Okulandelayo yizimiso ezibalulekile okufanele uzikhumbule mayelana ne-extrusion.Kufanele basize ukonga imali, bakhiqize imikhiqizo yekhwalithi ephezulu, futhi basebenzise izinto zokusebenza ngokuphumelelayo.
4. Isiphakeli sisebenza njengesipholisa.I-Extrusion iwukudluliselwa kwamandla enjini—futhi ngezinye izikhathi nezifudumezi—kuya epulasitikini epholile, ngaleyo ndlela iguqule isuke kokuqinile iye ekuncibilikeni.Okuphakelayo okungenayo kupholile kunomphongolo nezindawo eziyisikulufu endaweni yokuphakelayo.Ingaphezulu lomgqomo endaweni yokudla, nokho, cishe njalo ingaphezulu kwebanga lokuncibilika lepulasitiki.Ipholiswa ngokuthintana nezinhlayiya ezingenayo, kodwa igcinwa ishisa ngokuqhutshwa kokushisa emuva kusukela ekugcineni okushisayo, kanye nokushisisa komphongolo okulawulwayo.Ngisho nalapho icala elingaphambili ligcinwa lishisa ngenxa yokungqubuzana kwe-viscous futhi kungadingeki okokufaka kokushisa komgqomo, izifudumezi zangemuva kungase kudingeke zivulwe.Okuhlukile okubaluleke kakhulu i-grooved -feed barrel, esetshenziselwa cishe i-HDPE kuphela.
Indawo yempande yesikulufu nayo ipholiswa isifunzo futhi ivalwa odongeni lomgqomo yizinhlayiya zokuphakelayo zepulasitiki (nomoya phakathi kwazo).Uma isikulufu sima kungazelelwe, okuphakelayo kuyama, futhi indawo eyisikulufu iba ishise kakhulu endaweni yokuphakelayo njengoba ukushisa kuhamba kuhlehlela emuva kusukela ekugcineni okushisayo.Lokhu kungase kubangele ukunamathela kwezinhlayiya empandeni, noma ibhuloho.
5. Namathela emgqonyeni bese ushibilika kusikulufu, endaweni yokudla.Ukuze uthole okuqinile okuphezulu okudlulisa endaweni yokuphakelayo ye-barrel -bushelelezi, i-extruder yesikulufu esisodwa, izinhlayiya kufanele zinamathele emgqonyeni futhi zishibilike kusikulufu.Uma izinhlayiya zinamathela empandeni yesikulufu akukho okungazikhipha;umthamo wesiteshi kanye nokudla okuqinile kuyancishiswa.Ukunamathela empandeni nakho akuthandeki ngoba ipulasitiki ingase ipheke lapho futhi ikhiqize amajeli nezinhlayiya ezingcolisayo ezifanayo, noma inamathele futhi iphuke izikhawu kanye nezinguquko ezihambisanayo kusilinganiso sokuphumayo.
Amapulasitiki amaningi ngokwemvelo ashelela ezimpandeni ngoba afika epholile futhi impande ayishisi kakhulu ngenxa yokungqubuzana njengodonga lomgqomo.Ezinye izinto zokwenza kube lula ukunamathela kunezinye: i-PVC eyenziwe ngepulasitiki kakhulu, i-amorphous PET, nama-copolymers e-polyolefin athile anezinto zokunamathisela ezivame ukufunwa ekusetshenzisweni kwawo ekugcineni.
Ngokuqondene nomgqomo, ipulasitiki idinga ukunamathela lapho ukuze ikwazi ukwesulwa futhi iqhutshwe phambili yizindiza eziyisikulufa.Kufanele kube ne-coefficient ephezulu yokungqubuzana phakathi kwezinhlayiya nomgqomo, okubuye kuthonywe kakhulu izinga lokushisa elingemuva lombhobho.Uma izinhlayiya zinganamatheli bezivele zigingqike zingayi phambili—yingakho okuphakelayo okushelelayo kungalungile.
I-surface friction akuyona ukuphela kwento ethinta i-infeed.Izinhlayiya eziningi aziwuthinti umgqomo noma impande yesikulufu, ngakho-ke kufanele kube nokungqubuzana nokuxhumanisa komshini nokunamathelayo ngaphakathi kwesisindo se-pellet.
Imiphongolo ene-grooved iyicala elikhethekile.Ama-grooves asendaweni ye-feedzone, ehlukanisiwe ngokushisa kusuka kuwo wonke umgqomo futhi ipholiswe kakhulu ngamanzi.Izindiza ziphusha ama-pellets phansi emigodini futhi ngaleyo ndlela zikhule ukucindezela okukhulu kakhulu ngebanga elifushane ngokumangalisayo.Lokhu kunyuswa kokuluma kuvumela i-screw rpm ephansi ekuphumeni okufanayo, yingakho ukushisa okuncane okungqubuzanayo kukhiqizwa ekugcineni, okunikeza izinga lokushisa eliphansi lokuncibilika.Lokhu kungase kusho ukukhiqizwa okusheshayo emigqeni yefilimu ephethiwe ngokupholisa okulinganiselwe.Ama-grooves afaneleka ngokukhethekile i-HDPE, okuyipulasitiki eshelela kakhulu kuwo wonke amapulasitiki avamile ngaphandle kwe-fluoroplastics.
6. Impahla yizindleko ezinkulu.Kwezinye izimo izindleko zezinto ezibonakalayo zimelela cishe amaphesenti angu-80 yenani lezindleko zokukhiqiza—okungaphezu kwazo zonke ezinye izici ezihlanganisiwe—ngaphandle kwemikhiqizo embalwa efana nama-catheter ezokwelapha lapho ukuqinisekiswa kwekhwalithi nokupakishwa kubaluleke ngokungavamile.Lesi simiso ngokwemvelo siholela kwezinye iziphetho ezimbili: Abacubungula kufanele baphinde basebenzise ukusika nokulahlwa okuningi ngendlela abangakhona ngayo ngezindlela ezithatha indawo yezinto ezingasetshenziswa, futhi bagcine ukubekezelela ukujiya okusondele kakhulu njengoba noma yini enkulu kunobukhulu benhloso buyamoshwa futhi noma yini engaphansi kwengcuphe ukwehluleka komkhiqizo.
Isikhathi sokuthumela: May-17-2017