Njengoba ubisi yisiphuzo esisha, izidingo zokuhlanzeka, amagciwane, izinga lokushisa, njll ziqinile kakhulu.Ngakho-ke, kunezidingo ezikhethekile zokunyathelisa izikhwama zokupakisha, okwenza ukuphrinta kwefilimu yokupakisha yobisi kuhluke kwezinye izici zobuchwepheshe zokunyathelisa.Ukuze kukhethwe ifilimu yokupakisha yobisi, kufanele ihlangabezane nezidingo zokupakisha, ukuphrinta, ukucubungula, ukugcinwa kanye nokuthutha kanye nokuhlanzeka.Njengamanje, izinto zefilimu ezisetshenziswa kakhulu ikakhulukazi ifilimu ye-polyethylene (PE) ekhishwe ngokuhlanganyela, okuyi-ncibilikisa inhlaka ye-polyethylene kanye nokubunjwa kokushaywa.
Izinhlobo zamafilimu okufaka ubisi:
Ngokwesakhiwo sayo sesendlalelo, ingahlukaniswa ngokuyisisekelo ibe izinhlobo ezintathu.
1. Ifilimu yokupakisha elula
Ngokuvamile ifilimu yongqimba olulodwa, ekhiqizwa ngokwengeza ingxenye ethile ye-masterbatch emhlophe ezintweni ezihlukahlukene ze-polyethylene futhi ekhiqizwa imishini yefilimu ephephethwayo.Le filimu yokupakisha inesakhiwo esingavimbeli futhi igcwala ukushisa nge-pasteurization (85°C/30min), enempilo yeshelufu emfushane (cishe izinsuku ezi-3).
2. Ifilimu yokupakisha ye-co-extrusion emnyama nemhlophe enesakhiwo sezendlalelo ezintathu
Ifilimu eyinhlanganisela esezingeni eliphezulu eyenziwe nge-LDPE, LLDPE, EVOH, MLLDPE namanye ama-resin, akhishwe ngokuhlanganyela futhi aphephethwa ngama-masterbatches amnyama namhlophe.I-masterbatch emnyama eyengezwe kungqimba yangaphakathi ye-heat-seal idlala indima yokuvimbela ukukhanya.Le filimu yokupakisha isebenzisa izinga lokushisa eliphakeme kakhulu lokuvala inzalo ngokushesha kanye nezindlela zokuvala inzalo nge-hydrogen peroxide, futhi impilo yeshalofu ekamelweni lokushisa ingafinyelela izinsuku ezingaba ngu-30.
3. Ifilimu yokupakisha ye-co-extrusion emnyama nemhlophe enesakhiwo sezendlalelo ezinhlanu
Isendlalelo sokuvimbela esimaphakathi (esakhiwa ama-resin anesithiyo esiphezulu njenge-EVA ne-EVAL) siyengezwa uma ifilimu ishaywa.Ngakho-ke, le filimu yokupakisha iyifilimu yokupakisha ye-aseptic ene-barrier ephezulu eneshelufu ende futhi ingagcinwa ekamelweni lokushisa cishe izinsuku ezingu-90.Amafilimu okupakisha anezendlalelo ezintathu kanye nezingqimba eziningi ezimnyama nezimhlophe ezihlanganisiwe zinezindawo ezinhle kakhulu zokuvala ukushisa, ukumelana komoya-mpilo nokukhanya, futhi anezinzuzo zenani eliphansi, izinto zokuhamba ezikahle, indawo yokugcina encane, nokusebenza okuqinile.
Izidingo zokusebenza zefilimu ye-polyethylene yemikhiqizo yobisi:
Ukuze kuhlangatshezwane nezidingo zokugcwaliswa kobisi nokunyathelisa, izici ezilandelayo zidingeka ikakhulukazi kwifilimu ye-polyethylene.
1. Ubushelelezi
Indawo yangaphakathi nangaphandle yefilimu kufanele ibe nokushelela okuhle ukuze kuqinisekiswe ukuthi ingagcwaliswa kahle emshinini wokugcwalisa othomathikhi wesivinini esikhulu.Ngakho-ke, i-coefficient eguquguqukayo nemile yokungqubuzana kwendawo yefilimu kufanele ibe phansi uma kuqhathaniswa, ngokuvamile idinga u-0.2 kuya ku-0.4 Ubushelelezi befilimu Ngemva kokwakhiwa kwefilimu, i-ejenti eshelelayo isuka kufilimu iye phezulu futhi inqwabelane ibe ungqimba oluncane olufanayo. , okunganciphisa kakhulu i-coefficient ye-friction yefilimu futhi yenze ifilimu ibe nokushelela okuhle.Umphumela.
2. Amandla okuqina
Njengoba ifilimu yepulasitiki ingaphansi kokucindezeleka komshini ovela emshinini wokugcwalisa othomathikhi ngesikhathi sokugcwalisa, kuyadingeka ukuthi ifilimu kufanele ibe namandla anele okuqina ukuze ivimbele ukuthi ingakhishwa ngaphansi kokucindezeleka komshini wokugcwalisa othomathikhi.Enqubweni yokushaywa kwefilimu, ukusetshenziswa kwezinhlayiya ze-LDPE noma ze-HDPE ezinenkomba encibilikisiwe ephansi kunenzuzo kakhulu ukuthuthukisa amandla aqinile amafilimu e-polyethylene.
3. Ingcindezi yokumanzisa ebusweni
Ukuze wenze u-inki wokunyathelisa usakazeke, umanzi futhi unamathele ngokushelelayo ebusweni befilimu yepulasitiki ye-polyethylene, kuyadingeka ukuthi ukungezwani okungaphezulu kwefilimu kufanele kufinyelele izinga elithile, futhi kuyadingeka ukuthembela ekwelashweni kwe-corona ukuze kuzuzwe ukungezwani kokumanzisa okuphezulu, ngaphandle kwalokho kuzothinta uyinki kwifilimu.Ukunamathela nokuqina kwendawo, ngaleyo ndlela kuthinte ikhwalithi yendaba ephrintiwe.Ngokuvamile kuyadingeka ukuthi ukungezwani kwendawo yefilimu ye-polyethylene kufanele ibe ngaphezu kwe-38dyne, futhi kungcono uma ingafinyelela ngaphezu kwe-40dyne.Njengoba i-polyethylene iyinto evamile ye-polymer engeyona i-polar, ayiqukethe amaqembu e-polar esakhiweni sayo samangqamuzana, futhi ine-crystallinity ephezulu, indawo ephansi yamandla mahhala, ukungabi namandla okuqinile, kanye nezakhiwo zamakhemikhali ezizinzile.Ngakho-ke, ukufaneleka kokuphrinta kwezinto zefilimu kuphakeme kakhulu.Kubi, ukunamathela kuyinki akulungile.
4. Ukuvalwa kokushisa
Into ekhathaza kakhulu mayelana nokupakishwa kwefilimu okuzenzakalelayo yinkinga yokuphuka kwesikhwama okubangelwa ukuvuza nokubekwa uphawu okungamanga.Ngakho-ke, ifilimu kufanele ibe nezakhiwo ezinhle zokwenza izikhwama zokuvala ukushisa, ukusebenza kahle kokuvala, kanye nohlu olubanzi lokuvala ukushisa, ukuze lusetshenziswe ekupakisheni.Lapho isivinini sishintsha, umphumela wokuvalwa kokushisa awuthinteki kakhulu, futhi i-MLDPE ivame ukusetshenziswa njengesendlalelo sokuvala ukushisa ukuze kuqinisekiswe ngokugcwele ukuzinza kwezimo zokuvala ukushisa kanye nokuvala ukushisa.Okusho ukuthi, kuyadingeka ukuqinisekisa ukuvalwa kokushisa futhi ukwazi ukusika kahle ukuze i-resin encibilikisiwe inganamatheli emmese.
Ukwengeza ingxenye ethile ye-LLDPE enqubweni yokufutha kwefilimu kungathuthukisa kakhulu izinga lokushisa eliphansi lokuvala ukusebenza kokuvalwa kokushisa kanye nokusebenza kokufakwa uphawu kokushisa kwefilimu, kodwa inani le-LLDPE elingeziwe akufanele libe likhulu kakhulu, ngaphandle kwalokho i-viscosity yefilimu ye-polyethylene izoba. iphezulu kakhulu, futhi inqubo yokuvala ukushisa ithambekele ekuhlulekeni kommese wokunamathela.Ngomklamo wesakhiwo sefilimu, ifilimu yokupakisha yesakhiwo esihambisanayo ingakhethwa ngokuvumelana nokuqukethwe okuhlukene kwephakheji kanye nempilo yayo yeshalofu.
Isikhathi sokuthumela: Jul-04-2022