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Managing RoR flicks and crashes

This topic explains how to monitor and control sudden fluctuations in Rate of Rise (RoR) during roasting, ensuring a smooth, predictable roast curve.

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  • Coffee Basics Nerds
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Article 2 of 12 in Roast Profiling & Control/
Managing RoR flicks and crashes

Key Concepts

  • Understanding RoR Flicks:

  • A flick is a temporary spike or dip in the RoR caused by sudden changes in heat transfer or airflow.

  • Flicks often occur at turning point, when beans begin absorbing heat more efficiently.

  • RoR Crashes:

  • A crash is a sustained drop in RoR, usually from overloading the roaster, insufficient gas, or excessive moisture in beans.

  • Can lead to stalled Maillard reactions, uneven development, or extended roast times.

  • Causes:

  • Inconsistent drum speed or airflow.

  • Incorrect charge temperature for bean density.

  • Rapid addition of large bean batches.

  • Moisture content variance.

  • Management Strategies:

  • Pre-plan roast curve to anticipate energy needs.

  • Use gradual adjustments in gas, airflow, and drum speed.

  • Monitor RoR closely during critical phases (turning point, Maillard, first crack).

  • Segment beans by density and moisture when possible.

  • Practical Tools:

  • Software alerts for RoR deviations.

  • Manual interventions using gas or airflow to smooth spikes.

  • Post-roast analysis to refine future profiles.

Summary

Effectively managing RoR flicks and crashes ensures consistent bean development and reduces defects. By understanding the underlying causes and using real-time monitoring combined with controlled adjustments, roasters can maintain a predictable, stable roasting curve for optimal flavor extraction.

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Coffee Basics Nerds

Written by : Coffee Basics Nerds

Expert coffee historians and brewing enthusiasts dedicated to sharing the rich heritage and techniques behind your perfect cup of coffee.

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