Safety line and anti-counterfeiting paper thereof
A technology of security thread and anti-counterfeiting paper, which is applied in the field of anti-counterfeiting paper, can solve the problems of high anti-counterfeiting effect on the front line and inconspicuous change effect, and achieve the effect of facilitating large-scale production
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[0058] The preparation method of the anti-counterfeiting security thread spliced by at least two films of different colors in the present invention comprises the following steps:
[0059] 1] Take at least two colored films of different colors; take a base material film;
[0060] 2) Splicing the above-mentioned colored film on the base material film to form a polymer multilayer film through compounding methods, including dry compounding, wet compounding, extrusion compounding, co-extrusion compounding or hot-melt compounding;
[0061] 3) Cut the polymer multilayer film into anti-counterfeit security lines along the direction perpendicular to the splicing direction.
[0062] The method may also include the step of processing edges and / or patterns with a die cutting device or a laser device before or after cutting the polymeric multilayer film.
[0063] Specifically,
[0064] The hot-melt and / or water-soluble base layer can be a dense film, which can be pressed, dried and com...
Embodiment 1
[0076] Embodiment 1 provides a specific implementation of the safety thread of the present invention. see image 3 , in this embodiment, the security thread is a two-layer structure, using hot-melt material nylon polymer film to prepare the base layer; Optically variable features; security thread die cut using die cutting equipment Figure 5 The geometry shown is a band with hollowed out edges; 40 μm thick, 3 mm wide (at its widest point), and 1 mm wide in the hollowed out area. The rainbow light-changing anti-counterfeiting feature has the color-changing characteristic of red to green under the condition of reflected light. The security thread is embedded in the anti-counterfeiting paper in the form of a window during the paper copying process; the window-opening part of the anti-counterfeiting paper is observed under visual reflected light to show rainbow light change characteristics, and the security thread is not easily observed in the non-window area of the window-ope...
Embodiment 2
[0078] Embodiment 2 provides a specific implementation of the safety thread of the present invention. see Figure 4 , the safety line is a three-layer structure, using water-soluble material PVA (polyvinyl alcohol) film as the base layer, and choosing translucent PET pearlescent film as the color film layer, the multi-layer film has the characteristics of pearlescent light change after compounding; wire die cutting Image 6 The shown geometric edge and central hollow band; the safety line is 30μm thick, 4mm wide (at its widest point), and the hollow area is 1mm wide. The security thread is embedded in the anti-counterfeiting paper in the form of a window during the paper copying process; the windowed part of the paper shows the characteristics of pearlescent optical change under visual reflected light, and the security thread is not easy to be observed in the non-windowed area of the windowed surface of the paper page; Observed under transmitted light, a continuous translu...
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