Cov txheej txheem ua tiav ntawm EVOH siab- cov yeeb yaj kiab barrier nyob ntawm cov khoom tsim, cov kev cai barrier, thickness thiab daim ntawv thov. Vim tias EVOH feem ntau siv los ua cov txheej txheem ua haujlwm siab, nws feem ntau ua tiav nrog cov ntaub ntawv xws li PE, PP lossis PA es tsis nyob hauv kev sib cais. Muaj ntau ntau txoj kev kho mob:
1.Multilayer Co-extrusion Blown Film
Multilayer co-extrusion blown film yog ib txoj hauv kev rau kev npaj EVOH siab-barrier films. Thaum lub sij hawm tsim khoom, cov resins sib txawv yog melted thiab plasticized nyob rau hauv cais extruders, ces ua ke los ntawm ntau txheej txheej ntawm coextruding pwm los tsim ib txheej txheej. Cov resin yog ces inflated, txias thiab rub los tsim cov zaj duab xis zaum kawg.
EVOH feem ntau muab cov khoom tiv thaiv oxygen, thaum cov ntaub ntawv xws li PE muab thermal sealing thiab txhua yam muaj zog. Cov txheej txheem tsim nyog rau kev tsim ntau yam ntawm cov yeeb yaj kiab siab xws li cov hnab ntim khoom noj thiab lub tshuab nqus tsev ntim cov yeeb yaj kiab.
2.Multilayer Co-extrusion Cast Film
Multilayer co-extrusion casting koom nrog extruding ntau molten resins los ntawm ntau txheej txheej ntawm tuag thiab ceev ceev cov extrudate ntawm ib tug txias rau cov menyuam los ua ib tug nyias zaj duab xis.
Piv nrog rau cov txheej txheem tshuab, cov txheej txheem casting feem ntau muaj qhov zoo ntawm thickness uniformity, nto smoothness thiab siab transparency, uas yog haum rau ntim khoom nrog high precision thiab tsos.
3.Multilayer Co-extrusion
Multilayer co-extrusion tso cai rau cov txheej txheem EVOH tso ncaj qha rau hauv cov txheej txheem zaj duab xis nyias, ua rau cov khoom sib xyaw uas muaj cov khoom siv xws li PE, PP lossis PA.
Piv txwv li, cov qauv xws li "PE / khi txheej / EVOH / khi txheej / PE" tuaj yeem tsim los ua kom cov khoom sib txawv kom ua tiav cov haujlwm tshwj xeeb xws li kev sib khi thaum tshav kub kub, kev tiv thaiv kev tiv thaiv thiab kev txhawb nqa txhua yam.
Txoj kev no txo cov kev xav tau rau cov kauj ruam tom ntej lamination thiab pab txhawb kev hloov kho ntawm daim nyias nyias mus rau qhov kawg - siv.
4. Extrusion Lamination
Extrusion laminates siv cov molten resin ua cov txheej txheem los tuav cov khoom sib txawv ua ke.
Nyob rau hauv EVOH siab-kev ntim cov khoom thaiv, cov ntaub ntawv thaiv tuaj yeem ua ke nrog lwm cov yeeb yaj kiab lossis cov substrates los txhim kho cov khoom siv dag zog, thermal sealing thiab cov khoom thaiv kev ua haujlwm ntawm tag nrho cov pob.
5. Lamination qhuav
Qhuav lamination tsuas yog siv cov nplaum los khi cov ntaub ntawv sib txawv. Rau siab barrier ntim nrog cov qauv complex, nws yog ua tau rau cov ntaub ntawv sib xyaw ua ke raws li cov kev ua tau zoo ntawm cov khoom. Cov txheej txheem muaj cov txheej txheem zoo heev, haum rau cov khoom noj, tshuaj, cov khoom tu tus kheej thiab lwm yam kev lag luam hauv kev tsim cov ntim khoom sib xyaw.
6. Thaum tshav kub kub ua
Qee yam EVOH-raws li cov ntaub ntawv thaiv ntau txheej kuj tuaj yeem ua cov thermoformed los tsim cov tais zaub mov, ntim ntim thiab lwm yam khoom ntim pwm.
Nyob rau hauv tus txheej txheem ntawm kub molding, lub cua kub kub, molding ceev thiab tensile℃yuav tsum tau tswj kom tsim nyog. Lub overstretching ntawm lub fencing txheej yuav cuam tshuam qhov kev ua tau zoo ntawm qhov kawg fencing, yog li cov txheej txheem tsis yuav tsum tau kho raws li cov khoom siv tshwj xeeb.
Cov ntsiab lus
Cov txheej txheem ua haujlwm ntawm EVOH siab-cov yeeb yaj kiab thaiv yog ntau txheej co-extrusion cua tshuab, multilayer co-extrusion cam khwb cia zaj duab xis, multilayer co-extrusion lamination, extrusion lamination, qhuav lamination thiab thermal forming.
Ntawm lawv, multilayer co-extrusion --qhov twg EVOH ncaj qha ua ke nrog lwm cov ntaub ntawv los ua cov txheej txheem kev ua haujlwm tsis zoo - yog ib txoj hauv kev tseem ceeb rau kev tsim cov khoom ntim cov yeeb yaj kiab siab. Cov txheej txheem xaiv nyob ntawm qhov kev ntsuam xyuas dav dav ntawm cov txheej txheem oxygen barrier, zaj duab xis thickness, thermal sealing kev ua tau zoo, txhua yam muaj zog, pob tshab thiab daim ntawv thov ntawm qhov kawg ntim.
