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COFFEE ROASTING SAMPLE PROCEDURES & EQUIPMENT · COFFEE ROASTING SAMPLE PROCEDURES & EQUIPMENT By...
Transcript of COFFEE ROASTING SAMPLE PROCEDURES & EQUIPMENT · COFFEE ROASTING SAMPLE PROCEDURES & EQUIPMENT By...
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GOLDEN BEAN 2012
CALOUNDRA
COFFEE ROASTING
SAMPLE
PROCEDURES &
EQUIPMENT
By Mark Beattie
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AGENDA
Coffee Roasting Lab Process Flow 1. Green Bean Evaluation
• Moisture Analysis • Density Analysis • Grading • Sample Roasting
2. Brown Bean Evaluation • Moisture Analysis/ Weight Loss • Colour Analysis • Particle Size Analysis • TDS Analysis
3. Cupping
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ROASTING PROCESS FLOW
Green Bean Evaluation
Sample Roasting
Brown Bean Evaluation
Cupping Scoring
Bean Selection
SELECTING AND EVALUATING ORIGINS
Green Bean
Size
Moisture
Defects Smell
Processing Method
Brown Bean
Evenness
Weight Moisture
Loss
Colour Smell
Shape
Cupping
Aroma Wet/Dry
Acidiy
Flavour Body
Balance
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1. Green Bean Evaluation
Green Bean
Size
Moisture & Density
Defects Smell
Processing Method
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Moisture Analysis
Moisture & Density
- Expressed as a % of water to total
“To attain true repeatability all variables need to be eliminated”
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Moisture Analysis
Moisture & Density
- Impacts storage conditions
- Check for value of purchases and shrinkage
- Ideal 9-12% for roasting (9-13% grading)
- Importance for consistent roasting results
- Helps determine pre blend options
“To attain true repeatability all variables need to be eliminated”
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Density Analysis
Moisture & Density
- Expressed as weight per volumetric measure
- Measure g/cm3
“To attain true repeatability all variables need to be eliminated”
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Density Analysis
Moisture & Density
- Bean density impacts roasting conditions
- Denser beans have tighter cell structures
- High Density: good conductor
- Low Density: poor conductor
- Higher altitude generally more dense
- Slower growing
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Grading
2 main methods 1. SCAA (takes into account cup character) 2. Brazil/New York Exchange
*Note: Each Origin usually also has their own grading method
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Grading
- Typically done using screens (10-20)
- Higher number larger size
- SCAA: 300g at 5% above or below tolerance
Size
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Grading
- Defects affect cup quality
- Count and record (Primary vs Secondary)
- SCAA also takes into account Quakers
Defects
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Processing Method
- The processing method used on a coffee is usually the single largest contributor to the flavour profile of a coffee.
Processing Method
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WET PROCESS
Cleaner
Brighter
Fruitier
Better acidity
DRY PROCESS
Heavy body
Sweet
Smooth
Complex
Pulped Natural
Brazil
Low humidity
Honey Processed
Re-Passed
Experimental
Floaters
Understand Coffee Processing
Processing Method
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Sample Roasting
- 2 x 100g samples - Lighter (Agtron 60) easier to
detect origin character and defects
- Darker more caramalised notes, also important for Australian market
- Consistency is important
- 8+ mins
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Source: http://www.coffeeanalysts.com
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Source: http://www.coffeeanalysts.com
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2. Brown Bean Evaluation
Brown Bean
Evenness
Weight/ Moisture
Loss
Colour Smell
Shape
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Weight Loss
Weight/ Moisture
Loss
- Weight loss can help measure consistency of profiles and potential cup character
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Moisture Loss
Weight/ Moisture
Loss
- Comprehensive units like SINAR can measure moisture in roasted coffee
- Too much moisture can lead to shorter shelf life
- Quenching and humidity adds moisture - Measure of consistency
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Colour Analysis
Colour
“Two identical green coffee bean samples can be roasted to the same colour, but have dramatically different physical characteristics, most notably in bean size, pore size and pore volume, by simply changing the temperature and time parameters.”
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Colour Analysis
Colour
- Primarily used to determine when to drop coffee
- Monitor consistency of roast profiles - Tolerance level for roasters for QA - Colour tiles cheapest option but limited for
analysis and prone to human error - Ground vs whole bean
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Colour Analysis
Colour
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Particle Size Analysis
- Even size distribution ensures consistent extraction rate
- Provides information on grinder setting and grinder maintenance (café & cupping)
- Consistency important
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TDS Analysis
- Stands for Total Dissolved Solids (PPM)
- Used more for brewed/filter coffee
- Consistency of extraction Proper grind
calibration
- Strength of coffee & optimal extraction
(SCAA Brewing Control Chart)
Brewed 1.0-1.5% vs Espresso 15-25%
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SCAA
BREW
CHART
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3. Cupping
Cupping
Aroma Wet/Dry
Acidity
Flavour Body
Balance
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Cupping Equipment
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Develop and rank a score sheet
RANK TRAIT 1 2 3 4 5
1 FLAVOUR
4 BALANCE
3 ACIDITY
2 AROMA
5 BODY
6 CREMA
Consider espresso vs milk based etc
Add cupping notes
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COMMON SAMPLE CUP SCORING METHOD
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FLAVOUR
WHEEL
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