Shea Nut Processing Silver B - PowerPoint PPT Presentation

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Shea Nut Processing Silver B

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Title: Shea Nut Processing in Rural Ghana Author: Michael Stern Last modified by: Philip Garcia Document presentation format: On-screen Show Other titles – PowerPoint PPT presentation

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Title: Shea Nut Processing Silver B


1
Shea Nut Processing Silver B
  • Mock-Up Review
  • October 18, 2007

2
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
3
Product Contract
4
Risks and Issues
  • What is the Best Way to Grind?
  • What are the Power Requirements
  • How Easy is it to Use?

5
What is the Best Way to Grind?
  • Press (compression only)
  • Gravity-fed mill
  • Press grind
  • Auger-fed mill

6
Press (compression only)
  • Well, we got a little oil. -Gavin

7
Gravity-Fed Mill
  • I knew MIT kids could not have designed this to
    be the real thing. -Anonymous User

8
Press Grind
  • The nuts developed a smooth finish. -Brad

9
Auger Fed Mill
  • Hey, shea butter. -Karen

10
Grinding Method Comparison
  • Using our sketch model (the press) as a baseline

11
How much Power is Required?
  • Power Torque Angular Velocity

12
Is it Easy to Use?
Bowl of Peanuts
Empty Bowl
Enticing Sign
Nut Grinder
Do not eat Sign
13
Conclusions
  • Best way to grind? Auger Mill plates
  • Human Powerable? Yes
  • Intuitive to use? Yes

14
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15
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16
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
17
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