When it comes to food packaging, disposable Modified Atmosphere Packaging (MAP) plastic trays have become a popular choice for many businesses. As a supplier of these trays, I often get asked about their temperature resistance. In this blog post, I'll delve into the details of what temperature ranges these trays can withstand, how this impacts their use, and why it matters for your food packaging needs.
Understanding Temperature Resistance
Temperature resistance refers to the ability of a material to maintain its physical and chemical properties under different temperature conditions. For disposable MAP plastic trays, this is crucial as they are used to store and transport food at various temperatures, from freezing to moderately high temperatures during cooking or reheating in some cases.
The temperature resistance of our disposable MAP plastic trays depends on the type of plastic used in their manufacturing. Different plastics have different melting points, glass transition temperatures, and thermal expansion coefficients, all of which affect how they perform under varying temperatures.
Types of Plastics Used in Disposable MAP Plastic Trays
Polypropylene (PP)
One of the most common plastics used in our disposable MAP plastic trays is polypropylene. Polypropylene has a relatively high melting point, typically around 160 - 170°C (320 - 338°F). This makes it suitable for applications where the trays may be exposed to moderately high temperatures, such as in a microwave or oven for short periods.
Our Eco - friendly Disposable PP MAP TRAY is made from high - quality polypropylene. It can withstand temperatures up to around 120°C (248°F) without significant deformation, which is ideal for reheating food in a microwave or a conventional oven at a low to medium setting. At the same time, polypropylene also has good low - temperature resistance. It remains flexible and tough even at temperatures as low as - 20°C (- 4°F), making it suitable for freezing food.
Polystyrene (PS)
Polystyrene is another plastic used in some of our disposable MAP plastic trays. General - purpose polystyrene has a lower heat resistance compared to polypropylene. Its glass transition temperature is around 100°C (212°F), and it starts to soften at temperatures above this.
However, high - impact polystyrene (HIPS) is often used in our trays for better performance. HIPS can withstand slightly higher temperatures and is more durable. Our Disposable Plastic Food MAP Frozen Tray made from HIPS can handle freezing temperatures well, down to - 30°C (- 22°F), and can be used for storing frozen food for extended periods. But it is not recommended for high - temperature applications like oven use.
Polyethylene (PE)
Polyethylene comes in different densities, such as low - density polyethylene (LDPE) and high - density polyethylene (HDPE). LDPE has a lower melting point, around 105 - 115°C (221 - 239°F), while HDPE has a higher melting point, around 120 - 130°C (248 - 266°F).
Our MAP Plastic Frozen Fresh Trays made from HDPE offer good low - temperature resistance, suitable for freezing food at - 25°C (- 13°F). They also have decent heat resistance for short - term exposure to moderate temperatures, making them a versatile option for both frozen and mildly heated food applications.
Importance of Temperature Resistance in Food Packaging
Preservation of Food Quality
Proper temperature resistance is essential for preserving the quality of the food inside the trays. If the tray cannot withstand the required temperature, it may deform, crack, or release harmful substances into the food. For example, if a tray used for frozen food cannot handle low temperatures, it may become brittle and break, exposing the food to air and causing freezer burn.
On the other hand, if a tray used for reheating food in a microwave or oven cannot withstand the heat, it may melt or warp, ruining the packaging and potentially the food as well. Maintaining the integrity of the tray ensures that the Modified Atmosphere Packaging remains effective, keeping the food fresh for longer.
Safety
Temperature resistance is also closely related to food safety. Trays that can withstand the appropriate temperatures will not release any harmful chemicals into the food. For example, when using a tray in a microwave or oven, it is crucial that the plastic does not break down and leach chemicals into the food, which could pose a health risk to consumers.
Compatibility with Food Industry Processes
In the food industry, there are various processes that involve different temperatures, such as freezing, refrigeration, cooking, and reheating. Disposable MAP plastic trays need to be compatible with these processes. A tray that can handle a wide range of temperatures provides more flexibility for food manufacturers, distributors, and retailers. They can use the same type of tray for different stages of the food supply chain, from production to storage and finally to the consumer's home.
Factors Affecting Temperature Resistance
Thickness of the Tray
The thickness of the disposable MAP plastic tray also affects its temperature resistance. Thicker trays generally have better heat insulation properties and can withstand higher temperatures without deforming as quickly. For example, a thicker polypropylene tray can hold up better in an oven compared to a thinner one.
Additives
Additives can be added to the plastic during the manufacturing process to improve its temperature resistance. For example, heat - stabilizers can be added to increase the melting point or improve the performance of the plastic at high temperatures. Some additives can also enhance the low - temperature flexibility of the plastic, making it more suitable for freezing applications.
Design of the Tray
The design of the tray can also play a role in its temperature resistance. Trays with a more complex design or thicker walls in certain areas may distribute heat more evenly, reducing the risk of deformation. For example, trays with ribbed or reinforced designs are often more resistant to temperature - related stress.
Testing and Certification
As a responsible supplier, we conduct rigorous testing on our disposable MAP plastic trays to ensure their temperature resistance meets the required standards. We use advanced testing equipment to simulate different temperature conditions, from extreme cold to high heat.
Our trays also go through various certification processes to ensure their safety and performance. For example, they are tested for compliance with food contact regulations, which include requirements for temperature resistance and chemical migration. This gives our customers peace of mind knowing that the trays they are using are of high quality and safe for food packaging.
Conclusion
The temperature resistance of disposable MAP plastic trays is a critical factor that affects their performance, safety, and suitability for different food packaging applications. Our range of trays, including Disposable Plastic Food MAP Frozen Tray, MAP Plastic Frozen Fresh Trays, and Eco - friendly Disposable PP MAP TRAY, are designed to meet a wide range of temperature requirements.
Whether you are a food manufacturer, distributor, or retailer, choosing the right disposable MAP plastic tray with the appropriate temperature resistance is essential for ensuring the quality and safety of your food products. If you are interested in learning more about our products or would like to discuss your specific packaging needs, please feel free to contact us. We are always ready to provide you with the best solutions for your food packaging requirements.
References
- "Plastics for Food Packaging: Properties, Requirements and Trends" by S. V. Joshi and A. S. Rao
- "Handbook of Plastic Materials and Technology" edited by Irvin I. Rubin
- "Food Packaging: Principles and Practice" by Tara H. McHugh and Elizabeth A. Baldwin
