PP/PE/PA/PETG/EVOH Multilayer Barrier Sheet Co-extrusion Line
Ipharamitha Eyinhloko Yezobuchwepheshe
| Imodeli yomugqa | Imodeli ye-Extruder | Ububanzi bemikhiqizo | Ukujiya kwemikhiqizo | Design extrusion okukhiphayo |
| 7 izendlalelo co-extrusion | 120/75/50/60/75 | 800-1200 mm | 0.2-0.5mm | 500-600kg/h |
| 9 izendlalelo co-extrusion | 75/100/60/65/50/75/75 | 800-1200 mm | 0.05-0.5mm | 700-800kg/h |
Qaphela: Imininingwane ingashintsha ngaphandle kwesaziso sangaphambili.
Isimo semakethe sezinhlelo zokusebenza zokupakisha ze-EVOH
Emkhakheni wokupakisha ukudla okubandayo, abantu basebenzisa izinto zensimbi noma zengilazi njengokupakisha ukudla ukuze bahlukanise ngokuphumelelayo ukungena kwezingxenye ezihlukahlukene zegesi ngaphakathi nangaphandle ukuze kuqinisekiswe ikhwalithi yokuqukethwe kanye nenani lempahla. Ngoba kunezici ezintathu ezinkulu ezibangela ukubola kokudla: izici zebhayoloji (ukusabela kwe-enzyme yezinto eziphilayo, njll.), izici zamakhemikhali (ikakhulukazi i-oxidation yezingxenye zokudla) kanye nezici zomzimba (hygroscopic, drying, njll.). Lezi zici zidlala indima ezimweni zemvelo ezifana ne-oxygen, ukukhanya, izinga lokushisa, umswakama, njll, okubangela ukubola kokudla. Ukuvimbela ukuwohloka kokudla ngokuyinhloko ukuvimbela ukwanda kwama-microorganisms ekudleni, ukuvimbela i-oxidation yezingxenye zokudla nge-oxygen, nokuvimbela umswakama nokugcina ukunambitheka kwangempela kokudla.
I-Ethylene-vinyl alcohol copolymer, ebizwa ngokuthi i-EVOH, yaziwa njengezinhlaka ezintathu ezinkulu zomhlaba ezithiyo kanye ne-polyvinylidene chloride (PVDC) kanye ne-polyamide (PA) [2]. I-EVOH ingavimbela kakhulu ukungena komoya-mpilo emoyeni ekudleni, ngaleyo ndlela ivimbele ukukhiqizwa kwezinto ezinobuthi nezinye izinto eziyingozi ngenxa yokwanda kwama-microorganisms, futhi ingavimbela izinguquko zokubunjwa okubangelwa i-oxidation, kuyilapho igcina iphunga futhi ivimbela ukungcoliswa kwephunga langaphandle. Ngaphezu kwalokho, ukuntuleka kwezakhiwo zokuvimbela umswakama kunganxeshezelwa ngezinye izendlalelo ze-polyolefin. Ngakho-ke, izinto zokupakisha ze-EVOH multilayer zingavimbela ngempumelelo ukonakaliswa kokudla futhi zandise impilo yeshalofu. Ngaphezu kwalokho, kulula ukuyicubungula nokwenza, futhi inokusebenza okuhle kokuvikela imvelo. Ngenxa yezakhiwo ezinhle kakhulu zokuvimbela igesi, ukucaca, ukucutshungulwa kanye nokumelana ne-solvent ye-EVOH resin, izinkambu zokufaka isicelo ziya ngokuya ziba banzi, futhi isidingo sikhula ngokushesha.
I-resin ephezulu yokuvimbela i-EVOH
1. Izinto ezibonakalayo
Izakhiwo zokuvimbela ze-EVOH Izakhiwo zokuvimbela izinto ze-polymer zibhekisela ekhonweni lokuvikela lemikhiqizo kumagesi amancane amangqamuzana, uketshezi, umhwamuko wamanzi, njll. kanye ne-PET.
2. Uma i-EVOH isetshenziswa njengento ephezulu yokuvimbela, ngokuvamile ithatha isakhiwo esiyinhlanganisela yezendlalelo eziningi. Izinto ezisetshenziswa kakhulu eziyinhlanganisela yilezi: PP, HIPS, PE, EVOH, AD, kanye ne-AD ingcina esakhiweni. Isakhiwo esinezingqimba eziningi singanikeza ukudlala okugcwele kuzakhiwo zento ngayinye, sithuthukise ukumelana namanzi kwe-EVOH, futhi sithole izinto ezivimbelayo eziphezulu ezinezakhiwo ezinhle kakhulu eziphelele. Iningi lazo lalisetshenziswa emaphaketheni aguquguqukayo esikhathini esidlule, kodwa ama-resin ahlanganisiwe afana ne-PP, PE, ne-PA akulula ukuwashaya ngenxa yokuqina kwawo okuhle nokuqina okubuthakathaka, okunciphisa ukusetshenziswa kwawo emkhakheni wokupakisha okuqinile, ikakhulukazi imikhiqizo yokugcwalisa ku-inthanethi. I-HIPS ye-polystyrene engazweli nomthelela inokuqina okuhle kanye nezakhiwo ezinhle kakhulu zokubumba, ezifanele ukubhoboza futhi ifanele izinto zokupakisha eziqinile. Ngakho-ke, kuphuthuma ngokukhethekile ukuthuthukisa ngamandla i-EVOH high-barrier composite materials ezifanele ukupakishwa kanzima.
Ngenxa yokungahambisani kahle phakathi kwe-EVOH resin ne-HIPS resin, nomehluko omkhulu wezinga le-resin rheology, amandla okubopha phakathi kwe-substrate ne-EVOH, izimfuneko zezakhiwo eziqinile ze-EVOH ngesikhathi sokubumba kwesibili, kanye nokusatshalaliswa kongqimba lwe-EVOH phakathi nekhalenda khiqiza amashidi ahlanganisiwe Ukufana kwezinto ezihlanganisiwe yizo zonke izindaba ezibalulekile ezithinta ukusebenza nokusetshenziswa kwezinto ezihlanganisiwe, futhi kuyizinkinga ezinzima ezidinga ukuxazululwa lapho kukhiqizwa lolu hlobo lwezinto ezihlanganisiwe.
Isihluthulelo sobuchwepheshe be-co-extrusion enezingqimba eziningi i-adhesive (AD). Izinto zokupakisha eziyinhlanganisela ye-EVOH ngokuvamile zihlanganisa i-PPEVOH, kodwa i-PP ne-EVOH azikwazi ukubopha ngokuqondile ngokushisa, futhi okunamathelayo (AD) kufanele kwengezwe phakathi kwe-PP ne-EVOH. Lapho ukhetha i-adhesive, kubalulekile ukucabangela ukunamathela kwe-PP njengento eyisisekelo, okwesibili ukuhambisana kwe-viscosity encibilikayo ye-PP ne-EVOH, kanti okwesithathu imfuneko yezakhiwo eziqinile, ukuze ugweme ukuchithwa ngesikhathi sesibili. ukucubungula. Ngakho-ke, amashidi akhishwe ngokuhlanganyela ngokuvamile amashidi anezendlalelo ezinhlanu-extruded (PPADEVOHADPP). /AD/EVOH/AD/R/PP, isendlalelo esingaphandle siyinto entsha ye-PP, kanti ezinye izendlalelo ezimbili ziyi-PP egaywe kabusha impahla egaywe kabusha engu-R(PP). Isakhiwo se-asymmetric singasetshenziswa, nezinye izinto (PE/HIPS, njll.) ama-extruder angangezwa ukuze kuhlanganiswe ndawonye. Umgomo uyafana, futhi indlela efanayo ye-multi-layer co-extrusion ingafinyelelwa.
Isicelo
Impahla ye-EVOH inezinto ezinhle zokuvimbela. Ngobuchwepheshe be-co-extrusion nge-PP, PE, PA, PETG nezinye izinto, ingacutshungulwa ibe yi-5-layer, 7-layer, kanye ne-9-layer high-barrier lightweight lightweight, esetshenziswa kakhulu ekufakweni kwe-aseptic, iziphuzo ze-jelly, imikhiqizo yobisi, izinhlanzi ezibandayo kanye nemikhiqizo yenyama yokupakisha njll. Esicini esingewona ukudla, isetshenziselwa ukufakwa kwemithi, okuguquguqukayo kwe-solvent kanye neminye imikhakha, enezakhiwo ezinhle kakhulu zokuvimbela, ezithuthukisa kakhulu impilo yeshalofu yemikhiqizo.
