Printing on film-based self-adhesive materials can present challenges, and ink bleed is a common problem encountered by print manufacturers. Ink drop refers to the poor firmness of the printed ink layer on the surface of the material due to factors such as low surface tension, insufficient UV curing, and excessive ink additives. Severe printing ink loss not only affects product quality, but even leads to scrapping of batches of products. ʻI he fakamatala ko ʻeni, we will explore the top three causes of ink bleed on printed film self-adhesive materials and provide effective solutions to overcome this problem.
1. Low surface tension of film materials
Ko e taha 'o e ngaahi 'uhinga tefito 'o e ngaahi mata'itofe 'o e vaitohi 'i he ngaahi naunau 'oku makatu'unga 'i he filimi 'oku paaki 'a e self-adhesive ko e funga ma'ulalo 'o e filimi .. 'I he angamaheni, ko e ma'olunga ange ia 'a e funga 'o e 'atakai ., ko e lelei ange ia ʻa e vave ʻo e vaitohi hili hono pulusí .. 'Oku 'ikai ha palopalema 'i he funga 'o e lahi taha 'o e ngaahi naunau hange ko e pepa ., ka ko e funga 'o e ngaahi naunau hange ko e filimi 'oku fa'a ta'efakatatau .. 'E lava ke taki 'e he funga ma'ulalo ko 'eni ki he kovi 'o e vaitohi ., 'a ia 'e lava ke ne taki atu ki he fakasi'isi'i 'o e droplet 'o e vaitohi mo e tu'unga lelei 'o e paaki .. Kapau 'oku 'i ai ha mole 'o e vaitohi lolotonga 'a e founga pulusi ., 'e lava ke ke faka'aonga'i ha peni dyne ke sivi'i 'a e mahu'inga 'o e funga 'o e 'ea 'o e naunau .. 'I he angamaheni, ngaahi naunau 'oku ma'ulalo ange 'i he funga 'o e 'ea 'i he . 38 datones 'oku faingofua ki he mole 'a e vaitohi .. Ke fakalelei'i e kaveinga ni ., fakakaukauʻi ange ʻa e ngaahi fakaleleiʻanga ko ʻení .:
HA. Faito'o 'i 'olunga: fakahoko 'a e founga faito'o 'o e funga ke fakalahi 'a e funga 'o e naunau 'o e filimi .. 'E lava ke a'usia 'eni 'e he faito'o corona ., faito'o ulo pe faito'o 'o e plasma ., 'a ia 'e lava ke ne liliu 'a e ngaahi 'ulungaanga 'o e funga ., fakalahi 'a e wettability mo poupou'i 'a e adhesion 'o e vaitohi ..
B. Primer kote: Faka'aonga'i ha kote primer fe'unga ki he naunau 'o e filimi kimu'a pea toki paaki .. 'Oku tokoni 'a e ngaahi primers ke fa'u ha fehokotaki'anga 'i he vaha'a 'o e vaitohi mo e funga 'o e naunau ., fakalelei'i 'a e adhesion 'o e vaitohi mo fakasi'isi'i 'a e faingamalie 'o e ink dripping .. Fetu'utaki ki ho'o kautaha 'o e 'ufi'ufi ke fili ha primer fe'unga 'oku fe'unga mo e naunau 'o e filimi mo e ink formulation .. Ko e ngaahi kautaha paaki fakapalofesinale 'e ni'ihi 'o e ngaahi faka'ilonga 'e toe faka'aonga'i fakahangatonu 'a e ngaahi naunau 'oku 'ufi'ufi 'e he PET self-adhesive ki he pulusi .. 'Oku liliu 'e he coating 'a e ngaahi 'ulungaanga 'o e wetting 'o e funga 'o e ngaahi naunau 'o e PET self-adhesive ., pea 'oku tu'uma'u 'a e fakahoko ., pea 'e lava ke fakalelei'i lelei 'a e fefeka 'o e layer 'o e vaitohi ..
2. Fakamo'ui UV 'ikai fe'unga
'E toe taki 'e he 'ikai fe'unga 'a e UV 'a e ngaahi mata'itofe 'i he taimi 'oku paaki ai 'a e ngaahi naunau 'o e filimi-fa'ahinga 'o e tokotaha .. 'E iku 'a e fakamo'ui 'oku 'ikai kakato ki ha la'i vaitohi 'oku 'ikai ke ne a'usia 'a e fefeka lelei taha mo e pipiki ., ‘oku iku ia ki he kovi ‘a e ngingilá mo e vave .. Ko e fakamo‘ui ta‘ekakato ‘oku ‘uhinga iá kuo fakamāfana‘i mo fakamo‘ui ‘a e la‘i funga ‘o e vaitohi paaki ., ka 'oku 'ikai ke fakamo'ui kakato 'a e loto .. Ko e mole 'o e vaitohi 'oku fakatupu 'e he fa'ahinga tu'unga ko 'eni 'oku lahi taha 'i hono pulusi 'o e ngaahi sipinga 'o e feitu'u lalahi .. Koe'uhi he 'oku ngaue'aki 'e he ngaahi sipinga 'o e feitu'u lalahi ha lahi 'o e vaitohi ., pea ko e loto ‘o e la‘i vaitohi ‘oku ‘ikai ke fu‘u faingofua ke faito‘o faka‘aufuli .. Ke fakalelei'i e kaveinga ni ., 'e lava ke ke vakai ki he ngaahi fakalelei'anga ko 'eni .:
HA. UV Intensity mo e Tu'unga .: Make sure the UV curing system is properly calibrated and delivering adequate UV intensity and dosage. Monitor and adjust UV intensity levels to achieve optimal curing for the specific ink and film material being used. For example, darker patterns absorb more UV light and often require more power to dry completely. Consult ink and equipment manufacturers for recommended UV curing parameters.
B. Curing time and temperature: optimize the curing time and temperature settings to ensure sufficient exposure and ensure that the ink layer is fully cured. Consult the ink manufacturer’s guidelines for recommended curing parameters and adjust accordingly for the printing conditions and equipment used.
C. Service life of UV lamps: ʻI he lolotongá ni, the service life of UV lamps on toppan printing equipment is between 800 and 1000 houa. Kapau 'oku te'eki ke fetongi 'a e ngaahi maama 'i he taimi 'oku lahi ange ai 'a e mo'ui 'oku fakafuofua'i ., 'oku faingofua ke fakatupu 'a e vaitohi ke momoko .. Ko ia ai, 'i he taimi 'oku fetongi ai 'a e paipa maama UV ., ʻoku fie maʻu ke fai ha ngaahi lekooti fakaikiiki ., pea 'i he taimi 'oku a'u ai 'a e paipa maama UV ki he mo'ui 'o e ngaue ., kuo pau ke fetongi ia ʻi he taimí ..
3. Ngaahi me'a fakalahi 'o e vaitohi .
'E fakatupu 'e he 'i ai 'a e ngaahi me'a 'oku fu'u lahi 'a e ink 'a e ngaahi mata'itofe 'i he taimi 'oku paaki ai 'a e ngaahi naunau 'o e filimi-fa'ahinga 'o e tokotaha .. ʻI he founga pulusí ., ʻoku faʻa fetaulaki ʻa e vaitohi paaki mo e ngaahi palopalema ʻo e matolu ., viscosity ma'olunga mo e inking kovi .. Ko ia ai, 'e fili 'a e kau fakalele tokolahi ke tanaki atu 'a e varnish ke fakalelei'i 'a e fluidity 'o e paaki .. Ka neongo ia, kapau 'oku ngaue'aki ta'etotonu 'a e lahi 'o e varnish ., 'oku faingofua 'aupito ke uesia 'a e viscosity 'o e vaitohi ., funga 'o e 'atakai mo e fakahoko 'o e adhesion ., iku'anga 'o e 'ikai ke 'i ai ha vai 'i he vaitohi .. Kataki 'o fakakaukau'i 'a e ngaahi solova'anga ko 'eni ke fakalelei'i 'aki 'a e kaveinga ko 'eni .:
HA. Ngaahi Founga ʻo e Ink: Toe vakai'i mo fakalelei'i 'a e ngaahi founga 'o e vaitohi 'aki 'a e taumu'a ke fakasi'isi'i 'a hono ngaue'aki 'o e additive .. Koe'uhi 'oku 'ikai lava ke fakafehoanaki haohaoa 'a e ngaahi naunau kotoa pe mo e ngaahi vaitohi ., 'oku lelei taha ke ma'u 'a e vaitohi totonu 'aki 'a e ngaue vāofi mo e kautaha 'o e vaitohi ke fakatupulaki ha founga 'o e vaitohi angamaheni 'oku ne fakapalanisi 'a e ngaahi koloa 'o e vaitohi mo fakasi'isi'i 'a e fakatu'utamaki 'o e ngaahi mata'i 'o e vaitohi ..
B. Sivi 'o e fe'unga: 'Oatu 'a e naunau ki he kautaha 'o e vaitohi ki he sivi ke fakapapau'i 'oku fe'unga 'a e ink additive 'oku faka'aonga'i mo e naunau 'o e filimi mo e founga pulusi .. 'Oku fakahoko 'a e sivi 'o e fe'unga 'i he vaha'a 'o e vaitohi mo e ngaahi naunau 'o e filimi ke fakapapau'i ha ngaahi fetu'utaki pe ngaahi ta'efe'unga 'e lava ke ne fakatupu 'a e ngaahi mata'itofe .. Test different ink formulations and adjust additive levels to find the best combination that provides good adhesion while minimizing ink dripping.
Fakaʻosinga
Overcoming the challenges of ink droplet printing in film-based self-adhesive materials requires a multifaceted approach. By addressing the causes of low surface tension, insufficient UV curing and excess ink additives, printers can significantly improve ink adhesion and achieve better print quality. Implement surface treatments or primer coats to enhance surface tension, optimize UV curing parameters to achieve full ink cure, and fine-tune ink formulations to minimize the use of excess additives. By adopting these solutions, manufacturers can overcome ink drop challenges and produce high-quality prints on film-based self-adhesive materials.
