Tamper-evident Seal Design and Printing

What Is a Tamper-evident Seal?

A seal is a strip that binds the closure of a package to its body, so opening it requires cutting or tearing the seal — leaving an irreversible mark of that intervention.

How It Differs from a Normal Label

A normal label adheres to one surface. A seal bonds two surfaces together — lid to body, or the two flaps of a carton. Its function comes from that bond; a seal applied to a single surface serves no purpose.

What a Seal Should Carry

• Unique serial number: without it the seal is only a physical closure and cannot be traced.
• QR code: the digital counterpart of the number, enabling verification.
• Brand identity: an additional barrier for counterfeiters.
• Tear notch: controls where the seal breaks.
• Security feature: VOID structure, fragile material or a holographic strip.

Why Numbering Is Critical

A seal's real strength comes from a known production quantity. If you produced 20,000 seals, no 20,001st seal should exist in the field. Reserving ranges per dealer or shipment also identifies which channel a given seal came from.

QR Placement

The QR must not sit on the tear line. When the package is opened the seal is cut; a code at the break point becomes unreadable. Keep it clear of the tear notch.

Production Parameters

Circumference and overlap, material (fragile paper shows opening clearly; PP and PET are more durable), numbering scheme, QR size — at least 15 mm — tear control, adhesive matched to the surface, and roll or sheet format depending on whether application is manual or automated.