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Products │ Density Measurement
Open and Closed Loop Ink Density Measurement
- Single head or multi-head systems
- Open or closed loop
- Suitable for Offset, Flexo or Gravure
- Absolute density measurement
- Use of ploarization filter for wet ink film
- Density measurment range > 2 D
- Measurement precision < 0.05 D
- Resolution: 0.01 D
- Automatic dirt compensation
- LED illumination
- Standard measuring area: 4 X 4 mm
- Optional smaller measuring areas
- User interface: graphic touch screen
Why Invest In IN-Line Density Measurement?
- In roll to roll applications, operators must stop the press to see color shift.
- To insure consistent color in a roll to roll application, color MUST be monitored on a continuous basis
- Most presses are run with a minimal crew, which must take care of the entire process. As a result, there is usually little time or effort spent checking color intensity without neglecting other processes.
- There is an increasing demand for quality reports by print buyers. IDM offers up to 50.000 single measurements (depending on press speed and amount of colours) per minute, which can be used for the documentation of the quality.
- It is common for paper density values to varry. Even small paper density variations can cause color density deviations.
- very change in press speed, cause a change in color density.
- As ink temperature changes, so will density.
Key Influences of Ink Density
Paper
•Small changes in the paper quality cause density variations
•Every reel change causes density changes
Speed Changes
•Every change of the press speed will cause deviations in the density because the transport of the colour from the inker to the substrate is not linear to speed changes.
Temperature
•The temperature has a significant influence on the viscosity of the ink. Due to environmental influences or to the duration of operation the press develops more or less heat in the inkers. Even the substrate can have different temperatures and thus influence the ink. Viscosity changes of the ink will also cause variations in the overprint of the different inks because of the wet on wet printing in the offset technology.
Ink Train
•The “ink train” is the timeframe that the press needs on a certain ink key position to execute a density change. For example does it always take longer to execute downwards to a lower density level.
ROI of 7-9 Months
When compared with a conventional press using manual color checks, IDM has been shown to pary for itself in 7-9m months, as illustrated in the example below. Click on the chart to open it in a larger window.
Successful Installations
IDM has been fully tested and prooven in working press rooms! We have numerous successfull installations and customers that will gladly speak with you and share their success stories with BST's density measurement product.
- Single unit density measurement
- IDM operating screen
- Multi head unit
- Easy to use graphic touch screen interface
- On press tests document that density changes with press speed
- IDM unit easiy mounts on press
