Kuti uwedzere hupenyu hwesherufu hwezvinhu zvakadai sechikafu nemishonga, zvakawandakurongedza zvinhuzvechikafu nemishonga mazuva ano shandisa multi-layer packaging composite films. Parizvino, kune maviri, matatu, mashanu, manomwe, mapfumbamwe, uye kunyange gumi nerimwe akaturikidzana ezvakasanganiswa zvekurongedza zvinhu. Multi layer yekurongedza firimu ifirimu rakatetepa rakagadzirwa nekuburitsa akawanda epurasitiki zvigadzirwa mumatanho akawanda panguva imwe chete kubva pakuvhurika kwemold imwe, iyo inogona kukwirisa zvakanakira zvinhu zvakasiyana.
Multi layerkurongedza firimu rollinonyanya kuumbwa ne polyolefin musanganiswa. Parizvino, zvivako zvinowanzoshandiswa zvinosanganisira: polyethylene / polyethylene, polyethylene ethylene vinyl acetate copolymer / polypropylene, LDPE / adhesive layer / EVOH / adhesive layer / LDPE, LDPE / adhesive layer / EVH / EVOH / EVOH / adhesive layer / LDPE. Ukobvu hwega hwega hunogona kugadziriswa kuburikidza neextrusion tekinoroji. Nekugadzirisa hupamhi hwechivharo chevhavha uye kushandisa zvakasiyana-siyana zvekudzivirira zvinhu, mafirimu anoshanduka ane maitiro akasiyana-siyana anogona kugadzirwa. Iyo yekupisa seal seal layer zvinhu zvinogona zvakare kuchinjika kutsiviwa uye kugadziridzwa kusangana nezvinodiwa zvepakeji dzakasiyana. Iyi yakawanda-layer uye multifunctional packaging composite ndiyo inotungamira nzira yekuvandudza yekurongedza firimu zvinhu mune ramangwana.
Multi layer packaging composite firimu chimiro
Multi layer packaging composite firimu, zvisinei nenhamba yezvikamu, inowanzo patsanurwa kuita base layer, inoshanda layer, uye inonamira layer zvichibva pane mashandiro ega rega refirimu.
Basic level
Kazhinji, iwo emukati uye ekunze akaturikidzana emafirimu akaumbwa anofanirwa kuve neakanaka emuviri uye mekiniki zvivakwa, achigadzira mashandiro ekugadzirisa, uye kupisa seal seal layer. Inodawo kuve nekuita kwakanaka kwekuisa chisimbiso chekupisa uye kupisa kwemoto welding, izvo zvine mutengo wakaderera, kuve nerutsigiro rwakanaka uye nekuchengetedza mhedzisiro pane inoshanda layer, uye kuve nechikamu chepamusoro mufirimu inoumbwa, inotaridza kuomarara kwese kweiyo composite firimu. . Zvigadzirwa zvepasi zvakanyanya PE, PP, EVA, PET, uye PS.
Functional layer
The functional layer yefirimu rekurongedza chikafuinonyanya kuvharidzira, kazhinji iri pakati pemafirimu akawanda-layer composite, kunyanya kushandisa zvipingamupinyi zvakadai seEVOH, PVDC, PVA, PA, PET, etc. Pakati pavo, iyo inonyanya kushandiswa yakakwirira yekudzivirira zvinhu ndeyeEVOH nePVDC. , uye iyo yakajairwa PA nePET ine zvakafanana zvipingamupinyi zvivakwa, zvepakati zvipingamupinyi zvinhu.
EVOH (ethylene vinyl doro copolymer)
Ethylene vinyl doro copolymer chinhu chepolymer chinosanganisa kufambiswa kweethylene polymers uye gasi barriers zvimiro zveethylene doro mapolima. Inonyatsojeka uye ine gloss yakanaka. EVOH ine yakanakisa chipingamupinyi zvivakwa zvegasi neoiri, ine yakanakisa mechanical kusimba, elasticity, kupfeka kuramba, kutonhora kuramba, uye simba repamusoro, uye yakanakisa kugadzirisa mashandiro. Iko kuvharidzira kuita kweEVOH kunoenderana neiyo ethylene yemukati. Kana iyo ethylene yemukati ichiwedzera, gasi chipingamupinyi kuita chinodzikira, asi hunyoro kuramba kuita kunowedzera, uye zviri nyore kugadzirisa.
Zvigadzirwa zvakaputirwa nezvinhu zveEVOH zvinosanganisira mwaka, zvigadzirwa zvemukaka, zvigadzirwa zvenyama, zvigadzirwa zvechizi, nezvimwe.
PVDC (polyvinylidene chloride)
Polyvinylidene chloride (PVDC) ipolymer yevinylidene chloride (1,1-dichlorethylene). Tembiricha yekuora yehomopolymer PVDC yakadzikira pane yekunyungudika kwayo, zvichiita kuti inonetsa kunyungudika. Naizvozvo, sechinhu chekurongedza, PVDC icopolymer yevinylidene chloride uye vinyl chloride, ine yakanaka airtightness, corrosion resistance, yakanaka kudhinda uye kupisa chisimbiso zvinhu.
Mumazuva ekutanga, yainyanya kushandiswa kurongedza zvechiuto. Mumakore ekuma1950, yakatanga kushandiswa sefirimu rekuchengetedza chikafu, kunyanya nekuvandudzwa kweruzivo rwechizvino-zvino rwekurongedza uye kukurumidza kwehupenyu hwevanhu, kukurumidza kutonhora uye kuchengetedza kurongedza, shanduko yemicrowave cookware, uye kuwedzera kwekudya uye. Upenyu hwemasherufu ezvinodhaka hwaita kuti kushandiswa kwePVDC kuve kukurumbira. PVDC inogona kugadzirwa kuita ultra-thin films, ichidzikisa huwandu hwezvinhu zvakabikwa uye mutengo wekurongedza. Ichiri kufarirwa nhasi
Adhesive layer
Nekuda kwekusabatana zvakanaka pakati pemamwe mabhesi resin uye anoshanda layer resin, zvinodikanwa kuisa mamwe anonamira akaturikidzana pakati pematanho maviri aya kuti aite seglue uye kugadzira firimu rakasanganiswa. Iyo inonamira layer inoshandisa adhesive resin, inowanzoshandiswa inosanganisira polyolefin yakabatanidzwa ne maleic anhydride uye ethylene vinyl acetate copolymer (EVA).
Maleic anhydride yakabatanidzwa polyolefins
Maleic anhydride grafted polyolefin inogadzirwa nekubatanidza maleic anhydride pa polyethylene kuburikidza ne reactive extrusion, kuunza polar side mapoka pane asiri-polar cheni. Iyo inonamira pakati pepolar uye isiri-polar zvinhu uye inowanzoshandiswa mumafirimu akaumbwa e polyolefins akadai se polypropylene uye naironi.
EVA (ethylene vinyl acetate copolymer)
EVA inounza vinyl acetate monomer mucheni yemolecular, ichidzikisa kuchena kwepolyethylene uye kuvandudza kunyungudika uye kupisa kwekuisa chisimbiso kuita kwemafiller. Izvo zvakasiyana zvemukati zve ethylene uye vinyl acetate mune zvigadzirwa zvinoguma nekushandisa kwakasiyana:
① Zvigadzirwa zvikuru zveEVA zvine ethylene acetate zviri pazasi 5% zvinonamira, mafirimu, waya uye tambo, nezvimwe;
② Zvigadzirwa zvikuru zveEVA zvine vinyl acetate ye5% ~ 10% mafirimu elastic, nezvimwe;
③ Mishonga mikuru yeEVA ine vinyl acetate yemukati ye20% ~ 28% inopisa inonyunguduka inonamatira uye zvigadzirwa zvekupfeka;
④ Zvigadzirwa zvikuru zveEVA zvine vinyl acetate ye5% ~ 45% mafirimu (kusanganisira mafirimu ekurima) nemashiti, zvigadzirwa zvakaumbwa nejekiseni, zvigadzirwa zvefuro, nezvimwe.
Nguva yekutumira: Jun-12-2024