A case conversion process has been investigated with a view to understanding and ultimately improving the case quality. In particular, fishtailing, or the squareness of case, has been studied in relation to creasing, folding and gluing. The process has been optimized in terms of fishtailing on the individual panels. Uni-directional fishtailing results have been attributed to the existing method of folding. To this end, the folding mechanism has been studied and two innovations, generic to any continuous folding operations, have been suggested: the coil cam and the twin cam.