Yini ebangela ukwelashwa okungaphelele ku-UV coatings (nokuthi ungayilungisa kanjani)

Imbangela evame kakhulu yendawo enamathelayo ukuvinjelwa kwe-oksijini. I-oksijini emoyeni iphendula ngama-radicals wamahhala ekugqokeni, imise inqubo yokuphulukisa ungqimba oluphezulu kakhulu. Ezinye izimbangela zifaka ukuqina okunganele kwe-UV, ukufanisa okungalungile kwe-wavelength, noma izingqimba zokumboza ngokweqile ezivimbela ukungena kokukhanya.

Isayensi ye "Tackiness" vs. "Ngokusebenzisa ukwelashwa"

Eminyakeni yami yokuxazulula imigqa yokuphulukisa yezimboni, ngivame ukubona opharetha bedida "i-surface tack" nge "under-cure." Lezi yizindaba ezihlukile.

• I-Surface Tack (i-Oxygen Inhibition): Ukumbozwa kuqinile ngaphansi kepha kunamathele phezulu. Lokhu kwenzeka ngoba ama-molecule e-oksijini acima ama-radicals wamahhala akhiqizwa yi-photoinitiators yakho. Lokhu kuvame kakhulu ngemithombo ephansi ye-UV LED uma ukwakheka kungalungiswa.
• Ukwelashwa okungaphelele: Ukumbozwa komile phezulu kepha kuthambile noma ku-delaminating phansi. Lokhu kuvame ukusho ukuthi ukukhanya kwe-UV akuzange kungene ngokujulile ngokwanele, imvamisa ngenxa yokulayishwa okuphezulu kwe-pigment (njengama-inki amhlophe) noma ukushuba kokumboza okudlula amandla okungena kwesibani.

Ithiphu Yochwepheshe: Yenza isivivinyo se- "thumb twist". Uma i-mars mars kodwa ingahlukani, ukuvinjelwa komhlaba. Uma ukumbozwa kushelela ku-substrate, unokwehluleka kokuphulukiswa noma ukunamathela.

Ingabe ukungalingani kwe-wavelength kubangela ukwehluleka kokwelapha?

Yebo, ukungalingani kwe-wavelength kuyiphuzu elibucayi lokwehluleka. Ukukhishwa kwesibani sakho se-UV kufanele kuhambisane nesiqongo sokumuncwa kwe-photoinitiator. Uma ukumbozwa kwakho kudinga amandla angama-365nm kepha isibani sakho se-LED sikhipha i-395nm kuphela, ukusabela ngeke kubangele kahle, okuholela ekwelapheni okubuthakathaka noma okungaphelele.

Ukufanisa umthombo wakho wokukhanya kumakhemikhali

Ukushintsha kusuka kumalambu e-mercury arc kuya ku-UV LED kuvame ukuveza le nkinga. Izibani zeMercury zikhipha i-spectrum ebanzi, "zishaya" cishe noma iyiphi i-photoinitiator. Ama-LED e-UV angama-monochromatic (ibhendi elincane).

Uma usebenzisa ukwakheka okuklanyelwe isibani se-mercury ku- UV LED Coating Curing umugqa, kungahle kwehluleke ngoba i-LED ayinawo amandla amafushane e-UV-C adingekayo ekuphulukisweni komhlaba.

Isixazululo:

• Shintsha ama-photoinitiators: Sebenzisa ukwakheka okuhlanganiswe nama-PI amunca ngokuqinile ku-385nm noma ku-395nm.
• Hlanganisa ama-wavelengths: Amanye ama-LED arrays athuthukile axuba ama-wavelengths ukukhomba izingqimba eziningi zokujula.

Ngiyivimbela kanjani izindawo ze-tacky ku-UV varnish?

Ukuze ulungise i-tacky UV varnish, kufanele unqobe ukuvinjelwa kwe-oksijini. Ungakhuphula i-UV irradiance (ukuqina) ukuze "udlule" ukusabela kwe-oksijini, usebenzise imvelo ye-nitrogen inerting ukususa umoya-mpilo, noma ushintshele ku-varnish eyakhelwe ngokukhethekile ukwelashwa kwe-LED nge-amine synergists.

Amasu okuqeda okuphelele okuphezulu okuphezulu

I-Varnishes ayithetheleleli ngokukhethekile. Ngenxa yokuthi zicacile futhi zivame ukusetshenziswa kancane, ukukhubazeka komhlaba kusobala. Ngokuhlangenwe nakho kwami, ukumane wehlise umugqa akuyona impendulo ngaso sonke isikhathi—kwesinye isikhathi kwenza izinto zibe zimbi kakhulu ngokuvumela isikhathi esengeziwe se-oksijini ukusebenzisana nendawo.

Izinyathelo Ezisebenzayo:

1. Ukwandisa i-Peak Irradiance: Ukuqina okuphezulu (kulinganiswe ku-W / cm²) kukhiqiza ukuqhuma okukhulu kwama-radicals wamahhala adla umoya-mpilo ngokushesha kunalokho angasakazeka emuva ekugqokeni.
2. Hlola i-Reflector / Lens yakho: Ama-optics angcolile anganciphisa amandla anikezwayo ngo-30% noma ngaphezulu. Zihlanze masonto onke.
3. Thuthukisa i-LED: Funda kabanzi mayelana nokuthi UV LED Curing for UV Varnish ibhekana ngokuqondile nokwelashwa komhlaba ngokukhishwa okuphezulu.

Ingabe amafilimu epulasitiki azwela ukushisa angaphulukiswa ngokuphelele?

Yebo, amafilimu epulasitiki angalapheka ngaphandle kokulimala kusetshenziswa ubuchwepheshe be-UV LED. Ngokungafani nezibani ze-mercury ezishisayo, ama-LED akhipha ukushisa okuncane kwe-infrared ("ukuphulukiswa okubandayo"). Kodwa-ke, kufanele uqinisekise ukuthi ukumbozwa kunamathela kahle kumapulasitiki anamandla aphansi ngokubheka ukungezwani komhlaba futhi kungenzeka usebenzise ukwelashwa kwe-corona ngaphambi kokumboza.

Managing Thermal Load on Thin Substrates

Enye yezinselelo ezinzima kakhulu embonini ukuphulukisa ukumbozwa okuqinile ku-substrate ebuthakathaka efana ne-shrink wrap noma i-PET encane. Izibani zendabuko zigoqa lezi zinto.

Uma uphulukisa Coatings on Plastic Film nge UV LED, uqeda IR ukushisa spike. Kodwa-ke, wethula ukuguquguquka okusha - ukunamathela.

• Inselele: Ama-LED awashisi i-substrate, kwesinye isikhathi angasiza "ukumanzisa" ukunamathela.
• The Fix: Qinisekisa ukuthi substrate yakho ebusweni amandla (Dyne ezingeni Dyne) okungenani 10 dynes ephakeme kuka ukungezwani ebusweni yakho enamathela.

Kungenzeka yini ukwelapha i-powder enamathela nge-UV LED?

Yebo, ukumbozwa kwe-powder okuphulukisiwe kwe-UV kuyisicelo esikhulayo, kepha kudinga inqubo yezinyathelo ezimbili: okokuqala, i-powder iyancibilika (nge-IR noma i-convection), bese iphulukiswa ngokushesha ngokukhanya kwe-UV. Lokhu kuhlukanisa isigaba sokugeleza esigabeni sokwelashwa, okuvumela amazinga okushisa aphansi nokucubungula okusheshayo.

The Revolution in Heat-Sensitive Substrates

Abantu abaningi bayabuza: Can UV LED Cure Powder Coating? Impendulo inguyebo, futhi ishintsha umdlalo wezinto ezifana nokhuni (MDF), ipulasitiki, nezinto ezihlanganisiwe ngaphambilini ezingakwazi ukusinda kuhhavini we-400 ° F (200 ° C).

Umehluko oyisihluthulelo:

• I-Thermal Powder Enamathela: Idinga ukushisa okuphezulu imizuzu engama-20 + ukuxhumana.
• I-UV Powder Coating: Iyancibilika ekushiseni okuphansi (~ 110 ° C) imizuzu eyi-1-2, bese iphulukisa ngemizuzwana ngaphansi kwe-UV LED.
• Inzuzo: Lokhu kunciphisa kakhulu ukusetshenziswa kwamandla kanye ne-footprint yomzimba yomugqa wakho wokukhiqiza.

Comprehensive Troubleshooting Checklist

Uma ubhekene nokwelashwa okungaphelele, sebenzisa lolu hlu lokuhlola ngaphambi kokubiza umphakeli wakho wamakhemikhali.

1. Hlola ukuphakama kwesibani: Ingabe isibani >10mm kude ne-substrate? Ukuqina kwe-UV kwehla ngokufanele ngesikwele sebanga. Yisondeze eduze (i-5-10mm ivame ukulungeleka kuma-LED).
2. Qinisekisa ukukhanya: Sebenzisa i-radiometer. Ungaqageli. Amehlo akho awakwazi ukwahlulela ukuqina kwe-UV.
   • Umgomo: Qinisekisa ukuthi ushaya i-mJ / cm² ethile (umthamo) ne-W / cm² (ukuqina) okudingekayo yi-Technical Data Sheet (TDS) ye-coating.
3. Hlola i-Shadows: Ezingxenyeni ze-3D, ingabe zikhona izindawo ukukhanya okungashayi ngqo? Ukwelashwa kwe-UV kungumugqa wokubona.
4. Buyekeza Impilo Yeshalalofu: Ingabe ukumbozwa kwakho kuphelelwe yisikhathi? Ama-photoinitiators angawohloka ngokuhamba kwesikhathi noma uma egcinwe ngokungafanele.
5. Hlaziya ijubane: Ingabe othile ukhuphule ijubane lokuhambisa ngaphandle kokwandisa amandla esibani?
   • Umthetho wesithupha: Uma uphinda kabili ijubane, unciphisa umthamo wamandla ngesigamu.

Uchwepheshe: "Ngike ngaxazulula 'iqoqo elibi' lesikhalazo sokumboza ngokusula iwindi le-quartz lesibani se-UV ngotshwala be-isopropyl. Yayimbozwe yinkungu enhle ye-overspray evimbela u-40% wamandla.

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Imicabango Yokugcina Ekuthuthukiseni Ukwelashwa Kwakho

Ukwelashwa okungaphelele akuvamile ukuba yimfihlakalo; kungukungalingani phakathi kwe-physics (amandla okukhanya) kanye namakhemikhali (ukwakheka kokumboza). Ngokushintshela ezinhlelweni zanamuhla ze-UV LED nokulawula ngokuqinile ukuguquguquka kwenqubo yakho-ibanga, ubude be-wave, nokuchayeka kwe-oksijini-ungafinyelela ukuqedwa okungaguquguquki, okuhlala isikhathi eside, futhi okusezingeni eliphakeme ngaso sonke isikhathi.

Ukuze uthole imihlahlandlela eningiliziwe ngezinhlelo zokusebenza ezithile, hlola izinsiza zethu ku UV LED Curing for Coatings kanye nokusetha okukhethekile.