Ethylene-vinyl acetate copolymer anti-counterfeiting film and preparation method thereof

Abstract

The invention discloses an ethylene-vinyl acetate copolymer anti-counterfeiting film and a preparation method thereof. The ethylene-vinyl acetate copolymer anti-counterfeiting film includes, by weight, 100 parts of EVA, 0.1-20 parts of anti-counterfeiting masterbatch and 0-3 parts of a processing aid. The anti-counterfeiting masterbatch includes, by weight, 30-99.9% of a carrier resin, 0.01-15% of a fluorescent powder, 0.01-65% of a coding material and 0-3.25% of an auxiliary; and the carrier resin is EVA. The preparation method is as below: conducting extrusion molding on the EVA, processing aid and anti-counterfeiting masterbatch to a coextrusion head by using a large extruder and a small extruder respectively; evenly mixing EVA and the processing aid and extruding from the large extruder; extruding the anti-counterfeiting masterbatch from the small extruder; and extruding a double color bubble tube, and conducting blowing, traction and rolling. By adopting specific coextrusion film blowing process, the anti-counterfeiting strip and the EVA film are combined into one body to gain good binding force; the production process is simple, low in anti-counterfeiting cost, and more easy for processing and moulding and mass production; and according to the fluorescent features and coding information on the anti-counterfeiting strip, authenticity and traceability of the product can be realized.

Description

technical field [0001] The invention relates to the technical field of packaging anti-counterfeiting, in particular to an ethylene-vinyl acetate copolymer anti-counterfeiting film and a preparation method thereof. Background technique [0002] Ethylene-vinyl acetate copolymer (EVA) blown film is an elastic film, which has high elasticity, strong binding force, good word viscosity, non-toxic, high transparency, good cold resistance, and suitable air permeability , so it is an ideal packaging material. [0003] However, it usually does not have anti-counterfeiting function. When it is used in some fields that require anti-counterfeiting, it is necessary to additionally set special anti-counterfeiting marks on the ethylene-vinyl acetate copolymer film, such as printing anti-counterfeiting inks, or pasting anti-counterfeiting labels, etc., which affects The appearance of the product has increased the processing procedure. And because these anti-counterfeiting technologies are ...

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Problems solved by technology

[0003] However, it usually does not have anti-counterfeiting function. When it is used in some fields that require anti-counterfeiting, it is necessary to additionally set special anti-counterfeiting marks on the ethylene-vinyl acetate copolymer film, such as printing anti-counterfeiting inks, or pasting anti-counterfeiting labels, etc., which affects The appearance of the product has increased the processing procedure

And because these anti-counterfeiting technologies are widely used anti-counterfeiting technologies, it is easy for counterfeiters to see, thereby imitating the corresponding anti-counterfeiting marks

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