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SPI says D-Nip is first dynamic nip width profiler East Hanover, NJ-based Sensor Products, Inc. says its D-Nip® is the first dynamic, electronic, real-time nip profiling system. The system is designed to reveal inaccurate roll alignment, roll skewing and crown deficiencies. Any of these problems can result in uneven processing, wrinkled or mottled products, compacted sheets, excessive sheet breaks and blackening during calendering. D-Nip consists of a sensor element chain and data collection unit that resides on the roll surface and journal. Madeline Glomsten, SPI’s Nip Products Group manager, says, “The sensor system measures nip width (contact width between rolls) across the length of the press as the rolls are rotating. Dynamic nip measurement tools are the next step in the evolution of nip products and are particularly beneficial for rolls with interlock systems — when the nip cannot be closed statically or the material on the rolls takes a set from static impressions. The new product enables the user to make adjustments and observe results in real time, accelerating the diagnostic speed of a given section of a paper machine.” D-Nip is temporarily physically fixed to one of the roll surfaces. Each revolution of the rolls produces one nip reading that is transmitted via RF signal to a host laptop computer where the data are quickly displayed in a graphical format. The system calculates how long the sensor is compressed at the nip point thereby enabling very accurate and repeatable nip width derivations. Data integrity is ensured as a result of built-in redundancy within the sensor element actuators and employment of validation algorithms. PI Sensor Products, Inc.
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