Common Problems and Solutions for Self-Adhesive Labels: 6 Must-Know Tips
Self-adhesive labels may encounter various issues during production and use, such as label curling, falling off, blurry printing, and adhesive residue. These problems can affect their appearance and functionality. Here are some common issues and solutions to help you out.

I. Label Curling or Rolling After Application

Causes
•  Environmental Conditions: Significant changes in temperature and humidity can cause different contraction rates between the face material and adhesive, leading to edge lifting.
•  Surface Irregularities: If the surface to be labeled is uneven or has oil, it can affect the adhesive's bonding strength.
•  Improper Cutting: Inaccurate label cutting or overly deep die-cutting can cause uneven force on the edges.
•  Insufficient Initial Adhesion: Particularly noticeable in low-temperature environments.
Solutions
•  Choose adhesive types suitable for current environmental conditions (e.g., cold-resistant or heat-resistant adhesives).
•  Ensure the surface to be labeled is clean, dry, and free of oil.
•  Maintain storage and usage environments within recommended temperature (15–25℃) and humidity (40–60%) ranges.
•  Replace with adhesive formulas that have stronger initial adhesion or increase labeling pressure.

II. Label Falling Off After Application

Causes
•  Material Incompatibility: Adhesive may not match the material to be labeled (e.g., PP, PE, which are low-surface-energy materials).
•  Insufficient Pressing: If the label is not fully pressed down after application, the adhesive may not fully wet the surface.
•  Harsh Environments: Long-term exposure to high temperatures, humidity, or chemicals.
Solutions
•  Select specialized adhesives for different materials (e.g., modified acrylic adhesive for plastics, rubber-based adhesive for metals).
•  Use a roller or labeling machine to fully press down the label after application.
•  For special materials (e.g., PP/PE), consider corona treatment or the use of a primer to enhance adhesion.
•  Choose industrial-grade label materials with strong weather resistance for extreme environments.

III. Blurry, Broken Lines, or Wrinkled Ribbon in Printed Content

Causes (Mainly for Thermal Transfer/Thermal Printing)
•  Incorrect Printer Settings: Improper print head pressure or temperature settings.
•  Mismatch Between Ribbon and Label Material: The ribbon is not compatible with the label material.
•  Dirty or Worn Print Head: The print head is dirty or worn out.
•  Incompatible Surface Coating: The label's surface coating is not suitable for printing.
Solutions
•  Adjust the print temperature and pressure to the recommended parameter range.
•  Choose the right ribbon type (wax-based, wax-resin-based, or resin-based) that matches the label material.
•  Regularly clean the print head and replace it if it is worn out.
•  Select label materials with optimized coatings for printing (e.g., matte silver, coated paper, synthetic paper).

IV. Adhesive Residue After Label Removal

Causes
•  Permanent Adhesive for Temporary Use: Using permanent adhesive when removable adhesive is needed.
•  Increased Adhesive Flow: In high temperatures, adhesive can flow more easily and seep into the micro-pores of the surface.
•  Improper Removal Method: Rapid and forceful removal can leave adhesive behind.
Solutions
•  Choose removable adhesive or low-residue adhesive based on the usage scenario.
•  Avoid using permanent adhesive labels for extended periods in high temperatures.
•  Remove the label slowly and parallel to the surface to minimize adhesive breakage.
•  If adhesive residue remains, clean it with alcohol, a specialized adhesive remover, or an eraser.

V. Label Jamming, Skewing, or Failure to Dispense in Automatic Labeling Machines

Causes
•  Inconsistent Tension or Rough Edges: Uneven tension or rough edges in the label backing paper.
•  Inconsistent Silicone Coating: Uneven silicone coating on the backing paper can lead to abnormal release force.
•  Improper Machine Settings: The labeling machine's parameters (e.g., feed speed, sensor sensitivity) are not properly calibrated.
•  Improperly Wound Label Roll: The label roll is wound too loosely or too tightly.
Solutions
•  Purchase high-quality labels from reliable suppliers to ensure smooth backing paper and precise die-cutting.
•  Check the release force of the labels to ensure it meets the machine's requirements (typically 80–300g/in is suitable).
•  Regularly maintain the labeling machine and calibrate the sensors and feed rollers.
•  Store labels properly to avoid moisture, direct sunlight, or heavy pressure that can deform them.

VI. Label Discoloration, Fading, or Aging

Causes
•  Material or Ink Sensitivity: Face material or ink is not resistant to UV light, high temperatures, or chemical corrosion.
•  Long-Term Outdoor Use: Failure to select weather-resistant materials for outdoor applications.
Solutions
•  For outdoor use, choose UV-resistant face materials (e.g., PET, synthetic paper) and UV-resistant inks.
•  In chemical environments, use labels with coatings that are resistant to solvents and acids/bases.
•  Consider adding a transparent protective film (e.g., glossy or matte film) to extend the label's lifespan.