| 摘要 |
A security bag 30 formed of sheet material comprising a tamper evident closure portion 50 a part of which is superimposed on a first portion of the sheet material and joined to it in the region 70 of the superimposition; wherein an externally visible random or pseudo-random pattern 60 is applied to at least part of a surface of the closure portion in the region of the superimposition and extends beyond the superimposition in one direction so that any attempt to superimpose another tamper evident closure portion to conceal damage caused by tampering is exposed by the lack of registration of the patterns. The closure portion maybe formed by a tamper evident security tape 10. The pattern 60 may be a series of differently spaced words, Figure 3. Another part of the closure portion 50 may carry a discontinuous adhesive pattern on its inner surface which contacts a part of the bag material bearing a water-soluble ink pattern, Figure 7. |
