Modified Atmosphere Packaging (MAP) is crucial for preserving the freshness of food products. For manufacturers of food-grade trays, selecting the right barrier materials is vital for ensuring the longevity of perishable goods. Common user queries include the types of materials used, their barriers to gases, and their effectiveness in maintaining quality. The most effective barrier trays utilize materials like polyethylene, polypropylene, and ethylene vinyl alcohol, which work together to create an optimal package.
Polyethylene (PE) is a primary component in food packaging. With its strong sealing capabilities, PE is commonly used as a base layer in barrier trays.
Advantages: Low cost, excellent flexibility
Disadvantages: Limited gas barrier properties
Polypropylene (PP) provides better clarity and strength compared to PE. This makes it ideal for products where visibility is important.
Advantages: Higher temperature resistance and better gas barrier
Disadvantages: More expensive than PE
EVOH is a high-barrier material that is crucial for MAP trays. It offers superior oxygen barrier properties, making it ideal for extending shelf life.
Advantages: Excellent gas barrier properties
Disadvantages: Costly and sensitive to moisture
According to industry studies, the combination of PE, PP, and EVOH can increase the shelf life of packaged food by more than 90%. Here’s a brief comparison of these materials:
| Material | Cost | Gas Barrier Property | Flexibility |
|---|---|---|---|
| Polyethylene (PE) | Low | Moderate | High |
| Polypropylene (PP) | Medium | High | Moderate |
| Ethylene Vinyl Alcohol (EVOH) | High | Very High | Low |
Choosing the right materials for MAP barrier trays is essential for maintaining food freshness. PE, PP, and EVOH each play critical roles in the effectiveness of food packaging. Understanding the advantages and disadvantages of these materials will help manufacturers make informed decisions, leading to higher quality products and satisfied customers.
