Pofuna kuwonjezera moyo wa alumali wa zinthu monga chakudya ndi mankhwala, ambirizonyamula katundupazakudya ndi mankhwala masiku ano amagwiritsa ntchito mafilimu ophatikizika amitundu yambiri. Pakalipano, pali zigawo ziwiri, zitatu, zisanu, zisanu ndi ziwiri, zisanu ndi zinayi, ngakhale khumi ndi chimodzi za zipangizo zopangira ma CD. Kanema wosanjikiza kambiri ndi filimu yopyapyala yomwe imapangidwa ndikutulutsa zida zingapo zamapulasitiki m'njira zingapo nthawi imodzi kuchokera pakutsegula kwa nkhungu imodzi, yomwe imatha kupititsa patsogolo ubwino wa zinthu zosiyanasiyana.
Multi layerphukusi filimu mpukutuamapangidwa makamaka ndi zosakaniza za polyolefin. Pakalipano, zomwe zimagwiritsidwa ntchito nthawi zambiri zikuphatikizapo: polyethylene / polyethylene, polyethylene ethylene vinyl acetate copolymer / polypropylene, LDPE / zomatira / EVOH / zomatira / LDPE, LDPE / zomatira / EVH / EVOH / EVOH / zomatira / LDPE. Makulidwe a wosanjikiza aliyense akhoza kusinthidwa kudzera muukadaulo wa extrusion. Mwa kusintha makulidwe a chotchinga chotchinga ndikugwiritsa ntchito zinthu zosiyanasiyana zotchinga, mafilimu osinthika okhala ndi zopinga zosiyanasiyana amatha kupangidwa. Zida zosindikizira kutentha zimatha kusinthidwanso ndikusinthidwa kuti zikwaniritse zosowa zamapaketi osiyanasiyana. Mipikisano wosanjikiza ndi multifunctional ma CD kaphatikizidwe ndi njira yaikulu kwa chitukuko cha ma CD zipangizo filimu mtsogolo.
Mipikisano wosanjikiza ma CD filimu gulu gulu
Mafilimu ophatikizika ambiri osanjikiza, mosasamala kuchuluka kwa zigawo, nthawi zambiri amagawidwa kukhala wosanjikiza, wosanjikiza, ndi zomatira kutengera ntchito ya filimuyo.
Mulingo woyambira
Nthawi zambiri, zigawo zamkati ndi zakunja zamakanema ophatikizika ziyenera kukhala ndi mawonekedwe abwino komanso amakina, kupanga magwiridwe antchito, ndikusindikiza kutentha. Iyeneranso kukhala ndi ntchito yabwino yosindikizira kutentha ndi kuwotcherera kotentha, komwe kumakhala kotsika mtengo, kukhala ndi chithandizo chabwino ndi kusungirako pagawo logwira ntchito, ndikukhala ndi gawo lalikulu kwambiri mufilimu yophatikizika, kutsimikizira kukhazikika kwa filimu yophatikizika. . Zida zoyambira ndi PE, PP, EVA, PET, ndi PS.
Ntchito wosanjikiza
Ntchito wosanjikiza wafilimu yopangira chakudyanthawi zambiri zimakhala zotchinga, nthawi zambiri zimakhala pakati pa filimu yamitundu yambiri, makamaka pogwiritsa ntchito zotchinga zotchinga monga EVOH, PVDC, PVA, PA, PET, ndi zina zotero. Pakati pawo, zinthu zomwe zimagwiritsidwa ntchito kwambiri ndi EVOH ndi PVDC. , ndi PA wamba ndi PET ali ndi katundu chotchinga ofanana, za zipangizo sing'anga chotchinga.
EVOH (ethylene vinyl alcohol copolymer)
Ethylene vinilu mowa copolymer ndi zinthu polima kuti amaphatikiza processability wa ethylene ma polima ndi mpweya chotchinga katundu wa ethylene mowa ma polima. Imawonekera kwambiri ndipo ili ndi gloss yabwino. EVOH ili ndi zotchinga zabwino kwambiri zamagasi ndi mafuta, zokhala ndi mphamvu zamakina, kukhazikika, kukana kuvala, kukana kuzizira, kulimba kwapamwamba, komanso kukonza bwino ntchito. Ntchito yotchinga ya EVOH imadalira zomwe zili ndi ethylene. Zomwe ethylene zimachulukira, ntchito yotchinga mpweya imachepa, koma kukana chinyezi kumawonjezeka, ndipo ndikosavuta kukonza.
Zogulitsa zomwe zaphatikizidwa ndi zida za EVOH zimaphatikizapo zokometsera, mkaka, nyama, tchizi, ndi zina.
PVDC (polyvinylidene kloride)
Polyvinylidene chloride (PVDC) ndi polima wa vinylidene kolorayidi (1,1-dichlorethylene). Kutentha kwa kutentha kwa homopolymer PVDC ndikotsika kuposa kusungunuka kwake, zomwe zimapangitsa kuti zikhale zovuta kusungunuka. Chifukwa chake, monga ma CD, PVDC ndi copolymer ya vinylidene chloride ndi vinyl chloride, yomwe imakhala ndi mpweya wabwino, kukana dzimbiri, kusindikiza bwino komanso kusindikiza kutentha.
M'masiku oyambilira, idagwiritsidwa ntchito kwambiri popanga zida zankhondo. M'zaka za m'ma 1950, idayamba kugwiritsidwa ntchito ngati filimu yosungira chakudya, makamaka ndi chitukuko chofulumira cha luso lamakono lazosungiramo zinthu komanso moyo wamakono wa anthu, kusungirako kuzizira komanso kusunga, kusintha kwa microwave cookware, ndi kufalikira kwa zakudya ndi zakudya. moyo wa alumali wamankhwala wapangitsa kugwiritsa ntchito PVDC kukhala kodziwika kwambiri. PVDC ikhoza kupangidwa kukhala mafilimu owonda kwambiri, kuchepetsa kuchuluka kwa zida zopangira ndi kuyika ndalama. Idakali yotchuka lerolino
Zomatira wosanjikiza
Chifukwa cha kusalumikizana bwino pakati pa ma resins oyambira ndi utomoni wogwirira ntchito, ndikofunikira kuyika zomatira pakati pa zigawo ziwirizi kuti zikhale ngati guluu ndikupanga filimu yophatikizika. Zomatira zimagwiritsa ntchito utomoni womatira, womwe umagwiritsidwa ntchito kwambiri ndi polyolefin wolumikizidwa ndi maleic anhydride ndi ethylene vinyl acetate copolymer (EVA).
Maleic anhydride kumtengowo polyolefins
Maleic anhydride kumtengowo polyolefin amapangidwa ndi kulumikiza maleic anhydride pa polyethylene kudzera reactive extrusion, kuyambitsa magulu polar pa unyolo non-polar. Ndi zomatira pakati pa zinthu za polar ndi zopanda polar ndipo zimagwiritsidwa ntchito kwambiri m'mafilimu ophatikizika a polyolefins monga polypropylene ndi nayiloni.
EVA (ethylene vinyl acetate copolymer)
EVA imabweretsa vinyl acetate monomer mu unyolo wa maselo, kuchepetsa kristalo wa polyethylene ndikuwongolera kusungunuka ndi kusindikiza kwamafuta kwamafuta. Zomwe zili mu ethylene ndi vinyl acetate muzinthu zimabweretsa ntchito zosiyanasiyana:
① Zogulitsa zazikulu za EVA zomwe zili ndi ethylene acetate pansi pa 5% ndi zomatira, makanema, mawaya ndi zingwe, ndi zina;
② Zogulitsa zazikulu za EVA zokhala ndi vinyl acetate zili 5% ~ 10% ndi mafilimu zotanuka, ndi zina;
③ Zinthu zazikulu za EVA zokhala ndi vinyl acetate zili 20% ~ 28% ndi zomatira zotentha zosungunuka ndi zokutira;
④ Zogulitsa zazikulu za EVA zokhala ndi vinyl acetate zomwe zili 5% ~ 45% ndi makanema (kuphatikiza makanema aulimi) ndi mapepala, zinthu zopangidwa ndi jekeseni, thovu, ndi zina zambiri.
Nthawi yotumiza: Jun-12-2024