Application of twill roller in manufacturing of dull polish laminating film and application method thereof

Abstract

The invention discloses application of a twill roller in manufacturing of a dull polish laminating film and an application method of the twill roller. The method comprises a corona step, a drying step and a coating step by taking the twill roller. The method comprises the specific steps that (a) according to the corona step, corona treatment is carried out on a PET base material through a corona machine; (b) according to the coating step, glue and curing agents are poured into a twill roller glue groove, and the PET base material is coated; (c) according to the drying process, the coated PET base material is dried through an oven and then reeled, and the dull polish laminating film is obtained. A dull polish glue coating manufactured through the method is even, laminated traces, lattice points and longitudinal lines do not exist, no white sediments exist on the surface of the twill roller, the amount of stored glue is large, the adjusting range is wide, and the method is suitable for coating of coatings of different thicknesses.

Description

technical field [0001] The invention relates to a manufacturing process of a card protection film, in particular to the application of a twill roller in the preparation of a frosted card protection film and its application method. Background technique [0002] The protective card film is a high-grade sheet packaging material made of polyester film as the substrate, uniformly coated with adhesive, and then specially processed. It has waterproof, anti-alteration, moisture-proof, insect-proof, and mildew-proof Corrosion resistance and other functions, it is widely used in the sealing and protection of various sheet materials such as ID cards, photos, and credit cards. Frosted card protection film is favored by consumers because of its special light transmission. [0003] In the production process of frosted card protection film, coating is a very critical process. Coating refers to coating the frosted glue on the substrate PET. The frosted card protection film require...

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Problems solved by technology

[0003] In the production process of frosted card protection film, coating is a very critical process. Coating refers to coating the frosted glue on the substrate PET. The frosted card protection film requires that the frosted effect adhesive layer be coated evenly, and at the same time, the light transmittance It needs to be between 5-8, and the peeling strength of the frosted rubber layer should be greater than or equal to 3N. In order to ensure that the peeling strength is qualified, the corona value on the surface of the PET substrate should reach more than 50 dynes; the choice of frosting glue, curing agent, and steel roller Both have an important impact on the uniformity and light transmittance of the frosted glue layer: the frosted glue is a two-component water-based environmental protection matte coating agent, at room temperature PH≈8, viscosity is 100 centipoise, and the solid content is about 30 % milky white liquid, a coating agent that can be used in one step, can provide good transparency and abrasion resistance, and can meet the heat sealing temperature (120°C-175°C) required for the use of the protective card film, correct use There are 10 gloss units at an angle of 60 degrees; according to different needs, the abrasive glue and curing agent are mixed in different proportions, and after being fully stirred, pour into the glue tank with circulation function for use; the steel rod commonly used in the coating process at present It is a mesh roller, which has a uniform amount of glue and can choose different mesh rollers according to the amount of glue to achieve the coating effect. However, due to the characteristics of high viscosity, poor fluidity, high solid content and easy oxidation of the abrasive glue, The frosted rubber layer coated by the wire roller is not uniform enough, and there are traces of flakes. The frosted glue is not easy to flow and form deposits when stored in the mesh pit. The adjustable range of coating thickness is small and almost unchanged. In addition, the ambient temperature and humidity are not stable. Stability and other factors, after the frosted glue is oxidized, it will settle in the mesh pit for a long time, causing blockage and remaining in the glue hopper. As time goes by, the coating effect will become worse until it cannot be produced.

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