Comprehensive Solutions for Adhesive Labels in Low-Temperature Environments
With the arrival of winter, Christmas, New Year's Day, and the Spring Festival come one after another. In the celebration of these festivals, exquisite packaging and eye-catching adhesive labels are indispensable elements. However, low-temperature environments pose severe challenges to the materials, processing, labeling, and storage of adhesive labels. To ensure that labels can still function properly in the cold winter, we need to delve into these issues and propose effective optimization solutions.

Problems Faced by Adhesive Labels in Low-Temperature Environments

A. Material Issues
1.  Curling Phenomenon: Under low-temperature conditions, the air humidity is usually low. This low-humidity environment can cause the fibers of the adhesive label's substrate to lose water and shrink. Particularly when the label's substrate is a combination of film and glassine (a commonly used release paper), the deformation of the substrate and surface material is not synchronized, which can easily lead to curling problems. For example, a label that was originally flat may curl up at the edges like a piece of paper in a low-temperature environment, affecting subsequent processing and labeling operations.
2.  Static Electricity Accumulation: The dry winter climate makes static electricity problems particularly prominent. Static electricity generated by friction can attract dust in the air, which not only interferes with the printing process, causing printing defects, but also affects the precision of die-cutting. For example, during die-cutting, static electricity may cause the label material to adhere to the die-cutting blade, resulting in incomplete die-cutting and affecting the shape and size of the label.

B. Processing Issues

1.  Increased Material Fragility: Low temperatures make adhesive materials more fragile. During die-cutting, the material is prone to breaking, and the waste material lacks flexibility during the waste discharge process, which may lead to substrate tearing or edge cracking. This not only reduces production efficiency but also increases material waste.
2.  Static Electricity Interference: Static electricity interference can also cause dust to accumulate on the material surface, forming white spots in printing, which seriously affects processing stability. For example, during printing, dust attracted by static electricity may clog the printing nozzle, causing unclear printing patterns or even ink interruption.

C. Labeling Issues

1.  Decreased Adhesive Performance: In low-temperature environments, the fluidity of the adhesive decreases, leading to reduced viscosity. Insufficient initial viscosity can cause labels to curl after application. For example, for small-diameter bottles or objects with irregular surfaces, it is difficult to apply labels smoothly, and they are prone to bubbling or wrinkling.
2.  Increased Labeling Difficulty: Small-diameter bottles or irregular surfaces already increase the difficulty of labeling. Uneven pressure distribution or surface contamination further increases the risk of labeling failure. For example, if the surface of the object to be labeled has dust, moisture, or other impurities, the label may not adhere firmly and may even fall off during the labeling process.

D. Storage and Transportation Issues

1.  Incomplete Adhesive Curing: After labeling, products stored and transported in low-temperature environments may not have fully cured adhesive, which can easily lead to label detachment. For example, in cold chain logistics, where products are in low-temperature environments for extended periods, the curing speed of the adhesive slows down, and labels may loosen due to external forces.
2.  Increased Cold Resistance Requirements: Extreme environments such as cold chain logistics place higher demands on the cold resistance of labels. If the cold resistance of the label is insufficient, problems such as label brittleness and cracking may occur, affecting the appearance of the product and the end-user experience.

Technical Optimization Solutions

A. Material Optimization
1.  Low-Temperature Adhesive: Choosing low-temperature adhesive is key to addressing low-temperature challenges. This adhesive, with its special formula, can maintain excellent performance in environments ranging from -10°C to -20°C. Combining it with synthetic paper or thermal paper as the label substrate can significantly enhance the label's adaptability to low-temperature environments. For example, synthetic paper has good flexibility and tear resistance, which can remain stable in low temperatures, while thermal paper can improve adhesion to the adhesive through special coating technology.
2.  Humidity Control: Installing plasma humidifiers in the production workshop to maintain humidity at around 50% can effectively reduce material curling. Plasma humidifiers not only increase the humidity in the air but also reduce static electricity generation through ionization, achieving two goals at once.

B. Processing Optimization

1.  Adjusting Die-Cutting Pressure: During processing, it is necessary to adjust the die-cutting pressure according to the characteristics of the material in low-temperature environments. Combining preheating methods to increase the material's flexibility can improve waste breakage issues. For example, preheating the material before die-cutting to slightly raise its temperature can reduce the risk of material breaking during the die-cutting process.
2.  Static Electricity Elimination Equipment: Installing ion wind equipment or static ropes can neutralize static electricity, reducing dust adhesion and edge defects. Ion wind equipment can generate a large number of ions to neutralize static electricity on the material surface, preventing dust from adhering to the material. In addition, simple re-warming treatment of the material can improve processing adaptability and extensibility, making the material easier to process in low-temperature environments.

C. Labeling Optimization

1.  Environmental Pre-treatment: Before labeling, labels and objects to be labeled should be kept in a warm environment for at least 12 hours. This allows the material's temperature to gradually increase, reducing curling and insufficient adhesion caused by large temperature differences. During the labeling process, using heaters or electric heating plates to increase the ambient temperature can enhance the fluidity and viscosity of the adhesive. For example, raising the labeling environment's temperature to 15°C - 20°C can bring the adhesive's performance to its optimal state.
2.  Labeling Tool Optimization: For complex surfaces, using soft thin-faced materials and segmented elastic steel scraper blades can evenly distribute pressure, reducing the risk of label wrinkling and bubbling. In addition, cleaning or flame treating the surface of the object to be adhered can remove moisture and impurities, increasing surface adhesion. For example, flame treatment can instantly remove organic impurities from the surface of an object, making it cleaner and enhancing the label's adhesion.

D. Storage and Transportation Management Optimization

1.  Extended Curing Time: After labeling, products should be kept in a normal temperature environment for more than 24 hours before entering low-temperature storage or transportation processes to ensure complete adhesive curing. This ensures that labels can still firmly adhere to the surface of objects in low-temperature environments.
2.  Cold-Resistant Material Combination: For products that require long-term low-temperature storage, it is recommended to combine low-temperature adhesive with thermal paper or synthetic paper. This combination can ensure that labels remain stably adhered in extremely low-temperature environments. For example, thermal paper can maintain good flexibility in low temperatures, while low-temperature adhesive can provide sufficient adhesion to prevent labels from falling off in low-temperature environments.

Conclusion

Low-temperature environments pose severe challenges to the performance of adhesive labels. However, through a series of technical means such as material optimization, processing optimization, labeling optimization, and storage and transportation management optimization, we can effectively address these issues. Choosing the right low-temperature adhesive, controlling the humidity of the processing environment, adjusting processing parameters, optimizing labeling tools and environment, and properly managing storage and transportation processes can all significantly improve the performance and reliability of adhesive labels in low-temperature environments. In this way, even in the cold winter, our products can still be presented to consumers with a perfect appearance and reliable labeling, enhancing the market competitiveness and user experience of the products.