Method for keeping litchi fresh in room temperature e-commerce logistics

Abstract

The application discloses a method for preserving litchi in e-commerce logistics at normal temperature, which comprises the following steps: (1) fruit picking and sorting: picking litchi fruits in the morning of the delivery day after the dew on the surface of the litchi fruits evaporates, and selecting litchi fruits with consistent maturity, no mechanical damage and no diseases and insect pests; (2) using a composite aluminum foil heat preservation bag as a packaging container, sequentially placing a self-absorbing water lattice ice bag and an absorbing sponge pad from bottom to top; (3) placing the prepared heat preservation bag in a box body of a nuclear pore membrane fresh-keeping box, packing the sorted litchi fruits on the absorbing sponge pad in the bag, and finally covering the box body of the nuclear pore membrane fresh-keeping box with a box cover, and sealing and firmly fixing the box body and the box cover. According to the method of the application, the delivery test is carried out by simulating the e-commerce logistics storage and transportation environment at normal temperature, the fresh-keeping effect is evaluated on the fourth day, and the results show that the litchi fruits are bright in color, and the fruit rot rate is controlled below 5%. Therefore, the method of the application can be used for preserving litchi in e-commerce logistics at normal temperature.

Description

Technical Field

[0001] This invention belongs to the field of fruit and vegetable preservation, specifically relating to a method for preserving lychees at room temperature through e-commerce logistics. Background Technology

[0002] Lychee (Litchi chinensis Sonn.), a highly valuable specialty fruit in tropical and subtropical regions, is favored by consumers for its bright red peel, translucent flesh, and unique flavor. However, lychee undergoes vigorous physiological metabolism after harvest, making it extremely susceptible to deterioration during storage and transportation at room temperature. Its commercial quality typically deteriorates rapidly within 48–72 hours, severely restricting the long-distance sales and international trade development of lychee.

[0003] With the rise of e-commerce sales, lychees are often transported directly from the production area to consumers via express delivery. Traditional e-commerce logistics preservation methods typically use a combination of cardboard boxes, foam boxes, and polyethylene film bags, supplemented by a small amount of ice packs. While this method offers some advantages in terms of single-transaction volume, it has the following significant drawbacks:

[0004] (1) Limitations of packaging materials. Foam boxes, cardboard boxes and other materials have defects in terms of environmental protection, breathability, humidity control and gas exchange. They are difficult to meet the requirements of lychee for a suitable gas environment after harvest respiration, and instead accelerate the aging and decay of the fruit.

[0005] (2) The preservation conditions are limited and the temperature control is poor. Relying only on a small number of ice packs to provide a low-temperature environment has limited heat preservation capacity. The temperature fluctuates greatly during the logistics process, which is not conducive to maintaining the freshness of the fruit.

[0006] (3) Insufficient cushioning and protection. Ordinary foam boxes have high rigidity but limited cushioning performance. During transportation, external impacts are easily transmitted directly to the fruit, causing mechanical damage.

[0007] (4) Although the existing nuclear pore membrane technology has the characteristics of being breathable but not water-permeable, and can provide a certain controlled atmosphere environment for fruits and vegetables, its protective performance is insufficient. It is difficult to maintain low temperature and high humidity conditions while maintaining good gas exchange, which limits its comprehensive application effect in lychee e-commerce logistics.

[0008] Therefore, there is an urgent need for a method to preserve lychees in room-temperature e-commerce logistics that can solve the above problems. Summary of the Invention

[0009] The purpose of this invention is to provide a method for preserving lychees in ambient temperature e-commerce logistics. This method enables lychees shipped under ambient temperature e-commerce logistics storage and transportation environment (25±5 ℃) to maintain good freshness on the 4th day (corresponding to the average longest logistics cycle of domestic intercity express delivery), with bright lychee color and low fruit decay rate.

[0010] The method for preserving lychees in e-commerce logistics at ambient temperature according to the present invention includes the following steps:

[0011] (1) Fruit picking and sorting: On the morning of the day of shipment, after the dew on the surface of the lychee fruit has evaporated, picking begins. Lychee fruits with uniform maturity and no mechanical damage or pests are selected.

[0012] (2) Using composite aluminum foil insulated bags as packaging containers, place self-absorbing grid ice packs and absorbent sponge pads from bottom to top;

[0013] (3) Place the prepared insulated bag inside the pit membrane preservation box, put the sorted lychee fruits into the water-absorbing sponge pad in the bag, and finally cover the box with the lid, sealing and fixing the box and lid firmly.

[0014] Preferably, the composite aluminum foil insulation bag is a pearl cotton composite aluminum foil insulation bag.

[0015] Preferably, the absorbent sponge pad is a medium-density absorbent sponge pad.

[0016] Preferably, the self-absorbing grid ice pack is first soaked in water to fully absorb water and expand, and then placed in a refrigerator to freeze until completely frozen.

[0017] Preferably, the medium-density absorbent sponge pad is a medium-density absorbent sponge pad with a thickness of 3 mm.

[0018] Preferably, sealing and securing the box body and lid is achieved by using plastic tape to seal and secure the box body and lid.

[0019] According to the method of this invention, and simulating a normal temperature e-commerce logistics storage and transportation environment (25±5 ℃), a shipping test was conducted. The preservation effect was evaluated on the 4th day (corresponding to the average longest logistics cycle for domestic intercity express delivery). The results showed that the lychee fruit had a bright color, and the fruit decay rate was controlled below 5%. Therefore, the method of this invention can be used for preserving lychees in normal temperature e-commerce logistics. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to specific embodiments.

[0021] Example

[0022] (1) Fruit picking and sorting: On the morning of the day of shipment, picking begins after the dew on the surface of the lychee fruit has evaporated. Select lychee fruits that are uniformly ripe and free from mechanical damage and pests and diseases, and pick them as needed according to the number of e-commerce orders.

[0023] (2) Preparation of cold insulation, heat insulation, cushioning and moisture retention materials: A 3 mm thick pearl cotton composite aluminum foil insulated bag (purchased from Taobao Hengfeng Insulated Bag Store) was used as the packaging container. From bottom to top, the following were placed in sequence: a 7 cm × 7 cm self-absorbing grid ice pack and a 3 mm thick medium-density absorbent sponge pad (purchased from Taobao Huayi Sponge Products Store). The ice pack needed to be pre-frozen: first, soak the self-absorbing grid ice pack in water for 3–5 minutes to allow it to fully absorb water and expand, then place it in the freezer for at least 6 hours to ensure it is completely frozen. The sponge pad was soaked in water before use to enhance its moisturizing effect.

[0024] (3) Assembly and packaging: Place the prepared insulated bags inside the pit membrane preservation box (provided by Huizhou University). According to the order weight of 5-10 catties, pack the sorted lychee fruits into the medium-density absorbent sponge pads in the bags. Finally, cover the pit membrane preservation box with the lid and use plastic tape to seal and fix the box body and lid firmly.

[0025] A simulated ambient temperature e-commerce logistics storage and transportation environment (25±5 ℃) was used for shipping tests. The preservation effect was evaluated on the 4th day (corresponding to the average longest logistics cycle for domestic intercity express delivery). The results showed that the lychee fruit had a bright color and the fruit decay rate was controlled below 5%.

[0026] Comparative Example

[0027] The difference between the comparative example and the embodiment is that the combination of composite aluminum foil insulated bag + core-pore membrane preservation box was replaced with polyethylene film bag + foam box, and the placement of absorbent sponge was omitted. All other conditions remained unchanged, representing the traditional logistics preservation method. The products were shipped under the same simulated ambient temperature e-commerce logistics storage and transportation environment (25±5 ℃), and the preservation effect was evaluated on the 4th day. The results showed that the lychee fruit had a dull color, and the fruit rot rate was over 30%.

Claims

1. A method for preserving lychees in ambient temperature e-commerce logistics, characterized in that, Includes the following steps: (1) Fruit picking and sorting: On the morning of the day of shipment, after the dew on the surface of the lychee fruit has evaporated, picking begins. Lychee fruits with uniform maturity and no mechanical damage or pests are selected. (2) Using composite aluminum foil insulated bags as packaging containers, place self-absorbing grid ice packs and absorbent sponge pads from bottom to top; (3) Place the prepared insulated bag inside the pit membrane preservation box, put the sorted lychee fruits into the water-absorbing sponge pad in the bag, and finally cover the box with the lid, sealing and fixing the box and lid firmly.

2. The method according to claim 1, characterized in that, The aforementioned composite aluminum foil insulation bag is a pearl cotton composite aluminum foil insulation bag.

3. The method according to claim 1, characterized in that, The absorbent sponge pad mentioned is a medium-density absorbent sponge pad.

4. The method according to claim 1, characterized in that, The self-absorbing grid ice pack is first soaked in water to fully absorb water and expand, and then placed in a refrigerator to freeze until completely frozen.

5. The method according to claim 3, characterized in that, The medium-density absorbent sponge pad is a medium-density absorbent sponge pad with a thickness of 3 mm.

6. The method according to claim 1, characterized in that, The process of sealing and securing the box body and lid together involves using plastic tape to seal and secure them together.