Security Booklet Sheet Groove Pattern for Closure and Anti-Tampering
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Solution Overview
Problem
Customizable pages in security booklets stiffened with plastic-based materials often fail to close correctly due to high rigidity, and existing solutions to address this issue introduce weaknesses that can be exploited by counterfeiters, such as continuous lines of weakness that can serve as tear starters.
Innovation Solution
A customizable sheet is processed with a plastic-based material that includes a set of grooves drawn in a sinuous pattern parallel to the fold line, with each groove comprising a proximal and distal line that intersects the seam line, creating a serpentine or wavy shape to enhance security and prevent tearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the customizable page is stiffened with a plastic-based material, then the rigidity and security features are improved, but the booklet closure is worsened due to excessive rigidity
Solution Approach 1:
The plastic-based material is applied selectively only to the customizable page rather than the entire booklet, creating a localized difference in rigidity. This allows the customizable page to maintain enhanced strength and security features while the rest of the booklet retains flexibility for proper closure.
Solution Approach 2:
The thickness of the plastic-based material varies across different regions of the customizable page. The material is thickest at the center and gradually thin toward the edges, creating a gradient that provides central rigidity for security while maintaining edge flexibility for booklet closure.
2Ease of operation
If the plastic-based material is machined locally to reduce thickness, then the booklet closure is improved, but security weaknesses are introduced that can be exploited by counterfeiters
Solution Approach 1:
The solution combines the customizable page (paper or synthetic) with a plastic-based material in a composite structure. This composite provides both the rigidity needed for security features and the flexibility required for booklet closure, while the varying thickness distribution prevents creation of continuous weakness lines that could be exploited by counterfeiters.
3Strength
If the plastic-based material has significant rigidity, then the readability and anti-creasing properties are improved, but the booklet closure is worsened
Solution Approach 1:
The plastic-based material is positioned specifically on the customizable page where anti-creasing properties are most needed for readability, while the absence or reduced presence of plastic at the booklet edges maintains flexibility for closure. This localized application resolves the contradiction between rigidity and flexibility.
Data Source
Figure 1A~2
Figure 3~6
Figure 5A~5E
AI summary
The invention relates to a method for treating a customisable sheet for a security booklet, comprising: producing a customisable sheet stiffened with a plastic material, comprising a customisable page (50) that is intended to include individual information relating to the booklet holder; defining a fold line (40) therein; locally machining the plastic material along a set of striations (60) depicting, in the plane of the customisable page (50), a unit comprising at least one shape located within a band (62) that extends parallel to the fold line (40) and includes a proximal line (63) and a distal line (64) relative to said fold line. The method of the invention is substantially characterised in that: each striation is between two stop points which are arranged on the proximal line (63) and the distal line (64), respectively; and the striations intersect with the stitching line (40).