Editing Paper machine (section)

=== Reel section ===

After calendering, the web has a moisture content of about 6% (depending on the furnish). The paper is wound onto metal spools using a large cylinder called a ''reel drum''. Constant nip pressure is maintained between the reel drum and the spool, allowing the resulting friction to spin the spool. Paper runs over the top of the reel drum and is wound onto the spool to create a ''master roll''.

To be able to keep the paper machine running continuously, the reel must be able to quickly switch from winding a finished roll to an empty spool without stopping the flow of paper. To accomplish this, each reel section will have two or more spools rotating through the process. Using an overhead crane, empty spools will be loaded onto two ''primary arms'' above the reel drum. When the master roll reaches its maximum diameter, the arms will lower the new spool into contact with the reel drum and a machine behind the drum will run a tape along the moving sheet of paper, swiftly tearing it and attaching incoming paper onto the new spool. The spool is then lowered onto the ''secondary arms'', which steadily guide the spool away from the reel drum as the diameter of paper on the spool increases.
 
The [[Roll hardness tester|roll hardness]] should be checked, obtained and adjusted accordingly to insure that the roll hardness is within the acceptable range for the product.