Ukuze kwandiswe ubomi beshelufu yezinto ezifana nokutya kunye neziyobisi, ezininziizinto zokupakishangokutya kunye neziyobisi kule mihla zisebenzisa iifilimu ezihlanganisiweyo zokupakisha ezinemigangatho emininzi. Okwangoku, zimbini, zintathu, zintlanu, zisixhenxe, zilithoba, kwaye zilishumi elinanye iileya zezixhobo zokupakisha ezihlanganisiweyo. Ifilimu yokupakisha yomaleko amaninzi yifilimu ecekethekileyo eyenziwe ngokukhupha izinto ezininzi zeplastiki ekrwada kwiitshaneli ezininzi ngaxeshanye ukusuka kwindawo enye yokuvula, enokuthi inyuse izibonelelo zezixhobo ezahlukeneyo.
Umaleko omninziukupakisha ifilimu rollubukhulu becala zenziwa yindibaniselwano yepololefin. Okwangoku, izakhiwo ezisetyenziswa ngokuqhelekileyo ziquka: 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. Ubuninzi bomaleko ngamnye bunokulungelelaniswa ngeteknoloji ye-extrusion. Ngokuhlengahlengisa ubukhulu boluhlu lwesithintelo kunye nokusebenzisa izinto ezahlukeneyo zomqobo, iifilimu eziguquguqukayo ezineempawu ezahlukeneyo zomqobo zinokuyilwa. Izinto zomaleko wokutywinwa kobushushu nazo zinokutshintshwa ngokuguquguqukayo kwaye zilungelelaniswe ukuhlangabezana neemfuno zokupakisha ezahlukeneyo. Lo mxube wokupakisha we-multi-layer kunye ne-multifunctional lukhokelo oluphambili lokuphuhliswa kwezinto zefilimu zokupakisha kwixesha elizayo.
Ukupakishwa kwamaleko amaninzi kubume befilimu edibeneyo
Ifilimu ehlanganisiweyo yokupakishwa kwamaleko amaninzi, kungakhathaliseki inani leeleya, yahlulahlulwe ngokubanzi ngokwesiseko, umaleko osebenzayo, kunye nomaleko wokuncamathelisa ngokusekelwe kumsebenzi womaleko ngamnye wefilimu.
Inqanaba elisisiseko
Ngokubanzi, iileya zangaphakathi kunye nangaphandle zeefilimu ezidibeneyo kufuneka zibe neempawu ezilungileyo zomzimba kunye nezomatshini, zenze umsebenzi wokucubungula, kunye nomaleko wokutywina ubushushu. Kwakhona kufuneka ibe nokusebenza kakuhle kokutywinwa kobushushu kunye nokusebenza kwe-welding eshushu, enexabiso eliphantsi ngokwentelekiso, ibe nenkxaso efanelekileyo kunye neziphumo zokugcinwa kuluhlu olusebenzayo, kwaye ibe neyona nxalenye iphezulu kwifilimu edibeneyo, emisela ukuqina okupheleleyo kwefilimu edibeneyo. . Izinto ezisisiseko ziyi-PE, PP, EVA, PET, kunye ne-PS.
Umaleko osebenzayo
Umaleko osebenzayo weifilimu yokupakisha ukutyaubukhulu becala i-barrier layer, ngokuqhelekileyo iphakathi kwefilimu edibeneyo ye-multi-layer composite, ngokukodwa isebenzisa i-resin yokuthintela njenge-EVOH, i-PVDC, i-PVA, i-PA, i-PET, njl. , kunye ne-PA kunye ne-PET eqhelekileyo ineempawu zomqobo ezifanayo, ezizezezinto zomqobo ophakathi.
I-EVOH (i-ethylene vinyl alcohol copolymer)
I-ethylene vinyl alcohol copolymer yimathiriyeli yepolymer edibanisa ukusetyenzwa kweepolima ze-ethylene kunye neempawu zokuthintela igesi ye-ethylene alcohol polymers. Icace kakhulu kwaye ineglosi elungileyo. I-EVOH ineempawu ezigqwesileyo zokuthintela iigesi kunye neoyile, inamandla omatshini abalaseleyo, ukuqina, ukumelana nokunxiba, ukumelana nokubanda, kunye namandla angaphezulu, kunye nokusebenza okugqwesileyo. Ukusebenza komqobo we-EVOH kuxhomekeke kumxholo we-ethylene. Xa umxholo we-ethylene usanda, ukusebenza komqobo wegesi kuyehla, kodwa ukusebenza kokumelana nokufuma kuyanda, kwaye kulula ukusetyenzwa.
Iimveliso ezipakishwe ngezinto ze-EVOH ziquka i-seasonings, iimveliso zobisi, iimveliso zenyama, iimveliso zetshizi, njl.
I-PVDC (i-polyvinylidene chloride)
I-Polyvinylidene chloride (PVDC) i-polymer ye-vinylidene chloride (1,1-dichlorethylene). Iqondo lokushisa lokubola kwe-homopolymer PVDC lisezantsi kunendawo yokunyibilika, okwenza kube nzima ukunyibilika. Ngoko ke, njengento yokupakisha, i-PVDC i-copolymer ye-vinylidene chloride kunye ne-vinyl chloride, ene-airtightness efanelekileyo, ukumelana nokugqwala, ukuprintwa kakuhle kunye nokutywinwa kokushisa.
Kwiintsuku zokuqala, yayisetyenziselwa ukupakishwa komkhosi. Ngeminyaka yee-1950s, yaqala ukusetyenziswa njengefilimu yokugcina ukutya, ngakumbi ngophuhliso olukhawulezayo lwetekhnoloji yokupakisha yale mihla kunye nesantya sobomi babantu bale mihla, ukukhenkceza okukhawulezileyo kunye nokugcinwa kopakisho, uguqulo lwezixhobo zokupheka ze-microwave, kunye nokwandiswa kokutya kunye ne ubomi kwishelufu yeziyobisi zenze ukusetyenziswa kwePVDC kwaziwa kakhulu. I-PVDC inokwenziwa kwiifilimu ezi-ultra-thin, ukunciphisa inani lezinto eziluhlaza kunye neendleko zokupakisha. Isathandwa nanamhlanje
Umaleko wokuncamathelisa
Ngenxa yokungahambelani kakuhle phakathi kwezinye iireyini ezisisiseko kunye neeresina zomaleko ezisebenzayo, kuyafuneka ukuba kubekwe ezinye iileya zokuncamathelisa phakathi kwezi maleko zimbini ukuze zisebenze njengeglu kwaye zenze ifilimu edibeneyo edibeneyo. I-adhesive layer isebenzisa intlaka yokuncamathelisa, esetyenziswa ngokuqhelekileyo ibandakanya i-polyolefin ehlonyelwe i-anhydride ye-maleic kunye ne-ethylene vinyl acetate copolymer (EVA).
I-anhydride ye-Maleic ifakwe i-polyolefins
I-Maleic anhydride ehlonyelwe i-polyolefin iveliswa ngokufakela i-anhydride ye-maleic kwi-polyethylene ngokusebenzisa i-extrusion esebenzayo, ukwazisa amaqela asecaleni kwi-polar kumatyathanga angengo-polar. Yinto encamathelayo phakathi kwezixhobo ze-polar kunye ne-non-polar kwaye isetyenziswa ngokuqhelekileyo kwiifilimu ezidibeneyo ze-polyolefins ezifana ne-polypropylene kunye ne-nylon.
EVA (ethylene vinyl acetate copolymer)
I-EVA yazisa i-vinyl acetate monomer kwikhonkco le-molecular, ukunciphisa i-crystallinity ye-polyethylene kunye nokuphucula ukunyibilika kunye nokusebenza kokutywinwa kwe-thermal kwezihluzi. Imixholo eyahlukeneyo ye-ethylene kunye ne-vinyl acetate kwizixhobo zikhokelela kwizicelo ezahlukeneyo:
① Iimveliso eziphambili ze-EVA ezinomxholo we-ethylene acetate ngaphantsi kwe-5% zizincamathelisi, iifilimu, iingcingo kunye neentambo, njl.
② Iimveliso eziphambili ze-EVA kunye nomxholo we-vinyl acetate we-5% ~ 10% iifilimu ze-elastic, njl;
③ Iimveliso eziphambili ze-EVA kunye nomxholo we-vinyl acetate we-20% ~ 28% yizinto zokuncamathela ezishushu ezinyibilikayo kunye neemveliso zokugquma;
④ Iimveliso eziphambili ze-EVA ezinomxholo we-vinyl acetate we-5% ~ 45% ziifilimu (kubandakanywa neefilimu zezolimo) kunye namaphepha, iimveliso ezibunjiweyo zenaliti, iimveliso ze-foam, njl.
Ixesha lokuposa: Jun-12-2024