Vegetable fresh-keeping packaging requires full use of various packaging materials during fresh-keeping packaging, and different types of fruits and vegetables have different packaging requirements.
1. Stem and leaf vegetables: These vegetables have crisp tissues, fast dehydration speed, easy to wilt, and their breathing speed is also fast, and they are very sensitive to hypoxia conditions. The moisture resistance, damage resistance and the ability to adjust the ambient gas are mainly considered in the fresh-keeping packaging of vegetables.
2. Hard fruits and vegetables: apples, citrus, peaches, sweet potatoes, carrots, potatoes, onions, yams, beets, radishes and other hard fruits and vegetables, the meat is harder, and the respiration and evaporation are slower than those of soft fruits, which can be kept fresh for a longer time. The preservation requirements of such fruits and vegetables are to create suitable temperature, humidity and ambient atmosphere conditions, which can be packaged in PE and other film packaging, in shallow trays, and packaged by stretching or shrink wrapping.
3. Soft fruits: strawberries, grapes, plums, peaches and other soft fruits, with large water content and soft pulp tissue, are a type of fruit that is not easy to keep fresh. This type of fruit requires that the packaging should have anti-pressure, shock-proof and impact-proof properties, and the packaging materials should have appropriate water vapor and oxygen transmission rates to avoid water mist, condensation and oxygen-deficient damage inside the packaging, and semi-rigid containers can be used. Covered with cellophane, cellulose acetate, polystyrene and other film materials.
Fruits and vegetables are perishable products. In order to overcome the contradiction between seasonal production and balanced supply, storage and preservation technology is a necessary and effective way. In the past many years, domestic scientific researchers have done a lot of work in fruit and vegetable refrigeration, controlled atmosphere storage, preservatives, cold chain transportation, etc., which has gradually diversified the fruit and vegetable storage and consumption market.
