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1、StrawbalepressAbalerisapieceoffarmmachineryusedtocompressacutandrakedcrop(suchashay,straw,orsilage)intocompactbalesthatareeasytohandle,transportandstore.Severaldifferenttypesofbalersarecommonlyused,eachproducingadifferenttypeofbales一rectangularorcylindrical,of
2、varioussizes,boundwithtwine,netting,orwire.Industrialbalersarealsousedinmaterialrecyclingfacilities,primarilyforbalingmetal,plastic,orpaperfortransport.RoundbalerThemostfrequentlyusedtypeofbalerinindustrializedcountriesisthelargeroundbaler.Itproducescylinder-s
3、hapednroundHor’Tolled"bales.Grassisrolledupinsidethebalerusingrubberizedbelts,fixedrollers,oracombinationofthetwo.Whenthebalereachesapredeterminedsize,eithernettingortwineiswrappedaroundittoholditsshape.Thebackofthebalerswingsopen,andthebaleisdischarged.Thebal
4、esarecompleteatthisstage,buttheymayalsobewrappedinplasticsheetingbyabalewrapper,eithertokeephaydrywhenstoredoutsideorconvertdampgrassintosilage.Variable-chamberbalerstypicallyproducebalesfrom48to72inches(120to180cm)indiameterandupto60inches(150cm)inwidth-Theba
5、lescanweighanywherefrom1,100to2,200pounds(500to1,000kg),dependinguponsize,material,andmoisturecontent.OriginallyconceivedbyUmmoLuebbenscirca1910,thefirstroundbalerdidnotseeproductionuntil1947,whenAllis-ChalmersintroducedtheRoto-Baler.Marketedforthewater-sheddi
6、ngandlightweightpropertiesofitshaybales,AChadsoldnearly70,000unitsbytheendofproductionin1960.Thenextmajorinnovationcamein1972,whentheVermeerCompanybegansellingitsmodel605-thefirstmodernroundbaler.Previously,roundhaybaleshadbeenlittlemorethanlumpsofgrasstiedtog
7、ether,buttheVermeerdesignusedbeltstocompacthayintoacylindricalshapeasisseentoday.LargerectangularbalerAnothertypeofbalerincommonuseproduceslargerectangularbales,eachboundwithahalfdozenorsostringsoftwinewhicharethenknotted.Suchbalesarehighlycompactedandgenerall
8、yweighsomewhatmorethanroundbales.IntheprairiesofCanadatheyarecalledprairieraptors.SmallrectangularbalerAtypeofbalerwhichislesscommontodayinsomeplacesbutwhichisstillprevalentinmanyc
