Txhawm rau txuas ntxiv lub txee lub neej ntawm cov khoom xws li zaub mov thiab tshuaj, ntaucov khoom ntimrau cov khoom noj thiab tshuaj niaj hnub no siv ntau txheej ntim cov yeeb yaj kiab sib xyaw. Tam sim no, muaj ob, peb, tsib, xya, cuaj, thiab kaum ib txheej ntawm cov khoom ntim khoom sib xyaw. Multi txheej ntim zaj duab xis yog ib zaj duab xis nyias uas tsim los ntawm extruding ntau yam yas raw cov ntaub ntawv rau hauv ntau txoj kev ib txhij los ntawm ib tug pwm qhib, uas muaj peev xwm leverage qhov zoo ntawm cov khoom sib txawv.
Ntau txheejntim zaj duab xis yobFeem ntau yog tsim los ntawm polyolefin ua ke. Tam sim no, cov qauv siv feem ntau suav nrog: polyethylene / polyethylene, polyethylene ethylene vinyl acetate copolymer / polypropylene, LDPE / nplaum txheej / EVOH / nplaum txheej / LDPE, LDPE / nplaum txheej / EVH / EVOH / EVOH / PE. Lub thickness ntawm txhua txheej tuaj yeem hloov kho los ntawm kev siv tshuab extrusion. Los ntawm kev kho qhov tuab ntawm txheej txheej thiab siv ntau yam khoom thaiv, cov yeeb yaj kiab hloov tau yooj yim nrog cov khoom thaiv sib txawv tuaj yeem tsim. Lub tshav kub sealing txheej cov ntaub ntawv tseem tuaj yeem hloov pauv thiab hloov kho kom tau raws li qhov xav tau ntawm cov ntim sib txawv. Cov txheej txheem ntau thiab ntau lub ntim ntim khoom sib xyaw ua ke yog cov kev taw qhia tseem ceeb rau kev tsim cov khoom ntim zaj duab xis rau yav tom ntej.
Multi-layer packaging composite film structure
Ntau txheej ntim cov zaj duab xis, tsis hais txog cov txheej txheem ntau npaum li cas, feem ntau muab faib ua txheej txheej, txheej txheej, thiab txheej nplaum raws li kev ua haujlwm ntawm txhua txheej ntawm zaj duab xis.
Qib theem pib
Feem ntau, cov khaubncaws sab nraud povtseg sab hauv thiab sab nrauv ntawm cov yeeb yaj kiab sib xyaw yuav tsum muaj lub cev zoo thiab cov khoom siv kho tshuab, tsim kev ua haujlwm, thiab txheej txheej kub sealing. Nws kuj yuav tsum muaj kev ua haujlwm zoo thaum tshav kub kub sealing thiab kub vuam kev ua tau zoo, uas yog tus nqi qis, muaj kev txhawb nqa zoo thiab kev tuav pov hwm zoo ntawm cov txheej txheem ua haujlwm, thiab muaj qhov sib npaug siab tshaj plaws hauv cov yeeb yaj kiab sib xyaw, txiav txim siab tag nrho cov rigidity ntawm cov yeeb yaj kiab sib xyaw. . Cov ntaub ntawv hauv paus yog PE, PP, EVA, PET, thiab PS.
Cov txheej txheem ua haujlwm
Functional txheej ntawmzaub mov ntim zaj duab xisfeem ntau yog txheej txheej txheej, feem ntau yog nyob rau hauv nruab nrab ntawm ntau txheej txheej zaj duab xis, feem ntau yog siv barrier resins xws li EVOH, PVDC, PVA, PA, tsiaj, thiab lwm yam. , thiab hom PA thiab PET muaj cov khoom thaiv zoo sib xws, yog cov khoom siv nruab nrab barrier.
EVOH (ethylene vinyl cawv copolymer)
Ethylene vinyl cawv copolymer yog cov khoom siv polymer uas sib txuas cov txheej txheem ntawm ethylene polymers thiab cov roj teeb meem ntawm ethylene cawv polymers. Nws yog pob tshab heev thiab muaj gloss zoo. EVOH muaj cov khoom thaiv zoo heev rau cov roj thiab cov roj, nrog rau cov khoom siv zoo heev, elasticity, hnav tsis kam, txias tsis kam, thiab lub zog nto, thiab kev ua haujlwm zoo heev. Qhov barrier kev ua tau zoo ntawm EVOH nyob ntawm cov ntsiab lus ethylene. Thaum cov ntsiab lus ethylene nce, cov pa roj barrier kev ua tau zoo txo qis, tab sis kev ua haujlwm ntawm cov dej noo nce, thiab nws yooj yim rau kev ua haujlwm.
Cov khoom ntim nrog EVOH cov ntaub ntawv muaj xws li seasonings, khoom noj siv mis, khoom noj nqaij, cheese khoom, thiab lwm yam.
PVDC (polyvinylidene chloride)
Polyvinylidene chloride (PVDC) yog ib qho polymer ntawm vinylidene chloride (1,1-dichloroethylene). Lub decomposition kub ntawm homopolymer PVDC yog qis dua nws melting point, ua rau nws nyuaj rau yaj. Yog li ntawd, raws li cov khoom ntim, PVDC yog copolymer ntawm vinylidene chloride thiab vinyl chloride, uas muaj airtightness zoo, corrosion kuj, zoo printing thiab kub sealing zog.
Thaum ntxov, nws yog siv los ua tub rog ntim khoom. Nyob rau xyoo 1950, nws tau pib siv los ua cov yeeb yaj kiab khaws cia zaub mov, tshwj xeeb tshaj yog nrog kev txhim kho sai ntawm cov khoom ntim niaj hnub thiab cov neeg niaj hnub lub neej, kev ceev ceev khov thiab khaws cia ntim, kev hloov pauv ntawm microwave cookware, thiab txuas ntxiv ntawm cov zaub mov thiab. Cov tshuaj txee lub neej tau ua rau daim ntawv thov ntawm PVDC nrov dua. PVDC tuaj yeem ua rau hauv cov yeeb yaj kiab ultra-nyias, txo cov khoom siv raw thiab cov nqi ntim khoom. Nws tseem nrov niaj hnub no
Adhesive txheej
Vim yog qhov tsis zoo ntawm qee qhov hauv paus resins thiab cov txheej txheem ua haujlwm, nws yog ib qho tsim nyog yuav tsum tso qee cov nplaum nplaum ntawm ob txheej no los ua cov kua nplaum thiab tsim cov yeeb yaj kiab sib xyaw ua ke. Cov nplaum nplaum siv cov nplaum nplaum, feem ntau siv xws li polyolefin grafted nrog maleic anhydride thiab ethylene vinyl acetate copolymer (EVA).
Maleic anhydride grafted polyolefins
Maleic anhydride grafted polyolefin yog tsim los ntawm grafting maleic anhydride mus rau polyethylene los ntawm reactive extrusion, qhia polar side pawg ntawm cov tsis-polar chains. Nws yog ib qho nplaum ntawm polar thiab non-polar cov ntaub ntawv thiab feem ntau yog siv rau hauv cov yeeb yaj kiab ntawm polyolefins xws li polypropylene thiab nylon.
EVA (ethylene vinyl acetate copolymer)
EVA qhia txog vinyl acetate monomer rau hauv cov saw hlau molecular, txo cov crystallinity ntawm polyethylene thiab txhim kho cov solubility thiab thermal sealing kev ua tau zoo ntawm fillers. Cov ntsiab lus sib txawv ntawm ethylene thiab vinyl acetate hauv cov ntaub ntawv ua rau muaj kev siv sib txawv:
① Cov khoom tseem ceeb ntawm EVA nrog ethylene acetate cov ntsiab lus hauv qab 5% yog cov nplaum, cov yeeb yaj kiab, cov xov hlau thiab cov cables, thiab lwm yam;
② Cov khoom tseem ceeb ntawm EVA nrog vinyl acetate cov ntsiab lus ntawm 5% ~ 10% yog cov yeeb yaj kiab elastic, thiab lwm yam;
③ Cov khoom tseem ceeb ntawm EVA nrog vinyl acetate cov ntsiab lus ntawm 20% ~ 28% yog kub yaj nplaum nplaum thiab txheej khoom;
④ Cov khoom tseem ceeb ntawm EVA nrog vinyl acetate cov ntsiab lus ntawm 5% ~ 45% yog cov yeeb yaj kiab (nrog rau cov yeeb yaj kiab ua liaj ua teb) thiab cov ntawv txheeb, cov khoom siv tshuaj molded, cov khoom ua npuas dej, thiab lwm yam.
Post lub sij hawm: Jun-12-2024