End wall made of material which can be shaped without cutting for a winding film

An end wall for a winding roll made of a material shapable without cutting, said end wall being generally rectangular with rounded corners and comprising:

• (a) a front side facing the winding roll which forms a flat surface, said front side including
• a central push-in peg;
• and
• hollow cylindrical locking bosses located on said rounded corners and having substantially the same radius as said rounded corners wherein said locking bosses further include a boss extension and a shoulder;
• (b) a rear side facing away from the winding roll and reinforced by radial and annular ribs, said radial ribs including reinforcing webs disposed in the radial ribs, said rear side further having recesses defined by said rounded corners and by rounded webs wherein said rounded webs have cylindrical reinforcing webs disposed therein, said cylindrical reinforcing webs having a diameter larger than a thickness of said radial ribs and larger than a thickness of said rounded webs, said reinforcing webs of said rounded webs and said radial ribs extending at right angles to said front side, wherein said recesses adjoin said hollow-cylindrical locking bosses;
• (c) a plurality of first side walls located between said front and rear sides, each of said first side walls including:
• a plurality of stacking bosses;
• and
• a plurality of stacking pockets, wherein said stacking bosses are complementary in shape to said stacking pockets for providing mutual engagement without a gap of the stacking bosses and stacking pockets during lateral stacking of a plurality of end walls;
• and
• (d) at least one second side wall located between said front and rear sides, each said second side wall including grooving extending over a portion of the length of said second side wall interrupted by guide slots that are inwardly recessed with respect to said grooving.