How To Keep Food
Warm in Delivery
Temperature is the most critical factor in delivery customer satisfaction. This guide analyzes materials, techniques, and professional solutions to keep food in optimal conditions from the kitchen to the final destination.
The Problem of Temperature Loss
Studies show that food loses between 5°C and 15°C in the first 20 minutes of transport without proper insulation. In cities like Madrid or London, where the average delivery time exceeds 25 minutes, the difference between professional thermal packaging and a generic bag is the difference between a 5-star review and a complaint.
Heat loss occurs in three ways: conduction (direct contact), convection (airflow), and radiation (thermal energy emission). An effective insulation system must address all three.
Insulation Materials: Comparison
Not all insulating materials are equal. The key is in the combination of layers that address the three heat transfer mechanisms:
Reflects up to 97% of thermal radiation. It is the industry standard.
Good conduction insulation, but limited against convection.
Durable and abrasion-resistant exterior. Does not insulate on its own.
Only prevents moisture. Minimal thermal capacity.
Zero thermal insulation. Purely aesthetic value.
The ideal combination is a multi-layer construction: non-woven exterior (durability) + aluminum intermediate layer (radiant barrier) + inner waterproof membrane (liquid and condensation protection).
Packaging Best Practices
Preheat the bag
Storing bags near heat sources helps the food retain its temperature for longer.
Seal correctly
An airtight seal reduces convection. Adhesive strips provide a reliable seal without the need for staples.
Minimize empty space
Air trapped inside the bag acts as a conductor. Choosing the right size for each order is essential.
Separate hot and cold
Never mix hot and cold food in the same bag. Use separate bags for each temperature range.
Preparation time
Prepare the order as close to pickup time as possible. Every minute of waiting reduces perceived quality.
Business Impact
Average increase in positive reviews when improving thermal packaging*
Reduction in temperature-related complaints*
Increase in recurring orders with premium packaging*
* Estimated data based on 2024 delivery sector market analysis.
Related Resources
The ProThermo™ Solution
SvartxLab ProThermo™ bags use exactly this multi-layer construction: non-woven fabric exterior + reflective aluminum insulation + inner waterproof membrane + adhesive sealing strip. ISO:9001 Certification. From 100 units.