Kana polima yanyungudutswa, yakasanganiswa uye kudzvanywa muextruder, inopombwa kuburikidza neextrusion die kuti irambe ichiumbwa (mushure mekutonhodza nekuomesa) kuita chigadzirwa chekupedzisira.Mhando dzinonyanya kufa dziri flat, annular uye proŽle.Zvigadzirwa zvinogadzirwa neextrusion zvinosanganisira pombi, tubing, kuvharwa newaya, mabhodhoro epurasitiki, mafirimu epurasitiki nemashiti, mabhegi epurasitiki, kukokera bepa nefoiri, Ž bres, Ž kuchema, shinda, matepi uye huwandu hwakawanda hwemafaira.
Polymer extrusion kuburikidza nekufa ine zvimwe zvakafanana kune inopisa extrusion yesimbi.Zvisinei, kunewo misiyano yakakosha.Musimbi extrusion zvinhu zvinosundirwa kumberi negondohwe, ukuwo mupolymer extrusion zvinhu zvacho zvinogara zvichipihwa nescrew inotenderera.Mukupisa simbi extrusion tembiricha dzinobva 340 ° C ye magnesium kusvika 1325 ° C yesimbi, uye zvinopindirana zvinomanikidzana zvinotangira pa 35 kusvika pamusoro pe 700 MPa.1 5 Mu polymer extrusion tembiricha haiwanzo pfuura 350 ° C, uye kumanikidza kazhinji hakuite. enda zvakanyanya pamusoro pe50 MPa pane screw tip.Solid phase extrusion yemapolymers yakagadziridzwa kugadzirwa kwezvimwe zvigadzirwa zvine simba rakawanda.Pakudziya kwakadzikira, iyo molecular orientation inopiwa nekumanikidza kwezvinhu kuburikidza nekuumbwa kwekufa kunoramba kuri muextrudate.Solid state polymer extrusion ine zvimwe zvakafanana kune inotonhora extrusion yesimbi.
Blown film extrusion ndiyo inonyanya kukosha nzira yekugadzirwa kwepurasitiki yakaonda Žfilms kubva ku polyethylenes.Polima yakanyungudutswa inobudiswa kuburikidza ne annular die (kazhinji ye spiral mandrel kuvaka) kuti iite chubhu yakatetepa yakakomberedzwa iyo panguva imwe chete inodhonzwa axially uye radially yakawedzerwa.Kazhinji kacho bhaisikopo rinoputika rinoumbwa rakatwasuka richienda kumusoro.Iyo yakanyanya bubble diameter inowanzo 1.2 - 4 nguva yakakura kupfuura dhayamita yekufa.Iyo inopisa inonyungudutswa inotonhodzwa neannular hova dzemhepo inomhanya kubva kunze kwemhepo mhete, uye dzimwe nguva zvakare kubva mukati memhepo vanogovera.Iyo solidiŽ ed Žfilm inopfuura nemufuremu inopinza pamusoro pebubble uye inotorwa nema roller.Coextruded Žfilms ane 3 - 8 layers (dzimwe nguva anosvika gumi nerimwe) anogadzirwawo nemaitiro aya, kuti ashandiswe mukurongedza chikafu.
Cast Žfilm uye sheet extrusion inosanganisira kuburitsa polima kuburikidza neafa ine kuvhura kwakakura (kusvika 10 m), pane inotonhorwa simbi roller kana rollers inodzima nekuomesa zvinhu zvakanyungudutswa.Firimu rinowanzotsanangurwa sechigadzirwa chakatetepa kupfuura 0.25 mm, ukuwo shizha rakakora kupfuura irori.The cast Žfilm process inoshandiswa pakushivirira kwakasimba kwefirimu rethinŽ, kana kuti resin yakaderera yeviscosity.Mazhinji anofa mafirati ndeeT slot kana coathanger madhizaini, ayo ane akawanda kuparadzira iyo inoyerera polymer pahupamhi hwefa, inoteverwa nechezasi nekutsinhanisa yakatetepa uye yakavhurika slits kugadzira inodiwa kuyerera kuyerera uye kudonhedza kudonha.Mazhinji mitsara yemafirimu anogadzirwa nhasi mitsara ye coextrusion, ichibatanidza mitsara kubva kune akawanda seanomwe eextruder muchigadzirwa kuburikidza neakawanda anofa, kana imwe manifold inofa nerubatsiro rwe feed blocks.
Mu Žfilm extrusion, shear mitengo pamiromo inofa kazhinji ~103 s21.Kana madziro eshear stress ichipfuura imwe kukosha (kazhinji 0.14 MPa mumapepa ekutsvagisa, yakakwirira muindasitiri nerubatsiro rwezvinowedzerwa), iyo extrudate pamusoro inorasikirwa nekupenya kwayo nekuda kweiyo sharkskin melt fracture phenomenon. zvinoonekwa neziso rakashama, perpendicular to the flow direction.
Pombi uye tubing extrusion inosanganisira kupomba yakanyungudutswa yepolymer kuburikidza neanannulardie, ichitevera iyo yakawedzera chigadzirwa, ichidhonzwa, inopfuura nepavacuum sizer iyo inowana zviyero zvayo zvekupedzisira.Izvi zvinoteverwa nepfapfaidzo kana kunyudza kutonhora uye kucheka kune hurefu hwakatarwa.Pombi yedhayamita inosvika 2 m kana kupfuura inogadzirwa nekuita uku, uye tubing ine madhayamita kubva pa10 mm zvichidzika kusvika pazasi 1 mm.Iyo annular inofa inowanzo ye spider kana spiral mandrel dhizaini.
Mune waya uye tambo yekuputira maitiro, waya yega kana waya maassemblies anodhonzwa nekumhanya kwakanyanya kuburikidza ne crosshead die, pamakona ekurudyi kune extruder axis.Mukudzvinyirirwa kwakanyanya, iyo polymer inonyungudika inosangana newaya kana tambo isati yabuda, semuenzaniso insulating yewaya dzega.Mune yakaderera pressure extrusion, iyo melt inosangana netambo mushure mekubuda kwekufa, semuenzaniso jaketi remagungano etambo dzakasungirirwa.Yakanyanya kukwirira shear mitengo inowanzosangana mune iyi maitiro (kusvika ku106 s2 1) uye yakaderera viscosity resins inoshandiswa.
ProŽfile extrusion inzira yekugadzira inoshandiswa kune zvigadzirwa zveanogara achiyambuka-chikamu.Izvi zvinogona kubva kune akareruka maumbirwo kuenda kune akanyanya kuomarara maprofile ane akawanda makamuri uye Žminwe.Mienzaniso kubva pakuumbwa kwemafuremu emifananidzo, kuenda kukugadzira mota, kuenda kumicheto yematafura etafura, kusvika kumitsara yemahwindo.Zvishandiso zvakawedzerwa zvakaiswa classiŽ ed (zvichida) seyakaomarara kana inochinjika.Iyo yakajairwa proŽle extrusion line ine extruder inopomba polima kuburikidza neproŽle die, inoteverwa nesaizi tank kana calibrator, mamwe madhiri ekutonhodza, chinodhonza uye cutoff mudziyo.Dhizaini yeprofile inofa inoda ruzivo rwakakura uye moyo murefu. Zvimisikidzo zvekubuda muprofile extrusion zvinosanganikwa nazvo nekuda kweiyo sharkskin (yezvigadzirwa zvitete zvinogadzirwa kubva kune yakakwirira viscosity mapolymers) kana kugona kutonhodza zvikobvu zvakakomberedzwa nemadziro.Polymer pombi uye proŽfile extrusion yakafanana neiyo inopisa extrusion yesimbi yekugadzira inoenderera isina maburi maumbirwo ezvinhu zvakaita sebar.Nekudaro, iyo yemasvomhu modhi yeaya maitiro emasimbi akavakirwa zvakanyanya pa elastic - epurasitiki kuyerera kwekufungidzira.
Mukunyunguduka kunyunguduka, iyo polima yakanyungudutswa inokwira kuburikidza neakawanda capillaries mu spinneret (kusvika 1000).Iyo polymer inounzwa pasi pekumanikidzwa nepombi yegiya yekuyeresa mita, mushure mekupfuura nemu Ž lter iyo inotevera extruder.Pakubuda kwema capillaries, iyo Ž inochema inoderedzwa kusvika kune yaidiwa dhayamita.Nokuda kwekugadzirwa kwe Žfibres dzakaonda kwazvo, kunyunguduka kunoshandiswa kunoshandiswa.Mukuita uku Ž bres inodzvinyirirwa nesimba rekukweva rinoitwa nejeti remhepo remhepo.
Nguva yekutumira: Kubvumbi-19-2017