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【Packaging Technology】Nylon that is easy to cutEVOH High barrier film and method for producing the same

【Packaging Technology】Nylon that is easy to cutEVOHHigh barrier film and method for producing the samefrom20century90Since the mid-1990s, researchers have begun to focus on the study of transparent high-barrier composite films, which are based onPET,PA,PP,PE,EVOH,PVDCThe production of transparent and high-barrier composite film is carried out through dry lamination, extrusion lamination and other processes, such as coatingPVDCfilm, evaporated oxide film,EVOHFilms such as resin co-extruded films can be composited once or multiple times to obtain a transparent high-barrier composite film.However, a large amount of composite solvent remains in the transparent high-barrier film obtained by dry lamination, extrusion lamination and other processes, which not only causes environmental pollution, but also has high production costs.There is a seven-layer co-extruded transparent high-barrier film and a preparation method thereof that are more environmentally friendly than dry-type composites, and the obtained transparent high-barrier film has better transparency and barrier performance, but the heat-sealing strength of the film is weak, and the packaging production line. It is not easy to be cut off, and it is easy to produce adhesion.In order to have both transparent and high barrier properties, and easy to cut, we have studied a new preparation method.1. Analysis of the planan easily cut nylonEVOHHigh-barrier films, including first contacts in sequential contact and formed by co-extrusionPEfilm layer, first adhesive film layer, firstPAfilm, middleEVOHfilm, secondPAfilm layer, second adhesive film layer, and secondPEfilm layer.the first of whichPEfilm, secondPEThe film layer is composed of metallocene polyethylene, linear polyethylene and high pressure polyethylene, and the mass ratio of the metallocene polyethylene, linear polyethylene and high pressure polyethylene is(45~55):(20~30):(20~30);The first adhesive film layer and the second adhesive film layer are composed of adhesive resin;FirstPAfilm, secondPAMembrane layer consists of polyamide;middleEVOHMembrane layer made of vinyl-Composed of vinyl alcohol copolymer.2. TestThe following is a more specific description of the technical solution in this paper with an example:Examplewill be the firstPEfilm layer, first adhesive film layer, firstPAfilm, middleEVOHfilm, secondPAfilm layer, second adhesive film layer, and secondPEThe material of the film layer is added into the barrel of the seven-layer co-extrusion blown film machine to melt, and after the co-extrusion, the blown film is cooled and shaped to obtain the nylonEVOHhigh barrier film ;the first of whichPEfilm, secondPEThe mass ratio of metallocene polyethylene, linear polyethylene and high pressure polyethylene in the film layer is45:30:30;FirstPEfilm, secondPEThe melt temperature of the film material is200℃, the melt temperature of the material of the first adhesive film layer and the second adhesive film layer is225°C, firstPAfilm, secondPAThe melt temperature of the film material is255°C, middleEVOHThe melt temperature of the film material is225°C. The co-extrusion amount of the material is500kg/h.Nylon obtained by production of the above methodEVOHA first for high barrier filmsPEfilm layer, first adhesive film layer, firstPAfilm, middleEVOHfilm, secondPAfilm layer, second adhesive film layer, and secondPEThe thickness of the film layer is16μm,9μm,6μm,18μm,6μm,9μm,16μm.

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