said fold edge are inserted in the slots f 1 f 2 when the box is assembled the edge parts p 1 p 2 p 8 are raised so that they are perpendicular to the face plane of the bottom area e every second edge part p 1 p 3 is folded so that for example the ends p 1a p 3a which are inclined in relation to the directions or lines of the creases d 1 d 3 are placed between the edge parts p 2 p 2 u2032 p 4 p 4 u2032 of the adjacent edge sectors the edge tongues c 1 c 2 of the fold edge p 2 u2032 are locked in the corresponding slots f 1 f 2 in the middle part e the inclined end p 1a of the edge part p 1 is locked between the edge parts p 2 p 2 u2032 fig2 b illustrates the formation of the bottom part 10 a 1 and so also of the cover part 10 a 2 of the storage box 10 for doctor blades so that the edge parts p 1 p 2 p 2 u2032 are folded in the way described above so that the edge tongues c 1 c 2 of the edge parts p 2 u2032 are fitted into the corresponding slots f 1 f 2 in the bottom area e the construction of the cover part 10 a 2 is equal to the construction of the bottom part 10 a 1 the cover part 10 a 2 has larger measures than the part 10 a 1 and so the cover part 10.