Building a defect-free reel on the paper machine

More crepe wrinkles in reels occur today due to larger diameter reels, more calendering for a smoother finish, fillers causing increased paper density, and recycled furnish giving a lower coefficient of friction. Reel density analysis and J-line testing determine the quality of the parent reel and identify the location of small crepe wrinkles in the paper. The Reel Density Monitor displays the density profile of the critical primary to secondary arm transfer and often shows a consistent density decrease at the point of primary arm release. This paper compares the wound-in density profile with the nip load between the reel and the reel drum and shows the effect of the nip load on the density profile. Examples from two paper machines describe how this can diagnose reel building problems and optimize the parameters that control reel building.