CARDBOARD BOX CARDBOARD SHEET PERFORATION FORMING METHOD CARDBOARD SHEET PERFORATION FORMING DEVICE AND PERFORATION FORMING UNIT

摘要

Provided is a corrugated cardboard box in which a perforated line for flap separation is not easily broken when the flap is folded. A groove-like inverted ruled line 16 in which the outer liner 1 side is recessed and a region in which the inverted ruled line 16 extends are formed at the boundary between the upper flaps 11, 12, 13 and 14 and the peripheral wall 41 Like concave portions 19a and 19b with a recess on the side of the inner liner 2 are formed in the groove-like concave portion 19b, 17 are formed and the upper flaps 11, 12, 13, 14 are folded along the perforations 17 to the inside of the peripheral wall 41.