PURPOSE: To provide a corrugated cardboard case which is tough against shocks and facilitates hand carrying and drawing from a shelf and also separation of the corrugated cardboard from plastic containers on disposing, by providing perforations for piercing the cardboard case material by which holes can be opened on at least three side-faces and the top face.
CONSTITUTION: In a corrugated cardboard case to pack used plastic containers, perforations 5a-5d piercing the cardboard case material by which handling holes can be opened on the side faces 5A-5D of the cardboard case, are provided. And perforations 4a piercing the case material are made to cut a discharge opening on the top face 4A. On assembling, a hot melt adhesive is applied on the sticking tab 7. The shape of perforations is arbitrary, such as circle, ellipse, rectangle. It is favorable that the holes opened by perforations have the shape useful for handling. And it is also favorable that the holes on the opposite sides have the same shape with each other and the holes are positioned to coincide with each other when superposed.
UEHARA MASABUMI
SUGAIWA TAKAYUKI
