1. Basic Principles of Insulation Materials

The primary function of insulation materials is to isolate external temperatures and reduce heat transfer. This is achieved through the material's low thermal conductivity and high reflectivity, ensuring a constant temperature for the contents inside the bag.

2. Common Insulation Materials

• Reflective Aluminum Foil: A highly reflective material capable of reflecting most thermal radiation, commonly used for cooling in summer or insulation in winter.

• EVA Foam: Known for its excellent insulation properties and low thermal conductivity, it's one of the most commonly used insulation materials in cooler bags.

• Polyurethane Foam: Similar to EVA foam but with higher insulation properties, suitable for long-term insulation needs.

3. Selection of Insulation Materials

The choice of appropriate insulation material depends on the specific application of the cooler bag. For short trips or daily commuting, reflective aluminum foil or EVA foam might be ideal. For longer trips or camping, polyurethane foam may be more suitable due to its extended insulation capabilities.

4. Application Techniques of Insulation Materials

• Material Thickness: Increasing the thickness of the insulation material can enhance its insulating effect, but it may also add to the weight and volume of the cooler bag.

• Multi-layer Structure: Combining different insulation materials can achieve better insulation results. For instance, using reflective aluminum foil on the outer layer and EVA foam on the inner layer.

• Tight Sealing: Ensure the opening of the cooler bag is tightly sealed to prevent the entry of external hot air.