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A composite transparent holographic film production process

A production process and composite technology, applied in the direction of layered products, copying/marking methods, printing, etc., can solve the problems of restricting the research and application of transparent holographic films, diffraction pattern interference, and difficult to control uniformity, so as to avoid structural and Functional compatibility and matching issues, reducing equipment and labor costs, and the effect of reducing equipment and footprint

Active Publication Date: 2015-12-09
ZHEJIANG JINGHUA LASER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For transparent holographic films, transparent materials such as zinc sulfide and titanium dioxide must be selected as the dielectric layer to obtain transparent holographic patterns. However, the transparent inorganic dielectric layer is greatly affected by the high-temperature evaporation process, and the uniformity is difficult to control. The transparency of the coating is poor, and the existence of the transparent medium coating, there are two interfaces: the information layer / medium layer (the first interface) and the medium layer / printing layer (the second interface), which may result in the first The diffraction pattern of the interface is interfered by the diffraction pattern of the second interface, so that the technical indicators such as diffraction efficiency and signal-to-noise ratio of the transparent optical holographic film are lower than those of the aluminum-coated holographic film
[0005] In addition, molded laser holography technology is a grating preparation technology for optical holographic films, but this technology requires high temperature (about 150°C) and high pressure production conditions, which will lead to thermal shrinkage deformation of the film, loss of transparency and information distortion
The above factors will eventually lead to transparent holographic films lower than non-transparent holographic films such as aluminized holographic films and holographic hot stamping foils in terms of diffraction efficiency, signal-to-noise ratio and other technical indicators.
[0006] To sum up, the current coating design of transparent holographic film is still unable to break through the technical difficulties caused by the decline of diffraction performance of transparent holographic film, the original multi-interface coating structure, high temperature evaporation and molding, which greatly limits the application of transparent holographic film. Research and Application

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  • A composite transparent holographic film production process
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Examples

Experimental program
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Effect test

Embodiment 1

[0044] A composite transparent holographic film production process, such as figure 1 shown, including the following steps:

[0045] Step 101, preparation of composite coating solution:

[0046] 1) Preparation of nanomaterial dispersion: use tetrahydrofuran as a solvent, ammonium polyacrylate as a dispersant, weigh titanium dioxide with an average particle size of 40nm and add it to tetrahydrofuran, use 6KW power ultrasonic wave, and oscillate at a frequency of 80KHz for 4min to make a uniform Dispersion system; ultrasonic power, frequency and oscillation time can be adjusted according to actual needs, generally use 6-8KW power, 80-100KHz ultrasonic oscillation for 4-8min;

[0047] Dispersion liquid component and content (weight part) proportioning are as follows:

[0048] Tetrahydrofuran 56.7

[0049] Ammonium polyacrylate 32.4

[0050] Nano Titanium Dioxide 10

[0051] The above ratio relationship can make nano-titanium dioxide uniformly dispersed without sedimentation f...

Embodiment 2~5

[0068] The basic production process of the composite transparent holographic film described in Examples 2 to 5 is the same as that of Example 1, the difference mainly lies in the different components and volume fractions of the composite coating solution, as shown in Table 1.

[0069] Table 1: Components and proportioning relationship of the composite coating solution of Examples 1 to 5:

[0070] serial number Nanomaterials (average particle size) Dispersion ratio Polyurethane solution ratio Volume fraction of nanomaterials Composite coating liquid refractive index Composite coating solution light transmittance Example 1 Titanium dioxide (40nm) 8 40 2% 1.56 92% Example 2 Titanium dioxide (50nm) 20 40 5% 1.57 90% Example 3 Zinc oxide (60nm) 40 40 10% 1.63 88% Example 4 Zinc sulfide (50nm) 60 40 15% 1.7 85% Example 5 Cadmium sulfide (60nm) 40 40 10% 1.63 88%

[0071] From the experimental data o...

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Abstract

The invention discloses a production process of a compound transparent holographic film, and belongs to the technical field of laser anti-counterfeit. The production process comprises the preparation of compound film coating liquid, the coating of the compound film coating liquid, the low-temperature film formation and UV pre-curing of the film coating liquid, the wired mold pressing and UV light full curing, and the rolling of the transparent holographic film; and the production process combines an information layer with a medium layer as a whole through the compound film coating liquid to form a compound coating layer, so that the prepared transparent holographic film has such characteristics as high refraction index, high transparency and signal-to-noise ratio, excellent wear and ageing resistance and obvious holographic image contrast, the technical bottlenecks of difficult tracking and difficult positioning due to small contrast in a traditional transparent holographic image are broken through, the random positioning of a transparent holographic pattern in a certificate is really achieved, and the comprehensive anti-fake effect of transparent hologram is enhanced.

Description

technical field [0001] The invention relates to a production process of a composite transparent holographic film, which belongs to the technical field of laser anti-counterfeiting. Background technique [0002] At present, conventional optical holographic films are generally composed of functional coatings such as a plastic base layer, a separation layer, an information layer, a dielectric layer, and a printed rubber layer. In the preparation process, the separation layer is first coated on the plastic base layer, and then the information layer is coated on the separation layer, and then the plastic film coated with the separation layer and the information layer is molded on a molding machine, and the holographic pattern is embossed on the On the information layer, and on the information layer printed with holographic patterns, a dielectric layer is coated, or an offset printing layer is applied, so as to prepare an optical holographic film capable of displaying holographic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41M5/00B41M1/12B32B37/15B32B37/06B32B38/16B32B38/18G03H1/18
Inventor 邵波熊建华徐意
Owner ZHEJIANG JINGHUA LASER TECH CO LTD
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