木薯淀粉介紹

Major：Chemicaltechnology

Cassavastarchandit’sapplication1.Cassava,isalsocalledmaniocoryucca.Theplantgrowsinabushyform,upto2.4m(8ft)tall,withgreenish-yellowflowers.Therootsareupto8cm(3in)thickand91cm(36in)long.Therootscontainfrom20to32%ofstarchatmaturity.Earlymaturingcultivarsarereadyforharvestafter8-12month.Aboutcassava2.

Twovarietiesofthecassavaareofeconomicvalue:thebitter,orpoisonous;andthesweet,ornon-poisonous.Thetoxinincassavaiscalled"linamarin".ItischemicallysimilartosugarbutwithaCNionattached.Justafewpiecesofcassavarootscontainafataldoseofpoison.3.DryingSettlingordewateringCassava

starchPeelingFiltering/screeingWashingCassavarootMixingwithwater

Starchwashing

SettingGrating/raspingMillingSimpleprocessforcassavastarchproduction

4.

Starchisoneofthemostabundantsubstancesinnature,arenewableandalmostunlimitedresource.

Cassavastarchisanimportantsourceofenergyforhumansandanimalsasfood,andhasmanyremarkablecharacteristics,includinghighpasteviscosity,highpasteclarity,andhighfreeze-thawstability,whichareadvantageoustomanyindustriesasarawmaterial,suchaspaper,textiles,adhesives,confectionery,pharmaceuticals,andbuildingmaterials.Application5.Therootinpowderformisusedtopreparefarinha,amealusedtomakethincakessometimescalledcassavabread.ThestarchofcassavayieldsaproductcalledBrazilianarrowroot.Asfood1

6.Paperindustry

Inthepaperandboardindustries,starchisusedinlargequantitiesatthreepointsduringthemanufacturingprocess:

Ⅰ.attheendofthewettreatment,whenthebasiccellulosefiberisbeatentothedesiredpulptoincreasethestrengthofthefinishedpaperandtoimpartbodyandresistancetoscuffingandfolding;

Ⅱ.atthesizepress,whenthepapersheethasbeenformedandpartiallydried,starchisusuallyaddedtooneorbothsidesofthepapersheettoimprovethefinish,appearance,strength,andprintingproperties;

Ⅲ.inthecoatingoperation,whenapigmentcoatingisrequiredforpaper,starchactsasacoatingagentandasanadhesive.2

7.TextileindustryInthetextileindustry,starchisusedinthreemainareas:sizing,finishingandprinting.

Andapproximately80%ofthestarchusedintextilesisusedinsizing.

3

8.Adhesivesindustry4

Cassavastarchadhesivesaremoreviscousandsmootherworking.Theyareflu