| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a paper pack capable of simply ascertaining the residual presence of, or the residual quantity of, a liquid drink, with which the paper pack is filled, by way of visual observation from the external side. SOLUTION: The paper pack including an outer circumferential body 3 and a window 5 constitutes a closed space 1 having watertightness as a whole. The window 5 is provided at part of the outer circumferential body 3 is such a manner as to have a width and to extend upwardly from a lower position of the closed space 1. The residual presence of, or the residual quantity of, a liquid drink 39 is invisible from a portion of the outer circumferential body 3 since it is opaque, but can be ascertained by peeping into the paper pack through the window 5 or by visually observing the relation between the window 5 and a liquid level therethrough.</p> |
