A packaging box in which, in one plate and one lid plate connected to an upper end portion of the side plate constituting the packaging box, one creasing line parallel to the upper end portion is formed for each, and two cut lines are formed so as to connect the end portions of the creasing lines. Provided is a packaging box from which a stored article can be easily taken out when a lid plate is opened, and which can endure a compressive stress imposed when a multiple number of the boxes are piled up.
1. A packaging box having at least one side plate and at least one lid plate connected to an upper end portion of the side plate, wherein
a first creasing line parallel to the upper end portion of the side plate is formed in the side plate,
a second creasing line parallel to the upper end portion of the side plate is formed in the lid plate,
a first cut line is formed so as to connect the left end portion of the first creasing line formed in the side plate and the left end portion of the second creasing line formed in the lid plate,
a second cut line is formed so as to connect the right end portion of the first creasing line formed in the side plate and the right end portion of the second creasing line formed in the lid plate, and
the first creasing line, the second creasing line, the first cut line and the second cut line are formed only in one side plate and one lid plate connected to the side plate among those constituting the packaging box, and
the packaging box has at least one bottom plate and two pairs of facing side plates for storing n of flat inner boxes in a storage space formed by the bottom plate and side plates, wherein,
one pair of facing side plates constituting the packaging box have substantially the same size as that of a side plate constituting the inner box and having the largest area,
another pair of facing side plates constituting the packaging box have a width n times the thickness of the inner box, and
a label is stuck on a surface of a side plate to be brought into contact with an inside surface of a side plate of the packaging box among side plates constituting the inner box, and the label has a coefficient of static friction measured in accordance with Japanese Industrial Standard JIS P8147 of 0.20 to 0.40 against the inside surface of the side plate of the packaging box.
2. The packaging box according to claim 1 , wherein the first cut line and the second cut line are straight.
3. The packaging box according to claim 2 , wherein the first cut line and the second cut line are parallel to each other.
4. The packaging box according to claim 1 , wherein a third creasing line parallel to the first creasing line is formed between the first cut line and the second cut line formed in the side plate.
5. The packaging box according to claim 1 , wherein curvilinear slits or through holes are independently formed at the lower end portion of the first cut line, the lower end portion of the second cut line, the upper end portion of the first cut line and the upper end portion of the second cut line so that the cut lines should be connected to the first creasing line and the second creasing line via the curvilinear slits or through holes.
6. The packaging box according to claim 5 , wherein the curvilinear slits having a radius of curvature R of 2 to 20 mm are independently formed at the lower end portion of the first cut line, the lower end portion of the second cut line, the upper end portion of the first cut line and the upper end portion of the second cut line.