PP/PE/PA/PETG/EVOH Multilayer Barrier Sheet Co-extrusion Line
Cov Txheej Txheem Tseem Ceeb
| Qauv kab | Qauv Extruder | Cov khoom dav | Cov khoom tuab | Tsim cov zis tawm extrusion |
| 7 txheej co-extrusion | 120/75/50/60/75 | 800-1200 hli | 0.2-0.5 hli | 500-600kg/teev |
| 9 txheej co-extrusion | 75/100/60/65/50/75/75 | 800-1200 hli | 0.05-0.5 hli | 700-800kg/teev |
Lus Cim: Cov lus qhia yuav hloov pauv yam tsis tau ceeb toom ua ntej.
Cov xwm txheej ua lag luam ntawm EVOH ntim daim ntawv thov
Hauv kev ntim khoom noj txias, tib neeg siv cov khoom siv hlau lossis iav ua cov khoom ntim khoom noj kom cais tau qhov nkag mus ntawm ntau yam roj hauv thiab sab nraud kom ntseeg tau tias cov ntsiab lus zoo thiab tus nqi khoom. Vim tias muaj peb yam tseem ceeb uas ua rau cov khoom noj puas tsuaj: cov yam ntxwv ntawm lub cev (cov tshuaj tiv thaiv enzyme hauv lub cev, thiab lwm yam), cov yam ntxwv tshuaj lom neeg (feem ntau yog oxidation ntawm cov khoom noj) thiab cov yam ntxwv lub cev (hygroscopic, ziab, thiab lwm yam). Cov yam ntxwv no ua lub luag haujlwm hauv cov xwm txheej ib puag ncig xws li oxygen, lub teeb, kub, noo noo, thiab lwm yam, uas ua rau cov khoom noj puas tsuaj. Kev tiv thaiv kev puas tsuaj ntawm cov khoom noj yog feem ntau yog tiv thaiv kev loj hlob ntawm cov kab mob me me hauv cov khoom noj, tiv thaiv kev oxidation ntawm cov khoom noj los ntawm oxygen, thiab tiv thaiv cov dej noo thiab tswj cov saj qub ntawm cov khoom noj.
Ethylene-vinyl cawv copolymer, hu ua EVOH, yog lub npe hu ua peb lub ntiaj teb cov khoom thaiv loj tshaj plaws ua ke nrog polyvinylidene chloride (PVDC) thiab polyamide (PA) [2]. EVOH tuaj yeem tiv thaiv kev nkag mus ntawm cov pa oxygen hauv huab cua rau hauv cov zaub mov, yog li ntawd tiv thaiv kev tsim cov tshuaj lom thiab lwm yam tshuaj lom vim yog kev loj hlob ntawm cov kab mob me me, thiab tseem tuaj yeem tiv thaiv kev hloov pauv ntawm cov khoom los ntawm oxidation, thaum tswj cov tshuaj tsw qab thiab tiv thaiv kev ua qias tuaj ntawm cov ntxhiab sab nraud. Ntxiv mus, qhov tsis muaj cov khoom thaiv dej noo tuaj yeem them los ntawm lwm cov txheej polyolefin. Yog li ntawd, EVOH cov ntaub ntawv ntim khoom ntau txheej tuaj yeem tiv thaiv kev puas tsuaj ntawm cov zaub mov thiab ntev lub neej txee. Tsis tas li ntawd, nws yooj yim rau kev ua thiab tsim, thiab muaj kev ua tau zoo tiv thaiv ib puag ncig. Vim yog cov khoom tiv thaiv roj zoo heev, pob tshab, kev ua haujlwm thiab kev tiv thaiv cov kuab tshuaj ntawm EVOH resin, nws cov teb thov tau dav dua thiab dav dua, thiab qhov kev thov kuj tseem loj hlob sai.
Cov khoom siv EVOH siab heev
1. Cov khoom siv
Cov khoom thaiv ntawm EVOH Cov khoom thaiv ntawm cov ntaub ntawv polymer hais txog lub peev xwm tiv thaiv ntawm cov khoom rau cov pa roj me me, kua, dej pa, thiab lwm yam. Tam sim no feem ntau siv cov resin ntau yam nrog cov khoom thaiv zoo suav nrog: EVOH, PVDC, PAN, PEN, PA thiab PET.
2. Thaum EVOH siv ua cov khoom siv thaiv siab, nws feem ntau siv cov qauv sib xyaw ua ke ntau txheej. Cov ntaub ntawv sib xyaw ua ke feem ntau yog: PP, HIPS, PE, EVOH, AD, thiab AD yog cov nplaum hauv cov qauv. Cov qauv sib xyaw ua ke ntau txheej tuaj yeem ua si tag nrho rau cov yam ntxwv ntawm txhua yam khoom, txhim kho kev tiv thaiv dej ntawm EVOH, thiab tau txais cov khoom siv thaiv siab nrog cov yam ntxwv zoo heev. Feem ntau ntawm lawv tau siv rau hauv cov ntim khoom yooj ywm yav dhau los, tab sis cov khoom sib xyaw ua ke xws li PP, PE, thiab PA tsis yooj yim rau punch vim lawv cov tawv zoo thiab tsis khov kho, uas txwv lawv daim ntawv thov hauv thaj chaw ntawm cov ntim khoom khov kho, tshwj xeeb tshaj yog hauv cov khoom sau online. Polystyrene tiv taus kev cuam tshuam HIPS muaj kev khov kho zoo thiab cov khoom molding zoo heev, haum rau punching thiab haum rau cov ntaub ntawv ntim khoom tawv. Yog li ntawd, nws yog qhov tseem ceeb tshwj xeeb los tsim cov ntaub ntawv sib xyaw ua ke EVOH siab thaiv uas haum rau cov ntim khoom tawv.
Vim yog qhov tsis sib xws ntawm EVOH resin thiab HIPS resin, thiab qhov sib txawv loj ntawm cov resin rheology rate, lub zog sib txuas ntawm cov substrate thiab EVOH, qhov yuav tsum tau ua rau cov khoom tensile ntawm EVOH thaum lub sijhawm molding theem ob, thiab EVOH txheej faib thaum lub sijhawm calendering los tsim cov ntawv sib xyaw. Kev sib xws ntawm cov ntaub ntawv sib xyaw yog txhua yam teeb meem tseem ceeb uas cuam tshuam rau kev ua tau zoo thiab kev siv cov ntaub ntawv sib xyaw, thiab kuj yog cov teeb meem nyuaj uas yuav tsum tau daws thaum tsim cov ntaub ntawv sib xyaw no.
Tus yuam sij rau cov thev naus laus zis ntau txheej co-extrusion yog cov nplaum (AD). Cov ntaub ntawv ntim khoom sib xyaw ntawm EVOH feem ntau muaj PPEVOH, tab sis PP thiab EVOH tsis tuaj yeem sib txuas ncaj qha los ntawm cua sov, thiab yuav tsum ntxiv cov nplaum (AD) ntawm PP thiab EVOH. Thaum xaiv cov nplaum, nws yog qhov tsim nyog los xav txog cov nplaum ntawm PP ua cov khoom siv hauv paus, qhov thib ob yog qhov sib phim ntawm cov viscosity yaj ntawm PP thiab EVOH, thiab qhov thib peb yog qhov xav tau ntawm cov khoom tensile, kom tsis txhob muaj kev tawg thaum lub sijhawm ua tiav theem ob. Yog li ntawd, cov ntawv co-extruded feem ntau yog tsib txheej co-extruded ntawv (PPADEVOHADPP). /AD/EVOH/AD/R/PP, txheej sab nraud tshaj plaws yog cov khoom siv tshiab PP, thiab ob txheej ntxiv yog PP crushed recycled khoom R(PP). Cov qauv asymmetric kuj tseem siv tau, thiab lwm yam khoom siv (PE/HIPS, thiab lwm yam) extruders tuaj yeem ntxiv rau co-extrusion. Lub hauv paus ntsiab lus yog tib yam, thiab tib txoj kev co-extrusion ntau txheej tuaj yeem ua tiav.
Daim Ntawv Thov
Cov khoom siv EVOH muaj cov yam ntxwv zoo thaiv. Los ntawm kev siv tshuab co-extrusion nrog PP, PE, PA, PETG thiab lwm yam khoom siv, nws tuaj yeem ua tiav rau hauv 5-txheej, 7-txheej, thiab 9-txheej cov khoom ntim khoom sib dua, feem ntau yog siv rau hauv cov ntim aseptic, dej haus jelly, khoom noj mis nyuj, ntses txias thiab cov khoom noj nqaij ntim thiab lwm yam. Hauv qhov tsis yog khoom noj, nws yog siv rau hauv kev lag luam tshuaj, cov khoom ntim volatile thiab lwm yam teb, nrog cov yam ntxwv zoo heev, uas ua rau lub txee txee ntawm cov khoom zoo dua.
