机械设计类英文文献及翻译Word格式.docx
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机械设计类英文文献及翻译Word格式.docx
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Andtoeitherlocateahome—scaleoilseedpressordeviseone.Nomeantask.OurresearchestookusfromNorthDakota——hubofcommercialsunfloweractivityinthenation——toasearchofthefilesintheU.S.PatentOffice,withstopsinbetween。
Weturnedupalotofbigmachinery,discoveredhowdifficultitistobuyreallypure,unrefinedvegetableoils,butfoundnosmall—scaleequipmenttodehullsunflowersorpressouttheiroil。
Thekeytosuccess,however,wasonourdeskthewholetime。
Inspring1977,AugustKormierhadsubmittedafree—lancearticledescribinghowheusedaCoronagrainmilltodehullhissunflowerseeds,andhisvacuumcleanerexhausthosetoblowthehullsoffthekernels.Asecondseparationfloatedofftheremaininghulls,leavingacleanproduct。
We’dtriedit,butbecausesomekernelswerecrackedandtheprocessinvolveddrying,wehadn'
tbeensatisfied.NowwefeltthebestapproachwastobeginagainwithwhatwelearnedfromMr。
Kormierandrefineit.StaffEditorDianaBranchandHomeWorkplaceEditorJimEldonworkedwithanumberofhand—andelectric—poweredgrainmills。
WhiletheCoronadidapassablejob,theygotthebestresultswiththeC。
S。
Bell#60handmillandtheMarathonUniMill,whichismotor—driven.”Icouldn’tbelievemyeyesthefirsttimeItriedtheMarathon,"
Dianasays。
”Iopenedthestonesto1/8thinch,andoutcameabinfullofwholekernelsandhullssplitrightattheseams.Whatathrillthatwas!
”Shefoundthatbystartingatthewidestsetting,andgraduallynarrowingtheopening,almosteveryseedwasdehulled。
Thestonescrackthehullsopen,thenrubthemtoencouragetheseedawayfromthefibrouslining。
TheBellhandmillworkedalmostaswell.”Aslongasthestonesopenatleastaswideasthewidestunhulledseed,anymillwillwork,”shesays.Becausetheseedslipsthroughthemillonitsflatside,gradingisanimportantsteptotakebeforedehulling。
Wemadethreesizingboxes。
Thefirstis1/4—inchhardwarecloth[wirescreen]。
Thesecondistwolayersof1/4-inchcloth,movedslightlyaparttonarrowtheopeninginonedirection,andthethirdistwolayersofscreenadjustedtomakeastill-smalleropening.Sincethesmallestunhulledseedsareaboutthesizeofthelargesthulledkernels,thegradingsteppreventstheseundersizedseedsfrompassingthroughunhulled.Processedtogetherataclosersetting,thesmallestseedshulledout。
JimEldon'
sworkshopislitteredwithstrange-lookingpiecesofapparatus。
Theyrepresentinitialattemptstobuildaworkablewinnowingbox,usingKormier'
svacuumexhaustideaforasourceofair.Jim,FredMatlackandDianafinallymadeaboxwithaPlexiglasfront,throughwhichtheycouldobservewhatwashappening.Theycutaholeinthebackoftheboxwithaslidingcovertoregulatetheairpressure,andfiddledwithvariousarrangementsofbaffles。
Theresultwasastreamofhullsexitingthroughoneholewhilethekernelsfelltothebottomofthebox。
Nowtheywerereadytotryafive-poundsampleofunhulledsunflowerseedstoseehowmuchtheycouldrecover.Thefivepoundsweregradedanddehulled,thenwinnowed。
Wegotaboutonehullforeverytenkernelsinthefinal,winnowedproduct.Theseareeasilypickedout。
Theyusuallycontainkernelsstillheldbehindthefibrousstringsofthehull.Theirweightpreventsthemfromblowingoutwiththeemptyhulls。
Wefoundthatbug—eatenseedsdoblowawaywiththechaff,whichwasabonusforcleanlinessofthefinalproduct.Tossthehullstothebirds,whowillfindbrokenseedsamongthem.Startingwith80ouncesofunhulledseed,weendedupwith41-1/4ouncesofediblewholeseeds,1.8ouncesofdamagedseedssuitableforanimalfeed,and36.6ouncesofhulls。
Ittookusaboutanhour.Notbad。
Sunflowerseedsstoreperfectlyinthehulls,buttheydeterioratemorerapidlywhenshelledout。
Thegrainmilldehullerandwinnowingboxgivethegardenerawaytohavethefreshestpossibleseedsforeatingatalltimesoftheyear.Withtheconstructionofonemorepieceofequipment-—theoilpress-—hecanhaveabsolutelyfresh,unrefined,polyunsaturatedsunfloweroilforsalads,mayonnaiseandcooking.
Mostlight,refinedvegetableoilshavebeenextractedusinghexane,aformofnaphtha.Theoilisthenheatedtoboiloffthehexane。
Lyeisdumpedintoit.It’swashedwithsteam,thenheatedtoremoveodorsandtastebeforebeinglacedwithpreservativesandstabilizers.Itmayfeeloilyinthemouth,butyoumightaswelltasteair.Nosowithfresh-madesunfloweroil-—it'
sdeliciouslyyetsubtlynuttyinflavor,addingunsurpassedflavortosalads.There'
sgoodreasontobelievethatsunfloweroilmaybecomethe#1vegetableoilintheU。
S.inafewyears。
It'
salready#1inhealth-consciousEurope。
Cornoilhasalreadycaughtonhereforhealthreasons,andsunfloweroilissomuchbetter。
Sunfloweroil'
s70percentpolyunsaturateisjustundersafflower,withcornoilbringinguptherearwith55percent。
Andsunflowersyield40percentoil,soybeansonly20percent。
Ouroilpressisrelativelysimple,butitmustbeweldedtogether。
Checktheconstructiondirectionsfordetails.Thepressconsistsofaweldedtubularframewhichacceptsathree—tonhydraulicjack.Youmayalreadyhaveone.Ifnot,itcanbepurchasedatmostautoandhardwarestoresforabout$16.Ametalcanisterwithholesdrilledinitssidesandoneendweldedshutholdsthemashedsunflowerseeds.Apistonisinsertedinthecanisterandtheninvertedandslippedoverapedestalontheframe.Thejackissetinplace,andthepressuregraduallyincreasedoverhalfanhour.Theoildripsfromthesidesofthecanisterintoatray——thebottomofaplasticjugslippedoverthepedestalworksfine--whichemptiestheoilintoacup。
Youcanfiltertheoilwithacoffeefiltertoremovepiecesofseedandotherfineparticlesthatwouldburniftheoilwereusedforcooking。
Ifit'
sforsaladsormayonnaise,there’snoneedtofilterit。
Wefirsttriedusing"
confectionary”sunflowerseedsforoil.Thesearetheregulareatingkernelswe’reusedtoseeing.Theygivelessthanhalfasmuchoilastheoilseedtypesofsunflower.AlthoughyoucanuseconfectionarytypessuchasMAMMOTHRUS—SIANforoil,don’texpecttogetmorethananounceandahalffromapoundofseed。
Oilseedproducesthreeormoreouncesofoilfromapoundofseedandiswellworthplantingalongwithconfectionary—typeseeds.Oilseedhasanotherbigadvantage——toprepareit,youcanputthewhole,unhulledseedintoablenderandwhizituntilitformsafinemeal,whileconfectionaryseedsmustbedehulledfirst.Theentiresequenceofgrading,dehullingandwinnowingisavoidedwithoilseed.Oiltypesproduceaboutatenthofapoundofseedperheadincommercialproduction.Gardeners,withtheirbettersoilandcare,invariablydobetterthanthat。
Ourconservativeestimateisthat1,280plantswillbeenoughforthreegallonsofoil.Spacedonefootapartinrowstwofeetapart,1,280oilseedplantswilltakeaspace40—by—56feet,or80-by-28ifyouwantamorerectangularpatchtofacesouth。
Weworkedinpoundbatches,sincethecanisterjustholdsonepoundofmash.Afterblending,weheateditto170degreesF。
(77degC)byplacingitina300-degreeF.(149degC)ovenandstirringiteveryfiveminutesfor20minutes.Heatinggetstheoilflowinganddoublestheyieldofoil。
Incaseyou'
rewondering,"
cold—pressed”oilssoldcommerciallyarealsoheated,andsomearesubjectedtotheentirechemicalprocess.Thetermhasnofirmmeaningwithintheindustry,accordingtotheliteraturewe’vesurveyed.Heatingdoesnotchangethestructureoffats.Itwillnotturnpolyunsaturatedfatsintosaturatedfats.Infact,Dr。
DonaldR。
Germanninhisbook,”TheAnti-CancerDiet"
,saysthat”。
。
anunsaturatedfatmustbeheatedtohightemperatures——above425degreesF.or200degreesC。
--atleast8or10timesbeforeanyshifttowardsaturationoccurs..。
"
DeanC。
Fletcher,Ph.D。
oftheAmericanMedicalAssociationDepartmentofFoodsandNutritioninChicago,says,"
It’struethateitherhightemperatureorrepeatedheatingdoeschangethenatureofsomeoftheunsaturatedoilmolecules。
(But)theflavoroftheoilchangesasthesechemicalchangesoccur,spoilingitstaste.Thiseffectisprobablymoreprofoundthananyofthephysiologicalchangesthealteredoilmightproducewithinthebody。
”From500gm.ofheatedmash,wepressed89gm.ofoil,89percentoftheentireamountavailableandtwiceasmuchaswecouldpressfromunheatedoil!
Thedecisionisuptoyouwhetherornottoheatthemash,butthatextra50percentseemslikeanawfullot,especiallywhenthewholetechniqueissolaborintensive。
Theoilshouldbestoredintherefrigerator,andit'
sprobablybesttouseitwithinamonth,sinceithasnopreservatives.Mayonnaisemadewithsuchfreshoilsshouldbekeptrefrigeratedandusedwithintwoweeks.Theleftovercake,stillcontaining50percentofitsoil,isanutritiousadditiontoyourdishes,andmakesexcellentfeedforanimalsorwinterbir
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