Tamper-evident label
A label is provided with a warning layer coating integrated or applied to a front side of the label. The warning layer coating is not activated by application of heat; rather, the warning layer coating activates upon a directional force (vertical or horizontal puffing) applied to the label after the label was initially adhered to a container, bag, box, and/or object. Upon activation, visible color or a printed warning indicia is visible on a front surface of the label, providing evidence that the label was removed after initial application or providing evidence that the label was attempted to be removed after initial application.
1. A label roll, comprising:
a substrate;
a plurality of labels defined within portions of the substrate; and
each label comprises:
a thermally-sensitive coating disposed on a frontside of the substrate;
a warning layer coating disposed on the frontside of the substrate; and
an adhesive coating disposed on a backside of the substrate;
wherein the warning layer coating comprises heat-resistant capsules, each heat-resistant capsule comprises a food safe liquid within a shell membrane;
wherein the food safe liquid within the corresponding shell membrane of each heat-resistant capsule exhibits no color;
wherein the food safe liquid exhibits a non-white color on the frontside of the substrate when the corresponding shell membranes of the heat-resistant capsules are ruptured by a directional force applied to each label and the food safe liquid combine together on the frontside of the substrate.
2. The label roll of claim 1 further comprising a liner affixed to the backside of each of the plurality of labels via the adhesive coating of each label.
3. The label roll of claim 1 , wherein for each label, the warning layer coating is applied on top of the thermal-sensitive coating.
4. The label roll of claim 2 , wherein for each label, the warning layer is applied as patches of the heat-resistant capsules on top of the thermal-sensitive coating.
5. The label roll of claim 1 , wherein for each label, the food safe liquid is an edible ink.
6. The label roll of claim 1 , wherein for each label, the directional force is sufficient to rupture the corresponding shell membrane of the heat-resistant capsules when an attempt is made to remove each corresponding label once each label is affixed to a surface by the adhesive coating.