CombiWhiteCombiWhiteEasily overprintable Opaque WhiteUV Screen ink

Easily overprintable Opaque WhiteUV Screen ink

Combination printingCombination printing

Why is it difficult to over print UV screen with UV flexo?

– UV flexo is ”kiss” printing method

– UV screen inks often containsilicones and flow agents

How does it show?

– Low density of the UV flexo printedon top of UV screen ink

– Pin holing, fish-eyes

– Bad adhesion of the UV flexo ink

Top layer shows excellent over printability with inks and VIP.

Printed with CombiWhite & UV flexo

Lower layer show poor trapping over ”normal” UV screen ink

Combination printingCombination printing

Screen 305/13%, Anilox 1000 lpi, 1.2 bcmDensityDensity

0,5

0,7

0,9

1,1

1,3

1,5

1,7

White PE old screen white

UFG50080

Combination printingDensity of UV flexo over screen whitesCombination printingDensity of UV flexo over screen whites

Combination printingThe previous way!Combination printingThe previous way!

How do we overcome bad over printability over UV screen inks?

– Add silicones to the printing ink that over prints

How does this effect the print result?

– Higher dot gain on the ink that is over printing

– Difficult to keep negative text open

– Giving problems to hot foil or Thermal Transfer print on top of the over printing ink

– Must add the additive to all inks in the combination!

0,5

0,7

0,9

1,1

1,3

1,5

1,7

White PE USC90091 USC90091+SI inUFG

USW90001

UFG50080

Screen 305/13%, Anilox 1000 l/in 1.2 bcmDensityDensity

Combination printingDensity of UV flexo over screen whites

Combination printingDensity of UV flexo over screen whites

Higher density over CombiWhite then PE

CombiWhiteCombiWhite

Advantages with CombiWhite

– Easily over printable Opaque White UV screen ink!

– Improved UV flexo ink transfer

– Higher density on top of the UV screen ink than on the substrate

– Even better ink film on the over printed UV ink

– The UV screen ink has same properties as a ”normal” UV screen ink

Uvoscreen II CombiWhiteDensity over printabilityUvoscreen II CombiWhiteDensity over printability

1

1.2

1.4

1.6

1.8

2

2.2

White PE Normal UVscreen

USW90002

Screen 305/13%, Anilox 160 l/cm 6,5 cm³/m²

Den

sity

Den

sity

CombiWhiteUSW90002CombiWhiteUSW90002

Best over print performance in the market

Excellent over-printability

Print as sharp over CombiWhiteas on white PE

No additives needed to over print USW90002

The most opaque UV screen inks

Combination printingDemands on ”no label look” imageCombination printingDemands on ”no label look” image

Good printability (no pinholes , orange peel)

Sharp text & lines (positive & negative)

Opacity – (wish to replace white substrate)

Whiteness (no yellowing)

Good curing

Adhesion / resistance / Gloss

Easy to use & to overprint

Comparison in Combination Printingvs UV rotary Screen 13% mesh 40m/minComparison in Combination Printingvs UV rotary Screen 13% mesh 40m/min

BetterEqualWorseAdhesion

BetterEqualEqualCuring

Worse

Equal

Worse

Equal

Better

SB Gravure(theoretical)

80%75%Opacity

EqualWorseEasy to overprint with UV Flexo

EqualEqualWhiteness

Equal > 6pWorseText / lines

Slightly worseSlightly worsePrintability (pinholes)

UV FlexostdWB FlexoProperties