uvinktrainingflexo-español

8/7/2019 UVInkTrainingFlexo-espaol

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SEMINARIO SERICOL TINTAS UV

Carlos SnchezDirector de Flexotech Color

Sericol Technical Service


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AgendaPor qu UV?

La qumica del UVCurado de tintas UVLmparas UV

La tinta UV en las reas deproduccinSeguridad e Higiene


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Porque trabajar con tinta UV?Productividad

Disminucin en tiempo muerto Incremento en la produccin por galn de

tintaCalidad / Consistencia

Mejor reproduccin de punto Consistencia de color Incremento en el espesor de la pelcula de

tinta depositada

Mejores propiedades de resistenciaMedio Ambiente Reduccin en la emisin de solventes a la

atmosfera Mejora en las condiciones de trabajo Bajos o nulos niveles de VOCs


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Q uimica

Cmo trabajan las tintas UV ?


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Q uimica Tinta SolventeContiene 30-40%solidos

Seca por la evaporacindel solventeMezclas en formaexhaustiva

Solvent- ased Ink


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Q uimica Tinta UV

n nti nal UV Ink

100% S lid sN ap ra

ur s by cr ss linkingLa may ria d la tintaUV r qui r un p st

curadMix ink th r ughly


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How UV In s Cure


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How UV In s Cure

After Printing - Before Curing

After Curing

ReactiveOligomer

ReactiveMonomer

PhotoinitiatorPigment

Substrate

Substrate


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How Pigment Effects thePassage of UV Energy

UV Varnish/Extender base

UV Color

InLayer

InLayer

Substrate Substrate

Key:

Photoinitiator Pigment


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Effect of PigmentConcentration on Cure

No Pigment

Easy to cureHigh penetration of UV

High pigment concentrationDifficult to cureLowest penetration of U/V

Low pigment concentrationLess easy to cureLower penetration of UV

Pigment concentration and amount of UV radiation is identical in each case


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Effect of Different

Pigments on CurePigment transmitting UVEasy to curee.g. Magenta

Pigment reflecting UVMore difficult to curee.g. White

Pigment absorbing UVMost difficult to curee.g. Green

Pigment concentration and amount of UV radiation is identical in each case


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Effect of Color on Speed0 10 20 30 40 50 60 70 80 90 100

BLACK

GREEN

ORANGE

W H I T E

BLUEVIOLET

YELLOW (RED SHADE)

RED (BLUE SHAD E)

RED (YELLOW SHADE)YELLOW (GREEN SHADE)

EXTENDER BASE

MAGENTA


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Photoinitiators

Optimum level of photoinitiatorOptimum cure throughout

High level of photoinitiatorOnly top surface is able to cure


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In Deposits Effect on Cure

Fully Cu r d

Un d r Cu r dUnc u r d Un d r Cu r d

Fully Cu r d

Fully Cur d


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UV Lamps


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Medium Pressure

Mercury Arc LampMercury & Xenon

Electrode

Q uartz Tube

Essential features:Q uartz tubeVarious lengthsPartly filled with mercuryXenon as filling gas to start lamp

Operating Conditions:Temp 1100-1500 F (600-800 C)Life 1000-2000 hoursPower input 80-120 watts


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Reflector StructuresFaceted Parabolic / Elliptical


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Lamp OutputMillijoules (mJ/cm 2)Milliwatts (mW/cm 2)HeatVisible light

Lamp output is verified with aradiometer


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Lamp MaintenanceClean reflectors and bulbs

Wipe with alcohol Dont touch with fingers Schedule and stic with it !!

Rotate bulbs

180

at least once every two wee sReplace

Life of UV bulbs vary Average 1000-1500 hours


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UV In s in Production


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UV In s PrepressAnilox selection

Match in to anilox

Printing plate selection Manufacture Type

Artwor Process (Screen/flexo/combination) Line count


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UV In s - PressPress ready in s

Mix up in s thoroughly / scrape lids Only in department ma es adds to

in


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Health and Safety IssuesHealthier wor environmentS in contact

Wash off with SOAP and WATER Dont wash with thinners or chemicals Dont allow prolong s in exposure


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