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Tamper evident cappers are designed to apply a heat shrinkable film sleeve around the neck and cap of a bottle or container. Once the film sleeve around the neck and cap of the container is shrunk using heat, the sleeve creates a film seal that will be destroyed if the cap of the container is removed from the container. If the film sleeve seal is intact, the film sleeve serves as evidence that the product inside the container has not been tampered with, hence the name tamper evident seal. (For more information see Capper / Neck Band.)
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