Uneven color and heat application

Key Concepts

• Causes of Uneven Roasting:

• Inconsistent heat application within the roaster.

• Poor drum or airflow circulation.

• Variations in bean size, density, or moisture content.

• Incorrect charge temperature or batch loading.

• Visual Indicators:

• Patches of lighter and darker beans in the same batch.

• Some beans may show tipping or scorching while others remain underdeveloped.

• Solutions and Mitigation:

• Ensure even drum rotation and airflow throughout the roast.

• Sort beans by size and density prior to roasting.

• Adjust charge temperature and heat ramp for batch consistency.

• Use sample triers during roast to monitor color progression.

• Impact on Cup Quality:

• Uneven roasting leads to inconsistent flavor extraction.

• Can produce mixed notes: some burnt, some underdeveloped.

Summary

Uniform color and heat application are critical to cup consistency. Proper roaster management, pre-sorting, and monitoring help reduce uneven roasting defects.

• Tags:
• Key Concepts
• Cup Quality
• Moisture Content
• Charge Temperature
• Bean Size
• Inconsistent Flavor
• Uneven Roasting
• Size Density
• Concepts Causes
• Leads Inconsistent
• Impact Cup