High barrier coextruded stretch film

Abstract

A high barrier coextruded stretch film is a transparent multilayer film or a multilayer film with printed pictures and text information; the thickness of the film is 0.008-0.150mm; and the film is the multilayer film suitable for printing, recombination, vacuum packaging or gas flushing packaging and can be subjected to secondary heat sealing. The invention particularly relates to a high barrier coextruded longitudinal stretch film which is obtained through the mixing technology assisted by three or more than three layers of resins and the forming methods of blow molding and casting coextruding longitudinal stretch. When the thickness and structure of the film are fixed, the barrier property of the film to gas and steam is increased by 10%-300% through 0.3-12 times of longitudinal stretch; and when the barrier property and structure of the film are fixed, the thickness of the film is reduced by 30%-1200% through 0.3-12 times of longitudinal stretch. The film can be widely used in the sealed flexible packages of products in the fields of agriculture, food, household chemicals, chemical engineering, war industry and the like, printing substrates and various functional packages with the functions of thermal forming, gasing, vacuumizing and the like; and the film is especially suitable for the high barrier applications in various environments.

Description

technical field [0001] The invention relates to a heterogeneous high-barrier co-extruded stretched film, which is a multi-layer film that is transparent or printed with graphic information on the packaged object. The thickness is in the range of 0.008-0.150 mm. A multi-layer film that is packaged or air-filled and can be heat-sealed twice, especially a kind of longitudinal film obtained by the auxiliary blending process of three or more layers of resin, and the molding method of blow molding and casting co-extrusion longitudinal stretching Stretched high barrier coextruded film. The draw ratio is in the range of 0.3 times to 12 times. When the thickness is the same as that of the coextruded film with the same structure, it can be stretched longitudinally in the range of 0.3-12 times. The gas and water vapor barrier properties of the film are improved by 10%-300%. When the gas and water vapor barrier performance is the same as that of the co-extruded film with the same struc...

AI Technical Summary

Problems solved by technology

The aggregation transition temperature transition bridge P utilizes the combination of the three elements of polymer type, thickness, and stretching ratio to make the function and molecular structure of the constituent materials continuous from one side to the other side or from the middle to both sides along the thickness direction. The gradient changes in a gradient, and the difference in the glass transition and melting point temperature of the interlayer polymers is minimized with the continuous gradient of the composition gradient; it solves the problem of multi-layer heterogeneous longitudinal stretching film, due to the glass transition and melting point transition of the materials in each layer The temperature is different. Under the same preheating conditions, the stretching machine can not be stretched to the same multiple in the direction of the external force under the action of the external force. It is impossible to make the molecular chains or crystal planes of different types of polymers parallel to the film. Orientation and orderly arrangement in the direction of the plane; heat setting, cooling and subsequent processing to obtain the ideal plastic film technical problems