Niaj hnub no, nrog kev txhim kho txuas ntxiv ntawm kev tshawb fawb thiab thev naus laus zis, tib neeg muaj kev xav tau ntau dua thiab siab dua rau kev ua neej zoo, thiab kev xav tau ntawm cov khoom siv lub neej tau nce, uas ua rau muaj kev ntxhov siab ntawm cov peev txheej thiab lub zog. Nyob rau tib lub sijhawm, cov teeb meem ib puag ncig tau dhau los ua qhov tseem ceeb, hauv kev lag luam ntim khoom, cov ntaub ntawv ntim khoom ntim tau yooj yim tau ua tiav sai, tab sis kuj tiv taus cov teeb meem loj. Ntxiv nrog rau qhov yuav tsum tau ua rau cov khoom ntim khoom ntim yas kom tau raws li qhov yuav tsum tau ua ntawm ntim khoom zoo thiab kev ua haujlwm ntawm cov khoom sib txawv, nws tseem yuav tsum tau txuag cov peev txheej, txuag hluav taws xob, yooj yim rov siv dua tom qab siv lossis yooj yim rau degraded los ntawm ib puag ncig. Raws li qhov pib ntawm kev txhim kho thev naus laus zis, yog li cov ntaub ntawv ntim khoom siv yas hloov pauv tau tsim nyob rau hauv cov kev taw qhia ntawm kev ua haujlwm siab, ntau txoj haujlwm, kev tiv thaiv ib puag ncig thiab nthuav dav daim ntawv thov.
Niaj hnub no, kev ua haujlwm siab thiab ntau yam khoom siv yas ntim khoom siv tau los ua cov khoom ntim kub. Thiab qee cov khoom tau muab tso rau hauv kev tsim khoom. Xws li cov ntaub ntawv muaj xws li cov ntaub ntawv ntim cov yas ntim tau yooj yim xws li cov teeb meem siab, xaiv permeability, kub tsis kam, resealing thiab yooj yim qhib. Ntawm lawv, txoj kev loj hlob ntawm cov teeb meem siab, xaiv permeability thiab cov ntaub ntawv ntim cov khoom kub resistant yog sai dua.
1. High barrier yas ntim cov ntaub ntawv
High barrier yas ntim cov ntaub ntawv yog tsim nrog txoj kev loj hlob sai ntawm kev lag luam khoom noj khoom haus, thiab cov khoom siv ntim cov khoom ntim siab tau tsim thiab dav siv hauv kev lag luam ntim khoom, tshwj xeeb tshaj yog nyob rau hauv kev lag luam ntim khoom noj. Nws tau ua lub luag haujlwm hauv kev khaws cov zaub mov zoo, kev khaws cia tshiab, kev txuag hluav taws xob thiab kev txuag lub neej ntev, thiab ntau yam khoom noj txuag technologies, xws li lub tshuab nqus tsev ntim, roj ntim ntim, ntim deoxidizer ntim, ntim zaub mov qhuav, ntim khoom tsis muaj menyuam, ua noj ua haus. ntim, kua kub filling ntim thiab lwm yam. Ntau yam ntawm cov khoom ntim yas siv hauv cov tshuab ntim khoom no xav tau ntau yam khoom, tab sis qhov tseem ceeb yog tias lawv yuav tsum muaj cov khoom thaiv zoo. Cov hauv qab no yog ntau hom kev ntim khoom yooj yim ntawm cov ntaub ntawv thaiv kom ua tau qee qhov kev taw qhia.
Cov ntaub ntawv uas muaj ntau tshaj qhov barrier zaj duab xis yog raws li nram no:
(1) PVDC cov ntaub ntawv (polyvinylidene chloride)
Polyvinylidene chloride (PVDC) resin, feem ntau siv los ua cov khoom sib xyaw lossis cov khoom siv monomer thiab co-extruded zaj duab xis, yog cov khoom siv ntim khoom siv siab tshaj plaws. Ntawm lawv, kev siv PVDC coated films yog tshwj xeeb tshaj yog loj. PVDC coated zaj duab xis yog siv polypropylene (OPP), polyethylene terephthalate (PET) ua cov khoom siv hauv paus. Vim lub siab softening kub ntawm ntshiab PVDC, ze rau nws decomposition kub, thiab tsis zoo compatibility nrog cov yas yas, cua sov molding yog ib qho nyuaj thiab nyuaj rau thov ncaj qha. Cov yeeb yaj kiab PVDC feem ntau yog cov copolymer ntawm vinylidene chloride (VDC) thiab vinyl chloride (VC), thiab cov yeeb yaj kiab uas muaj cov khoom thaiv tshwj xeeb zoo ua los ntawm copolymerization nrog methacrylate (MA).
(2) Cov ntaub ntawv ntim nylon
Nylon ntim cov ntaub ntawv ua ntej - ncaj siv "nylon 6". Tab sis huab cua nruj ntawm "nylon 6" tsis zoo tagnrho. Ib hom nylon (MXD6) ua los ntawm kev sib xyaw ua ke ntawm m-dimethylamine thiab adipic acid yog 10 zaug airtight ntau dua li "nylon 6", thiab muaj qhov pom tseeb thiab qhov tsis zoo. Nws yog tsuas yog siv rau siab barrier ntim zaj duab xis rau zaub mov saj zawg zog ntim nrog siab barrier yuav tsum. Nws kuj tau pom zoo los ntawm FDA rau kev nyiam huv ntawm zaub mov. Nws tus yam ntxwv raws li ib tug zaj duab xis ****** yog hais tias lub barrier vaj tse tsis txo nrog qhov nce ntawm cov av noo. Hauv Tebchaws Europe, vim muaj teeb meem tiv thaiv ib puag ncig zoo, ua lwm txoj hauv kev rau PVDC cov yeeb yaj kiab, kev siv MXD6 nylon yog qhov loj heev.
Tsis tas li ntawd, MXD6 nylon thiab EVOH cov yeeb yaj kiab sib xyaw nrog ob-txoj kev txuas ntxiv, raws li hom kev tiv thaiv siab nylon zaj duab xis. Cov txheej txheem sib xyaw suav nrog ntau txheej sib xyaw, thiab txoj kev sib xyaw MXD6 nylon thiab EVOH kuj tseem siv.
(3) EVOH cov ntaub ntawv
EVOH - yog cov khoom siv dav siv ntau tshaj plaws.
Cov yeeb yaj kiab hom ntawm cov khoom siv no ntxiv rau hom tsis muaj tensile, muaj ob hom tensile hom, aluminium evaporation hom, nplaum txheej hom thiab lwm yam. Bidirectional stretch type kuj muaj cov khoom siv hluav taws xob tiv thaiv rau aseptic ntim. EVOH resin thiab polyolefin, nylon thiab lwm yam resins co-extruded zaj duab xis yog tsuas yog siv rau cov tsiaj txhu ntim khoom.
(4) inorganic oxide coated zaj duab xis
PVDC, uas yog dav siv los ua cov khoom ntim khoom ntim siab, muaj lub siab nyiam hloov los ntawm lwm cov ntaub ntawv ntim vim yog ib puag ncig muaj kuab paug los ntawm HCl tsim nyob rau hauv combustion ntawm nws cov pov tseg. Piv txwv li, lub npe hu ua coated zaj duab xis uas tsim tom qab txheej ntawm SiOX (silicon oxide) ntawm cov yeeb yaj kiab ntawm lwm cov substrates tau raug them nyiaj mloog mus rau, ntxiv rau cov silicon oxide txheej, kuj tseem muaj alumina evaporation films. Nws cov airtight kev ua tau zoo yog tib yam li ntawm silicon oxide txheej tau los ntawm tib txoj kev.
2. Cov yas qhwv tshiab
Vim qhov tshwj xeeb ntawm kev ua liaj ua teb, kev thauj mus los ntau thiab ntau dua, kev thauj mus los ntev ntawm cov txiv hmab txiv ntoo thiab zaub, thiab tib neeg cov kev xav tau los txhim kho lub neej zoo, qhov kev thov rau cov txiv hmab txiv ntoo tshiab thiab zaub khaws cia thiab txee lub neej ncua ntawm cov yeeb yaj kiab tshiab yog loj hlob. Ib qho tshwj xeeb ntawm cov txiv hmab txiv ntoo thiab zaub tshiab yog tias lawv tseem ua pa tom qab xaiv, thiab ua pa nrog cov metabolism, dej evaporation thiab ethylene ntau lawm, uas ntxiv cov txiv hmab txiv ntoo thiab zaub mus txog thaum lawv tuag. Nyob rau tib lub sijhawm, ib puag ncig no kuj ua rau nws yooj yim rau cov kab mob kom loj hlob thiab loj hlob sai, ua rau cov txiv hmab txiv ntoo thiab zaub kom rot sai. Txhawm rau txuas ntxiv kev khaws cia thiab txee lub neej ntawm cov txiv hmab txiv ntoo thiab zaub, kev tshawb fawb thiab kev tsim cov yeeb yaj kiab tshiab uas muaj ntau yam kev khaws cia tau ntxiv dag zog rau hauv tsev thiab txawv teb chaws.
Kev ntim khoom noj tshiab tseem ceeb heev rau qhov permeability ntawm cov pa roj, thiab xaiv cov khoom yas sib txawv. Nrog rau txoj kev loj hlob ntawm kev lag luam khoom noj khoom haus thiab kev kawm ntawm cov khoom siv science, raws li cov khoom ntim khoom noj tsis yog tsuas yog yuav tsum tau muaj roj ntau, tab sis ntxiv yuav tsum tau txhim kho txoj haujlwm ntawm kev xaiv permeability, uas yog, raws li cov kev xav tau ntawm cov khoom ntim, tsuas yog tso cai rau qhov xav tau (lossis tsis xav tau) cov roj molecules dhau los, txhawm rau tsim kom muaj kev tswj hwm ib puag ncig zoo. Qhov kev xaiv ntawm cov ntaub ntawv ntim permeable no tau nkag mus rau qhov ua tau zoo hauv cov teb chaws txawv teb chaws, feem ntau yog qhov sib ntxiv ntawm cov khoom siv roj yaj hauv cov yeeb yaj kiab, ntxiv cov ntxeem tau zeolite lossis silicon oxide hmoov zaj duab xis, siv gamma ray irradiation los hloov cov khoom ntawm zaj duab xis. thiab kev siv diffusion coefficient ntawm cov ntsiab lus dej, kev qhia txog cov yeeb yaj kiab uas muaj cov pab pawg hydroxyl thiab amide pawg. Tsis tas li ntawd, qee cov tshuaj tua kab mob thiab cov tshuaj tua kab mob tuaj yeem muab ntxiv rau hauv zaj duab xis los tiv thaiv kev loj hlob thiab kev loj hlob ntawm cov kab mob thiab pwm. Lub tshuab muaj lub pob tshab zaj duab xis, nruab nrab ntawm cov khoom uas muaj siab osmotic siab raug ntsia. Kev siv cov hnab yas no los ntim cov txiv hmab txiv ntoo thiab zaub tuaj yeem maj mam nqus cov dej oozing los ntawm cov txiv hmab txiv ntoo thiab zaub, thiaj li ua tiav lub hom phiaj ntawm kev khaws cia.
