Fresh seafood modified atmosphere packaging, according to species and freshness, at 0-4 °C temperature preservation period of 15-30 days. The packaging film requires a composite plastic film with high gas barrier properties to maintain the gas concentration in the package. Cooked food products and cooked foods modified atmosphere fresh-keeping packaged baking foods, including cakes, cakes, biscuits, bread, etc., the main component of starch. Corruption caused by bacterial molds, etc., rancid deterioration due to oxidation of fats, aging and hardening of the starch molecular structure, etc. cause deterioration of foods.

Is the main antibacterial component in the protective gas; O2 has the effect of inhibiting the growth and reproduction of most anaerobic spoilage bacteria, maintaining the color of fresh meat and maintaining aerobic respiration of fresh fruits and vegetables, and maintaining freshness; In line with dietary requirements, cutting tools should be sharp. Raw material harvesting, inspection, pretreatment, cutting (block, silk, small, etc.) → cleaning → draining → preserving (browning or sterilizing) → packaging → storage and transportation → selling Not all vegetables are suitable for net vegetable processing. The plastic wrap can keep the citrus fresh for 3 months and keep the litchi fresh for more than 30 days. Leaf vegetables: Use "paper" to retain vegetable moisture.

Pre-cooling method (1) Pre-cooling with crushed ice The crushed ice cubes are sprinkled on the garden product or placed in a water-resistant container together with the product, and the contact area with the garden product is enlarged to increase the heat absorption effect. From the perspective of the logistics of clean vegetables, it is divided into three parts: production area, sales area, and connection area for production and sales. The production areas include the harvesting of fruits and vegetables and the post-harvest commercialization (selection, grading, refurbishment and refrigerated containers, ship refrigerated transport, and aviation refrigerated transport. Refrigerated containers are the last link in the cold chain.

Rapid evaporation of product surface moisture, resulting in rapid decline in product temperature. Suitable for leafy vegetables, and some stems and cauliflowers. Table 1. Comparison of pre-cooling methods: pre-cooling method Automatically modified atmosphere packaging machine / semi-automatic atmosphere-conditioning packaging machine can also peel the garlic, process it into garlic and seal it and put it into the refrigerator for refrigerating. It can be used for about 2 weeks. The ginger is divided into old ginger and tender ginger. The ginger is not suitable for refrigerated storage. It can be placed in ventilated place and in sandy soil. The tender ginger is wrapped in plastic wrap and stored in the refrigerator.