Nyob rau hauv xyoo tas los no, muaj ntau cov ntsia hlau extruder tau tsim nyob rau hauv kev ua lag luam raws li ib qho kev xaiv rau Single-ntsia hlau extruders nrog ib tug ua ntej ziab. (Ntawm no peb hu rau ntau qhov ntsia hlau extrudering system nrog rau Twin-ntsia hlau extruders, Planetary roller extruders thiab lwm yam.)
Tab sis peb xav tias nws yog ib qho tsim nyog yuav tsum muaj lub tshuab ziab khaub ncaws ua ntej txawm tias koj siv ntau cov ntsia hlau extruder. Vim:
1) Multi-ntsia hlau extruders lawv txhua tus muaj yog cov tshuab nqus tsev-degassing nyuaj heev ntsia rau ntawm extruder los tiv thaiv cov nyhuv hydrolysis los ntawm qhov tshwm sim vim tsis muaj txheej txheem ua ntej ziab. Feem ntau xws li hom extruder txawv siv cov xwm txheej:
Qhov siab tshaj plaws pub noo noo yuav tsum tsis txhob siab tshaj 3000 ppm (0.3%)
Qhov tseeb, Lub raj mis flakes qhia qhov txawv ntawm purity, particle size, particle size distribution and thickness - thiab tshwj xeeb tshaj yog nyob rau hauv av. Tom qab cov neeg siv khoom flakes tso cai khaws cia txog li 5,000 ppm ntawm cov av noo hauv cov khoom thiab khaws cia ntau zaus cov dej ntawm nws qhov chaw. Hauv qee lub tebchaws, cov dej noo noo tuaj yeem ncav cuag 14,000 ppm txawm tias ntim rau hauv Lub Hnab Loj.
Ob qho tag nrho cov ntsiab lus ntawm cov dej thiab nws cov kev hloov pauv, uas tsis tuaj yeem zam tau, yog qhov kev sib tw tiag tiag rau ntau cov ntsia hlau extruder thiab cov ntsiab lus degassing cuam tshuam. Qhov no feem ntau ua rau cov txheej txheem hloov pauv, uas pom tau los ntawm qhov sib txawv ntawm qhov tso zis ntau dhau ntawm cov extruder.Nws yog qhov ua tau tias muaj qhov tseem ceeb ntawm cov dej noo tseem nyob li nws tau mus txog nws cov theem yaj hauv lub extruder vim qhov pib ya raws theem hauv lub extruder. resin, thiab tus nqi tshem tawm thaum lub tshuab nqus tsev
2) PET yog hygroscopic heev thiab absorbs noo noo los ntawm huab cua. Me me ntawm cov dej noo yuav hydrolyze PET nyob rau hauv lub yaj theem, txo qhov hnyav molecular. PET yuav tsum qhuav ua ntej ua, thiab amorphous PET yuav tsum crystallizing ua ntej kom qhuav kom cov khoom tsis lo ua ke thaum lawv mus txawm tias hloov iav.
Hydrolysis tuaj yeem tshwm sim vim qhov dej noo thiab qhov no feem ntau tuaj yeem pom tias yog qhov txo qis hauv IV (Intrinsic Viscosity) ntawm cov khoom. PET yog "semi-crystalline". Thaum IV raug txo qis, lub raj mis yog nkig thiab zoo li ua tsis tiav ntawm "lub rooj vag" (kho taw tes) thaum tshuab thiab ntim.
Hauv nws lub xeev "crystalline" nws muaj ob qho tib si crystalline thiab amorphous feem hauv nws cov qauv molecular. Cov crystalline feem txhim kho qhov twg cov molecules tuaj yeem kho lawv tus kheej hauv cov qauv sib luag heev. Nyob rau hauv cov cheeb tsam uas tsis yog-crystalline cov molecules nyob rau hauv ib tug ntau random kev npaj. Los ntawm kev lees paub tias koj cov crystallinity siab, ua ntej ua tiav, qhov tshwm sim yuav yog cov khoom zoo dua qub thiab zoo dua.
ODE Ua IRD Infrared Rotary Drum Systems tau ua cov haujlwm ua haujlwm no hauv txoj kev siv hluav taws xob ntau dua. Tshwj xeeb tsim shortwave Infrared hluav taws xob txhawb lub molecular tshav kub hloov pauv hauv cov khoom qhuav ncaj qha yam tsis tau noj cov kauj ruam tsis zoo ntawm kev siv cua sov. Xws li cua sov txoj kev nyob rau hauv lub tshav kub-up thiab ziab lub sij hawm txo mus rau qhov ntau ntawm tsuas yog 8.5 mus rau 20 feeb nyob ntawm seb cov ntawv thov tshwj xeeb, thaum ob peb teev yuav tsum tau muab xam rau cov pa kub-cua lossis qhuav-cua tshuab.
Infrared ziab tuaj yeem txhim kho qhov kev ua tau zoo ntawm ntxaib-ntsia hlau extruder vim nws txo qhov degradation ntawm IV qhov tseem ceeb thiab txhim kho kev ruaj ntseg ntawm tag nrho cov txheej txheem.
Post lub sij hawm: Feb-24-2022