inkjet technology. most usable technology for coding and marking Solution. cij - continues ink jet

1. Ink Design Of CIJ.
Ronak Joshi
E-ronakjoshi89@gmail.com
91-9730072283

2. CIJ inks
• Key Properties
- Flow
- Jet Stabilite
- Surface Tension
- Conductivite
- Stability

3. Flow Properties
• Ink viscosity
– Each commercial printer configured
differently
– Values range from 1 to 10 cP.
– Viscosity at nozzle is very different

4. Jet Stebility
• Largely influenced by polymeric binders
• Molecular weight determines viscoelastic
effects
• High molecular weight causes erratic satellite
formation
• Satellite & Ligament formation critical

5. Surface Tension Properties
• Largely influenced by solvent base
• Interfacial energy between polymer &
solvent
• important
– controls cleanliness of droplet (PQ)

6. Conductivity
• Charging & Phasing
– needs to be accurately controlled
– source of many ink failures
• Salts added to provide ink conductivity
– typically 500 - 1000 micro siemens per cm
• Recirculating sensor
– conductivity used to activate ink return
mechanism

7. Stability
• Corrosion
– especially lower cost
components in
printheads
• Nozzle crusting
• Ageing stability
– purity of flow through
• nozzle
– no chemical change
after 1 month at 60oC
• Chemical compatibility
– purity of colorant
– salt, polymer and
• colorant interactions
– solubility over a
• temperature range 5oC
• to 60oC

8. Jet Break up Images
• Strobed optical image capture of a continuous inkjet jet
travelling at 27m/s
• creating 64,000 drops per second with each drop
approximately 1.5 nano litres
Ideal droplet formation
reliable ligament control
Poor droplet formation
erratic and long ligaments
Difficult droplet formation
Highly visco-elastic jet

9. Ink Formulations CIJ
• Solvent and Water based inkjet inks
• Binder / Polymers
• Colorants
– Dyes
– Pigments
• Conductivity salts
- Formulation specific
• Additives

10. Types of CIJ Ink Formulations
• Solvent-based inkjet inks
– solvents provide fast dry times
– Range of polymers available for adhesion on
non porous substrates
– Flammable and VOC issues limit growth to the
applications
• Water-based inkjet inks
– VOC constraints using solvent-based inks
driving new development
• UV curable inkjet inks
– Capital cost and use of uv light limits use with
cij systems

11. Ronak Joshi
E-ronakjoshi89@gmail.com
91-9730072283
Thanks
Ronak Joshi