Universal book protecting cover of several blanks - has variable width spine blank, with top side blank consisting of top and bottom portions

摘要

The top (1), rear side (2) and spine blank (3,3a) are firmly coupled together. The top blank has a top portion (4) with upper and lower folding parts (5,5a), and an inwards folded lower portion (6), with both parts loosely folded over each other. The lower portion is adhere to the folding part (5a). The other folding part (5) is folded over a variable wide side and glued to the lower portion, forming an insert pocket. The folding parts of both top and rear side blanks have incisions (7). So that they can be folded over and inside the book hard covers. USE/ADVANTAGE - For school books, books of any thickness, width, or height, with rapid book insertion in the prefab. dust cover.