Coffee Roasting     suggestion for MCR-10

2024-01-07 04:08

suggestion for MCR-10

Greeting

I wonder why MCR-10 took a lot of time to roast 8 KG with full power 3 pa

It took yellowing more than 6 Min and the FC 12 Min

I'm not saying the coffee was bad it was one of the best Columbian coffees I have ever made even in my sample roaster which is Aillio R1 it took me 9 min from start to finish I know there is a huge difference between Gas and electricity but 30% delta it is huge.

when I tried the same setup for 10 KG it took me 16 Min and it was so bad I threw it away

any suggestions

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2024-01-08 04:48

Hi Khalid.

Bigger roasters roast longer. Green/yellow transition around 6 minutes isn't a big deal. 12 minute first crack is okay. Your graph shows only 45 seconds of post first crack development. That's a big problem.

Is that what happened here or do I misunderstand?

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2024-01-09 02:42

Hi Steve

why is 45 seconds a big problem?

I usually take between 45 Sec to 90 Sec for post-FC depending on the coffee seeds and it was a great batch sweet and balanced and my finish temp as I wanted 210 C

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2024-01-09 03:51

Hi Khalid.

Coffee flavor is a function of avoiding heat defect while heating the seed in a way that balances inner vs. outer seed color.

The short post first crack development time you describe usually results in a lighter inner seed color and more raw or undeveloped flavor notes.

You wrote "when I tried the same setup for 10 KG it took me 16 Min and it was so bad I threw it away."

Why exactly did you throw it away?

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2024-01-10 01:48

Hi Steve

I threw it because the taste was burnt I suspected that maybe because it was the first batch after seasoning the drum but I tried another batch same result so I reduced the batch to 8 KG and it was as I expected in terms of flavor and time.

to be honest I cleaned the drum with a dry towel before the 8 KG batch and I never tried the 10 KG due to having a limited supply of coffee seeds for testing.

for your point regarding the 45 Sec post-FC I didn't face any of your concerns, the notes were balanced, sweet, and fruity

however, I know there is much potential that I didn't unlock from this coffee but it is a lifelong journey I will figure it out eventually.

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2024-01-10 03:33

Have you completed the set up and seasoning roast calls with Aziz?

We should verify your installation before we try to troubleshoot roast issues.

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2024-01-11 02:45

Hi Steve

yes, we completed that and the setup was great, I learned a few tricks from Aziz and he noticed that my gas regulator should be 35 mbar which is not available in Kuwait we used 30 mbar for domestic use I had to order the regulator from Spain it will be delivered next week.

there is no issue with my roaster just it took a long time to roast and you mentioned that because it is a big roaster it takes time.

thank you for the follow up I appreciate your effort.

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