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

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Presentation transcript:

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

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

Product Contract  Ergonomic design  Made from locally available materials  Design easy to reproduce  Faster than mortar & pestle  Require low power input  Turn shelled shea nut into paste Product Attribute  Use 2 hours w/o pain or discomfort Comfortable to use  Steel fastened with welds  Reproducible by Ghanaian smiths Manufacturable & repairable locally  Output > 1.2kg/hr  Input Power < 60W Improvement on traditional methods  Grain size < 1mmHelps with shea butter production process Engineering Specification Customer Needs

Risks and Issues What is the Best Way to Grind? What are the Power Requirements How Easy is it to Use?

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

Press (compression only) “Well, we got a little oil.” -Gavin

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

Press & Grind “The nuts developed a smooth finish.” -Brad

Auger Fed Mill “Hey, shea butter.” -Karen

Grinding Method Comparison Using our sketch model (the press) as a baseline Press & Grind +00 Output Rate ++0 Constant Feed? +00 Paste Quality +00 Reliability Auger- Fed Gravity- Fed PressGrinding Mechanism

Power = Torque * Angular Velocity How much Power is Required?

Enticing SignNut Grinder Bowl of Peanuts “Do not eat…” Sign Empty Bowl Is it Easy to Use?

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

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