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    • 8. 发明专利
    • EASILY UNSEALABLE PACKAGING BOX
    • JP2003231518A
    • 2003-08-19
    • JP2002032023
    • 2002-02-08
    • SNOW BRAND MILK PROD CO LTD
    • MATSUNO ICHIROHIRATA MASANORISHIMIZU KEISUKESASAKI KEITAKU
    • B65D5/54
    • PROBLEM TO BE SOLVED: To provide a packaging box capable of controlling contamination by rubbish or the like as much as possible, provided with cut lines enabling the box to be reliably broken in a desired direction, and capable of easily opening the box when unsealed. SOLUTION: The packaging box is formed by folding a paper-like member with cut lines into a polyhedral shape and has at least one face of an opening face where the cut lines are broken to open the greater part of an area thereof when predetermined stress is applied to the cut lines. The box has a substantially arcuate push- cutting line which is provided in an initial opening face adjacent to the opening face through one ridge and which connects two end points arranged on the boundary ridge at an interval of about the width of a finger. By pressing the initial opening face surrounded by the push-cutting line with a finger, the push-cutting line is broken, thereby initially opening the box. The opening face is provided with guide cut lines continuing from the push-cutting line for the initial opening face and somewhat extending in a substantially vertical direction with respect to the boundary ridge, and with cut-opening lines continuing from the guide cut lines and reaching portions near the side parts of the opening face adjacent to the boundary ridge. By expanding an opening surrounded by the guide cut lines and the cut-opening lines, the guide cut lines and the cut-opening lines are broken to open the box. COPYRIGHT: (C)2003,JPO