Digital imaging training_2011 PrintLAT

DAVID PACHON – PRINTLATwww.PrintLat.com1

Digital Imaging

Inkjet Training


How does a printer How does a printer head work?head work?

Inkjet Imaging


The head methods

Thermal / Bubble Jet

Side-shooterFront-shoot

HPOlivettiLexmark

CanonXerox

Piezo Jet

SqueezeTube

Shearmode

Bender Pushmode

Continuous Flow method Drop on demand method

Inkjet Imaging


Thermal Inkjet - Bubble Jet - technology

HP Design Jet 5500 / Z6100 Canon W 6400 / 8400iPF6100 / 9000

Inkjet Imaging


Drop on demand method - Bubble Jet

Jet compartment heating element

Drop ejection

Non-operative condition

Bubble production

Collapsing bubble

Ejected droplet

Capillary topping-up

Inkjet Imaging


Inkjet Imaging - HP printhead


Piezo Jet - technologyMutoh RJ 6100

EPSON4000/7600/9600

3800/4800/7800/98004880/7880/9880/11880

Roland FJ 540

Inkjet Imaging


PiezoPiezo crystalcrystal

Jet compartment

Piezo crystal - technology

Inkjet Imaging


Inkjet Imaging - Epson Piezo Head


What about resolution?What about resolution?

Inkjet Imaging


Printer resolution

• The measurement unit for resolution is dpi

– dpi = dots per inch

– dpi = points per 25.4 mm

– 300 dpi = 11.8 points per mm

– 2400 dpi ≅ 95 points per mm

Inkjet Imaging


length of the edges = distancein combination with a quadrate

diameter = distancein combination with circle

D

AThe fact that white area rests between the circles needs an enlargement of the printed point It follows theoretically D = 1,4 x A

Printer resolution

Inkjet Imaging


Printer resolution, like 2400 x 1200dpi

Defines only the number of dots per square inch

Doesn´t define the diameter of the printed point

The following slide will show this fact.

Printer resolution

Inkjet Imaging


What about ink?What about ink?

Inkjet Imaging


• Dye based Ink+ like sugar or salt in water+ colorant (dye) is dissolved

at the molecular level+ high saturation– low UV and Ozone stability as

dye molecular bonds are broken by these effects

=> Indoor (several month up to years)

• Pigmented Ink+ like clay in water+ many molecules of colorant in

each pigment particle+ high UV and oxidation stability,

molecular bonds not as easily broken

– danger of settling down– today slightly lower colour

saturation than dye ink

=> Outdoor (>3year) and Indoor (>25 year)

There are two basic types of Ink . . .

Inkjet Imaging


6 month ozone influence at standard office condition during summerCanon S900 photo printer with dye ink

Protected with a clear PET filmProtected with a clear PET film Without protectionWithout protection


Dye Ink

Pigmented Ink

Latex inkPigmented

Aqueous Ink

Phase ChangeWax / ResinPigmented

Oilbased Ink

Low SolventPigmented

Eco SolventPigmented

Hard SolventPigmented

Solvent Ink Reactive inkUV curingPigmented

Non Aqueous Ink

Inkjet Ink Overview

Inkjet Imaging


Differences of inks

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Aqu

eous

ther

mal

Aqu

eous

Pie

zo

Oilb

ased

Solv

ent

Low

-, Ec

o-So

lven

t

UV-

curin

g

Late

x

Dye

Monomer

Polymer

Water mixible solidsolventSlow evaporatingsolventHygroscopic Solvent

Fast evaporatingsolventFast evaporatingwater


What about the Inkjet media ?What about the Inkjet media ?

Inkjet Imaging


Inkjet Imaging Aqueous Base


Inkjet Imaging Aqueous Base


Inkjet Imaging Solvent Base


Inkjet Imaging Solvent Base


Factors for Ink Jet Print Quality

• Printing head

• technology, resolution

• Printing mode

• printer, ink lay down

• Calibration (RIP) and Colour profiling

• Inks

• density, viscosity, surface tension

• stability

• Conditions

• temperature, humidity, air flow

• Media Substrate

• type, surface, optical

• Coating

• colour

• gloss

• ink capacity

• ink absorption speed

• dot gain

• adhesion

• resistance against scratching


Ink Jet Media Characterization

• Test Print

• Colour Measurement

• Dot Size Measurement

• Electron Microscopy

• Dynamic Ink Absorption

• Lamination compatibility

• Accelerated UV Exposure

• Physical Properties

• Printer related Reliability => Feeding, cutting, etc.


Test Print

• Colour Gamut• Gradation• Inter Colour Bleeding• Line Sharpness• Small Characters• Coalescence• Banding• Drying time• Water Resistance• UV Resistance• Lamination compatibility

Ink Jet Media Characterization


Lamination Compatibility

1. adhesioncoating to base materiallamination film to coating

2. Cohesionpaper base, coating

hot - cold laminationprinted and unprinted areas



Inkjet Inkjet SpecialitiesSpecialities -- BannerBanner


Inkjet Specialities Inkjet Specialities -- POS MediaPOS Media


Inkjet Inkjet SpecialitiesSpecialities -- Selfadhesive productsSelfadhesive products


Inkjet Inkjet Artistic SpecialitiesArtistic Specialities


Inkjet Films Inkjet Films -- BacklitBacklit Film / Window Film / Window GraphicGraphic


Inkjet FilmsInkjet Films

3.Exponga el bastidor a luz ultra violeta para transferir el diseño del positivo al bastidor llamado “screen”

2.Adjuntar el Positivo a un bastidor con emulsión. Se debe preparar un bastidor por cada

1.Prepare su diseño, Separe su diseño por color, e imprima cada color en un positivo independiente. Cada Color representa un color por separado y necesita su bastidor independiente

6.Agregue tinta al bastidor, cada color es aplicado de forma independiente

Pasos para Imprimir en Serigrafía - Screen

4.Lave las áreas no expuestas con agua


Inkjet Inkjet Papers Papers –– Proofing Proofing -- PhotoPhoto


After wetting the folded poster in water (up to 15 minutes)the spare water will be wiped off. This wet folded paper keepsin a plastic bag for one day up to three days.

Inkjet Imaging Papers - Product Range TriSolv.After print processing, billboard application


Apply glue to the billboard, paste the wet TriSolv paper onto the billboard and then wipe again with the glue over the paper.

Nearly 85% of all billboard posters are mounted by this procedure (international standard). The glue is standardized in most countries. The TriSolv Paper family is qualified by billboard companies for this kind of application.

8 hours up tothreedays

Inkjet Imaging Papers - Product Range TriSolv.After print processing, billboard application


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Education

Digital imaging training_2011 PrintLAT