▎ 摘　　要

NOVELTY - High ductility and high temperature resistant composite food packaging film comprises a modified composite film layer, where the modified composite film layer is soaked by surface wetting solution, coating nano silver solution and forming nano silver antibacterial layer, which is located on the upper and lower sides of modified composite film layer whose thickness is 0.04-0.06 mm, and the thickness of nano-silver antibacterial layer is 0.01-0.02 mm; the modified composite film layer is formed by extruding the film through a screw extrusion molding device, where the modified composite film layer is a base modified film layer, a maleic anhydride graft polyethylene resin film middle layer and a polyethylene outer film layer which are set from bottom to top sequentially. USE - The high ductility and high temperature resistant composite food packaging film is useful for food packaging or food preserving (claimed). ADVANTAGE - The film utilizes a linkage structure, controls the extrusion module to work synchronously, and reduces the usage of driving electric device. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a preparation method of high ductility and high temperature resistant composite food packaging film, comprising (1) extruding the film in screw extrusion forming device to obtain modified composite film layer, (2) soaking the modified composite film layer in the soaking solution at 40-45℃ for 20-30 minutes with a pressure of 5-10 MPa, where the soaking solution is formed by mixing titanic acid ester coupling agent, water and ethanol with a weight ratio of 3-5:2:9-11, and (3) soaking, washing with water, drying, using nano-silver solution with concentration of 3-5 parts/million to coat and forming nano-silver antibacterial layer, preferably high ductility high temperature resistant composite food packaging film; the specific operation of film extrusion comprises (a) pouring the raw materials corresponding to the film structure into the corresponding mixing box, controlling the No. 2 motor to electrify and rotate second motor, driving the stirring shaft and the stirring blade to rotate and stirring the raw material, (b) discharging the stirred raw materials into the extrusion box, adjusting the temperature of each heating area through the temperature adjusting device, converting the raw material into the molten state, using the second electric telescopic rod to drive the stirring shaft to reciprocate in the mixing box, driving the second sealing plate and the collision rod to move back and forth under the collision between roller and the position adjusting plate, driving the position adjusting plate and the driving rod to move back and forth along the vertical direction under the sliding fit between the ball and the spiral groove, driving the screw to rotate, and under the action of the ratchet wheel group, avoiding the reverse rotation of the threaded rod when the drive rod is reset, and performing extrusion work of each layer film structure of the modified composite film layer, (c) extruding the film structure of each layer from the extrusion head and discharging into the shunt channel, finally collecting into the final multi-layer modified composite film layer in the combined cavity, and moving the modified composite film layer along the direction of the rolling roller towards the cooling box, performing the modified composite film layer through the material conveying roller by controlling the fan and the cooler to work, controlling the outside air into the cold air flow and input into the cooling seat and finally spraying to the modified composite film layer, and realizing the cooling process of the modified composite film layer, (d) filtering the air by the filter screen, avoiding the impurity falling on the surface of the modified composite film layer to affect the quality, moving the position adjusting plate from back and forth relative to the mixing box, driving the piston rod to move back and forth along the hollow pipe, repeatedly extruding the air in the piston rod into the cylinder, driving the cylinder to extend, making the cooling seat to move back and forth, improving the cooling effect of the surface of the modified composite film layer, and (e) introducing the starting end of the modified composite film layer into the slot after production, and the receiver cannot receive the laser emitted by the laser emitter, triggering first electric telescopic rod to work and extend, driving the clamping plate to move oppositely to the modified composite film layer for clamping and fixing work, and controlling first motor to rotate by control box, driving the winding roller to rotate the modified composite film layer for rolling work, without the working staff of the starting end of the manual fixing modified composite film layer and the winding modified composite film layer.