Indlela Yokuphulukisa Ukumbozwa Kwepulasitiki Ngefilimu Yepulasitiki Nge-UV LED
Ukwazi ukwelapha ukumbozwa kwifilimu yepulasitiki ngobuchwepheshe be-UV LED kuba indinganiso yegolide yabakhiqizi abadinga ijubane, ukunemba, nokusebenza kahle kwamandla ngaphandle kokulimaza ama-substrates azwela ukushisa. Ezweni lokuncintisana lokuguqula nokupakisha, ukushintsha kusuka ezibani zendabuko ze-mercury noma ukomisa okushisayo kuya ezinhlelweni ze-UV LED akuyona nje ukuthuthukisa-kungukuguqulwa. Ngokusebenzisa inqubo yokuphulukisa "ebandayo", ungacubungula amafilimu amancane, abucayi afana ne-PET, i-BOPP, ne-PE ngesivinini esiphakeme kunanini ngaphambili. Lo mhlahlandlela ungena ngokujulile kuma-nuances wezobuchwepheshe, ukunqoba izinselelo zokunamathela, nokwenza ngcono umugqa wakho wokukhiqiza ngemiphumela engenasici.
Kuyini ukwelashwa kwe-UV LED kwamafilimu epulasitiki?
Ukuphulukiswa kwe-UV LED kwamafilimu epulasitiki kuyinqubo ye-photopolymerization esebenzisa ama-diode akhipha ukukhanya okuphezulu kwe-ultraviolet ukwenza lukhuni ngokushesha ukumbozwa koketshezi, ama-inks, noma okunamathisela kuma-substrates azwela ukushisa. Ngokungafani nezibani ze-mercury, ama-LED e-UV akhipha ubude obuncane, be-monochromatic (imvamisa i-365nm, 385nm, noma i-395nm) ebangela ama-photoinitiators ngaphandle kokukhiqiza ukushisa kwe-infrared okulimazayo okusonteka noma ukunciphisa amafilimu epulasitiki.
The Shift from Thermal to "Cold" Curing
Kwaphela amashumi eminyaka, ukuphulukisa ifilimu yepulasitiki kwakuyisenzo sokulinganisa. Udinga amandla anele ukuxhuma i-polymer kodwa kwadingeka uphathe ngokucophelela ukushisa ukuze ugweme "ukuvimba" (lapho ifilimu inamathela khona) noma ukuhlanekezela. Izibani zendabuko ze-mercury arc zikhipha ububanzi obubanzi bokukhanya, kufaka phakathi inani elikhulu lamandla e-infrared (IR). La mandla e-IR ukushisa okulahlekile okudlulisela ngqo kuwebhu yakho yepulasitiki.
Izinhlelo ze-UV LED zixazulula lokhu ngokukhipha amandla apholile, agxile. Ama-LED aguqula amandla kagesi ngqo ekukhanyeni kwe-UV ngokudluliswa okuncane kokushisa ku-substrate. Lokhu kukuvumela ukuthi:
- Sebenzisa amafilimu azwela ukushisa: Cubungula amafilimu amancane we-gauge shrink namafilimu e-elekthronikhi angawohloka ngaphansi kwama-oveni ashisayo.
- Qeda ama-Chill Rolls: Ezimweni eziningi, umthwalo wokushisa oncishisiwe ususa isidingo sama-roller abandayo abizayo, adla isikhala.
- Ukuvula / ukucima okusheshayo: Ama-LED e-UV awadingi isikhathi sokushisa. Ungawacima ngokushesha lapho umugqa uyeka, ukuvimbela ukushiswa kwewebhu emile—ikhanda elijwayelekile elinezibani ezishisayo ze-mercury.
Isebenza kanjani inqubo yokuphulukisa ye-UV LED kupulasitiki?
Le nqubo isebenza ngokufanisa ukukhishwa kwe-wavelength ethile ye-UV LED kuma-photoinitiators ekugqokeni, okubangela ukusabela kwamakhemikhali okusheshayo okuguqula uketshezi lube yinto eqinile exhunywe esiphambanweni. Njengoba ifilimu yepulasitiki idlula ngaphansi kohlu lwe-LED, ukukhanya okuphezulu kungena ungqimba lokumboza, kuqale i-polymerization kuma-milliseconds ngenkathi kushiya ipulasitiki eyisisekelo ingathinteki ukucindezeleka okushisayo.
Step-by-Step Curing Workflow
Ukuze uthole ukwelashwa okuphelele kwifilimu yepulasitiki, inqubo kufanele ilawulwe ngokuqinile. Nakhu ukuhamba komsebenzi okujwayelekile:
- Ukulungiswa komhlaba: Amafilimu epulasitiki avame ukuba namandla aphansi (alinganiswe ngama-dynes). Ngaphambi kokumboza, ifilimu imvamisa ithola ukwelashwa kwe-corona noma i-plasma ukwandisa amandla angaphezulu futhi ithuthukise amanzi.
- Isicelo Senamathela: Ukwakheka kwamanzi (i-varnish, ijazi eliqinile, noma ukunamathela) kusetshenziswa ngezindlela ze-gravure, i-flexo, noma i-slot-die.
- Ukufanisa ubude be-Wavelength: Ukwakheka kufanele kuqukethe ama-photoinitiators amunca amandla esiqongweni esithile se-LED (isib, 395nm). Qaphela: Ukusebenzisa ukwakheka okuklanyelwe izibani ze-mercury (i-spectrum ebanzi) ngesibani se-LED kuvame ukuholela ekuphazamiseni komhlaba.
- Ukuchayeka: Ifilimu idlula ngaphansi kwekhanda lesibani se-UV LED. Ibanga libalulekile; Isibani sivame ukugibela i-5-10mm kusuka kuwebhu ukukhulisa ukukhanya okuphezulu.
- Ukuxhumanisa isiphambano: Ama-photoinitiators amunca ama-photons, adale ama-radicals wamahhala axhumanisa ama-monomers nama-oligomers kunethiwekhi ye-polymer eqinile.
- Ukulawulwa kwekhwalithi: Ifilimu ihlolwa ukunamathela (ukuhlolwa kwetheyiphu) kanye nezinga lokuphulukisa (ukuhlolwa kwe-solvent rub) ngokushesha ngemuva kwesibani.
Yiziphi izimbobo ezingalapheka nge-UV LED?
Ubuchwepheshe be-UV LED bungaphulukisa ukumbozwa okuhlukahlukene kupulasitiki, kufaka phakathi ama-acrylates, ama-silicones, nama-varnishes avikelayo akhethekile, inqobo nje uma akhiwe ngama-photoinitiators aqondene ne-LED. Izinhlelo zokusebenza ezivame kakhulu zifaka amajazi aqinile asebenzayo okubonisa, ukumbozwa okuthambile kokupakisha, kanye ne-varnishes ecwebezelayo ephezulu yokuvikelwa kwelebula.
Formulating for the Spectrum
Ukuphumelela kwenqubo yakho yokuphulukisa kuxhomeke ngokuphelele kumakhemikhali. Ngoba ama-UV LED angama-monochromatic (akhipha ukukhanya ebhendi elincane kakhulu), awukwazi ukusebenzisa ukumbozwa okujwayelekile kwe-UV "off-the-shelf".
- I-Free-Radical Acrylates: Ihhashi lomsebenzi embonini. Lezi zilapha ngokushesha okukhulu futhi zilungele imigqa yewebhu enejubane eliphezulu.
- Ama-Epoxies e-Cationic: Lezi zilapha kancane kodwa zinikeza ukunamathela okuhle kakhulu nokuncipha okuphansi, okubalulekile kumapulasitiki angagoba. Kodwa-ke, kunzima ukwelapha nge-LED yodwa ngaphandle kokuzwela.
- Izinhlelo ze-Dual-Cure Systems: Amanye amafomu anamuhla ahlanganisa izindlela zokuqinisekisa ukwelashwa komhlaba (ukuvimbela ukuvinjelwa kwe-oksijini) kanye nokwelashwa okujulile.
Uma ushintsha umugqa wakho, kufanele uthintane nomhlinzeki wakho wamakhemikhali ukuze uqinisekise ukuthi i-varnish yakho noma ukumbozwa "kulungele i-LED."
Ukuze uthole ukucwila okujulile kumakhemikhali ahambisanayo, funda umhlahlandlela wethu ku Yiziphi izimbobo ezingalapheka nge-UV LED?
Uyinqoba kanjani izinselelo zokunamathela kumafilimu epulasitiki?
Unqoba izinselelo zokunamathela ngokwandisa amandla ebusweni be-substrate ngokusebenzisa ukwelashwa kwe-corona noma i-plasma nokuqinisekisa ukuthi ukungezwani komhlaba kwesembozo kuphansi kunalokho kwepulasitiki ephathwayo. Ngaphezu kwalokho, ukukhetha ukumbozwa kwe-UV LED enezakhiwo eziphansi zokuncipha kubalulekile, njengoba ukuncipha okuphezulu ngesikhathi sokuphulukiswa okusheshayo kungadonsa ukumbozwa kude nepulasitiki ebushelelezi, okuholela ekukhiqizeni.
Inkinga ye- "Wetting"
Amafilimu epulasitiki afana ne-polypropylene (PP), i-Polyethylene (PE), ne-Polyester (PET) ngokwemvelo ayiwona ama-porous futhi ayisebenzi ngamakhemikhali. Uma ufaka i-UV enamathela ngqo, kungenzeka ukuthi izokhuphuka noma iphume njengesitikha.
Imikhuba engcono kakhulu yokunamathela:
- Ukwelashwa kwe-In-Line Corona: Faka i-corona treater ngokushesha ngaphambi kwesiteshi sokumboza. Lokhu "kunzima" ubuso bamangqamuzana epulasitiki, kudala izindawo zokubopha.
- I-Anchor Coatings (Primers): Kuma-substrates anzima, ukusebenzisa i-primer encane yamanzi noma i-UV kungasebenza njengebhuloho phakathi kwepulasitiki ne-topcoat.
- I-Nitrogen Inerting: I-oksijini ivimbela ukwelashwa kwesendlalelo esingaphezulu, ishiye i-tacky. Emigqeni yefilimu enejubane eliphezulu, ukugcwala indawo yokwelapha nge-nitrogen kususa umoya-mpilo, okuvumela ukwelashwa okunzima, okusheshayo nokumelana okungcono kwamakhemikhali.
Can UV LED Cure Powder Coating on Plastic Film?
Yebo, i-UV LED ingaphulukisa ukumbozwa kwempuphu kwifilimu yepulasitiki, kepha idinga inqubo ekhethekile lapho i-powder incibilika khona ekushiseni okuphansi (nge-IR) ngaphambi kokuxhunyaniswa ngokushesha nokukhanya kwe-UV LED. Lokhu kuhlukaniswa kwezigaba "zokuncibilika" kanye "nokwelapha" kuvimbela ifilimu yepulasitiki ukuthi ivezwe emazingeni okushisa aphezulu adingekayo ukumbozwa kwempuphu yokushisa yendabuko (imvamisa i-400 ° F / 200 ° C).
Inzuzo ye-UV Powder
Ukumbozwa okujwayelekile kwe-powder kubhubhisa ifilimu yepulasitiki. I-UV ephulukisiwe powder coating ishintsha umdlalo:
- Isigaba Sokuncibilika: I-powder isetshenziswa nge-electrostatically futhi incibilikiswa emazingeni okushisa aphansi (100 ° C - 130 ° C) isikhathi esifushane, okwanele ukugeleza kwifilimu ebushelelezi.
- Isigaba Sokwelapha: Ingxenye ihamba ngaphansi kwesibani se-UV LED. Ukwelashwa kwenzeka ngemizuzwana.
Lokhu kungukuguquka kwezimboni ezifuna ukuqina kwejazi lempuphu ezintweni ezizwela ukushisa njenge-MDF noma amashidi epulasitiki asindayo.
Ufuna ukwazi ngalolu hlelo lokusebenza olukhethekile? Funda kabanzi ku- Can UV LED Cure Powder Coating?
UV LED Curing for UV Varnish: How It Works
Ukuphulukiswa kwe-UV LED kwe-varnish kuhilela ukufaka ungqimba olucacile, oluvikelayo olwuketshezi phezu kombhalo ophrintiwe noma ihluzo bese uyiveza ekukhanyeni kwe-UV LED ukudala ukuqedwa okusheshayo, okucwebezelayo noma okusheshayo. Le nqubo isetshenziswa kabanzi ekunyatheliseni ilebula lewebhu elincane nokupakisha okuguquguqukayo ukuvikela ama-inks kusuka ku-abrasion, umswakama, namakhemikhali ngenkathi ungeza isikhalazo seshalofu.
Optimizing Varnish Curing
Ama-varnishes avame ukujiyila kunezingqimba zeyinki, okuletha inselelo "yokuphulukisa" (ukuphulukisa yonke indlela eya phansi).
- Ukungena kwe-Wavelength: Ama-wavelengths amade afana ne-395nm angena ngokujulile ezingqimbeni ze-varnish ezijiyile kunama-wavelengths amafushane (njenge-365nm), ukuqinisekisa ukunamathela okuhle kwifilimu eyisisekelo.
- Izinkinga Zokuphulukisa Ubuso: Kwesinye isikhathi, i-395nm ingena kakhulu futhi ayiphuluki indawo ephezulu kakhulu, iyishiye inamathele.
- Isixazululo se-Hybrid: Imigqa eminingi ethuthukile isebenzisa inhlanganisela yama-arrays e-LED (isb., Ibha ye-365nm yokubekwa uphawu komhlaba kanye nebha ye-395nm yokunamathela okujulile) noma izithasiselo ezikhethekile ku-varnish ukuqinisekisa indawo enzima, eyomile.
Ukuze uthole imininingwane enemininingwane yezobuchwepheshe kuzicelo ze-varnish, hlola UV LED Curing for UV Varnish: Isebenza Kanjani
Key Implementation Tips for Your Production
LineUkuhlanganisa i-UV LED kulayini wakho wefilimu kudinga ukunakwa kwemininingwane. Nawa amathiphu ochwepheshe ukuze uqinisekise ukuthi uthola kahle okokuqala.
Phatha indawo ethi "Oxygen Inhibition"
Njengoba sekushiwo, i-oksijini isitha sokwelashwa komhlaba. Uma ifilimu yakho izwa i-tacky naphezu kwezilungiselelo zamandla aphezulu, kungenzeka ukuthi uhlushwa ukuvinjelwa kwe-oksijini.
- Isixazululo: Khulisa ukuhlushwa kwe-photoinitiator ekugqokeni kwakho noma usebenzise uhlelo lwengubo ye-nitrogen ukuhlanza umoya-mpilo endaweni yokuphulukisa.
lawula ibanga
I-UV LED irradiance yehla ngokushesha phezu kwebanga.
- Umthetho wesithupha: Gcina ikhanda lesibani ngaphakathi kwe-2mm kuya ku-10mm ebusweni befilimu. Uma iwebhu iqhuma, yiqinise nge-roller; Ungamane uhambise isibani kude, ngaphandle kwalokho uzolahlekelwa amandla okuphulukisa.
Monitor Thermal
ManagementYize ama-LED "epholile," ukusabela kwamakhemikhali kokuphulukisa kuyi-exothermic (kudala ukushisa).
- Ithiphu: Kumafilimu amancane kakhulu (ngaphansi kwama-microns ayi-12), qiniseka ukuthi une-roller esekelayo ebandayo ukumunca ukushisa okukhiqizwa ukusabela kwe-polymerization uqobo, noma ngabe isibani singakhiphi ukushisa kwe-IR.
Optimize Line Speed
Ungagcini nje ukucindezela isibani ku-100% futhi ulindele okuhle kakhulu.
- Icebiso: Yenza "isifundo sesitebhisi." Gijima umugqa ngesivinini esihlukile namazinga amandla ukuze uthole "iwindi lokwelapha"—uhla lapho ukumbozwa kuphulukiswa ngokuphelele kodwa amandla awachithwa. Ungase ubone ukuthi amandla aphansi anele, okwandisa impilo yomshini wakho.
Isiphetho
Ukwazi ukuthi ungaphulukisa kanjani ukumbozwa kwifilimu yepulasitiki nge-UV LED kumayelana nokusebenzisa ukunemba kokukhanya okuncane ukucubungula izinto ezazingakwazi ukwelapha i-thermally. Ngokususa ukushisa kwe-infrared, uvula ikhono lokusebenzisa amafilimu amancane, ashibhile, futhi asimeme ngenkathi unciphisa amandla wefektri yakho.
Noma ngabe usebenzisa i-varnish elula yokuzivikela noma ijazi elinzima elisebenzayo eliyinkimbinkimbi, izihluthulelo zempumelelo ukulungiswa komhlaba, i-chemistry efanele yokwakhiwa, nokuhlanganiswa kwesibani esiqondile.
Ukulungele ukuthuthukisa amakhono akho okukhiqiza? Hlola uhla oluphelele lwezixazululo nezinsizakusebenza zobuchwepheshe ezijulile ku- UV LED Curing for Coatings.
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