| 摘要 |
A protective wrap material (10) enclosing a stack of cut sheets of paper is folded so that overlapping flaps (20) of the wrap material cover opposite ends of the stack. The overlapping flaps are secured and sealed together on ly at selected areas (14,15) that comprise a minor portion of the overlapped flaps, wherein the sealed areas have sufficient burst strength to avoid ina dvertent opening of the wrap but at the same time are relatively easy to sep arate when it is desired to open the wrap to gain access to the cut sheets o f paper. In a preferred embodiment the wrap material is heat sealable, and a modified heat plate (16) for applying heat only to the selected areas has a grooved front surface (17) defining heat focusing bars (23,24) that concent rate heat sufficient to fuse the wrap material only in the selected areas. |
