Cov teeb meem qhuav qhuav ntawm dej-Raws li Screen Printing Inks

Common Drying Problems Of Water-Based Screen Printing Inks

Dej-raws li kev tshuaj ntsuam luam ntawv inks siv dej deionized ua qhov nruab nrab dispersion, nrog acrylic resin los yog polyurethane resin ua zaj duab xis- tsim cov khoom, thiab cov xim sib xws, defoamers, pH adjusters, thiab co-solvents. Lub tshuab ziab khaub ncaws ua haujlwm ntawm ob lub tshuab:volatile qhuavraws li cov txheej txheem tseem ceeb thiabreactive coagulation ziabraws li cov txheej txheem pabcuam.

Lub tshuab ziab khaub ncaws tsis hloov pauv dej thiab qis -boiling co- cov kuab tshuaj los ntawm cov kua nplaum sab hauv mus rau saum npoo ntawm molecular diffusion, ces tshem tawm los ntawm huab cua convection. Reactive coagulation drying triggers cross-txuas ntawm resin molecules tom qab dej volatilization, tsim ib tug nruam thiab tuab zaj duab xis.

Cov txheej txheem no sib txawv ntawm cov kuab tshuaj -raws li inks. Cov kuab tshuaj-raws li inks cia siab rau ceev ceev volatilization ntawm cov organic solvents, thaum dej-raws li inks yuav tsum tau tswj huab cua khiav thiab nruab nrab kub kom tiav cov dej tshem tawm. Tsis yog -absorbent substrates xws li PE, PP, aluminium foil, thiab PET tsis muaj capillary nqus dej, yog li tag nrho cov ya raws yuav tsum tau muab tshem tawm los ntawm huab cua convection.

Qhov kev ua tsis tiav no tshwm sim thaum cov dej seem hauv cov yeeb yaj kiab number case ntau dua 3%, uas ua rau cov tack thiab txheej sib cais tom qab rewinding.Ib yam ntawm - qhov kev ua tau zoo ntawm qhov chaw muaj xws li nto tack tom qab luam ntawv, hloov tus number case thaum lub sij hawm overprinting, qauv tev tawm tom qab rewinding, thiab ua tsis tiav 3M daim kab xev adhesion xeem.

Lub hauv paus ua rau muaj ntau thiab pom tau:
1. Ink zaj duab xis thickness tshaj 12μm, tshwm sim los ntawm cov kab tsis tshua muaj suav anilox rollers, sib sib zog nqus engraving qhov tob, los yog siab txheej hnyav.
2. Qhuav cua tshaj tawm yog qis dua 2.5m / s, ua rau kom ya raws qeeb.
3. Substrate nto nro yog qis dua 38mN / m, txo tus number case wetting thiab kis ceev.
4. Ambient txheeb ze av noo tshaj 65%, ua rau dej vapor ib nrab siab thiab slowing diffusion.
5. tus nqi pH poob qis dua 8.0, ua kom tus number case viscosity nce siab tshaj 25s, txo qis ntws thiab diffusion tus nqi.

This failure forms a dense resin film on the surface within 3–5 seconds, sealing residual water inside the ink layer.Typical performance includes dry surface touch, foaming and wrinkling during overprinting, and reduced adhesion after full curing.

Hauv paus ua rau tsom rau qhov tsis sib haum xeeb:
1. Qhuav kub tshaj 60 degree, tsim nto zaj duab xis ua ntej inner diffusion.
2. Huab cua ntws yog concentrated nyob rau saum npoo yam tsis muaj kev nkag mus, tsis ua kom tshem tawm sab hauv cov dej noo.
3. Ib zaug-theem siab- kub ziab hloov segmented ziab, tsis ua ntej- ziab tsis.

Lub hauv paus ua rau muaj feem cuam tshuam nrog cov cuab yeej layout thiab txheej txheem tsis:
1. Qhuav cua ntws ncaj qha tshuab lub vijtsam phaj, txo tus number case nyob rau hauv qab 2 vib nas this.
2. Kev luam ntawv ceev yog qis dua 15m / min, nthuav tawm tus cwj mem raug rau ntawm qhov screen.
3. pH tus nqi siab tshaj 9.5, txo cov xim concentration thiab ua kom cov dej volatilization.
4. Siab- shear stirring los yog ceev ceev rov qab cuam tshuam cov kua theem, tsim npuas uas ua rau kom qhuav.

Qhov kev ua tsis tiav no cuam tshuam rau qhov zoo li thiab qhov sib xws, feem ntau tshwm sim hauv qhov chaw siab -cov av noo. Cov kev ua tau zoo xws li cov xim sib txawv hauv zos, pos huab dawb ntawm qhov chaw, cov pinholes tuab, thiab txo qhov ci.

Cov hauv paus hauv paus yog txuas rau ib puag ncig, substrate thiab number case system:
1. Ambient humidity tshaj 70%, dej vapor condenses mus rau hauv tus cwj mem zaj duab xis thaum hnyav volatilization kub nqus.
2. Substrate nto muaj roj los yog tso tawm tus neeg sawv cev, kev sib cuag lub kaum sab xis tshaj 50 degree, ua rau wetting tsis xws luag.
3. Kev nplawm ntau dhau ua rau huab cua npuas, tawm hauv pinholes tom qab tawg.

Hauv paus ua rau tsom rau kev kho substrate thiab kho kom tiav:
1. Substrate tsis muaj corona los yog nplaim taws kho, nto nro hauv qab 38mN / m.
2. Resin cross- txuas tsis tiav, nrog lub sijhawm kho tsawg dua 24h ntawm 25℃.
3. Kev sib xyaw nrog cawv-raws li lossis cov kuab tshuaj-raws li inks rhuav tshem cov txheej txheem emulsion thiab zaj duab xis- tsim qauv.

Txo cov ziab ziab los ntawm qhov chaw los ntawm kev tswj tus number case zaj duab xis thickness:
1. Xaiv anilox rollers nrog kab suav saum toj 120LPI, engraving qhov tob tswj ntawm 18-22μm rau cov phaj ntiav ntiav.
2. Txais ntau- txheej nyias luam ntawv, ib tus cwj mem zaj duab xis thickness tswj hauv qab 10μm.
3. Match screen mesh suav: cov qauv zoo siv 300–420 mesh cov ntxaij vab tshaus kom txo tau ib tus number case loading.

Hloov ib zaug -theem siab- kub ziab nrog ob-theem segmented ziab:
1. Thawj theem: kub 40–45 degree, huab cua tshaj tawm 1.0–1.5m/s, ua ntej- qhuav nto kom tsis txhob muaj cov zaj duab xis sai.
2. Qhov thib ob theem: kub 50-60 degree, huab cua tshaj tawm 3.0-4.0m / s, siab convection kom tshem tawm cov seem seem.
3. Khaws cov cua qhuav kom deb ntawm lub npov npo, tsuas yog tshuab rau ntawm cov ntawv sau substrate kom tsis txhob ziab ntxov ntxov.

Txhim kho tus cwj mem ruaj khov nrog kev saib xyuas lub sijhawm tiag tiag:
1. Tswj pH tus nqi ruaj khov ntawm 8.5–9.5, siv cov dej tshwj xeeb -raws li pH adjusters rau kev kho.
2. Tswj viscosity ntawm 15-22s, tsis txhob muaj dej ntau ntxiv kom tswj tau emulsion stability.
3. Tshawb xyuas txhua 30 feeb thaum lub sijhawm ua haujlwm tas mus li, kaw thiab kho qhov ntsuas kom tsis txhob hloov pauv.

Failure Phenomenon	Yam Khoom Ua Ntej	Nyob rau -Site Rapid Treatment
Tsis txaus ziab thiab adhesion	Ink zaj duab xis thickness, humidity, huab cua ntim	Txo cov txheej hnyav, nce cua tshaj tawm, pib dehumidifier
False drying thiab re-adhesion	Tshaj kub, huab cua tsis txaus	Tsawg kub, ntxiv dag zog rau convection, txuas ntxiv thib ob -theem ziab
Screen thaiv thiab stringing	Cua tshuab rau kev tshuaj ntsuam, tsis tshua muaj luam ntawv ceev	Kho cov pa duct, nce ceev kom siab dua 15m / min, ntxiv qeeb - tso tawm tus neeg sawv cev
Blushing thiab fogging	Ambient humidity, dej hauv diluent	Dehumidify, siv dej-raws li tshwj xeeb diluent, kho tus nqi ziab
Pinholes thiab npuas	Substrate ntxuav, defoaming, stirring	Degrease substrate, ntxiv defoamer, txo stirring ceev
Tsis zoo adhesion	Kev kho substrate, ziab degree	Txhim kho kev kho mob corona, ncua sijhawm kho rau 24 teev

Cov teeb meem ziab ntawm cov dej-raws li kev tshuaj ntsuam luam ntawv inks yog cov txheej txheem engineering ntsig txog kev ua phaj, cov cwj mem tsis, cov khoom siv ziab, ib puag ncig thiab substrate. Kev ruaj khov loj ntau lawm yuav tsum muaj kev tswj hwm tus qauv:

1. Txais ob-theem ziab nrog qhov nruab nrab kub thiab huab cua siab, zam ib zaug -theem siab- kub kub.
2. Khaws pH ntawm 8.5–9.5 thiab viscosity ntawm 15–22s, kho nrog cov tshuaj ntxiv tshwj xeeb.
3. Tswj ambient humidity ntawm 40-60%, optimize cua duct kom tsis txhob ncaj qha tshuab ntawm lub phaj phaj.
4. Siv siab -kab- suav cov anilox chais ntiav, kho cov uas tsis yog-absorbent substrates los txhim kho kev ntub dej thiab ziab kom qhuav.
5. Ua kom tus number case system ywj siab, txwv tsis pub sib xyaw nrog lwm hom number case, khaws cia ntawm qhov kub siab tshaj 5 degree.

Kev ua raws li cov kev ntsuas saum toj no tuaj yeem txo qis qis qis qis qis qis dua 1%, txhim kho kev luam ntawv zoo, thiab txhawb kev siv dej -raws li inks hauv ntim khoom noj, cov khoom siv tshuaj niaj hnub, cov ntawv sau thiab lwm yam.

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