introduction - nri · 2018-01-05 · there was an average peeling efficiency of 63.22% and an...

1

• Mechaniza)onof cassavaprocessingopera)onswillplaya pivotal role in removing the nega)ve a7ributes of thetradi)onalprocessingtechniquesandpromote)melylargescaleprocessingofthetubersinhygienicenvironment.

• It has beenwell documented that cassava peeling is themajorchallengeofcassavaprocessing inNigeria(Nwokedi1983; Olukunle et al., 2006; Olajide and Jekayinfa, 2007;Egbeochaetal.,2016).

• Several a7empts have been made at solving theseproblems which resulted in the development of varioustypes of cassava peeling machines (Olukunle andAdemosun,2006;Akintundeetal.,2005)

INTRODUCTION

2

The aim of this study was to design and construct aninnova)ve cassava peeling machine using locally sourcedengineeringmaterials.To evaluate the performance efficiency of an innova)vecassava peeling machine using two improved cassavacul)varsnamely:(i)TMS30572(ii)TME419

AIM OF THE STUDY

3

Componentsofthemachineare:

• TheHopper• ThePeelingUnit• TheOutletUnit• TheDieselEngine• ThePeelerSeat• PowerTransmissionsystem

• Thefruitwatertank• Thedrivinganddrivenpulley• TheSha\

MATERIALS AND METHODS

4

Thematerialsneededinfabrica)ngthecassavapeelerare:

• MildSteelPlate

• StainlessSha\

• AngleIron

• BoltsandNuts

• IronRodandWeldingElectrodes

• StainlessSteelPlate

MATERIALS OF CONSTRUCTION The

DESIGN CALCULATIONS

5

Thefollowingparameterswerecalculatedusingstandardformulae:

•  PowerRequirementDesign•  BeltAnalysisDesign•  Analysisofdrivenpulleyanddrivingpulley•  Determina)onofwrapangles•  Determina)onofBeltTensions•  Sha\Design•  Determina)onoftwis)ngmoment(𝛕)•  Determina)onofPolarmomentofiner)aofthesha\about

theaxisofrota)on(𝑱)•  Determina)onofsha\torqueandpermissibleangleoftwist(KhurmiandGupta,2005).

6

3D DESIGN OF THE MACHINE

7

RESULTS

Table 1: Result of peeling by the Cassava Peeler

8

VarietySpeed(rev/

min)Dura4onofPeeling(min)

WeightofTuber(kg)

WeightofPeeledTuber(kg)

WeightofPeels(kg)

%WeightofPeels

MeanPeelingEfficiency(%)

TME419 1600.00 4.56 30.00 24.00 5.50 18.3 75.5

TME419 1600.00 6.01 50.00 42.50 7.50 15.00 84.0

TME419 2600.00 3.81 30.00 21.20 8.80 29.30 61.5

TME419 2600.00 5.19 50.00 40.30 9.70 19.40 71.5

TMS30572 1600.00 4.52 30.00 24.18 5.82 19.40 71.5

TMS30572 1600.00 6.04 50.00 42.61 7.39 14.78 85.75

TMS30572 2600.00 3.92 30.00 20.91 9.09 30.30 58.6

TMS30572 2600.00 5.17 50.00 41.10 8.90 17.80 61.2

9

RESULTS

10

•  The fabricated cassava peelingmachine at the speed of1600 revolu4on per minute had an average peelingefficiency of 79.18% and an average flesh loss of 5.09%forthe2varie4es.

•  However, when the speed was raised to 2600 rev/min

therewasanaveragepeelingefficiencyof63.22%andanaveragefleshlossof5.95percentforthe2varie4es.

•  Hence, lowspeedofrota4onofthepeelingmachinewill

increase the peeling efficiency and decrease percentagefleshlossandthepeelingprocessiseasiertocontrol..

DISCUSSION

11

•  The configura4on resulted into careful removal of thetuber peels achieving > 90% flesh recovery at averagerota4onalspeedof1600rpm<Nt<2600rpm.

•  The average peeling efficiency of the machine was58.6-85.75% depending on the maturity (age) andvariety.

•  Thecostofasingleunitwases4matedat$1,230.

CONCLUSION

12

Garro[e,R.L.,Coutaz,V.R.,Luna,J.A.,Silva,E.R.,andBertone,R.A.(1993). Op4mizing Processing condi4ons for Chemical peeling ofpotatoes using Response Surface methodology. Journal of FoodScience58(4):821-826Khurmi,R.JandGupta,J.K.(2005).Atextbookofmachinedesign,NewDelhi–110055,EurasiaPublishingHouse.KolawoleO.P. andAgbetoyeL.A.S.(2007).EngineeringResearchto

ImproveCassavaProcessingTechnology,Interna4onalJournalofFoodEngineering:6:6–9Nwokedi,P.M.(1983).Performanceofacassavapeelingmachine.InTropical Root Crops. Terry. E. R., Doku, E.V., Arene, O. B. andMahungu,N.M.(eds).ProceedingsofthesecondtriennialsymposiumoftheInterna4onalSocietyofTropicalRootCrops-AfricaBranchheldinDoula,Cameroon,14-19August,1983.

SELECTED REFERENCES

13