Zida zopangira zotchinga zapamwamba zapangidwa mwachangu ndipo zimagwiritsidwa ntchito kwambiri m'mafakitale onyamula katundu makamaka m'makampani opanga zakudya.Zimagwira ntchito pakusunga zakudya zabwino, kusungirako mwatsopano, kusunga kukoma komanso kukulitsa moyo wa alumali.Pali matekinoloje osiyanasiyana osungira chakudya, monga kuyika vacuum, kuyika gasi, kusindikiza ma deoxidizer, kuyanika chakudya, kuyika kwa aseptic, kuyika kuphika, kudzaza mafuta amadzimadzi ndi zina zotero.M'matekinoloje ambiri oyika izi, zida zabwino zotchingira pulasitiki ziyenera kugwiritsidwa ntchito.
Zinthu zodziwika bwino kwambiri zamakanema apamwamba kwambiri ndi awa:
1. PVDC Zida (Polyvinylidene Chloride)
Polyvinylidene chloride (PVDC) utomoni, nthawi zambiri ntchito ngati gulu la zinthu kapena monomer zakuthupi ndi co-extruded filimu, ndi ambiri ntchito mkulu chotchinga ma CD zipangizo.Kugwiritsa ntchito filimu yokutira ya PVDC ndikokulirapo.Kanema wokutira wa PVDC ndikugwiritsa ntchito polypropylene (OPP), polyethylene terephthalate (PET) ngati maziko.Chifukwa cha kutentha kwapamwamba kwambiri kwa PVDC koyera, kusungunuka kwa PVDC kuli pafupi ndi kutentha kwake, ndipo kusakanikirana ndi plasticizer kumakhala kovutirapo, kuumba kotentha kumakhala kovuta komanso kovuta kuti kugwiritsidwe ntchito mwachindunji.Kugwiritsa ntchito kwenikweni filimu ya PVDC nthawi zambiri ndi copolymer ya vinylidene chloride (VDC) ndi vinyl chloride (VC), komanso acrylic methylene (MA) copolymerization yopangidwa ndi filimu yabwino kwambiri yotchinga.
2. Nayiloni Packaging Zida
Zida zopangira nayiloni zisanachitike - gwiritsani ntchito molunjika "nayiloni 6".Koma "nylon 6" mpweya wothina siwoyenera.Nayiloni (MXD6) yopangidwa kuchokera ku polycondensation ya m-dimethylamine ndi adipic acid imakhala ndi mpweya wokwanira ka 10 kuposa "nayiloni 6", komanso imakhala yowonekera bwino komanso kukana kubowola.Makamaka ntchito mkulu chotchinga ma CD filimu kwa mkulu chotchinga zofunika chakudya kusintha ma CD.Imavomerezedwanso ndi FDA paukhondo wazakudya.Chinthu chake chachikulu monga filimu ndikuti chotchinga sichimagwa ndi kukwera kwa chinyezi.Ku Europe, nayiloni ya MXD6 imagwiritsidwa ntchito kwambiri ngati m'malo mwa makanema a PVDC chifukwa cha zovuta zodziwika bwino zoteteza chilengedwe.
3. Zida za EVOH
EVOH ndizomwe zimagwiritsidwa ntchito kwambiri zotchinga zapamwamba.
Mitundu ya filimuyi yazinthuzi kuwonjezera pa mtundu wosasunthika, pali mitundu iwiri yokhazikika, mtundu wa aluminiyamu wa evaporation, mtundu wa zomatira ndi zina zotero.Njira ziwiri zotambasulira ndi kutentha - zosagwirizana ndi ma CD a aseptic.
4. Kanema Wokutidwa ndi Oxide wa Inorganic
PVDC, yomwe imagwiritsidwa ntchito kwambiri ngati chotchinga chotchinga chachikulu, imakhala ndi chizolowezi chosinthidwa ndi zida zina zopakira chifukwa zinyalala zake zimatulutsa HCl zikawotchedwa.Mwachitsanzo, otchedwa filimu wokutira wopangidwa pambuyo ❖ kuyanika kwa SiOX (silicon oxide) pa filimu ya magawo ena apatsidwa chidwi, kuwonjezera pa filimu yokutira silicon oxide, pali alumina evaporation film.Kuchita kwa mpweya wopaka mpweya kumafanana ndi kutsekemera kwa silicon oxide komwe kumapezeka mwa njira yomweyo.
M'zaka zaposachedwa, ma multilayer composite, blending, copolymerization ndi evaporation matekinoloje apangidwa mofulumira.Zida zopangira zotchinga zazikulu monga vinyl vinyl glycol copolymer (EVOH), polyvinylidene chloride (PVDC), polyamide (PA), polyethylene terephthalate (PET) multilayer composite materials ndi silicon oxide compound evaporation film apangidwanso, makamaka zinthu zotsatirazi ndizowonjezera. zokopa maso: MXD6 polyamide ma CD zipangizo;Polyethylene glycol naphthalate (PEN);Silicon oxide evaporation film, etc.
Nthawi yotumiza: Mar-09-2023