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What is a tamper-evident seal?

Tamper-evident seals are labels made from special materials and using specialized printing techniques that can indicate whether a product has been opened or tampered with. When someone attempts to tear off or move these labels, they are permanently damaged, leaving a “VOID” mark or an irreparable “torn” pattern, proving that the product has been tampered with. They are commonly used for packaging seals, seals on valuable items, and anti-counterfeiting applications in the electronics and medical industries.

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Core technologies and features of tamper-evident security seal labels:

  1. Physical damage: Uses highly fragile materials, such as fragile paper or special films, that cannot be completely removed after application.
  2. Residual traces: Uses VOID label materials that leave a specific pattern or text (such as VOID, VOIDED) on the object after peeling.
  3. High-tech anti-counterfeiting: Combines laser holographic technology (laser anti-counterfeiting), invisible fluorescent ink, color-changing ink, and high-precision serial number/barcode printing to ensure that the labels cannot be copied.
  4. Peel resistance: Uses high-strength adhesives that withstand chemicals and temperature fluctuations, adapting to various packaging environments.

Application scenarios:

  1. Security sealing: Electrical equipment, confidential documents, and express delivery packaging seals.
  2. Brand anti-counterfeiting: Labels for electronic products, healthcare products, high-end goods, and cosmetics.
  3. Technical calibration: Calibration certificates and equipment warranty labels.

Sealing label printing production process

The printing and production process for anti-counterfeiting labels typically includes: customized design, material preparation, printing, variable data printing (anti-counterfeiting codes), silver coating/scratch-off coating production, die-cutting, quality inspection and defective product removal, and shipping. Roll paper is mainly used for high-speed production, employing technologies such as QR codes and holographic anti-counterfeiting, and finally, quality inspection ensures that the labels remain intact and valid.

Label printing process:

  1. Design and prepress preparation: Design the artwork, separate colors, and prepare printing plates (flexographic, gravure) or print directly (digital printing).
  2. Material selection and printing: Choose paper, PE, PET, PP, etc., depending on the application. Common methods include flexographic printing (transferring ink using an anilox roller), offset printing, or digital printing.
  3. Surface treatment: Apply glossy/matte lamination, hot stamping, spot UV coating, etc., to enhance aesthetics and abrasion resistance.
  4. Die-cutting and slitting: The printed material roll is cut into labels of specific shapes (die-cutting), and the excess material is removed, forming finished rolls.

Sealing process

  1. Product filling: Goods are placed into plastic bags, bottles, or specialized packaging.
  2. Pre-sealing preparation: The sealing area is prepared using robotic arms or manually to ensure it is free of foreign objects and flat, preventing leaks caused by incomplete sealing.
  3. Heat sealing: The sealing machine rapidly heats the specialized packaging material to a specific temperature (usually 150-200℃) to soften the material, and applies uniform pressure through pressing rollers.
  4. Cooling and forming: Brief cooling solidifies the molten plastic layer, forming a strong seal to prevent leakage of the product inside. 

Variable Data Printing/Lamination

  1. Digital printing: Print anti-counterfeiting codes (regular or encrypted) and shipping codes.
  2. Anti-counterfeiting linkage: Ensure the uniqueness of labels and enter them into the database.
  3. Scratch-off layer: Print a silver or black scratch-off layer over the encrypted area to conceal the anti-counterfeiting code and prevent premature scanning.
  4. Die-cutting: Use a die-cutting tool to cut the printed material into predetermined shapes and remove unwanted excess material.
  5. Inspection: Remove labels with unclear codes or defective designs using quality inspection equipment or manually to ensure that all shipped products meet the standards.
  6. Shipping: Cut and package qualified products into the required final format (individual sheets or rolls) and ship them.

Important technical points about seal labeling

  1. Composite materials: Labels and packaging are often made of multiple layers of composite materials, with an inner heat-sealing layer (such as PE, CPP) and an outer printing layer (such as PET, BOPP).
  2. Static electricity control: During high-speed production, static electricity buildup can lead to inaccurate label application and film warping in the sealing area, making the use of static eliminators necessary.
  3. Quality control: Printing defects and seal strength are detected through visual inspection systems.

Classification of anti-tampering labels

Anti-counterfeiting labels are primarily classified according to their technical principles, materials, and presentation formats, including common QR code anti-counterfeiting labels (digital verification), laser anti-counterfeiting labels (three-dimensional images), and fragile paper/VOID anti-counterfeiting labels (single-use). They are widely used in industries such as electronics, consumer chemicals, and food to ensure product uniqueness and authenticity. Detailed explanations of the main types:

Classification by anti-counterfeiting technology/form

  1. QR code anti-counterfeiting labels: Modern and widely used, supporting one code per item, which can be scanned to verify authenticity, including technologies such as color coding, temperature sensitivity, and light sensitivity.
  2. Digital anti-counterfeiting (electronic anti-counterfeiting codes): Scratch off the coating to reveal a unique password, which can be verified by phone, SMS, or website.
  3. Three-dimensional laser anti-counterfeiting (Laser): Uses rainbow three-dimensional laser technology to create vivid images that are difficult to counterfeit.
  4. Special breakable/tearable labels: After being peeled off, they leave behind the words “VOID”, “opened” or become torn, preventing the labels from being reused.

Classification by material and process

  1. Self-adhesive labels: The most commonly used conventional material.
  2. Tearable paper/Tearable self-adhesive labels: Paper that tears easily and is easily damaged when peeled off.
  3. Special substrates: Including PVC, PET, aluminum foil, fiber paper (with anti-counterfeiting patterns), etc.

Classification by functional characteristics

  1. Temperature-sensitive/humidity-sensitive labels: Disappear or change color when exposed to high temperatures or water droplets.
  2. NFC/RFID chip labels: Smart chip sensing technology.

Methods for selecting anti-counterfeiting security seal label printing

The choice of anti-counterfeiting label printing methods should be based on the level of security, cost, and appearance requirements. Common methods include: laser hologram anti-counterfeiting printing (visual anti-counterfeiting), digital barcode/QR code anti-counterfeiting printing (digital tracking), special ink printing (fluorescent, temperature-sensitive color-changing), gravure printing technology (high-security embossed feel), and a combination of multiple processes (such as flat embossing). For high-risk products, priority should be given to complex, high-cost, and unique combined processes.

1. Common anti-counterfeiting label printing technologies

  1. Laser hologram printing creates a barrier film effect: It creates unique visual features through the diffraction of micro-nano structures, such as rainbow effects and 3D effects, making counterfeiting very difficult.
  2. Anti-counterfeiting serial number/QR code printing: Assigns a unique identification code to each label, which can be used with anti-counterfeiting systems for encryption, tracking, and terminal queries.

Special ink printing:

  1. Temperature-sensitive color-changing ink: The color changes with temperature.
  2. Infrared/fluorescent ink: Develops color under ultraviolet light, suitable for high-security requirements.
  3. Gravure printing and combined printing processes: Gravure printing creates a raised, tactile effect, making it suitable for high-end anti-counterfeiting; embossing combines different processes on a single label.

2. Selection criteria

  1. Security level: For products with a high risk of counterfeiting, choose a high security level (laser hologram + spot color ink + serial number); for products with a lower risk, choose a regular QR code.
  2. Brand image: High-end products use materials with good visual effects, such as laser engraving and hot stamping; For daily necessities, focus on ease of scanning.
  3. Cost budget: Combined processes and customized anti-counterfeiting solutions are the most expensive; standard QR codes and digital codes are the most cost-effective.
  4. Application scenarios: For electrical equipment, choose heat-resistant and wear-resistant composite materials; for food, choose environmentally friendly materials.

3. Selection of printing manufacturers

  1. Capability verification: Have official printing certificates and anti-counterfeiting licenses.
  2. Technological innovation: Manufacturers with independent design and research and development capabilities in anti-counterfeiting technology.
  3. Compliance: Ensure the uniqueness, confidentiality and non-duplication of anti-counterfeiting data.

Overall, it is recommended to combine the above anti-counterfeiting methods to achieve the best anti-counterfeiting results.

Tips for preserving tamper-evident security seals

The key to preserving anti-counterfeiting labels lies in sealing, moisture protection, temperature control, and avoiding light exposure. Labels should be stored at room temperature ( 5 degrees C – 30 degrees C), in a dry and well-ventilated environment, away from direct sunlight and cold weather (such as temperatures below 0 degrees C) to prevent damage to the adhesive.

Specific preventive measures for storage:

  1. Sealed storage: Before and after use, anti-counterfeit labels should be sealed in an airtight bag or their original packaging to prevent the adhesive from drying out and losing its effectiveness when exposed to air.
  2. Temperature control: The optimal temperature is usually around . Avoid storing them in environments that are too hot or too cold.
  3. Moisture and water protection: The environment must be dry to prevent moisture from warping the release liner or reducing adhesion.
  4. Light protection: Avoid prolonged exposure to direct sunlight to prevent the label material from aging or fading.
  5. Proper placement: Anti-counterfeit labels should be laid flat and must not be folded or stacked on top of one another to avoid damaging the chip or coating.

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