Ukuze ukuziphatha rheological of polymer inyibilika ngokuchanekileyo luphawulwa extrusion processing yi Screw eyomeleleyo isenzo sokucheba..Ukuseta kunye nendlela yokucubungula idatha,esetyenziselwa ukulinganisa i-shear viscosity yepolymer enyibilikayo ngokusebenzisa i-screw extruder capillary.
Uninzi lwezixhobo zepolymer zicutshungulwa kwimeko yokuncibilika, okubandakanya ukuhamba kwe-melt kunye nokuguqulwa, okungachaphazeli kuphela inkqubo yokucubungula ngokwayo, kodwa kuchaphazela ukusebenza kokugqibela kwemveliso.Ke ngoko, ukufundwa kweepropathi ze-rheological zezinto zepolymer kube ngumxholo oshushu.Umlinganiselo ochanekileyo weeparamitha ze-rheological sisiseko sophando olunzulu lweempawu ze-rheological.
I-viscosity ye-Shear yiparameter ebalulekileyo yokubonakalisa ukuziphatha kwe-rheological.Into ebizwa ngokuba yi-shear viscosity ye-polymer melt ngumlinganiselo woxinzelelo lwe-chear kunye nesantya sokucheba esincibilika siphantsi kwenkqubo yokuhamba.Ukunyibilika kwepolymer kubangela i-pseudoplastic fluid, kunye nokuziphatha kwayo okuhambayo kuneempawu zokucheba.Ngokuqhelekileyo kuyimfuneko ukusebenzisa ijika lobudlelwane phakathi kwe-shear viscosity kunye nereyithi yokucheba, oko kukuthi i-shear viscosity spectrum, ukubonisa ngokupheleleyo iimpawu zokusetyenzwa kwe-polymer melt.
Indlela esisiseko yokulinganisa i-viscosity yokunyibilika kukuzama ukwenza ukunyibilika kuhambe kumbhobho omde kunye obhityileyo we-capillary, njengetyhubhu ye-capillary ejikelezayo.Uxinzelelo lwe-shear lungabalwa ngokulinganisa ukuhla koxinzelelo kuzo zombini iziphelo zokunyibilika njengoko zihamba nge-tube ye-capillary.Ireyithi yokucheba ingabalwa ngokulinganisa ukuhamba kwenyibilika ngexesha leyunithi.Ngaloo ndlela i-viscosity enyibilikayo inokufumaneka.
Indlela eqhelekileyo yokufumana ukunyibilika kwityhubhu ye-capillary kukusebenzisa i-piston propulsion.Inzuzo yale ndlela kukuba ISEBENZISA izixhobo zovavanyo ezimbalwa kwaye inokufumana uxinzelelo oluphezulu lokucheba.Uxinzelelo oluphezulu lwe-rheometer ye-capillary lusekelwe kulo mgaqo.Nangona kunjalo, ukungonakali kwale ndlela yokuvavanya kukuba izinto azikwazi ukuvavanywa phantsi kweemeko zangempela zokucubungula, kwaye kunzima ukufumana iimpawu ze-rheological ze-polymer zinyibilika xa zicutshungulwa.Ngokukodwa kuphononongo lokudityaniswa kokuguqulwa kwezinto ezininzi zepolymer, ukunyibilika kwepolymer kufuna intshukumo eyomeleleyo yokucheba yesikrufu ukufezekisa injongo yokudibanisa.I-rheometer ye-capillary ephezulu yoxinzelelo ayifanelekanga ukuvavanya izinto ezinjalo.
Isixhobo sokuvavanya i-screw extrusion capillary rheological inokusombulula ezi ngxaki zingentla.Isixhobo SISEBENZISA amandla okuqhubela phambili kwesikrufu ukwenza ukuba ipholima linyibilike lityhutyha ityhubhu ye-capillary.Ngoko ke, i-viscosity ye-shear ye-polymer melt inokulinganiswa phantsi kweemeko ezikufutshane nokulungiswa kwangempela.Le ndlela ifaneleke ngokukodwa ukulinganisa iimpawu ze-rheological zezixhobo ze-thermoplastic kunye nemixube yazo.Kuba umlinganiselo ulinganisa imeko-bume yokwenyani yovavanyo, iiparamitha zovavanyo ezifunyenweyo zinokuchaza ngokuchanekileyo ngakumbi ukuziphatha kwemathiriyeli ekuqhubekekeni kokwenyani.
I-Shear viscosity spectra ye-polymer enyibilikayo inokulinganiswa kusetyenziswa izixhobo zovavanyo ezikhethekileyo, ezifana noxinzelelo oluphezulu lwe-capillary rheometers, okanye ukuguqulwa okudibeneyo.Nangona kunjalo, ezi zixhobo zibiza kakhulu kwaye zilinganiselwe ekusebenziseni okubonakalayo, ngakumbi ekusetyenzisweni kwemveliso yemizi-mveliso emikhulu.Enyanisweni, akuyomfuneko ukuthembela kwisixhobo esikhethekileyo sovavanyo, okoko nje umgaqo wovavanyo we-shear viscosity, ungasebenzisa i-screw encinci elula.i-extruderkunye nokungunda kwe-capillary, zenza isixhobo sovavanyo lwe-shear viscosity spectrum esibiza ixabiso eliphantsi.Idityaniswe nokusetyenzwa kwedatha yekhompyuter, i-shear viscosity spectrum ye-polymer melt inokufumaneka ngokulula kwaye ngokukhawuleza.Le ndlela ifaneleke ngokukodwa kumashishini amancinci naphakathi ukuba aqhube uphuhliso lwemveliso kunye nokuhlolwa kwezinto eziluhlaza.
Ixesha lokuposa: Jul-26-2019