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Rheonics InkSight Viscosity Control: The way to stay on color

InkSight (RPS - Rheonics Printing Solution) : Features and Advantages

Key advantages of Rheonics InkSight Viscosity Control

  • Robust, maintenance free viscosity sensor eliminates need for re-calibration
  • Agile viscosity controller reduces viscosity variation to better than 1% over entire print run, regardless of length
  • Simple, intuitive graphical interface with touch-screen control
  • Tighter, more accurate viscosity control
  • Dramatically reduces waste
  • Improves print quality and uniformity
  • Reduces ink consumption
  • Reduces setup time

Rheonics SRV Inline Viscosity Sensor

Inline viscometer viscosity meter used for printing, coating reaction monitoring Rheonics SRV
Fig-2. The SRV sensor after measurement in cyan ink

Figure 1. The SRV sensor after measurement in cyan ink

  • Built-in accuracy – never needs re-calibration
  • Stable and reproducible – Normal press cleanup cycle suffices to maintain accuracy
  • Robust – Heavy soil can be cleaned with solvent-soaked pad with no risk of damage
  • At home everywhere – patented symmetric resonator design ensures independence of mounting conditions

Here is an excerpt from the Rheonics SRV specification sheet:

Fluid Measurements
Viscosity Range3 to 10,000 cP (standard)
0.5 to 50,000+ cP (available)
Viscosity Accuracy5% of reading (standard)
1% & higher accuracy available
ReproducibilityBetter than 1% of reading
TemperaturePt1000 (DIN EN 60751 cIass B)
Operational Conditions
Process Fluid Temperature-40 up to 300 °C (575°F)
Ambient Temperature-40 up to 150 °C
Pressure Rangeup to 7,500 psi (500 bar)

InkSight Controller for accuracy that lasts

Viscosity control to better than 1%, regardless of print run length.

Temperature compensated viscosity (black) and temperature (green) vs. time

Figure 2. Temperature compensated viscosity (black) and temperature (green) vs. time. Vertical magenta lines show automatic solvent dosing by InkSight controller

Why ink viscosity matters?

  • As solvent evaporates, pigment loading increases. Viscosity is a measure of pigment loading
  • When pigment loading is too high, ink does not flow properly and consumption is too high; when too low, color density suffers and print quality goes down
  • Viscosity control by solvent addition keeps print quality high, even during long runs.
Fig-7. Color density variation with ink dilution and viscosity

Figure 3. Color density variation with ink dilution and viscosity

For more information on why viscosity is critical in printing process, please read our application note – Optimising printing applications through inline process monitoring.

Read the application note

SRV and InkSight take temperature out of the equation

Ink viscosity is temperature sensitive. Each ink’s viscosity behaves differently as temperature changes.

Fig-1. Temperature dependence of ink viscosity

Figure 4. Temperature dependence of ink viscosity

Temperature compensated viscosity, calculated from temperature and measured viscosity, gives a true measure of pigment loading. SRV and InkSight control temperature compensated viscosity by replacing solvent lost to evaporation. Result: Pigment loading and flow characteristics are kept constant, regardless of temperature.

SRV and InkSight measure viscosity where it counts, not where it’s easy

  • Ink viscosity is shear-rate sensitive. Each ink’s viscosity depends on how fast it’s flowing. Cup measurements can differ from inline measurements by 20% or more
  • SRV measures viscosity in the ink supply line, where it’s flowing under real-world conditions. SRV measurements reflect viscosity of the ink while it’s working, not resting

SRV and InkSight give stable and reliable viscosity measurement and control – you can focus on print quality instead of measurement skills!

  • Robust accuracy and repeatability mean you can take the sensor out of the equation. No maintenance, no recalibration = no attention needed. It just does its job
  • Temperature compensation means you can take temperature out of the equation. No need for temperature measurements and compensation formulas. SRV and InkSight do it for you. Just set the desired viscosity and let the system do the rest
  • You can take the cup out of the equation. Ink viscosity is measured under actual flow conditions. No need for – often inaccurate – conversion formulas between cup seconds and actual viscosity values. The value that is measured is the value that does the controlling.

RPS Integration

Simple Steps

Get on color, check your Delta & Densities when they pass lock in the viscosity following the steps listed below.

1. Select print unit on INKSIGHT panel

1. Select print unit on INKSIGHT panel

2. Click Set.

2. Click Set

3. Stay on color within 0.5 cps

3. Stay on color within 0.5 cps

Standard system configuration

  • SRV Sensor located inline on exit of your pump connected to our main control cabinet behind the press
  • Pneumatic solvent control valve connected to our main control cabinet with ¼” feed line of solvent from central tank to each ink bucket
  • Central Control Panel for all units is located in your main console
InkSight-FlowChart

Figure 5. Operators’ interface with RPS (Multi-station ink console and handheld console)

Inline sensor mounting adapter

Figure 6. In-Line Sensor Mounting Adaptor

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