Next Generation
Roller Nip Control
Precise - Clean - Consistent
 

• Why important
• Winning Edge
• Measuring Methods
• Data Sheet
• Fact Sheets

Semi-Dynamic roller nip control with digital device

Semi-dynamic measuring is performed with the print rollers at slow speed. This is the most authentic technique for analyzing a roller nip, since the shape of the rubber roller changes when in motion. For optimum roller control, semi-dynamic measuring is the right choice.

When adjusting the roller nip, the most common mistake is applying too much pressure. This often occurs when the roller is old and the rubber hard. To achieve the desired nip width, pressure is increased to give the correct measurement in millimeters (mm). However, this will result in an incorrect dynamic pressure level.

The Nip Control device, the Roller Nip Indicator, featuring a dynamic sensor, measures the nip width relative to a pre-determined dynamic pressure level between the rollers (Rolling NipTM). The instrument incorporates viscoelastic changes, preventing deviation in roller nip pressure that could destabilise the printing process.

Static roller nip control with digital device
Static roller nip measurement is easily performed. The Nip Control static sensor is placed between the static rollers. A reading in millimeters (mm) is displayed continuously on the easyview display. Pressure is adjusted as required, until the correct value has been achieved. Measurements are taken on the sides of the roller and in the center.

No ink is needed, and no cleaning is necessary. The measurement and the settings will always be the same – whoever performs the task. However, if troubleshooting is still required while in production mode, it is possible to do so with ink on the rollers.

Nip width reading with inked stripe
The rollers have to be inked. Roller contact width in millimeters (mm) is estimated by measuring a line with an indistinct edge. This method detects neither the viscoelastic changes in the rubber or aging effects.

Nip pressure indication with a strip
A plastic strip is placed between the printing press rollers. The operator tests resistance manually, to estimate drawing power and mean nip pressure.