Introduction

Canned food is widely popular due to its ability to preserve food for extended periods, ensuring food safety and convenience for consumers. However, the integrity of the metal cans used for packaging is crucial in maintaining food quality. To enhance durability and resistance to external conditions, a coating material is necessary for food packaging cans. The external lacquer plays a vital role in protecting the can from environmental factors that could affect its durability and the quality of the food inside. Additionally, it enhances the aesthetic appeal of the packaging.

1.     Environmental and Health Safety Considerations

External lacquers applied to food cans must be food-safe and compliant with regulatory standards such as those set by the U.S. Food and Drug Administration (FDA) and the European Food Safety Authority (EFSA). These standards ensure that lacquers do not contain harmful substances that could leach into food, such as BPA. With increasing environmental concerns, the canning industry is moving toward using more sustainable external lacquer options that are both effective and environmentally friendly. Research is ongoing to develop biodegradable and non-toxic lacquers that reduce the environmental footprint of canned food packaging [1]

2.     Protection Against Corrosion

External lacquer provides a protective barrier that minimizes direct contact between the metal can and environmental factors like moisture, oxygen, and chemicals that can cause corrosion. When metal corrodes, it not only weakens the can’s structure but also increases the risk of metal particles contaminating the food. Impact of Corrosion on Food Safety: Rust or oxidation can compromise the can’s structural integrity, leading to leaks, cracks, or bulging, which are all signs of potential contamination. By using external lacquer, the risk of corrosion is significantly reduced, thus ensuring food safety [2]

3.     Enhanced Durability in Transportation and Handling [Protection During Handling]

Canned foods undergo extensive handling during manufacturing, shipping, and storage. External lacquer adds a layer of protection, making cans more resistant to abrasions, dents, and other physical damage that can occur along the supply chain. Cans that are lacquered are less likely to develop small cracks or openings that might expose the food to air or bacteria. This is crucial for maintaining shelf stability and preventing foodborne illnesses [3].

4.     Aesthetic Appeal and Marketability [Improved Appearance] 

The external lacquer maintains a can’s appearance by protecting it from fading, scratches, or tarnishing over time. Consumers often associate well-maintained packaging with quality and freshness, making this a key point in product marketing. External lacquer also preserves printed designs and labels on cans, making products more attractive and recognizable on store shelves. Lacquer prevents fading and deterioration of branding, which is essential for market competition calling Brand Visibility [5]. Brand visibility is important because it increases Brand Recognition, Builds Customer Trust and Loyalty, Drives Consumer Engagement, Improves Market Position, and Supports Growth and Expansion.

5. Prevention of Metal Tainting [Barrier Against Interaction]

External lacquer acts as a physical barrier that prevents direct contact between the metal can and food, which is essential in avoiding “metal taint.” Metal taint can lead to a metallic taste in food or discoloration, both of which are undesirable. Types of external lacquer used, such as epoxy, acrylic, and polyester, are used for this purpose. Epoxy coatings, for example, are highly durable and effective but can sometimes raise concerns due to the presence of Bisphenol A (BPA). As a result, acrylic and polyester lacquers are increasingly being explored for their food safety and environmental friendliness [5].

Conclusion

Summarize the critical role of external lacquer in ensuring the safety, longevity, and market appeal of canned food products. UBIS Asia Public Company Limited are ongoing efforts to innovate safer and more environmentally sustainable external lacquer formulations, balancing performance with environmental and health considerations.

References

1. 1. Regulatory Standards: U.S. Food and Drug Administration (FDA) and European Food Safety Authority (EFSA) guidelines on materials in contact with food.
   2. Review on metal packaging: materials, forms, food applications, safety and recyclability
   3. 18 – Packaging technology and food quality
   4. Can coatings for foods and beverages: issues and options
   5. Food and beverage can coatings: A review on chemical analysis, migration, and risk assessment