PET (polyethylene terephthalate) yog siv dav siv thermoplastic polymer rau ntau yam kev siv, xws li ntim, textiles, thiab engineering. PET muaj cov khoom siv zoo heev, thermal, thiab kho qhov muag, thiab tuaj yeem rov ua dua thiab rov siv dua rau cov khoom tshiab. Txawm li cas los xij, PET kuj yog cov khoom siv hygroscopic, uas txhais tau tias nws nqus dej noo los ntawm ib puag ncig, thiab qhov no tuaj yeem cuam tshuam rau nws qhov zoo thiab kev ua haujlwm. Cov dej noo hauv PET tuaj yeem ua rau hydrolysis, uas yog tshuaj lom neeg cov tshuaj tiv thaiv uas rhuav tshem cov saw hlau polymer thiab txo cov viscosity (IV) ntawm cov khoom. IV yog ib qho kev ntsuas ntawm qhov hnyav molecular thiab qib ntawm polymerization ntawm PET, thiab nws yog ib qho tseem ceeb qhia txog lub zog, nruj, thiab kev ua tau zoo ntawm cov khoom. Yog li ntawd, nws yog ib qho tseem ceeb kom qhuav thiab crystallize PET ua ntej extrusion, kom tshem tawm cov dej noo thiab tiv thaiv qhov poob ntawm IV.
Infrared Crystal tshuab tshuab PET Granulationyog ib qho tshiab thiab cov thev naus laus zis tshiab uas siv lub teeb infrared (IR) kom qhuav thiab crystallize PET flakes hauv ib kauj ruam, ua ntej pub rau lawv rau extruder rau kev ua ntxiv. IR lub teeb yog ib hom hluav taws xob hluav taws xob hluav taws xob uas muaj lub wavelength ntawm 0.7 thiab 1000 microns, thiab tuaj yeem nqus tau los ntawm PET thiab dej molecules, ua rau lawv vibrate thiab ua kom sov. IR lub teeb tuaj yeem nkag mus rau hauv PET flakes thiab cua sov los ntawm sab hauv, ua rau kom qhuav sai thiab ua kom muaj zog ntau dua li cov qauv siv, xws li cua kub lossis lub tshuab nqus tsev ziab.
Infrared siv lead ua tshuab ziab khaub ncaws PET Granulation muaj ntau yam zoo dua li kev ziab thiab crystallization, xws li:
• Txo kom qhuav thiab crystallization lub sij hawm: Lub teeb IR tuaj yeem qhuav thiab crystallize PET flakes hauv 20 feeb, piv rau ob peb teev uas yuav tsum tau ua los ntawm cov qauv qub.
• Txo kev siv hluav taws xob: Lub teeb IR tuaj yeem qhuav thiab crystallize PET flakes nrog kev siv zog ntawm 0.08 kWh / kg, piv rau 0.2 txog 0.4 kWh / kg xav tau los ntawm cov txheej txheem pa.
• Txo cov dej noo: Lub teeb IR tuaj yeem qhuav thiab crystallize PET flakes mus rau qhov kawg ntawm cov dej noo tsawg dua 50 ppm, piv rau 100 txog 200 ppm ua tiav los ntawm cov txheej txheem ib txwm ua.
• Txo IV poob: Lub teeb IR tuaj yeem qhuav thiab crystallize PET flakes nrog qhov tsawg kawg IV poob ntawm 0.05, piv rau 0.1 txog 0.2 IV poob los ntawm cov txheej txheem ib txwm ua.
• Ntau qhov ntom ntom: Lub teeb IR tuaj yeem ua kom qhov ntom ntom ntawm PET flakes los ntawm 10 mus rau 20%, piv rau qhov qub ntom, uas txhim kho cov khoom noj khoom haus thiab cov khoom tsim tawm ntawm extruder.
• Txhim kho cov khoom zoo: Lub teeb IR tuaj yeem qhuav thiab crystallize PET flakes yam tsis ua rau yellowing, degradation, los yog paug, uas txhim kho cov tsos thiab cov khoom ntawm cov khoom kawg.
Nrog rau cov txiaj ntsig zoo no, Infrared siv lead ua tshuab ziab khaub ncaws PET Granulation tuaj yeem txhim kho kev ua haujlwm zoo thiab zoo ntawm PET extrusion, thiab tuaj yeem ua tau raws li cov kev cai ntawm cov ntawv thov zaub mov.
Cov txheej txheem ntawm Infrared siv lead ua tshuab PET Granulation tuaj yeem muab faib ua peb kauj ruam tseem ceeb: pub, ziab thiab crystallizing, thiab extruding.
Pub
Thawj kauj ruam ntawm Infrared siv lead ua tshuab ziab khaub ncaws PET Granulation yog pub. Hauv cov kauj ruam no, PET flakes, uas tuaj yeem ua nkauj xwb lossis rov siv dua, tau muab tso rau hauv lub tshuab ziab khaub ncaws IR los ntawm cov ntsia hlau feeder lossis lub hopper. PET flakes tuaj yeem muaj cov ntsiab lus ntawm cov dej noo thawj zaug txog 10,000 txog 13,000 ppm, nyob ntawm qhov chaw thiab qhov chaw cia khoom. Tus nqi pub mis thiab qhov tseeb yog qhov tseem ceeb uas cuam tshuam rau kev ziab thiab crystallization kev ua tau zoo thiab cov khoom zoo.
Qhuav thiab crystallizing
Qhov thib ob theem ntawm Infrared siv lead ua tshuab ziab khaub ncaws PET Granulation yog ziab thiab crystallizing. Hauv cov kauj ruam no, PET flakes raug rau IR teeb nyob rau hauv lub nruas rotating, uas muaj ib tug kauv channel thiab paddles ntawm nws sab hauv. Lub teeb IR yog tawm los ntawm lub txhab nyiaj nyob ruaj khov ntawm IR emitters, uas nyob hauv nruab nrab ntawm lub nruas. IR lub teeb muaj lub wavelength ntawm 1 mus rau 2 microns, uas yog tuned rau qhov nqus spectrum ntawm PET thiab dej, thiab tuaj yeem nkag mus txog li 5 hli rau hauv PET flakes. Lub teeb IR ua kom sov lub PET flakes los ntawm sab hauv, ua rau cov dej molecules evaporate thiab PET molecules kom vibrate thiab rearrange mus rau hauv ib tug crystalline qauv. Cov dej vapor raug tshem tawm los ntawm cov kwj ntawm huab cua ambient, uas ntws los ntawm lub nruas thiab nqa cov dej noo mus. Cov kauv channel thiab cov paddles xa cov PET flakes raws lub axis ntawm lub nruas, kom ntseeg tau tias muaj kev sib txuam thiab sib luag ntawm IR teeb. Cov txheej txheem ziab thiab crystallizing yuav siv sijhawm li 20 feeb, thiab ua rau cov dej noo kawg ntawm tsawg dua 50 ppm thiab tsawg kawg IV poob ntawm 0.05. Cov txheej txheem ziab thiab crystallizing kuj ua rau cov khoom ntom ntom ntawm PET flakes los ntawm 10 mus rau 20%, thiab tiv thaiv yellowing thiab degradation ntawm cov khoom.
Extruding
Qhov thib peb thiab kawg kauj ruam ntawm Infrared siv lead ua tshuab ziab khaub ncaws PET Granulation yog extruding. Nyob rau hauv cov kauj ruam no, cov qhuav thiab crystallized PET flakes yog pub rau lub extruder, uas melts, homogenizes, thiab shapes cov khoom rau hauv cov khoom uas xav tau, xws li pellets, fibers, films, los yog fwj. Lub extruder tuaj yeem yog ib leeg-ntsia hlau lossis hom ntxaib-ntsia hlau, nyob ntawm cov khoom tshwj xeeb thiab cov khoom siv ntxiv. Lub extruder kuj tseem tuaj yeem nruab nrog lub tshuab nqus tsev, uas tuaj yeem tshem tawm cov seem seem lossis cov volatiles ntawm cov yaj. Cov txheej txheem extruding yog cuam tshuam los ntawm cov ntsia hlau ceev, ntsia hlau configuration, chim kub, tuag geometry, thiab yaj rheology. Cov txheej txheem extruding yuav tsum tau ua kom zoo kom ua tiav qhov zoo thiab ruaj khov extrusion, tsis muaj qhov tsis xws luag, xws li tawg tawg, tuag o, lossis qhov tsis txaus ntseeg. Cov txheej txheem extruding kuj tuaj yeem ua raws li cov txheej txheem tom qab kev kho mob, xws li txias, txiav, lossis sib sau, nyob ntawm cov khoom siv thiab cov khoom siv hauv qab.
Xaus
Infrared siv lead ua tshuab ziab khaub ncaws PET Granulation yog ib qho tshiab thiab cov thev naus laus zis tshiab uas siv IR lub teeb kom qhuav thiab crystallize PET flakes hauv ib kauj ruam, ua ntej pub rau cov extruder rau kev ua haujlwm ntxiv. Cov thev naus laus zis no tuaj yeem txhim kho qhov ua tau zoo thiab qhov zoo ntawm PET extrusion, los ntawm kev txo lub sijhawm ziab thiab crystallization, kev siv lub zog, cov ntsiab lus noo noo, thiab IV poob, thiab los ntawm kev ua kom ntau qhov ntom ntom thiab cov khoom zoo. Cov thev naus laus zis no tuaj yeem ua tau raws li cov kev xav tau ntawm cov ntawv thov zaub mov, los ntawm kev khaws cia IV thiab tiv thaiv kom tsis txhob daj thiab degradation ntawm PET. Cov thev naus laus zis no tuaj yeem pab txhawb kev ruaj khov thiab kev lag luam ncig ntawm PET, los ntawm kev ua kom rov ua dua tshiab thiab rov siv PET rau cov khoom tshiab.
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Post lub sij hawm: Jan-25-2024