Processing system and processing method for manufacturing antibacterial PEVA (polyethylene vinyl acetate) film

Abstract

The invention discloses a processing system for manufacturing an antibacterial PEVA (polyethylene vinyl acetate) film. The processing system comprises a PEVA film which is sequentially connected to a rolling device through a steering roller, a supporting roller, a hot air type oven and a corona unit; a coating roller is arranged below the steering roller; the bottom of the coating roller is soaked into an antibacterial agent emulsion tank; and a submersible mixer is further arranged on the inner part of the antibacterial agent emulsion tank. The invention further discloses a processing method for manufacturing the antibacterial PEVA film, wherein the processing method comprises the following steps: preparing the PEVA film; preparing antibacterial agent emulsion; uniformly coating the prepared antibacterial agent emulsion on the surface of the PEVA film by virtue of the coating roller; drying by utilizing the hot air type oven; and carrying out corona treatment on the dried PEVA film on which the antibacterial agent emulsion coats, thereby expanding the surface area of an antibacterial agent coating. By adopting the technology, the antibacterial agent emulsion uniformly coats on the surface of the PEVA film directly, and the PEVA film is dried and subjected to the corona treatment, so that the processing system has the advantages of being good in antibacterial performance, low in cost, and the like.

Description

technical field [0001] The invention relates to the field of antibacterial technology, in particular to a processing system and a processing method for manufacturing an antibacterial PEVA film. Background technique [0002] With the acceleration of the pace of life and work and the continuous improvement of people's pursuit of food quality, more and more urban white-collar workers choose lunch bags to carry meals to keep food fresh. However, problems such as spillage will inevitably occur during food storage. For ordinary lined lunch bags, the embarrassing situation of liquid seeping out of the bag is very likely to occur; and it is difficult to clean, and the oil, water and other components in the food will help the growth of microorganisms such as bacteria, which will lead to the antibacterial properties of the lunch bag Facing severe challenges. [0003] At present, the inner lining of the lunch bag is mainly composed of aluminum foil film, polyethylene foam cotton, poly...

AI Technical Summary

Problems solved by technology

[0005] First, the antibacterial agent has poor dispersion in the matrix, and there are large particle agglomerations;

[0006] Secondly, the antibacterial mechanism of antibacterial agents such as chitosan, nano-silver oxide, and nano-copper oxide is contact antibacterial. After being extruded by the blending method, the antibacterial agent is wrapped in the matrix and cannot contact with food, resulting in low antibacterial efficiency;

[0007] Finally, this method leads to excessive consumption of antibacterial agents, which is easy to cause waste and high cost

[0008] In addition, there is also a method of coating polyvinylidene chloride modified with titanium dioxide (TiO2) on a polyolefin film to prepare an antibacterial film by using a primer layer. The coating method is coated on the surface of the film to prepare an antibacterial film. The film is relatively simple; however, there are two main problems in this method: in order to strengthen the adhesion between the coating and the substrate, a primer layer needs to be set, resulting in a large film thickness; most of the TiO2 is wrapped by the polyvinylidene chloride coating , no antibacterial effect

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