Why are ream wrappers plastic coated?
When copy paper goes though a copier or laser printer, it is heated on one side, to fuse the powdered toner into the surface of the paper. Heating one side of the paper dries it and causes it to shrink, and this in turn introduces a tendency to curl. Too much curl may cause paper jams, so to minimise this effect the paper is made with low moisture content. In order to maintain the low moisture content, the paper must be wrapped in a moisture-proof wrapper.
