A reel crushed at the edge tears while feeding on the press; from that point the product is scrap. Loss of value starts at the surface and the edges. A reel's weak spots are well known: the edge gets crushed by knocks, the surface gets scratched or dirty, the core collapses under too much pressure and the body goes out of round in the wrong stack. An out-of-round reel runs unevenly on the machine and upsets the tension of the paper web. Core damage is hard to see from outside; it often only shows when the reel is mounted on the machine.
That is why the equipment matters as much as the product. Clamp pressure is set to the grammage and diameter of the reel: too much crushes the core, too little lets the reel slip and fall. Because the clamp arms grip the reel by its outer surface, the contact points need to be clean and smooth, or they leave marks. The size of the clamp and the way it grips also need to suit the reel's diameter and width.
Paper takes in and gives off moisture. Unbalanced humidity causes waviness, curl and inconsistent printing. When a cold reel comes into a warm, humid space, condensation can form on its surface; outer layers that get wet may not lie flat again even once they dry. A level floor, cleanliness and a stable indoor climate are therefore part of the job. We set out the different needs of our two product groups side by side under storage by product group.