▎ 摘　　要

NOVELTY - Packaging film comprises pineapple leaf fiber, cellulase, nano-magnesium oxide particles, citric acid, nano-cellulose, pullulan, graphene-titanium dioxide material, Mesona chinensis capsule, alfalfa frozen structural proteins, erucic acid, glycerol triacetate, waxy corn cross-linked starch, fucoidan, methyl jasmonate, diethylene glycol and water. USE - As packaging film. ADVANTAGE - The packaging film has excellent quality, stable structure, good stretch-proof and fracture resistance and air permeability. DETAILED DESCRIPTION - Packaging film comprises 125-130 pts. wt. pineapple leaf fiber, 5.8-6 pts. wt. cellulase, 4.3-4.5 pts. wt. nano-magnesium oxide particles, 4.3-4.4 pts. wt. citric acid, 9-10 pts. wt. nano-cellulose, 19-20 pts. wt. pullulan, 5-6 pts. wt. graphene-titanium dioxide material, 11-12 pts. wt. Mesona chinensis capsule, 11-12 pts. wt. alfalfa frozen structural proteins, 3-4 pts. wt. erucic acid, 2.5-3 pts. wt. glycerol triacetate, 18-20 pts. wt. waxy corn cross-linked starch, 8-9 pts. wt. fucoidan, 5-6 pts. wt. methyl jasmonate, 3-4 pts. wt. diethylene glycol and water (suitable amount). An INDEPENDENT CLAIM is included for method for preparing the packaging film, which involves (a) drying pineapple leaf fiber, crushing the pineapple leaf fiber using crusher for 30 minutes to form cotton-like product, adding 4 times citric acid to the product to obtain slurry, heating the slurry at 60 degrees C, performing enzymolysis of the mixture at 100 degrees C for 5 minutes, vacuum-filtering the mixture, washing the mixture using water to obtain purified pineapple leaf fiber, adding nano-magnesia particles to the purified pineapple leaf fiber and 10 times cellulose ionized water to the mixture, homogenizing the mixture at 700 bar for 30 minutes, performing power ultrasonic treatment of the mixture at 1400 W for 50 minutes, performing blasting treatment of the mixture for 5 times, each time for 10 minutes, and obtaining pineapple leaf cellulose solution, (b) mixing mung bean husk nano-cellulose, graphene-titanium dioxide material, jasmine gum and deionized water with 2-3 times water, homogenizing the mixture for 20 minutes, heating and stirring the mixture at 100 degrees C for 30 minutes, spray-drying the mixture, adding 0.5 times deionized water to the mixture, heating the mixture at 100 degrees C for 20 minutes to obtain modified pullulan, (c) mixing products of steps (a) and (b) with other raw materials, heating the mixture at 100 degrees C for 20 minutes, placing the mixture in emulsifier for 40 minutes, performing ultrasonic treatment of the mixture for 16-18 minutes, and drying the mixture at 50-55 degrees C and humidity of 55-60% for 3-4 hours.