Multilayer Sheet Material with Colored Watermark for Forgery Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current watermarked sheet materials are vulnerable to forgery attempts and lack aesthetic appeal, particularly in secure and value documents, as they can be easily reproduced and lack visual distinction.
Innovation Solution
A sheet material with at least two layers, one defining an outer surface with a specific color and the other incorporating a watermark with different color saturation and hue, making it difficult to reproduce and enhancing aesthetic appeal through multicolor visual effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional watermarking techniques are used in sheet materials, then the document provides basic security against forgery, but the sheet material lacks aesthetic appeal and visual distinction
Solution Approach 1:
The patent applies color changes by incorporating dyeing agents into the sheet material layers that exhibit different colors under different lighting conditions. The first layer has a first color and the second layer has a second color with different saturation and/or hue angle, creating visible multicolor watermarks that enhance both security and aesthetics. This principle transforms a monochromatic watermark into a multicolor security feature that is visually appealing and difficult to reproduce.
Solution Approach 2:
The patent uses composite materials by combining multiple layers with different properties. The sheet material comprises at least two layers: a first layer with a first color and a second layer (preferably fibrous and cellulose-fiber-based) with a watermark and a second color. This composite structure integrates security functionality with aesthetic appearance, creating a material that is both secure and visually distinctive.
2Ease of manufacture
If conventional single-layer watermarking is used, then the manufacturing process is simple, but the watermark can be easily reproduced by optical means
Solution Approach 1:
The patent applies segmentation by dividing the sheet material into at least two distinct layers, each with specific color properties. The first layer defines an outer surface with a first color, while the second layer contains the watermark with a second color having different saturation and/or hue angle. This segmentation creates a multilayer structure that is more difficult to reproduce by simple optical copying methods, as the copy medium cannot capture the layered color structure.
Solution Approach 2:
The patent introduces another dimension by adding color saturation and hue angle as differentiating dimensions beyond the traditional binary watermark presence/absence. The watermark is not just present or absent but has specific color properties (different saturation C* and/or hue angles h) that vary between layers, creating a multidimensional security feature that is harder to replicate.
3Reliability
If multiple layers with different colors are incorporated, then security against forgery is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies local quality by giving different regions of the sheet material different color properties. The first layer has a first color while the second layer has a second color with different saturation and/or hue angle. This localized color differentiation enhances security while maintaining a relatively simple overall structure, as each layer maintains its own uniform color characteristics rather than requiring complex gradients or patterns within each layer.
Data Source
AI summary
The present invention relates to a sheet material (2) comprising at least one first layer defining an outer surface of the sheet material and having at least one first color, at least one second layer comprising at least one watermark (6) and having at least one second color, the first and second colors having at least different saturations and/or hue angles.