Characteristics and Principle of Tamper-proof Unsealing Bag
Characteristics and Principle of Tamper-proof Unsealing Bag
The utility model discloses a tamper evident, unsealing packaging bag, which includes a rectangular transparent plastic bag body. Both sides of the plastic bag body are sealed by two heat sealing tapes. A letter band is set between the two heat-sealing bands on each side. The mouth of the plastictamper evident bag body is sealed by a non-transparent adhesive layer, and a letter-shaped pattern block is provided in the adhesive layer which can be peeled off when torn. Due to the use of double heat-sealing tapes on both sides of the packaging bag, there is a row of unsealed letter tape between the two heat-sealing tapes. When the outermost heat-sealing tape is cut, the packaging bag cannot be opened. When the second heat-sealing tape is cut, the letter tape is destroyed, and the seal can be seen at a glance. In addition, when the mouth of the tamper evident bag is strongly torn, the character-shaped pattern block of the adhesive layer is stuck by the bag body on one side, and the word is displayed after tearing. Even if the bag mouth is re-attached, it cannot be completely restored. The utility model is easy to find after being unsealed, and has good anti-unsealing properties.
It is characterized in that the bag mouth of the plastic bag body is provided with a thermochromic strip.