Roll alignment for smaller nips

8 October 2008


New from Sensor Products is an electronic nip analysis system claimed to measure roller profiles and diagnose roll alignment “with unprecedented speed, cost effectiveness, and accuracy”.

Using technology derived from the company’s Sigma-Nip, which characterizes roller profiles for larger rolls, the Mini Sigma-Nip measures nip widths of rolls with circumferences smaller than 51cm. It can also diagnose and measure larger hard rolls that have narrow contact upon closing.

In Mini Sigma-Nip, sensors capture data and record nip width readings while being viewed on a laptop or computer connected through wireless or USB. Adjustments to load are made in real-time while the sensors are in the closed (non-rotating) nip. Problems with alignment, skewing, and crown deficiencies are quickly exposed, it is claimed.

Sensor Products says the system is useful for continuous maintenance, as well as during equipment set-up and shutdown. “Data that has been stored can be easily reviewed and web control is improved as evenly loaded roller sets are much less likely to cause web breaks and costly downtime,” the company states. “Uneven material pulling, sheet walking, wrinkles, jams and print misregistration are greatly reduced.”

The software includes a Comparison Mode, where up to three nip width readings can be viewed simultaneously, and an Alignment Tool, which instantly draws a line to indicate nip width variations.

Minimal computer knowledge or training is needed, it is promised, as the system prompts the user through the few steps needed for installation and set-up.




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Sensor Products



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