Ukuze kube nokuziphatha kwe-rheological kokuncibilika kwe-polymer kubonakala ngokunembile ekucubungulweni kwe-extrusion ngesenzo se-screw shear eqinile..Indlela yokusetha kanye nokucubungula idatha,esetshenziselwa ukulinganisa i-shear viscosity ye-polymer encibilika ngokusebenzisa i-screw extruder capillary.
Izinto eziningi ze-polymer zicutshungulwa esimweni sokuncibilika, okubandakanya ukugeleza kokuncibilika nokuguqulwa, okungathinti kuphela inqubo yokucubungula ngokwayo, kodwa futhi kuthinta ukusebenza kokugcina komkhiqizo.Ngakho-ke, ukutadisha izakhiwo ze-rheological zezinto ze-polymer kube isihloko esishisayo.Ukulinganisa okunembile kwemingcele ye-rheological kuyisisekelo sokucwaninga okujulile kwezakhiwo ze-rheological.
I-Shear viscosity iyipharamitha ebalulekile yokubonisa ukuziphatha kwe-rheological.Okubizwa ngokuthi i-shear viscosity ye-polymer melt isilinganiso sokucindezeleka kwe-shear kanye nesilinganiso sokugunda okuncibilika ngaphansi kwenqubo yokugeleza.Ukuncibilika kwe-polymer kubangela i-pseudoplastic fluid, nokuziphatha kwayo kokugeleza kunezici zokugunda kwe-shear.Ngokuvamile kudingekile ukusebenzisa ijika lobudlelwane phakathi kwe-shear viscosity kanye ne-shear rate, okungukuthi i-shear viscosity spectrum, ukukhombisa ngokugcwele izici zokucubungula ze-polymer melt.
Indlela eyisisekelo yokulinganisa i-viscosity yokuncibilika iwukuzama ukwenza ukuncibilika kugeleze eshubhuni elide nelincane le-capillary, njengeshubhu le-capillary eliyindilinga.Ukucindezeleka kwe-shear kungabalwa ngokulinganisa ukwehla kwengcindezi kuzo zombili iziphetho zokuncibilika njengoba kugeleza ngeshubhu le-capillary.Isilinganiso sokugunda singabalwa ngokulinganisa ukugeleza kokuncibilika ngesikhathi seyunithi.Ngakho-ke i-viscosity encibilikayo ingatholakala.
Indlela evamile yokukhipha ukuncibilika kwe-capillary tube ukusebenzisa i-piston propulsion.Inzuzo yale ndlela ukuthi ISEBENZISA izinto zokuhlola ezimbalwa futhi ingathola ukucindezelwa kwe-shear okuphezulu.I-rheometer ye-capillary ephezulu yokucindezela isekelwe kulesi simiso.Nokho, ukungahambi kahle kwale ndlela yokuhlola ukuthi impahla ayikwazi ukuhlolwa ngaphansi kwezimo zangempela zokucubungula, futhi kunzima ukuthola izakhiwo ze-rheological ze-polymer ziyancibilika lapho zicutshungulwa.Ikakhulukazi ocwaningweni lokuhlanganisa ukuguqulwa kwezinto ezimbalwa ze-polymer, ukuncibilika kwe-polymer kudinga isenzo esiqinile sokugunda isikulufu ukuze kufezwe injongo yokuhlanganisa.I-heometer ye-capillary yokucindezela okuphezulu ayifanele ukuhlola izinto ezinjalo.
I-screw extrusion capillary rheological test device ingaxazulula izinkinga ezingenhla.Idivayisi ISEBENZISA amandla aphehlayo wesikulufu ukwenza i-polymer encibilike igeleze ngeshubhu le-capillary.Ngakho-ke, i-viscosity ye-shear ye-polymer melt ingalinganiswa ngaphansi kwezimo eziseduze nokucubungula kwangempela.Le ndlela ifaneleka ngokukhethekile ukulinganisa izakhiwo ze-rheological ze-thermoplastic materials kanye nezingxube zazo.Ngenxa yokuthi ukulinganisa kulingisa indawo yokuhlola yangempela, imingcele yokuhlola etholiwe ingachaza ngokunembe kakhulu ukuziphatha kwezinto ekucutshungulweni kwangempela.
I-spectra ye-viscosity ye-Shear yokuncibilika kwe-polymer ingalinganiswa kusetshenziswa amathuluzi okuhlola akhethekile, njengama-heometers e-capillary pressure, noma ama-revolutions ahlanganisiwe.Kodwa-ke, le mishini iyabiza futhi ilinganiselwe ekusebenziseni okungokoqobo, ikakhulukazi ekusetshenzisweni kokukhiqizwa kwezimboni ezinkulu.Eqinisweni, akudingekile ukuthembela kuthuluzi lokuhlola elikhethekile, inqobo nje uma isimiso sokuhlola i-shear viscosity, ungasebenzisa i-single-screw elula.i-extruderkanye nesikhunta se-capillary, zakha idivayisi yokuhlola i-shear viscosity spectrum ebiza kancane.Kuhlanganiswe nokucutshungulwa kwedatha yekhompyutha, i-shear viscosity spectrum ye-polymer melt ingatholakala kalula futhi ngokushesha.Le ndlela ifaneleka ikakhulukazi amabhizinisi amancane naphakathi ukuze enze ukuthuthukiswa komkhiqizo kanye nokuhlolwa kwempahla eluhlaza.
Isikhathi sokuthumela: Jul-26-2019