Ukuze kunwetshwe impilo yeshalofu yezinto ezifana nokudla nezidakamizwa, eziningiizinto zokupakishangokudla nezidakamizwa namuhla sebenzisa amafilimu ayinhlanganisela yokupakisha anezingqimba eziningi. Njengamanje, kunezingqimba ezimbili, ezintathu, ezinhlanu, eziyisikhombisa, eziyisishiyagalolunye, ngisho neziyishumi nanye zezinto zokupakisha eziyinhlanganisela. Ifilimu yokupakisha yezingqimba eziningi ifilimu elincanyana elakhiwe ngokukhipha izinto zokusetshenziswa zepulasitiki eziningi eziteshini eziningi ngasikhathi sinye ukusuka ekuvulekeni kwesikhunta esisodwa, esingasebenzisa izinzuzo zezinto ezahlukahlukene.
Isendlalelo esiningiukupakisha ifilimu rollikakhulukazi akhiwe izinhlanganisela polyolefin. Njengamanje, izakhiwo ezivame ukusetshenziswa zihlanganisa: i-polyethylene / i-polyethylene, i-polyethylene ethylene vinyl acetate copolymer / polypropylene, i-LDPE / i-adhesive layer / EVOH / i-adhesive layer / LDPE, i-LDPE / i-adhesive layer / EVH / EVOH / EVOH / i-adhesive layer / LDPE. Ugqinsi lwesendlalelo ngasinye lungalungiswa ngobuchwepheshe be-extrusion. Ngokulungisa ukushuba kwesendlalelo sesithiyo nokusebenzisa izinto ezihlukahlukene zokuvimbela, amafilimu aguquguqukayo anezakhiwo ezihlukene zokuvimbela angaklanywa. Izinto zongqimba zokuvalwa kokushisa zingashintshwa ngokuguquguqukayo futhi zilungiswe ukuze zihlangabezane nezidingo zokupakishwa okuhlukile. Le nhlanganisela yokupakisha enezendlalelo eziningi kanye nemisebenzi eminingi iyisiqondiso esivamile sokuthuthukiswa kwezinto zefilimu zokupakisha esikhathini esizayo.
Isakhiwo sefilimu esiyinhlanganisela sokupakishwa kwezingqimba eziningi
Ifilimu eyinhlanganisela yokupakishwa kwezingqimba eziningi, kungakhathaliseki inani lezendlalelo, ngokuvamile ihlukaniswa ngokwesendlalelo sesisekelo, isendlalelo esisebenzayo, kanye nosendlalelo sokunamathisela ngokusekelwe emsebenzini wesendlalelo ngasinye sefilimu.
Izinga eliyisisekelo
Ngokuvamile, izendlalelo zangaphakathi nezangaphandle zamafilimu ayinhlanganisela kufanele zibe nezakhiwo ezinhle zomzimba nezomshini, zenze ukucubungula ukusebenza, kanye nosendlalelo sokuvala ukushisa. Kudingeka futhi kube nokusebenza okuhle kokuvala ukushisa nokusebenza kahle kokushisela, okuyizindleko eziphansi uma kuqhathaniswa, kube nemiphumela emihle yokwesekwa nokugcinwa kwesendlalelo esisebenzayo, futhi kube nengxenye ephezulu kakhulu kufilimu eyinhlanganisela, okunquma ukuqina kukonke kwefilimu eyinhlanganisela. . Izinto eziyisisekelo ziyi-PE, PP, EVA, PET, ne-PS.
Isendlalelo esisebenzayo
Isendlalelo sokusebenza seifilimu yokupakisha ukudlaikakhulukazi ungqimba oluvimbelayo, ngokuvamile luphakathi kwefilimu enezingqimba eziningi, ikakhulukazi kusetshenziswa ama-resin okuvimbela afana ne-EVOH, i-PVDC, i-PVA, i-PA, i-PET, njll. Phakathi kwazo, izinto ezivame ukusetshenziswa kakhulu zokuvimbela okuphezulu yi-EVOH ne-PVDC. , kanye ne-PA kanye ne-PET evamile kunezindawo zokuvimbela ezifanayo, eziyingxenye ye-medium barrier materials.
I-EVOH (i-ethylene vinyl alcohol copolymer)
I-Ethylene vinyl alcohol copolymer iyimpahla ye-polymer ehlanganisa ukucutshungulwa kwe-ethylene polymers kanye nezakhiwo zokuvimbela igesi zama-polymers e-ethylene alcohol. Ibonisa ngale futhi ine-gloss enhle. I-EVOH inezinto ezinhle kakhulu zokuthibela amagesi namafutha, enamandla amakhulu kakhulu emishini, ukunwebeka, ukumelana nokugqokwa, ukumelana nokubanda, namandla angaphezulu, kanye nokusebenza okuhle kakhulu kokucubungula. Ukusebenza kwesithiyo se-EVOH kuncike kokuqukethwe kwe-ethylene. Lapho okuqukethwe kwe-ethylene kukhula, ukusebenza kwesithiyo segesi kuyehla, kodwa ukusebenza kokumelana nomswakama kuyanda, futhi kulula ukusetshenzwa.
Imikhiqizo epakishwe ngezinto ze-EVOH ihlanganisa izinongo, imikhiqizo yobisi, imikhiqizo yenyama, imikhiqizo kashizi, njll.
I-PVDC (i-polyvinylidene chloride)
I-Polyvinylidene chloride (PVDC) iyi-polymer ye-vinylidene chloride (1,1-dichlorethylene). Izinga lokushisa lokubola le-homopolymer PVDC liphansi kunephuzu elincibilikayo, okwenza kube nzima ukuncibilika. Ngakho-ke, njengempahla yokupakisha, i-PVDC iyi-copolymer ye-vinylidene chloride ne-vinyl chloride, enomoya omuhle, ukumelana nokugqwala, ukuphrinta okuhle kanye nezakhiwo zokuvala ukushisa.
Ezinsukwini zokuqala, yayisetshenziselwa ikakhulukazi ukupakisha kwezempi. Ngawo-1950, yaqala ukusetshenziswa njengefilimu yokugcina ukudla, ikakhulukazi ngokuthuthuka okusheshayo kobuchwepheshe besimanje bokupakisha kanye nesivinini sokuphila kwabantu besimanje, ukupakishwa okuqandayo nokulondolozwa okusheshayo, ukuguqulwa kwezitsha zokupheka ze-microwave, kanye nokwandiswa kokudla kanye nokudla. impilo yeshelufu yezidakamizwa yenze ukusetshenziswa kwe-PVDC kwaziwa kakhulu. I-PVDC ingenziwa ibe amafilimu amancane kakhulu, ehlisa inani lezinto ezingavuthiwe nezindleko zokupakisha. Isadumile nanamuhla
Isendlalelo sokunamathela
Ngenxa yokungezwani okungekuhle phakathi kwamanye ama-resin ayisisekelo kanye nezinsika zezingqimba ezisebenzayo, kuyadingeka ukubeka izendlalelo ezithile zokunamathisela phakathi kwalezi zingqimba ezimbili ukuze zisebenze njengeglu futhi kwakhiwe ifilimu eyinhlanganisela ehlanganisiwe. Isendlalelo sokunamathisela sisebenzisa inhlaka enamathelayo, evame ukusetshenziswa ihlanganisa i-polyolefin exhunywe ne-maleic anhydride kanye ne-ethylene vinyl acetate copolymer (EVA).
Ama-anhydride e-Maleic axhunyelelwe i-polyolefin
I-polyolefin ye-maleic anhydride exhunyelelwe ikhiqizwa ngokuxhunyelelwa i-anhydride ye-maleic ku-polyethylene ngokusebenzisa i-extrusion esebenzayo, yethula amaqembu aseceleni kwe-polar kumaketango angewona ama-polar. Inamathelisa phakathi kwezinto ezithinta indawo ezungezile nezingezona e-polar futhi ivame ukusetshenziswa kumafilimu ayinhlanganisela we-polyolefin njenge-polypropylene nenayiloni.
I-EVA (i-ethylene vinyl acetate copolymer)
I-EVA yethula i-vinyl acetate monomer ochungechungeni lwamangqamuzana, yehlisa ukucwebezela kwe-polyethylene futhi ithuthukise ukunyibilika nokusebenza kokuvala okushisayo kwezigcwalisi. Okuqukethwe okuhlukile kwe-ethylene ne-vinyl acetate kumphumela wokusetshenziswa okuhlukile:
① Imikhiqizo eyinhloko ye-EVA enokuqukethwe kwe-ethylene acetate ngaphansi kuka-5% yizinto ezinamathelayo, amafilimu, izintambo namakhebuli, njll;
② Imikhiqizo eyinhloko ye-EVA enokuqukethwe kwe-vinyl acetate ka-5% ~ 10% amafilimu anwebekayo, njll;
③ Imikhiqizo eyinhloko ye-EVA enokuqukethwe kwe-vinyl acetate engu-20% ~ 28% yizinto zokunamathisela ezincibilikayo ezishisayo nemikhiqizo yokumboza;
④ Imikhiqizo eyinhloko ye-EVA enokuqukethwe kwe-vinyl acetate engu-5%~45% amafilimu (okuhlanganisa amafilimu ezolimo) namashidi, imikhiqizo ebunjwe ngomjovo, imikhiqizo yegwebu, njll.
Isikhathi sokuthumela: Jun-12-2024