What are the cold storage preservation methods for chestnuts?

The cold storage preservation method for chestnuts is a comprehensive technical process, which aims to maintain the quality and taste of chestnuts and extend their shelf life. The following is a detailed description of the main methods and steps of chestnut cold storage preservation from a professional perspective:

　　1. Early picking and sorting

Picking method: It is recommended to use the natural fruit drop method, that is, wait for the chestnuts to fall naturally after they mature and then pick them up. The chestnut meat harvested by this method is full and full, and it is resistant to storage. If you need to harvest quickly, you can choose to use a wooden pole or bamboo pole to gently knock it down when most of the chestnut pods turn yellow-brown and some crack.

Sorting and processing: After picking chestnuts, the outer layer of chestnut pods must be removed, and bad, mixed fruits, cracked and other defective products must be removed. After that, they are graded according to size, quality, etc. for subsequent management and storage.

　　2. Pre-cooling treatment

Timely pre-cooling: Freshly picked chestnuts should not be directly stored, and timely pre-cooling treatment is required. Precooling can help reduce the respiration of chestnuts and reduce losses in later storage. The precooling temperature is generally controlled at -2℃ to -1℃, and the relative humidity is maintained between 85% and 95%.

Packaging method: chestnuts after precooling should be packed in two layers, inner and outer. Non-toxic polyvinyl chloride plastic bags are often used for inner packaging to reduce the loss of water in the fruit itself; cartons or wooden boxes are selected for outer packaging. After packing, the boxes should not be placed too high, and there should be gaps between the boxes to ensure the circulation of cold air.

　　3. Cold storage preparation and disinfection

Cold storage disinfection: Before chestnuts are stored, the cold storage needs to be fully disinfected to kill bacteria, viruses and other microorganisms in the storage to ensure the sanitary quality of chestnuts.

Precooling warehouse: At the same time, the cold storage is precooled to reduce the temperature of the warehouse to a suitable storage temperature to create good conditions for the preservation and storage of chestnuts.

　　4. Storage and stacking

Storage in batches: chestnuts should be stored in batches. Before each batch is stored, it is necessary to ensure that the chestnut temperature meets the requirements to avoid affecting the overall refrigeration effect.

Reasonable stacking: When stacking, sleepers and sacks are generally used to ensure that there is enough distance between the upper and lower sacks to facilitate ventilation and heat dissipation. The stacking height is generally controlled between 3 and 6 bags to avoid poor ventilation due to excessive height.

　　5. Storage management

Temperature and humidity control: During storage, the temperature and humidity in the cold storage should be checked regularly to ensure that the temperature is maintained at -2℃ to -1℃ and the relative humidity is maintained between 85% and 90%. If the storage is too dry, spray humidification and other methods can be used to adjust it.

Ventilation: Regular ventilation is also key, especially in the morning when the temperature is lower, to slow down the temperature rise and keep the air in the storage fresh.

　6. Regular inspection and delivery

Quality inspection: During storage, the quality of chestnuts needs to be checked regularly, and spoiled chestnuts need to be discovered and handled in time to prevent infection of other fruits.

Timely delivery: According to market demand and chestnut storage conditions, storage should be terminated in a timely manner, and delivery should be made in time to ensure commodity value and economic benefits.

In summary, the cold storage preservation method of chestnuts involves multiple links such as early picking and sorting, pre-cooling treatment, cold storage preparation and disinfection, storage and stacking, storage management, regular inspection and delivery. Through scientific management and meticulous operation, the preservation effect of chestnuts can be significantly improved, the storage period can be extended, and market demand can be met. If you have any questions about the chestnut cold storage preservation method, the engineers of Shanghai Haocool Industrial Co., Ltd. are on call to answer. Haocool Refrigeration, a one-stop cold storage expert, provides all-round services from design to after-sales. Get a detailed cold storage plan and quotation list for free to help build cold storage in the food, medicine, cold chain, chemical and other industries.