| 摘要 |
PROBLEM TO BE SOLVED: To provide a quadratic carton capable of delivering a piece of blank in a sack-pasting or case-forming state, and further facilitating assembling work and being effective from a view point of logistics.SOLUTION: Each of cover panels 10-13 is constituted of four linear portions in a shape having rectangular four corners cut in a circle and peripheries connected with each other, and of four curved portions. A length obtained by coupling the linear portions connected to the front rear side surface panels 2, 4 with the curved portions of both sides thereof corresponds to a width of front rear panels 2, 4. A length of the linear portions being in parallel to the sides of front rear side surface panels 2, 4 corresponds to a width of left right side panels 1, 3. In the top and bottom of each of the front rear side surface panels 2, 4, there are provided projections 2a, 2b, 4a, 4b projecting to space between the curved portions of continuously arranged cover panels 10-13. The cover panels 10-13 are folded inward to the front rear side surface panel 4, and fitted along the inside of the projections, and thereby the front rear side surface panels 2, 4 form a quadratic surface matched with the shape of the cover panels. |
