Processing fresh-keeping Film with waste Silk

The Japanese Institute of Silk insect Agricultural Technology has carried out the research on the development of silk fibrogenesis and silk paper for packaging. Their fresh-keeping films for fruits and vegetables based on silk have indeed achieved certain results. They take the lower cocoon or waste silk which cannot be reeled as raw materials, through the processes of cocoon cooking and reducing treatment, then expand the cocoon layer into silk by hand, and then cut off the silk fiber after meticulous slapping to make silk pulp equivalent to papermaking raw materials. it is mixed with special regenerated cellulose to make a composite fresh-keeping film of silk and recycled cellulose in the way of processing and paper (Japanese paper). The characteristics of this fresh-keeping material are: high strength, tensile resistance, through the moisture absorption and release of fruits and vegetables, adjust the environmental humidity, so it can effectively maintain the freshness of agricultural products. According to their test of fresh-keeping effect, the peeled potatoes were packed with silk and recycled cellulose and placed in a room with a temperature of 25 ℃ and a humidity of 21%. The other part of the potatoes were stored in a cold storage with a temperature of 3 ℃ and a humidity of 80%, and the two experimental areas without packaging and newspaper packaging were used as control. After 3 days, the potatoes in the unpacked area blackened completely, and in the experimental area packaged by newspapers, the potatoes began to blacken after 6 days, while the packaging area made of silk and recycled cellulose turned very black, even after 10 days. It was not found that the potato blackened and deteriorated, which had the same effect as that stored in the cold storage. The experimental results show that in order to achieve the best preservation of fruits and vegetables, the oxidation of the products must be eliminated and proper moisture must be maintained. Packaged with silk and recycled cellulose composites, it has better heat preservation in dry environment, and can inhibit water evaporation of fruits and vegetables without drying up. In a humid environment, silk and recycled fiber composites can keep the products moist properly and will not cause too much moisture, so that fruits and vegetables can achieve the best state of neither drying up nor decay.