73KG from 2.8? that works out to a 2.5% loss. :-/


    Belinda

  23. #23
    Senior Member
    Join Date
    Jul 2006
    Posts
    3,498

    Re: Shocked at Loss of Bean Mass when roasting!

    Quote Originally Posted by Corretto link=1160534386/15#21 date=1161766156

    But are you sure you ended up with 2.73KG from 2.8? that works out to a 2.5% loss. :-/


    Belinda
    I think he meant to type 2.37KG.....

    Ahhhh Java - Too much coffee makes you dyslexic! :D ;D

  24. #24
    Super Moderator Javaphile's Avatar
    Join Date
    Dec 2004
    Location
    Earth!
    Posts
    15,762

    Re: Shocked at Loss of Bean Mass when roasting!

    Quote Originally Posted by Corretto link=1160534386/15#21 date=1161766156
    Sounds very nice. Love the Nicaraguan beans.
    Yeah theyre a great bean! I really like them! A strong rich flavor thats not over-bearing with a nice touch of spiciness. Uuuummm.....Yummy!

    But are you sure you ended up with 2.73KG from 2.8? that works out to a 2.5% loss. :-/
    Arg! I had a laugh Sorry, I transposed the digits. I ended up with 2.37kg of beans. :-[ ::) :D


    Java "One of these days Ill learn to type what Im thinking!" phile

  25. #25
    Senior Member
    Join Date
    Mar 2006
    Location
    Brisbane
    Posts
    756

    Re: Shocked at Loss of Bean Mass when roasting!


    Thought it must have been a typo :-)

    I found since recording the loss Im averaging 18% over the last 5 roasts.

    Wonder if the relative humidity at the time has anything to do with it (which was around 50 to 65% for each roast) ..........



    Belinda




  26. #26
    Senior Member
    Join Date
    Feb 2006
    Posts
    2,334

    Re: Shocked at Loss of Bean Mass when roasting!

    expect anything from 11% to 25% loss in weight depending on beans and roast profile.

  27. #27
    Senior Member robusto's Avatar
    Join Date
    Feb 2005
    Posts
    2,785

    Re: Shocked at Loss of Bean Mass when roasting!

    Quote Originally Posted by Corretto link=1160534386/15#24 date=1161767245
    Thought it must have been a typo :-)

    I found since recording the loss Im averaging 18% over the last 5 roasts.

    Wonder if the relative humidity at the time has anything to do with it (which was around 50 to 65% for each roast) ..........

    Belinda

    Belinda, that figure is pretty much what Im experiencing (17 per cent) :(

    220 grams goes in....183 or so comes out.

    Part of that is our backyard contribution to global warming. Soon, Andy will have to add a carbon trading tax to every shipment. ;D

    -Robusto

  28. #28
    Senior Member
    Join Date
    Aug 2005
    Posts
    1,530

    Re: Shocked at Loss of Bean Mass when roasting!

    Behmor Coffee Roaster
    I always account for 25% regardless. If I have a little left over, so be it.



Similar Threads

  1. shocked by my own snobbery.
    By kotaro in forum General Coffee Related...
    Replies: 9
    Last Post: 22nd August 2010, 12:43 PM
  2. Hottop bean mass temperature probe
    By gregpullman in forum Roasters
    Replies: 19
    Last Post: 11th March 2009, 03:44 PM
  3. Mass Production
    By cuppacoffee in forum General Coffee Related...
    Replies: 27
    Last Post: 6th March 2009, 10:41 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •