TAMPER-PROOF PROTECTIVE BAG Russian patent published in 2016 - IPC B65D33/34 

FIELD: instrument making.

SUBSTANCE: tamper-proof bag with a tamper-evident indication comprises front wall (32) and rear wall (30) which form the bag having a hole. Rear wall (30) provides an integral cover flange (34) extending behind the hole for closing the hole by folding over the hole and its sealing onto the front wall (32). Cover flange is equipped with tamper-evident elements including disengaged layer (51) in the form of pattern, paint layer (54) applied onto the disengaged layer, thermochromic ink (56) applied onto the area at a distance from the disengaged layer (51), covering layer of paint (54) and adhesive (57). Adhesive is applied onto the cover flange (34) covering the tamper-evident elements, and onto the rear wall (30) inside the bag hole, so that in use the back surface of the edge of the front wall (32) is affixed to the rear wall (30) for closing the hole before the cover flange (34) is folded and sealed to the front wall (32).

EFFECT: invention provides reliable tamper-evident indication.

6 cl, 25 dwg