Candy Cocoa Coffee Detergent Flour Furniture
Glass Mineral Metal Tobacco
The test revealed good results as shown in the chart on the left. During 20 days transit duration, the temperature was recorded between 22.20 and 61.70 degree Celsius and Relative Humidity was between 1.30% and 75.90%. The most important fact of our test results - our product succeeded in reducing the Relative Humidity values sufficient to avoid "dew point" from being reached.
This test proved that our Nordic Power Desiccant is effective against humidity problems for confectionary products.
During 70 days duration of transit and storage, the maximum temperature reached was 59.20 degree Celsius and 62.20% for Relative Humidity.
0.45 % of the readings were recorded below the dew point of 23 degree Celsius. This occured because the container was in poor condition. The moisture content on the container floor had exceeded 22%.
In order to obtain the best results when using a desiccant, the container should be inspected carefully, especially for moisture content in the container floor. If it is found to be more than 20%, the container should be rejected. Alternatively, the number of units of desiccant used should be increased.
Several tests have been performed on trial shipments loaded with coffee. On the left is the results of the tests done on 2 (two) different companies with different destinations.
Both showed almost the same result. The maximum Relative Humidity reached was almost 95%. The high Relative Humidity was caused by the low temperature upon arrival at destination port.
Important: It should be note that besides the moisture content of the floor, other factors should be considered for condensation such as inherent moisture content of the product and also the packaging material. In this case it is the jute bags used for packaging coffee beans.
Tests for detergent shipments were carried out and the results are shown on the above chart.
In order to get a better result in using desiccant as humidity absorbent, container ventilations MUST be closed and sealed. Open ventilation in a container will cause the desiccant to rapidly reach its maximum saturation level.
On a long journey (long transit time plus long storage time at final destination), in this case almost 3 months, a desiccant MUST be considered.
Additionally, small desiccant bags should also be placed inside the detergent bags in order to reduce the risk of caking of the detergent.
Above is a chart comparing tests for flour shipment, with and without desiccant.
First test was completed for one container loaded with flour. The result was good with a maximum Relative Humidity of 79%. There are several factors that influence the result, i.e. low moisture content of the product, desiccant usage inside the container and sealing of ventilation holes.
The second test was a comparison of product inside two containers, one using desiccant and the other with no desiccant at all. The results were as follows:
For the container using desiccant. only 3% of the readings recorded showed more than 90% of Relative Humidity. None of readings were higher than 95% of Relative Humidity
For container with no desiccant, more than 50% of the readings recorded were between 90-95% of Relative Humidity. The other 35% of readings taken were higher than 95% of Relative Humidity.
This proved that a desiccant is an important factor in reducing the relative humidity inside a container to a hygroscopic level with a combination of low moisture content of the cargo, packing material and container floor.
Our major customers are in agricultural and industrial products. Furniture companies are amongst them.
Many tests have been carried out for furniture companies. The highest Relative Humidity recorded from all tests done by our company was 97.90%. It was caused by heavy rain while loading. During the rainy season in a tropical country, the number of desiccant units used should be increased because the airborne moisture in this season holds much more water than in the dry season.
In all tests Nordic Power Desiccants was compared to alternative desiccant manufactures. The average Relative Humidity achieved by Nordic was the lowest compared to other desiccants used in the same test. This demonstrates that our product is more efficient than all alternative desiccants tested.
Conclusions of the analysis :
Nordic Power Desiccants is the most effective and efficient product compared to its competitors.
Numbers of units of desiccants used depend on the moisture content of the product, packaging material, wooden dunnage, container floor and also the season prevalent at the time of loading.
In order to reduce Relative Humidity, wooden products should be kiln-dried first.
Ventilation holes of the container MUST be closed and sealed in order to allow the desiccant to achieve its maximum effect.
Glass can be damaged by its environment. A rapid drop in the relative humidity may cause condensation within the glass item. If the moisture remains for long, it may change the chemical structure of the glass and damage its appearance.
One prevention method of reducing the incidence of this problem is by using a desiccant, especially for storage and long transit periods.
Even though the ventilation holes were not sealed during the test, it showed good results as shown on the left chart.
Our analysis shows that the desiccant was not functioning at its optimum level as we can see from its 84.4% maximum Relative Humidity. It was considered high for the good weather condition with no temperature below dew point. If the instructions to close and seal all ventilation holes were followed, maximum Relative Humidity could have been reduced to around 70% and average Relative Humidity could have been maintained between 40-45%.
Several factors that influenced the result. Near perfect waether conditions were prevalent when the containers were shipped, i.e. lowest recorded temperature was 27° C and the dew point at around 18° C; reasonably dry wooden crates with average moisture content of 16% and containers in good condition with average moisture content in the container floor of 14.7%.
Two tests have been performed for an existing customer of Nordic Power Desiccants. The second test showed better result than the first one.
Some factors that contributed to this are:
- Container floor was 2.4% lower than the first one,
- Pallet used was kiln-dried in accordance with Nordic Power Desiccants's recommendation
During shipping, a container may be subjected to travel through a number of climate changes. This can result in the formation of condensation on the metal surfaces.
Several tests had been done to test the effectiveness of our product inside a container. One of them showed traces of water and humidity that reached 100%. Our analysis report showed that it was due to wooden dunnage that was not kiln dried and it held too much water. The second test was carried out following our advice of using kiln-dried wood and the humidity dropped from 95.69% average to 77.37%.
Another test was effected comparing two containers, one with desiccant and another with no desiccant at all. The container with our desiccant product showed 88.10% Relative Humidity and it was 9.6% lower, compared to the container with no desiccant (97.7%).
Desiccant usage MUST be considered to prevent condensation and keep the cargo unspoiled.
Above are the results of several tests completed for containers with tobacco products shipped from Asia to Europe.
We have tested containers with opened ventilation and closed ventilation. Using any kind of desiccants in combination with open ventilation is ineffectual. A ventilated container will try to maintain the same Relative Humidity inside and outside. Humidity always tries to maintain its equilibrium level. If RH outside the container is higher, the air will move to the inner side of the container through ventilation holes. Relative Humidity inside a container is thus very dependent on the outside weather conditions. When it rains one can expect that Relative Humidity will reach 100%.
From all tests we carried out there are some factors that should be considered:
The risk of condensation is higher when a container is ashore, therefore, shipment should be carefully planned in order to reduce the amount of time at the container yard.
Whenever a container is stacked in a container yard, try to arrange for it not to be stacked at the top of a tier as it will be more exposed to the weather conditions than the lower ones.
Protection using cardboard and mum paper should be continued. Packing material should be stored in a dry place because it can easily reach equilibrium moisture content and absorb and release a lot of water.
Keep the moisture content of the product to a very low level so it can be safely transported.
The condition of the container should be carefully checked by closing container doors and observing for leakage inside. The moisture content of container floor should be measured in several places. If it is more than 20%, the container should be rejected.
The number of desiccant units should be based on the size and condition of the container and moisture content of the product.