Abstract: Iri bepa rinoongorora dambudziko rewhite point yemafirimu akaumbwa ePET/VMCPP uye PET/VMPET/PE kana aumbwa, uye rinounza mhinduro dzinoenderana.
Aluminium coated composite film is soft packaging material ine “aluminium luster” inoumbwa nekusanganisa aruminiyamu coated films (kazhinji VMPET/VMBOPP, VMCPP/VMPE, etc., pakati payo VMPET neVMCPP ndidzo dzinonyanya kushandiswa) nemafirimu epurasitiki anoonekera.Inoshandiswa pakurongedza kwechikafu, zvigadzirwa zvehutano, zvizorwa, uye zvimwe zvigadzirwa.Nekuda kwekunakisa kwayo simbi inopenya, kurerukirwa, kukwanisika, uye kuita kwakanaka kwezvipingamupinyi kuita, yakashandiswa zvakanyanya (zviri nani zvipingamupinyi zvivakwa pane epurasitiki composite mafirimu, akachipa uye akareruka kupfuura aruminiyamu-plastiki anoumba mafirimu).Nekudaro, mavara machena anowanzoitika panguva yekugadzirwa kwealuminum plated composite mafirimu.Izvi zvinonyanya kuoneka mune akaumbwa firimu zvigadzirwa nePET/VMCPP uye PET/VMPET/PE zvimiro.
1, Zvinokonzera uye mhinduro dze "mavara machena"
Tsanangudzo yechiitiko che "white spot": Pane mavara machena ari pachena pakuonekwa kwefirimu inoumbwa, inogona kugoverwa zvisina tsarukano uye yehukuru hwakafanana.Kunyanya kune asina kudhindwa akadhindwa akaumbwa mafirimu uye yakazara ndiro jena inki kana chiedza chakareruka ingi inoumbwa mafirimu, zviri pachena.
1.1 Kusakwana kwepamusoro tension padivi realuminium plating yealuminium coating.
Kazhinji, kuyedzwa kwekumanikidzana kwepamusoro kunofanirwa kuitwa pamusoro pekona yefirimu rinoshandiswa risati raumbwa, asi dzimwe nguva kuyedzwa kwealuminium coating kunoregeredzwa.Kunyanya kumafirimu eVMCPP, nekuda kwekunaya kwekunaya kwezvidiki zvekuwedzera mamolecular muCPP base firimu, iyo aruminiyamu yakaiswa pamusoro peVMCPP mafirimu akachengetwa kwenguva yakati rebei kutadza kukwana.
1.2 Kusamira zvakanaka kwekunamira
Solvent based adhesives inofanirwa kusarudza iyo yakakwana yekushanda mhinduro yekumisikidza zvinoenderana negwaro rechigadzirwa kuti ive nechokwadi chekugadzirisa glue.Uye viscosity yekuyedza kutonga kunofanirwa kuitwa panguva yekuenderera mberi kwekugadzira composite maitiro.Kana iyo viscosity inowedzera zvakanyanya, zvinonyungudutsa zvinofanira kuwedzerwa pakarepo.Mabhizinesi ane mamiriro anogona kusarudza akavharirwa otomatiki pombi glue midziyo.Iyo yakanyanya kupisa tembiricha yeadhesives isina-solvent inofanirwa kusarudzwa maererano neyakagadzirwa bhuku.Mukuwedzera, tichifunga nezvenyaya ye-solvent-free activation period, mushure menguva yakareba, glue muyero yekuyera inofanira kubudiswa panguva yakakodzera.
1.3 Hurombo hwakaumbwa maitiro
Kune PET / VMCPP zvimiro, nekuda kwehudiki hudiki uye nyore kuwedzera kweVMCPP firimu, iyo lamination roller pressure haifanire kunge yakanyanya kukwirira panguva yekumisikidza, uye mhepo inoputika haifanire kunge yakanyanya kukwirira.Nekudaro, kana PET/VMCPP chimiro chakaumbwa, nekuda kwekuti PET firimu ifirimu rakaomarara, zvinokurudzirwa kuwedzera laminating roller pressure uye kupeta manyawi zvakafanira panguva yemubatanidzwa.
Inoenderana composite process parameters inofanirwa kuumbwa zvichienderana nemamiriro eiyo composite midziyo apo akasiyana aruminiyamu ekuputira zvimiro akaumbwa.
1.4Zvinhu zvekunze zvinopinda mumubatanidzwa firimu zvichikonzera "mavara machena"
Zvinhu zvekune dzimwe nyika zvinonyanya zvinosanganisira huruva, zvimedu zverabha, kana marara.Guruva nemarara zvinonyanya kubva muwekishopu, uye zvinowanzoitika kana hutsanana hwewekishopu husina kunaka.Rubber particles anonyanya kubva murubber discs, coating rollers, kana bonding rollers.Kana iyo composite chirimwa isiri guruva-isina workshop, inofanirawo kuedza kuve nechokwadi chehutsanana uye kutsvinda kweiyo composite workshop, kuisa kubvisa guruva kana kusefa michina (coating device, guide roller, bonding device uye zvimwe zvikamu) zvekuchenesa.Kunyanya iyo coating roller, scraper, flattening roller, nezvimwewo inofanira kucheneswa nguva dzose.
1.5Kunyorova kwakanyanya mumusangano wekugadzira kunotungamira kune "mavara machena"
Kunyanya munguva yekunaya kwemvura, apo humidity yemusangano iri ≥ 80%, iyo firimu inosanganiswa inowanzotarisana ne "mavara machena" chiitiko.Isa tembiricha uye humidity mita muwekishopu kunyora shanduko yetembiricha nehunyoro, uye kuverenga mukana wekuoneka kwemavara machena.Mabhizinesi ane mamiriro anogona kufunga kuisa dehumidification michina.Kune akawanda-layer composite zvimiro zvine zvakanaka zvipingamupinyi zvivakwa, zvinodikanwa kufunga kumisa kugadzirwa kana kugadzira imwe-layer yakawanda kana inopindirana inoumbwa zvimiro.Pamusoro pezvo, nepo uchivimbisa kuita kwakajairika kweanonamira, zvinokurudzirwa kudzikisa huwandu hweanorapa agent inoshandiswa nemazvo, kazhinji ne5%.
1.6 Gluing pamusoro
Kana pasina kukanganisa kwakajeka kunowanikwa uye dambudziko re "mavara machena" harigone kugadziriswa, nzira yekuputira padivi realuminium coating inogona kutariswa.Asi nzira iyi ine miganhu inokosha.Kunyanya kana VMCPP kana VMPET aluminium coating iri pasi pekupisa uye kushushikana muchoto, inotarisana nekugadzirisa deformation, uye nzira yekubatanidza inoda kugadziriswa.Pamusoro pezvo, iyo peel simba realuminium plating layer inogona kudzikira.
1.7 Tsananguro yakakosha yemamiriro ezvinhu apo pasina kukanganisa kwakawanikwa mushure mekuvhara, asi "mavara machena" akaonekwa mushure mekukura:
Iri rudzi rwedambudziko rinowanzo kuitika mucomposite membrane zvimiro zvine zvakanaka zvipingamupinyi zvivakwa.Kune PET/VMCPP uye PET/VMPET/PE zvimiro, kana membrane chimiro chakakora, kana pakushandisa KBOPP kana KPET mafirimu, zviri nyore kugadzira “mavara machena” mushure mekuchembera.
High barrier composite mafirimu ezvimwe zvimiro zvakare anotarisana nedambudziko rimwe chete.Mienzaniso inosanganisira kushandisa gobvu aluminium foil kana mafirimu matete akadai seKNY.
Chikonzero chikuru chechiitiko ichi che "white spot" ndechekuti kune kubuda kwegasi mukati memusanganiswa membrane.Iri gasi rinogona kunge riri kufashamira kwezvisaririra zvinonyungudutsa kana kufashamira kwecarbon dioxide gasi inogadzirwa nekuita pakati peanorapa agent nemhute yemvura.Mushure mokunge gasi rinoputika, nekuda kwezvipingamupinyi zvakanaka zvemuumbi wefirimu, haigoni kusunungurwa, zvichiita kuti pave nekuonekwa kwe "mavara machena" (mabhubhu) mumutsara wakagadzirwa.
Solution: Paunenge uchibatanidza solvent based adhesive, maitiro ekugadzirisa akadai sekushisa kwevheni, mhepo yemhepo, uye kudzvinyirira kusina kunaka kunofanira kuiswa zvakanaka kuti ive nechokwadi chokuti hapana chakasara chekunyungudutsa mumucheka wekunamatira.Dzora humidity mumusangano uye sarudza yakavharwa adhesive coating system.Funga kushandisa mushonga unorapa usingaburitse mabubbles.Mukuwedzera, paunenge uchishandisa solvent based adhesives, zvakakosha kuti uedze hunyoro huri muhuturo, nezvinodiwa zvehunyoro ≤ 0.03%.
Izvo zviri pamusoro apa insumo yechiitiko che "mavara machena" mumafirimu akaumbwa, asi kune zvikonzero zvakasiyana-siyana zvinogona kukonzera matambudziko akadaro mukugadzirwa kwechokwadi, uye zvinodikanwa kuita kutonga uye kuvandudzwa zvichienderana nemamiriro chaiwo ekugadzira.
Nguva yekutumira: Zvita-11-2023