Taw qhia rau Rheology thiab nws qhov tseem ceeb hauv PEX Card Holders
Rheology, kev kawm txog kev ntws thiab deformation ntawm cov ntaub ntawv, plays lub luag haujlwm tseem ceeb hauv kev nkag siab txog kev ua haujlwm ntawm ntau yam polymers, suav nrog kev sib txuas ntawm polyethylene (PEX). PEX daim npav tuav, dav siv los tiv thaiv kev txheeb xyuas thiab nkag mus rau daim npav, tso siab rau cov khoom siv rheological tshwj xeeb los xyuas kom muaj kev ua haujlwm thiab ua haujlwm ntev. Nkag siab tus cwj pwm ntws ntawm PEX thaum ua tiav, nrog rau nws qhov kev ua tau zoo hauv kev ntxhov siab, muab kev nkag siab zoo rau nws qhov tsim nyog rau kev siv sib txawv. Kab lus no tshawb txog cov yam ntxwv tseem ceeb ntawm PEX, lawv qhov cuam tshuam rau daim npav tsim khoom, thiab cov yam ntxwv no cuam tshuam li cas cov khoom lag luam kawg.
Ntsiab Rheological Properties ntawm PEX
Tus cwj pwm rheological ntawm PEX feem ntau yog tus cwj pwm los ntawm nws cov viscosity, elasticity, thiab ntws tus cwj pwm nyob rau hauv cov xwm txheej sib txawv.viscosityyog ib qho kev ntsuas ntawm cov khoom tsis kam mus ntws, uas yog ib qho tseem ceeb thaum lub sij hawm tsim khoom, tshwj xeeb tshaj yog thaum extrusion los yog molding. Qhov qis viscosity feem ntau nyiam rau kev yooj yim ntawm kev ua, thaum lub viscosity siab dua yuav qhia tau tias muaj zog thiab ruaj khov hauv cov khoom kawg.Elasticityhais txog cov khoom muaj peev xwm rov qab mus rau nws qhov qub zoo tom qab deformation, uas yog qhov tseem ceeb tshwj xeeb rau cov neeg tuav daim npav uas tau rov qab khoov thiab ncab. Kev nkag siab txog cov khoom no pab cov tuam txhab ua kom zoo dua cov txheej txheem ua haujlwm thiab cov qauv tsim kom ua tiav cov txiaj ntsig xav tau rau PEX daim npav tuav.
Cov yam ntxwv cuam tshuam rau Rheological Behavior ntawm PEX
Ntau yam tuaj yeem cuam tshuam cov khoom rheological ntawm PEX, nrog rau qhov kub thiab txias, shear rate, thiab qib ntawm kev sib txuas.Kubplays lub luag haujlwm tseem ceeb hauv viscosity, raws li cua sov feem ntau txo viscosity, tso cai rau kev ua haujlwm yooj yim dua. Txawm li cas los xij, cov cua kub ntau dhau tuaj yeem cuam tshuam cov khoom siv ncaj ncees, ua rau nws tseem ceeb rau kev sib npaug ntawm qhov kub thiab txias thaum lub sij hawm tsim khoom.Shear tus nqi, los yog qhov ceev ntawm cov khoom yog deformed, kuj muaj feem xyuam rau viscosity. PEX nthuav tawm tus cwj pwm tsis yog-Newtonian, txhais tau tias nws cov viscosity hloov nrog cov nqi sib txawv. Nkag siab txog cov kev hloov pauv no tso cai rau cov tuam txhab tsim kho cov txheej txheem ua haujlwm kom ntseeg tau tias tus cwj pwm zoo txaus. Tsis tas li ntawd, lubdegree ntawm cross-linkingcuam tshuam qhov elasticity thiab lub zog ntawm PEX, ntxiv rau nws cov kev ua haujlwm rheological thiab tsim nyog rau cov ntawv thov tshwj xeeb.
Kev Tshawb Fawb Txog Kev Ntsuas Rheological Properties
Txhawm rau ntsuas cov khoom rheological ntawm PEX, ntau txoj kev sim tuaj yeem ua haujlwm. Ib qho piv txwv yogdynamic mechanical tsom xam (DMA), uas ntsuas cov khoom teb rau kev ntxhov siab oscillatory thiab muab kev nkag siab rau nws tus cwj pwm viscoelastic. Txoj kev no yuav pab txheeb xyuas qhov tsis tseem ceeb xws li kev cia khoom, kev poob qis, thiab qhov sib piv, uas yog qhov tseem ceeb rau kev nkag siab tias PEX yuav ua li cas nyob rau hauv cov xwm txheej sib txawv.Capillary rheometryyog lwm cov txheej txheem tseem ceeb siv los ntsuas qhov viscosity ntawm PEX nyob rau hauv qhov sib txawv shear tus nqi, muab cov ncauj lus kom ntxaws txog tus cwj pwm ntws thaum ua. Cov kev sim no ua rau cov tuam txhab lag luam tuaj yeem sau cov ntaub ntawv tseem ceeb uas tuaj yeem qhia txog kev hloov kho thiab kev ua haujlwm, thaum kawg ua rau kev txhim kho cov khoom zoo.
Qhov cuam tshuam rau Kev Tsim Khoom thiab Kev Tshawb Fawb Yav Tom Ntej
Txoj kev tshawb fawb ntawm cov khoom rheological ntawm PEX daim npav muaj qhov cuam tshuam loj rau kev tsim khoom. Los ntawm kev nkag siab tus cwj pwm ntws thiab cov yam ntxwv ntawm PEX, cov tuam txhab tuaj yeem txhim kho cov txheej txheem ua haujlwm, txhim kho cov khoom tsim, thiab txhim kho tag nrho cov khoom zoo. Tsis tas li ntawd, kev tshawb fawb txuas ntxiv mus rau tus cwj pwm rheological ntawm PEX tuaj yeem nthuav tawm cov qauv tshiab lossis cov khoom siv ntxiv uas tuaj yeem txhim kho nws cov khoom ntxiv, ua rau cov neeg tuav daim npav ntau dua thiab ua haujlwm tau zoo. Raws li kev ruaj ntseg dhau los ua lub ntsiab lus tseem ceeb hauv cov ntaub ntawv tshawb fawb, kev tshawb fawb rheological kev ua tau zoo ntawm bio-based lossis rov ua dua tshiab rau PEX kuj tuaj yeem dhau los ua qhov tseem ceeb ntawm kev tshawb fawb. Qhov no tsom rau ob qho tib si kev ua tau zoo thiab kev cuam tshuam ib puag ncig yuav ua rau muaj kev hloov pauv tshiab hauv kev txhim kho PEX daim npav tuav thiab cov ntawv siv zoo sib xws.
Hauv kev xaus, cov khoom rheological ntawm PEX yog qhov tseem ceeb rau kev nkag siab txog nws qhov kev ua tau zoo hauv daim npav. Cov yam ntxwv tseem ceeb xws li viscosity, elasticity, thiab qhov cuam tshuam ntawm qhov kub thiab txias thiab shear tus nqi cuam tshuam rau kev ua haujlwm thiab cov khoom kawg. Los ntawm kev siv ntau txoj kev sim los ntsuas cov khoom no, cov tuam txhab tuaj yeem txhim kho lawv cov txheej txheem tsim khoom thiab txhim kho cov kav ntev thiab kev ua haujlwm ntawm PEX daim npav tuav. Raws li kev tshawb fawb txuas ntxiv mus, lub peev xwm rau kev tsim kho tshiab hauv PEX thiab nws cov ntawv thov yuav ua lub luag haujlwm tseem ceeb hauv kev ua kom tau raws li qhov xav tau ntawm cov neeg siv khoom thiab txhawb nqa kev coj ua zoo hauv kev lag luam.