Anti-Fog Plastic Packaging – A “Consumer-Catching” Solution

In the food retail industry, packaging transparency is just as important as product quality. Today’s consumers want to clearly see the food they buy – from color and freshness to presentation on the supermarket shelf. However, fogging often occurs when high-moisture foods (such as meat, fish, sushi, and fruits) are stored in cold conditions, causing the plastic tray surface to become cloudy and reducing the product’s visual appeal.

To address this issue, anti-fog plastic packaging technology has emerged and quickly become a standard in food packaging. Not only does it provide a clear, attractive view for customers, but it also helps supermarkets reduce waste, boost sales, and comply with international standards.

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Most Hưng Dụ products are equipped with anti-fog technology.

1. Anti-Fog: Definition and How It Works

1.1. Definition

Anti-fog is a technology applied in plastic packaging production to prevent water vapor from condensing on the surface of trays or films during cold storage. This phenomenon is common in high-moisture foods such as meat, fish, sushi, or fruits. Without treatment, the packaging surface becomes cloudy, obscuring the product and reducing its visual appeal to consumers.

Anti-fog works through special additives either mixed into the plastic material or coated on the packaging surface. These additives modify the surface properties of the plastic, allowing water vapor to spread evenly instead of forming tiny droplets. As a result, the packaging surface remains transparent, clearly displaying the product inside.

1.2. How It Works

• Without anti-fog: Water vapor from the food condenses into small droplets when exposed to cold. These droplets act like mini-lenses, scattering light and creating a white foggy appearance, making the product difficult to see.

• With anti-fog: Additives alter the surface tension, causing the water to spread as a thin, transparent film. Light passes through easily, keeping the product visible and clear.

This mechanism is particularly useful in supermarkets, where refrigerators are frequently opened, humidity is high, and cold air continuously circulates over the food. Anti-fog ensures the packaging remains transparent throughout the storage cycle.

1.3. Types of Anti-Fog

• Internal anti-fog: Additives are mixed directly into PET or PP pellets before processing. Advantages: Long-lasting, effective for extended display periods.

• External anti-fog: A thin coating is applied to the tray or topseal film after forming. Advantages: Lower cost, easy to implement, but may lose effectiveness after 5–7 days of use.

1.4. Safety

According to FDA (2021), anti-fog additives are classified as Food Contact Substances (FCS), meaning they are safe for direct contact with food. Common additives include ester or glycerol derivatives, which have been tested and proven non-toxic when used in food packaging (FDA.gov).

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2. Production Process of Anti-Fog Plastic Packaging

2.1. Raw Materials

To manufacture anti-fog plastic packaging, companies typically use PET (Polyethylene Terephthalate) or PP (Polypropylene) – both FDA (USA) and EFSA (EU) approved for food contact.

In addition to the plastic resin, the anti-fog additive is a critical component. Commonly derived from esters, glycerol, or sorbitan esters, these additives have moisture-absorbing and water-dispersing properties. It is essential that the additives are listed as Food Contact Substances (FCS) under FDA and EU 10/2011 regulations to ensure safety for direct contact with food (FDA.gov).

2.2. Main Production Steps

1. Preparation and Mixing of Additives

• Internal anti-fog: Additives are directly blended into the resin pellets using a hot or cold mixer before entering the production line.

• External anti-fog: Additives are dissolved in a solvent, ready for the surface coating stage.

2. Thermoforming (Shaping Process)

• Plastic pellets are extruded into sheets, heated, and vacuum-formed into trays or containers.

• For sushi boxes or meat trays, this stage determines mechanical strength, transparency, and resistance to cracking.

3. Surface Coating (External Anti-Fog)

• For external solutions, the anti-fog solution is evenly coated onto the tray or film surface.

• The coating must be uniform and free of streaks to maintain long-lasting anti-fog performance.

4. Cooling and Packaging

• After forming, products are quickly cooled to stabilize their shape, then packaged and stored in clean conditions to prevent contamination.

2.3. Supporting Technologies

• Co-extrusion: Combines PET/PP with an EVOH layer to provide both anti-fog properties and enhanced gas barrier, extending food shelf life.

• Nano-coating: Ultra-thin coatings at the nano scale improve water vapor dispersion and prolong anti-fog performance.

• Topseal & Skin Pack Compatibility: Trays are designed to work seamlessly with sealing films, ensuring anti-fog effectiveness is not compromised.

2.4. Quality Control

Produced items undergo strict testing:

• Light Transmittance: Measures transparency after 24–72 hours of cold storage.

• Migration Test: Follows EU 10/2011 and FDA 21 CFR standards to ensure additives do not exceed safety limits.

• Practical Testing: Trays containing meat or fish are stored at 0–4°C for 3–7 days to assess anti-fog performance in real conditions.

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A study published on ScienceDirect (2022) found that anti-fog coatings made from natural polysaccharides can maintain their effectiveness for up to 14 days of cold storage, opening a new direction for biodegradable packaging (ScienceDirect).

Hưng Dụ’s Anti-Fog Plastic Packaging Products

3. Practical Applications in the Food Industry

Anti-fog technology is not just a minor packaging improvement; it has become a mandatory standard for many fresh food products. In supermarkets, customers typically make purchase decisions within the first 3–5 seconds of viewing a product. If meat trays, sushi boxes, or fruit containers appear foggy, sales opportunities drop significantly. This is why an increasing number of retailers and food producers adopt PET/PP anti-fog packaging.

3.1. Meat and Seafood

Beef, chicken, salmon, and fresh shrimp have high moisture content, which often causes fogging during cold storage. Anti-fog trays prevent condensation from forming droplets, allowing water vapor to spread evenly and keeping the product clearly visible.

According to the Food Marketing Institute (FMI, 2022), 64% of consumers prefer transparent packaging, meaning they can clearly see the product inside (GroceryDive). This demonstrates that anti-fog technology directly impacts sales performance.

3.2. Sushi and Ready-to-Eat Meals

Sushi is highly sensitive to aesthetics and presentation. Customers choose sushi not only for taste but also for visual appeal. PET anti-fog containers maintain transparency throughout display periods, even in refrigerated shelves in supermarkets or convenience stores.

In Japan, major retailers like 7-Eleven Japan and Lawson have fully switched to PET sushi containers with anti-fog coating to ensure products always look attractive. This has contributed to stable growth in pre-packaged sushi sales in the domestic market.

3.3. Fresh Fruits and Exported Vegetables

Premium fruits such as cherries, blueberries, US grapes, or pre-cut mangoes exported to the EU and Japan are required to use transparent, anti-fog plastic packaging. Customers want to see the freshness clearly, while the natural moisture of fruits can easily fog the trays.

According to Euromonitor (2024), the sustainable packaging market for fresh fruits is growing 10–12% per year, with anti-fog technology being a key solution to meet this demand.

3.4. Benefits for Supermarkets, Consumers, and Manufacturers

• Supermarkets: Products are displayed clearly, increasing sales and reducing inventory losses due to hesitant customers.

• Consumers: Directly observe product quality, ensuring transparency and hygiene.

• Manufacturers: Enhance brand image, comply with export standards, and expand market reach.

Category: Anti-Fog PET Sushi Trays

 

4. Trends and Challenges by 2025

4.1. Development Trends

• Integration with MAP and Skin Pack Technology
  Anti-fog technology will increasingly be combined with top seal or skin pack films, extending shelf life by 3–5 days compared to conventional packaging. This approach is already adopted by many European retailers to reduce food waste.

• Use of Biobased Additives
  Recent studies show that anti-fog additives derived from polysaccharides or plant proteins provide long-lasting fog resistance and are safer. A study published on ScienceDirect (2022) found that natural polysaccharide-based anti-fog coatings remain effective for up to 14 days of cold storage.(ScienceDirect).

• Higher Recycled Content (rPET, rPP)
  Due to the EU Plastic Tax, producers must use at least 25–30% recycled material in packaging from 2025 onward. This drives research to integrate anti-fog additives in rPET/rPP while maintaining stability.

• Smart Packaging
  Some companies are experimenting with anti-fog packaging combined with freshness indicators or color sensors. Transparent anti-fog packaging enhances the functionality of these smart indicators for consumers.

4.2. Challenges for Businesses

• High Production Cost
  Anti-fog additives can increase tray costs by 10–15%, which is a challenge for smaller producers competing with low-cost suppliers.

• Limited Coating Lifespan
  External (surface) coatings typically last 5–7 days, insufficient for long export logistics chains to EU or the US.

• Strict Certification Requirements
  Import markets require full documentation: FDA (USA), EU 10/2011, ISO 22000/HACCP. Migration testing is costly, discouraging small businesses.

• Technology Gap
  Many Vietnamese packaging companies still produce basic PET/PP trays and have not mastered nano-coating or multi-layer co-extrusion with anti-fog functionality.

Catalogue: Anti-Fog Packaging 2025
Contact us for PET/PP anti-fog tray quotation

Conclusion

Anti-fog technology is now essential in enhancing the value of fresh food products. From meat trays and sushi boxes to fruit export packaging, it ensures transparent packaging, delivering a clear and appealing shopping experience. Beyond aesthetics, anti-fog reduces food waste, extends shelf life, and enhances supermarket brand reputation.

With increasingly strict environmental regulations and international standards, Vietnamese businesses must proactively invest in PET/PP packaging with anti-fog additives, compliant with FDA, EU, and ISO 22000 certifications. This is a key competitive advantage for both domestic and export markets including the US, EU, and Japan.

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