01 Coolant Introduction
Coolant, as the name suggests, it is a liquid substance used to store cold, it must have the ability to store coldness. There is a substance in nature that is a good coolant, that is water. It is well known that water will freeze in winter when the temperature is below 0 °C. Actually，the freezing process is that liquid water is transformed into solid water in the storage of cold energy. During this process, the temperature of the ice-water mixture will remain at 0°C until the water completely changes into ice, at which time the cold storage of water ends. When the outside temperature of the formed ice is higher than 0°C, the ice will absorb the heat of the environment and gradually dissolve into water. During the process of dissolving, the temperature of the ice-water mixture is always 0°C until the ice is completely melted into water. At this time, the cold energy stored in the water has been released.
In the above process of mutual transformation between ice and water, the temperature of ice water mixture is always at 0 ℃ and will last for a certain time. This is because water is a phase change material at 0 ℃, which is characterized by phase change. The liquid becomes solid (exothermic) , the solid becomes liquid (endothermic), and the temperature will not change for a certain period of time at the phase change point during the phase change (that is, it will continuously absorb or release a large amount of heat within a certain period of time).
The most common application of phase change coolant in our daily life is the "preservation" of fruits, vegetables and fresh food. These food are easy to deteriorate under high ambient temperature. In order to prolong the freshness ，we can use phase change coolant to adjust the ambient temperature to achieve the effect of temperature control and preservation:
02 Application of Cold Coolant
For fruits, vegetables and fresh food requiring 0~8 ℃ cold storage, the coolant ice packs shall be frozen at -7 ℃ for at least 12 hours (to ensure that the coolant ice packs are fully frozen) before distribution. During distribution, the coolant ice packs and food shall be placed in the cooler box together.The use of ice packs depends on the size of the cooler box and the insulation duration. The larger the box is and the longer the insulation duration is, the more ice packs will be used. The general operation process is as follows:
03 Application of Frozen Coolant
For frozen fresh food requiring 0 ℃ cold storage, the refrigerated ice packs shall be frozen at -18 ℃ for at least 12 hours (to ensure that the refrigerated ice packs are fully frozen) before distribution. During distribution, the refrigerated ice packs and food shall be placed in the incubator together.The use of ice packs depends on the size of the cooler box and the insulation duration. The larger the cooler box is and the longer the insulation duration is, the more ice packs will be used. The general operation process is as follows:
04 Coolant Composition & Suggestions for Usage
With the progress of society, people's quality of life is getting higher and higher, and the frequency of online shopping in the Internet era is also increasing. Many fresh and frozen foods are easy to deteriorate in express transportation without "temperature control and preservation". The application of "phase change coolant" has become the best choice. After the fresh and frozen food has been well temperature controlled and kept fresh, people's quality of life has been greatly improved.
With the frequent use of 0 ℃ and frozen ice packs, will the leaking coolant from the rupture of ice packs during transportation pose a threat to food safety? Will it cause harm to human body if ingested without knowing? In response to these problems, we make the following instructions for ice packs:
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Name |
Product |
Materials |
The Third-party Test Reports |
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Cold Ice Pack |
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PE/PA |
Roll film food contact report (Report No. /CTT2005010279CN) Conclusion: According to "GB 4806.7-2016 National Food Safety Standard - Plastic Materials and Products for Food Contact", the total migration, sensory requirements, decolorization test, heavy metal (calculated by lead) and potassium permanganate consumption all meet the national standards. |
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Sodium Polyacrylate |
SGS Oral Toxicity Test Report (Report No./ASH17-031380-01) Conclusion: According to the standard of "GB15193.3-2014 National Food Safety Standard - Acute Oral Toxicity Test", the acute oral LD50 of this sample to ICR mice＞10000mg/kg. According to the acute toxicity classification, it belongs to the actual non-toxic level. |
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Water |
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Frozen Ice Pack |
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PE/PA |
Roll film food contact report (Report No. /CTT2005010279CN) Conclusion: According to "GB 4806.7-2016 National Food Safety Standard - Plastic Materials and Products for Food Contact", the total migration, sensory requirements, decolorization test, heavy metal (calculated by lead) and potassium permanganate consumption all meet the national standards. |
|
Potassium Chloride |
SGS Oral Toxicity Test Report (Report No. /ASH19-050323-01) Conclusion: According to the standard of "GB15193.3-2014 National Food Safety Standard - Acute Oral Toxicity Test", the acute oral LD50 of this sample to ICR mice＞5000mg/kg. According to the acute toxicity classification, it belongs to the actual non-toxic level. |
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CMC |
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Water |
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Remark |
The refrigerated and frozen ice packs have been tested by the national tripartite laboratory: the outer bag is food accessible material, and the inner material is non-toxic material. Suggestions：If the inner material leaks and comes into contact with the food, please rinse it with running tap water. If you accidentally eat a small amount of ice pack inner material, the treatment method is based on the actual situation, if there are no uncomfortable symptoms, such as nausea, vomiting, abdominal pain, diarrhea, etc., you can continue to wait and observe, drink more water to help the ice pack content out of the body; But if there are uncomfortable symptoms, it is recommended to go to the hospital in time for professional medical treatment, and bring ice pack to facilitate treatment. |
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Post time: Jul-01-2022