In logistics, sweets are a “special care” cargo. Chocolate reacts instantly to temperature fluctuations (white bloom appears), cream fillings in biscuits can change consistency, and delicate wafers will crumble with the slightest mistake in load securing. To ensure the goods reach the consignee in perfect condition, a few iron rules for loading a refrigerated container (reefer) must be followed.

1. Ventilation: The container must “breathe”

A reefer does not only cool – it forces continuous air circulation. If you block the airflow, the internal temperature will no longer be stable, which will damage your product.

The red line – the upper loading limit

In the upper part of every reefer you will see a red line. This is the most important checkpoint for warehouse staff.

• Rule: No carton or pallet may extend above this line.
• Why is it important? Air in a reefer is blown from the floor, passes through the cargo, and must freely return along the ceiling to the cooling unit. If you block the space under the roof, circulation is interrupted.
• Result: So-called “dead zones” will form, where the temperature rises sharply. For chocolate, this means irreversible loss of quality.

T-bar floor – do not cover the gaps

The reefer floor has characteristic aluminum profiles (T-bars). They are a key part of the cooling system.

• Important: Never cover the floor with foil, cardboard, or paper.
• Consequences: Air must flow freely from underneath through the pallets. Covering the floor works like a plug in a pipe – cooling will simply stop being effective, even if the unit is running at full power.

2. Loading method: pallets or floor loading?

The choice of loading method has a huge impact on both safety and temperature control.

• Euro pallets (recommended): The safest solution. Standardized dimensions allow stable stowage, and the pallet structure enables airflow under the cargo.
• Floor loading: Although it allows you to use every centimeter of space, it severely worsens ventilation and prolongs unloading. With fragile products, there is a high risk of crushing the bottom layers under the weight of the entire load.

Expert tip: When loading on pallets, leave a 2-5 cm gap from the side walls. This creates an “air jacket” that insulates the sweets from heat penetrating through the container walls.

3. Securing vs. aerodynamics – how to use airbags?

In reefers, load securing often conflicts with ventilation. Poorly placed dunnage bags can turn the container into a thermos.

The “wall of bags” trap

If you fill all free space with airbags from floor to ceiling, you create an airtight barrier for air. The bags should fill gaps but must not block the T-bar floor channels or touch the ceiling above the red line.

Golden rules for using airbags in reefers:

• Lift the bags off the floor: Place airbags about 10-15 cm above the floor so airflow underneath remains unobstructed while pallets are still stabilized.
• Do not block the “air jacket”: Use airbags between pallets, not between pallets and container walls.
• Smaller bags in strategic points: Instead of one huge bag blocking the entire aisle, use smaller ones at the level of the cargo’s center of gravity.
• Alternatives: For extremely sensitive goods (e.g. pralines), consider honeycomb fillers, which stabilize the load while allowing air to circulate through their structure.

4. Hygiene and protection against odors

Chocolate and products containing vegetable fats absorb surrounding odors like a sponge. Even if packed in outer cartons, long exposure to foreign smells can permanently affect quality.

• Impeccable cleanliness: The reefer must be free of any odors from previous cargoes. If any foreign smell is detected, the container requires additional washing and ozonation.
• No moisture: The interior must be completely dry. Moisture combined with residual odors is the shortest path to customer complaints.

Summary

Transporting sweets requires precision and technical awareness. If you respect the red line, keep the floor airflow unobstructed, and secure pallets wisely without blocking circulation, your cargo will arrive in perfect condition. We have been working in this industry for years and know that these details determine commercial success and the trust of your customers.