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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