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Rafi Bronstein
Inkjet ink
An inkjet ink is a low viscosity liquid containing various pigments and/or dyes and some other components. It is used for coloring a surface to produce an image
Spreads faster than it dries/cures
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Inkjet Inks
Inkjet inks are absorbent substances and require specially coated paper for optimum results.
“Photographic" inkjet papers “work” with the characteristics of the ink to reproduce photo-quality images.
Inkjet paper should have excellent ink adherence, high scratch and kink resistance, bleed control for sharp edges and high densities for more vibrant colours.
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Types of Inkjet Printing Substrates
Substrate is a term used in industrial printing to describe the base material onto which images will be printed. Base materials include (though are not limited to):
films,
foils,
textiles,
fabrics,
plastics,
any variety of paper and others
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Substrate Requirements
Runnability - the ability of the paper to be transported smoothly through the print engine;
Printability - the ability of the media, interacting with the marking material, to produce an image of the desired quality;
Usability - a variety of characteristics such as overall look and feel, freedom from curl, cockle and bleed-through, image permanence, and readiness for finishing operations such as folding, creasing and binding.
Lightfastness - ultraviolet or UV stability is a very important feature that is completely determined by the inks and media.
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Substrate Requirements
Porosity – special coating providing fast ink absorption
Gloss – type of finishing/coating that ensures special image quality
Minimal delta E
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Inkjet Paper
Inkjet paper is paper designed for inkjet printers, typically classified by its weight (gram/m2), brightness and smoothness, and sometimes by its opacity.
Inkjet printing requires the paper to have exactly the right degree of absorbency to accept the ink but prevent its sideways spread.
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Coated paper properties
- Limits and controls dot size and shape
- Holds colorant on surface, control the absorption rate
- Provide brilliant and neutral reflective background
- Reduces "curling"
- Provide various textures, and appearance
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Examples of Substrate Caused Print Defects
Curl
Puddling
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Examples of Substrate Caused Print Defects
Banding
Mottling
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Examples of Substrate Caused Print Defects
Bleed
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Types of coatings
Barrier coating (prevents saturation)
Reflective coating
Sealer coating
Texture/Finish coating
Gloss coating
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Ink Receptive Coatings
Base substrate: paper, PE film, fabric, vinyl …
Fiber based: coated
Photo based: glossy coating
Synthetic base: coated
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Inkjet Receptive Coating
Top coating
Back coat
Control coat
Cellulosefibers
PAPER CROSS SECTION
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Inkjet Receptive Coating Functions
Before printing: Tactile properties improvement (smoothness,
stickiness), optical properties (brightness, whiteness), mechanical properties (curl, coefficient of friction)
In course of printing Control the movement of ink vehicle on the surface, to
affect image quality and ink absorption rate
After printing: Durability, handleability
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Receptive Coating Components
Polymer coating Improves strength, affects wettability, holds
colorant at the surface, improves smoothness
Pigment coating Increases stiffness, affects porosity, absorbs
water, increases brightness and opacity
Additives Improves manufacturing conditions
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Types of Inkjet Receptive Coating
Porous coating
H2O/Solventevaporation
SUBSTRATE SUBSTRATE
SUBSTRATE
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Types of Inkjet Receptive Coating
Swellable coating
H2O/Solventevaporation
SUBSTRATE
SUBSTRATESUBSTRATE
•Hybrid coating
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Porous Coating
Absorbs ink via capillary pressure
Fast ink absorption
Limited ink holding capacity
Potentially high water resistance
Low lightfastness with dye inks
Colorant penetration
Limited substrate choice
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Swellable Coating
Absorbs ink via solvation and diffusion
Slow ink absorption
Large ink holding capacity
Potentially low water resistance
High lightfastness with dye inks
Suitable for a variety of substrates
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Hybrid Coating
A subclass of swellable coating
Requires large amount of coating pigment
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Photographic inkjet paper
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Film substrates
TRANSPARENCY FILM Special surface to hold the ink
SILVER REFLECTIVE FILM
Excellent special affects; Applications include marketing, certificates, crafts, business cards
WINDOW DECAL Clear film with an adhesive backing
Backlit film Is a unique translucent flexible sign face material,
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Film substrates
Mesh - A unique open-weave flexible sign face material. Bright white background for accurate colors Material consistency for image quality Strong lightweight flexible material Stretch-free for long-term mechanical stability Semi-gloss finish for luminescent graphics Resists scratches, punctures, wrinkles and folds Seamable
Canvas - An environmentally friendly polyester fabric. Coated for optimized ink adhesion and color reproduction
Bright white background for accurate colors Unique texture for optimized print results Stretchable fabric for framing Optimized tensile strength for Matte finish for indoor application Sewable Repels pollution and washes clean in water Tolerates repeated rolling and unrolling
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Polyester Substrate
Image printed on uncoated (left) and coated (right) polyester films
Imaged polyester with cracked coating in printed area
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Finishing
Hem
Seaming
Sewing
Pole Pockets
Grommets
In panels
No finishing
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New substrates drives
Digital printing
New applications enabled
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Ink jet Printing Substrates
1985 1990 1995 2000 2005 2010
Paper
Paper
Mylar
Paper
CAD
GA
Wide Format
Security
Paper
Textile
Rigid
Signage
Floor covering
Wall Covering
POP
Fabricated products
Printed glass
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Q&A
Do you have any questions?
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Thank you