CARDBOARD BOX CARDBOARD SHEET FOLD LINE FORMING METHOD AND CARDBOARD SHEET FOLD LINE FORMING DEVICE

摘要

And provides a corrugated cardboard box which is easy to package the product and has excellent flap collision accuracy. A regular ruled line 15 is formed between the upper flap 11 and the peripheral wall 31 of the corrugated cardboard box such that the upper flap 11 is folded inwardly of the peripheral wall 31 and the inner liner 2 is recessed do. Like grooves 15 are formed on the side of the upper flap 11 with respect to the ruled line 15 so that the upper flap 11 is folded to the outside of the peripheral wall 31 in parallel with the ruled line 15, Thereby forming an inverted ruled line 16. A ruled line 24 is formed on the opposite side of the ruled line 15 with the ruled line 16 therebetween and the inner liner 2 side is recessed in parallel with the ruled line 16.