PP / PE / PA / PETG / EVOH Multilayer Barrier Sheet Co-extrusion Kab
Main Technical Parameter
| Kab qauv | Extruder qauv | Cov khoom dav | Khoom thickness | Tsim extrusion tso zis |
| 7 txheej co-extrusion | 120/75/50/60/75 | 800-1200 hli | 0.2-0.5 hli | 500-600kg / h |
| 9 txheej co-extrusion | 75/100/60/65/50/75/75 | 800-1200 hli | 0.05-0.5 hli | 700-800kg / h |
Nco tseg: Cov kev qhia tshwj xeeb yuav hloov pauv yam tsis tau ceeb toom ua ntej.
Kev lag luam xwm txheej ntawm EVOH ntim daim ntawv thov
Hauv kev ntim khoom noj khoom haus txias, cov neeg siv cov khoom siv hlau lossis iav los ua cov ntim khoom noj kom zoo cais tawm ntawm cov khoom siv roj ntau sab hauv thiab sab nraud kom ntseeg tau qhov zoo ntawm cov khoom thiab cov khoom muaj nqis. Vim tias muaj peb yam tseem ceeb uas ua rau cov zaub mov tsis zoo: cov khoom noj khoom haus lom neeg (cov tshuaj lom neeg lom neeg, thiab lwm yam), tshuaj lom neeg (feem ntau yog oxidation ntawm cov khoom noj khoom haus) thiab lub cev (hygroscopic, ziab, thiab lwm yam). Cov yam ntxwv no ua lub luag haujlwm hauv ib puag ncig xws li oxygen, lub teeb, kub, noo noo, thiab lwm yam, uas ua rau cov zaub mov lwj. Kev tiv thaiv kev tsis zoo ntawm cov khoom noj yog tsuas yog inhibit qhov kev loj hlob ntawm cov kab mob hauv cov zaub mov, tiv thaiv oxidation ntawm cov khoom noj los ntawm cov pa oxygen, thiab tiv thaiv cov dej noo thiab tswj cov khoom qub ntawm cov khoom noj.
Ethylene-vinyl cawv copolymer, hu ua EVOH, yog lub npe hu ua lub ntiaj teb peb qhov loj tshaj plaws barrier resins 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 inhibiting kev tsim cov co toxins thiab lwm yam teeb meem vim kev loj hlob ntawm cov kab mob, thiab tseem tuaj yeem tiv thaiv kev hloov pauv los ntawm oxidation, thaum tuav cov tshuaj tsw qab thiab tiv thaiv cov ntxhiab tsw phem. Tsis tas li ntawd, qhov tsis muaj noo noo thaiv cov khoom tuaj yeem raug them los ntawm lwm cov txheej polyolefin. Yog li, EVOH cov ntaub ntawv ntim ntau txheej tuaj yeem tiv thaiv cov khoom noj khoom haus zoo thiab ua kom lub neej ntev. Tsis tas li ntawd, nws yooj yim rau txheej txheem thiab tsim, thiab muaj kev tiv thaiv ib puag ncig zoo. Vim muaj cov khoom siv roj zoo heev, pob tshab, kev ua haujlwm thiab cov kuab tshuaj tiv thaiv ntawm EVOH resin, nws daim ntawv thov teb tau dav thiab dav dua, thiab qhov kev thov tseem loj hlob sai.
High barrier EVOH cob
1. Cov khoom siv
Cov khoom thaiv ntawm EVOH Cov khoom thaiv ntawm cov khoom siv polymer xa mus rau kev tiv thaiv kev muaj peev xwm ntawm cov khoom lag luam rau cov roj molecular me me, kua, dej vapor, thiab lwm yam. Tam sim no feem ntau siv cov resin ntau yam nrog cov khoom thaiv zoo xws li: EVOH, PVDC, PAN, PEN, PA thiab PET.
2. Thaum EVOH yog siv los ua cov khoom siv tiv thaiv siab, nws feem ntau siv cov txheej txheem ntau txheej. Cov khoom siv feem ntau siv yog: PP, HIPS, PE, EVOH, AD, thiab AD yog cov nplaum hauv cov qauv. Cov txheej txheem sib xyaw ua ke tuaj yeem muab kev ua si tag nrho rau cov khoom ntawm txhua yam khoom, txhim kho cov dej tsis kam ntawm EVOH, thiab tau txais cov khoom siv siab uas muaj cov khoom zoo heev. Feem ntau ntawm lawv tau siv rau hauv kev ntim khoom yooj yim yav dhau los, tab sis cov khoom sib xyaw xws li PP, PE, thiab PA tsis yooj yim rau xuas nrig ntaus vim lawv qhov zoo toughness thiab tsis zoo rigidity, uas txwv tsis pub lawv daim ntawv thov nyob rau hauv lub teb ntawm nruj ntim, tshwj xeeb tshaj yog nyob rau hauv cov khoom. online filling khoom. Kev cuam tshuam-resistant polystyrene HIPS muaj rigidity zoo thiab zoo heev molding zog, haum rau xuas nrig ntaus thiab haum rau cov khoom ntim nyuaj. Yog li ntawd, nws yog ib qho tseem ceeb heev uas yuav tsum tau siv zog tsim EVOH high-barrier composite cov ntaub ntawv tsim nyog rau cov ntim nyuaj.
Vim tias qhov tsis sib haum xeeb ntawm EVOH resin thiab HIPS resin, thiab qhov sib txawv loj ntawm resin rheology tus nqi, lub zog sib txuas ntawm cov substrate thiab EVOH, cov kev xav tau rau cov khoom tensile ntawm EVOH thaum lub sij hawm nruab nrab molding, thiab EVOH txheej faib thaum lub sij hawm calendering rau tsim cov nplooj ntawv sib xyaw Cov khoom sib xyaw ua ke yog txhua yam teeb meem tseem ceeb cuam tshuam rau kev ua haujlwm thiab kev siv cov ntaub ntawv sib xyaw, thiab tseem yog cov teeb meem nyuaj uas yuav tsum tau daws thaum tsim cov ntaub ntawv zoo li no.
Tus yuam sij rau cov txheej txheem ntau txheej co-extrusion yog cov nplaum (AD). Cov ntaub ntawv ntim khoom sib xyaw ntawm EVOH feem ntau suav nrog PPEVOH, tab sis PP thiab EVOH tsis tuaj yeem ncaj qha thermally bonded, thiab cov nplaum (AD) yuav tsum tau ntxiv ntawm PP thiab EVOH. Thaum xaiv cov nplaum, nws yog ib qho tsim nyog yuav tsum xav txog cov nplaum ntawm PP raws li cov khoom siv hauv paus, qhov thib ob yog qhov sib txuam ntawm cov yaj viscosity ntawm PP thiab EVOH, thiab qhov thib peb yog qhov yuav tsum tau muaj cov khoom tensile, thiaj li tsis txhob delamination thaum theem nrab. ua. Yog li ntawd, cov nplooj ntawv co-extruded feem ntau yog tsib-txheej co-extruded nplooj ntawv (PPADEVOHADPP). / AD / EVOH / AD / R / PP, txheej txheej sab nrauv yog PP cov khoom siv tshiab, thiab lwm yam ob txheej yog PP crushed siv cov khoom siv R (PP). Asymmetric qauv tuaj yeem siv tau, thiab lwm yam khoom siv (PE / HIPS, thiab lwm yam) extruders tuaj yeem muab ntxiv rau co-extrusion. Lub hauv paus ntsiab lus yog tib yam, thiab tib txheej txheej txheej co-extrusion tuaj yeem ua tiav.
Daim ntawv thov
Cov khoom siv EVOH muaj cov khoom thaiv zoo. Los ntawm kev siv tshuab co-extrusion nrog PP, PE, PA, PETG thiab lwm yam ntaub ntawv, nws tuaj yeem ua tiav rau hauv 5-txheej, 7-txheej, thiab 9-txheej siab-txheej txheem ntim cov ntaub ntawv, feem ntau yog siv hauv ntim aseptic, jelly dej qab zib, cov khoom noj siv mis, cov ntses txias thiab cov khoom noj nqaij ntim khoom noj thiab lwm yam hauv cov khoom tsis yog khoom noj, nws yog siv rau hauv kev lag luam, ntim cov kuab tshuaj tsis muaj zog thiab lwm yam kev lag luam, nrog rau cov khoom thaiv zoo heev, uas zoo heev txhim kho lub txee lub neej ntawm cov khoom.
