Shea Nut Processing Silver B

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Shea Nut Processing Silver B

• Mock-Up Review
• October 18, 2007

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Customer Contract
Product Description A bicycle-powered shea nut
mill Customer Small-scale shea nut producing
villages in sub-Saharan Africa Market Fair-trade
agricultural products Cost Customer can afford
150 for a multiple-family unit
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Product Contract
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Risks and Issues

• What is the Best Way to Grind?
• What are the Power Requirements
• How Easy is it to Use?

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What is the Best Way to Grind?

• Press (compression only)
• Gravity-fed mill
• Press grind
• Auger-fed mill

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Press (compression only)

• Well, we got a little oil. -Gavin

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Gravity-Fed Mill

• I knew MIT kids could not have designed this to
  be the real thing. -Anonymous User

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Press Grind

• The nuts developed a smooth finish. -Brad

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Auger Fed Mill

• Hey, shea butter. -Karen

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Grinding Method Comparison

• Using our sketch model (the press) as a baseline

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How much Power is Required?

• Power Torque Angular Velocity

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Is it Easy to Use?
Bowl of Peanuts
Empty Bowl
Enticing Sign
Nut Grinder
Do not eat Sign
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Conclusions

• Best way to grind? Auger Mill plates
• Human Powerable? Yes
• Intuitive to use? Yes

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Initiation
Removing moisture for easier shelling
Harvest fallen nuts
Remove Fruit by Burial 12 days
Roast or Sun Dry 3-4 days
Parboil
Making paste for easier oil extraction
Shell Winnow
Roast
Pound w/ Mortar Pestle 30 min
Roast, Stir constantly with heavy stick 3-4 hours
Shelling more moisture removal
Ground to Paste (3-5 women w/ giant mortar
pestle, or several women with grinding stones)
Boil Fat Repeatedly
Remove Fat from Emulsion Using Large Spoon
Add Water and Knead by Hand 30-90 min
Wash Fat Repeatedly
Stir Cool Decanted Butter
Decant Repeatedly
Stir Constantly
Extracting the oil best non-chemical results by
hand
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