Online Density Measurement System for Paper Machines
To make the paper reels of high quality is a good density measurement system is necessary.
The Density Measurement System has an extremely advanced pulse counter made in programmable logic circuits.
The pulse counter is done with a specially developed algorithms to provides an extreme resolution and 60 layers of paper after reel change are the density measuring working (see Figure 1).
Thickness and density measurement is updated every three layers of paper.
Figure 1: Reel shift data logging, diagrams as a function of time.
Control of nip is most difficult from turn-
Paper Machine Reels
After all the effort that has gone into producing a high quality sheet of paper prior to the paper machine reel, it is crucial to build a good quality jumbo reel. This ensures that crepe wrinkles, for example, do not result in losses. One of the key parameters in building a good quality jumbo reel is nip load. Variations in nip over the building time of the jumbo reel cause differences in reel density and wound in tension and hence result in crepe wrinkles as the layers slip over each other.