Sorb-Plus / Founded in 1998

Preliminary judgment of the cause of moisture damage

Factory direct supply | Distributors, wholesalers and dealers wanted.

Many friends contacted “SORB-PLUS” to seek professional moisture damage solutions. Take a customer in the electrical appliance industry as an example. Their main products include air conditioners, refrigerators, washing machines and other household appliances. The problems they encountered are: the same During the time period, for the same goods, the moisture damage from Yangzhou to Mexico was very serious, but not from Qingdao to other countries.

The customer used some desiccants of a certain brand, but still did not solve the trouble of moisture damage, so they found “SORB-PLUS” for help.

Photos of moisture damage

The packaging carton is seriously damp, and the top has been soaked with water, accompanied by mildew. The photo was taken and provided by the Mexican customer of this electrical customer.

Cause of moisture damage

Mildew on the edges of packaging

Photos of cargo loading

The customer’s product packaging is very strong, and the quality of the carton is also good, but there are almost no extra gaps on both sides of the container.

Cargo loading
Cargo loading

They used some desiccants of a certain brand during transportation, the upper half of the desiccants hanging on both sides of the container absorbs moisture, and the lower half is still dry (not saturated with moisture), but the cartons is soaked.

Doubts that need to be resolved

  • Where does the moisture come from?
  • Why is the moisture damage more serious on the route from Yangzhou to Mexico?
  • Why is the top of the carton damp?
  • Why is the container damp, the product is damp, and the desiccant part absorbs moisture, and some is still dry?

The cause of moisture damage

After preliminary judgment, the reasons for the moisture damage of the customer’s product are roughly as follows:

1. Where does the moisture come from?

  • The humidity of the environment when the goods are loaded into the container is too high, which makes the relative humidity of the air stored in the container higher.
  • The water content of the container wood floor is too high, and its safe water content should be ≤15%.
  • The cargo itself has a high water content, and the temperature fluctuates sharply during transportation, and there is a situation of spitting out moisture.
  • The water content of the packaging carton is too high, and the safe water content should be 9%.
  • The container is damaged and seepage, or the container vent is not blocked.

2. Why is the moisture damage more serious on the route from Yangzhou to Mexico?

  • The possible reason is that the temperature fluctuates greatly on the route from Yangzhou to Mexico.The specific reasons need to be further investigated.
  • According to the comparison of weather data, Yangzhou has a subtropical monsoon climate and the annual average relative humidity is relatively high (average 70%-80% from March to September). In the same period, the annual average relative humidity of Qingdao is 50%-70%. It can be seen that the moisture content of the goods sent from Yangzhou, whether it is the product packaging or the container floor, will be greater than that of Qingdao.

3. Why is the top of the carton damp?

Because the water vapor in the air moves from bottom to top, once the temperature drops sharply, the water vapor in the air will condense into liquid water on the top of the container, and then drip onto the cargo packing box, which is called “container rain”. 

Click to learn more about “Container Rain”.

    4. Why is the container damp, the product is damp, and the desiccant part absorbs moisture, and some is still dry?

    • The cargo is loaded too densely, and there are almost no extra gaps on both sides. The desiccant hanging on both sides of the container cannot fully absorb the rising water vapor in time.
    • The amount of desiccant is too small to fully absorb the rising water vapor in time.
    • The moisture absorption performance of other brands of desiccants is not up to standard.

    In response to the above doubts and preliminary judgments, our company sent technicians to the customer’s Yangzhou factory to conduct on-site investigations.

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