Mutsetse wekuwedzera wePP/PE/PA/PETG/EVOH Multilayer Barrier Sheet
Chiratidzo Chepamusoro Chehunyanzvi
| Muenzaniso wemutsetse | Muenzaniso weExtruder | Upamhi hwezvigadzirwa | Ukobvu hwezvigadzirwa | Dhizaini yekuburitsa dhizaini |
| 7 zvidimbu zvekuwedzera pamwe chete | 120/75/50/60/75 | 800-1200mm | 0.2-0.5mm | 500-600kg/awa |
| 9 zvidimbu zvekuwedzera pamwe chete | 75/100/60/65/50/75/75 | 800-1200mm | 0.05-0.5mm | 700-800kg/awa |
Cherechedza: Zvinodiwa zvinogona kuchinja pasina chiziviso chekutanga.
Mamiriro emusika ekushandiswa kweEVOH pakurongedza
Munyaya yekurongedza chikafu muchando, vanhu vaishandisa zvinhu zvesimbi kana zvegirazi sechikafu kuti vabvise zvinobudirira kupinda kwezvikamu zvakasiyana-siyana zvegasi mukati nekunze kuti vave nechokwadi chekuti zviri mukati uye kukosha kwezvinhu zvirimo zvinoonekwa. Nekuti pane zvinhu zvitatu zvikuru zvinokonzera kuora kwechikafu: zvinhu zvehupenyu (biological enzyme reactions, nezvimwewo), zvinhu zvemakemikari (kunyanya kuora kwezvikamu zvekudya) uye zvinhu zvemuviri (hygroscopic, drying, nezvimwewo). Zvinhu izvi zvine basa mumamiriro ezvinhu ezvakatipoteredza akadai seoxygen, chiedza, tembiricha, hunyoro, nezvimwewo, izvo zvinokonzera kuora kwechikafu. Kudzivirira kuora kwechikafu kunonyanya kudzivirira kuwanda kwetupukanana muchikafu, kudzivirira kuora kwezvikamu zvekudya neoxygen, uye kudzivirira hunyoro uye kuchengetedza kunaka kwepakutanga kwechikafu.
Ethylene-vinyl alcohol copolymer, inozivikanwa seEVOH, inozivikanwa sema "barrier resins" matatu makuru pasi rose pamwe chete nepolyvinylidene chloride (PVDC) nepolyamide (PA) [2]. EVOH inogona kudzivirira zvakanyanya kupinda kweokisijeni mumhepo muzvikafu, nokudaro ichidzivisa kugadzirwa kwechepfu nezvimwe zvinhu zvinokuvadza nekuda kwekuwanda kwetupukanana, uye inogonawo kudzivirira shanduko dzemusanganiswa dzinokonzereswa ne oxidation, uku ichichengetedza kunhuhwirira uye ichidzivirira kusvibiswa kwekunze. Uyezve, kushomeka kwehunyoro hunodzivirira hunyoro kunogona kubhadharwa nedzimwe polyolefin layers. Saka, EVOH multilayer packaging materials inogona kudzivirira zvinobudirira kuora kwechikafu uye kuwedzera nguva yekugara kwayo. Pamusoro pezvo, iri nyore kugadzirisa uye kugadzira, uye ine mashandiro akanaka ekudzivirira nharaunda. Nekuda kwehunhu hwakanaka hwegasi hunodzivirira, kujeka, kugona kugadzirisa uye kuramba solvent kweEVOH resin, minda yayo yekushandisa iri kuwedzera kukura, uye kudiwa kuri kukurawo nekukurumidza.
Resin yeEVOH ine chipingamupinyi chikuru
1. Hunhu hwezvinhu
Hunhu hweEVOH Hunhu hwezvinhu zvinodzivirira zvepolymer hunoreva kugona kwezvigadzirwa kudzivirira magasi madiki emamorekuru, zvinwiwa, utsi hwemvura, nezvimwewo. Mhando dzeresin dzinoshandiswa zvakanyanya pari zvino dzine hunhu hwakanaka hwekudzivirira dzinosanganisira: EVOH, PVDC, PAN, PEN, PA nePET.
2. Kana EVOH ikashandiswa sechinhu chinovhara madziro, inowanzo gadzira chimiro chine mativi akawanda. Zvinhu zvinosanganisa madziro zvinonyanya kushandiswa ndeizvi: PP, HIPS, PE, EVOH, AD, uye AD ndiyo glue iri muchimiro. Chimiro chine mativi akawanda chinogona kupa simba rakazara kuhunhu hwechinhu chimwe nechimwe, kuvandudza kudzivirira kwemvura kweEVOH, uye kuwana chinhu chinovhara madziro chine hunhu hwakanaka. Mazhinji acho aishandiswa mukupakata kunochinjika kare, asi maresini akabatanidzwa akadai sePP, PE, uye PA haasi nyore kurova nekuda kwekuoma kwawo kwakanaka uye kuomarara, izvo zvinoderedza kushandiswa kwawo mumunda wekupakata kwakasimba, kunyanya muzvigadzirwa zvekuzadza online. HIPS inodzivirira kukanganiswa kwepolystyrene ine kuomarara kwakanaka uye hunhu hwakanaka hwekuumba, yakakodzera kubhowa uye yakakodzera zvinhu zvinosanganisa mapuranga. Saka, zvinonyanya kukosha kugadzira zvinhu zvinosanganisa EVOH zvine mativi akawanda zvakakodzera kurongedza kwakasimba.
Nekuda kwekusawirirana zvakanaka pakati peEVOH resin neHIPS resin, uye musiyano mukuru mu resin rheology rate, simba rekubatanidza pakati pe substrate neEVOH, zvinodiwa zve tensile properties yeEVOH panguva yekuumbwa kwechipiri, uye kugoverwa kweEVOH layer panguva ye calendering kugadzira ma composite sheets Kufanana kwezvinhu zvakagadzirwa zvese inyaya huru dzinokanganisa mashandiro nekushandiswa kwezvinhu zvakagadzirwa, uye zvakare matambudziko akaoma anofanirwa kugadziriswa pakugadzira rudzi urwu rwezvinhu zvakagadzirwa.
Chinhu chikuru chetekinoroji ye multi-layer co-extrusion iglue (AD). Zvinhu zvekubatanidza zveEVOH zvinowanzo sanganisira PPEVOH, asi PP neEVOH hazvigone kubatanidzwa zvakananga nekupisa, uye gunde (AD) rinofanira kuwedzerwa pakati pePP neEVOH. Pakusarudza gunde, zvakakosha kufunga nezvegunde rePP sechinhu chepasi, chechipiri kuenderana kwe PP neEVOH zvakanyunguduka, uye chechitatu chinodiwa chehunhu hwekusungirira, kuitira kudzivirira kucheka panguva yekugadzirisa kwechipiri. Naizvozvo, machira akabatanidzwa anowanzova machira mashanu akabatanidzwa (PPADEVOHADPP). /AD/EVOH/AD/R/PP, danda rekunze iPP itsva, uye mamwe machira maviri iPP yakapwanywa zvakare R(PP). Chimiro chisina kuenzana chinogona kushandiswawo, uye zvimwe zvinhu (PE/HIPS, nezvimwewo) zvinogona kuwedzerwa kuti zvisanganiswe. Nheyo yacho yakafanana, uye nzira imwechete ye multi-layer co-extrusion inogona kuwanikwa.
Kushandiswa
Zvinhu zveEVOH zvine hunhu hwakanaka hwekudzivirira. Kuburikidza netekinoroji yekubatanidza michina nePP, PE, PA, PETG nezvimwe zvinhu, zvinogona kugadziriswa kuita zvinhu zvekupaka zvine 5-layer, 7-layer, uye 9-layer high-barrier lightweight, zvinonyanya kushandiswa mukupakata zvisina utachiona, zvinwiwa zvejelly, zvigadzirwa zvemukaka, hove dzakatonhorera uye zvigadzirwa zvenyama nezvimwewo. Muchikamu chisiri chekudya, chinoshandiswa mukupakata mishonga, volatile solvent nedzimwe nzvimbo, ine hunhu hwakanaka hwekudzivirira, izvo zvinovandudza zvakanyanya hupenyu hwesherufu yezvigadzirwa.
