Textile Tab Sealing for Data Page Edge Stability
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Solution Overview
Problem
Existing methods for producing data pages in security documents, such as passports, using textile band materials result in open cut edges that can weaken the tab interface, leading to curling and unraveling issues.
Innovation Solution
A method where a textile strip tab is cut to a length shorter than the final format distance, with sealed end faces positioned inwardly relative to the data carrier's cutting lines, and sealed using thermal or chemical treatments or a sealing compound to prevent curling and fraying, ensuring a closed interface during trimming and final formatting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flap is cut to the final format distance, then the data carrier can be trimmed to its final format, but the cut edges of the textile flap become open and cause curling and fraying
Solution Approach 1:
The flap is cut to a length shorter than the final format distance before the data carrier is trimmed. This preliminary cutting action allows the data carrier to be trimmed to its final format while the flap remains protected from the cutting process. The flap is then positioned to overlap the data carrier edge, and its end face is sealed to prevent curling and fraying, thus resolving the contradiction between achieving final format precision and maintaining flap edge stability.
2Reliability
If the flap is made shorter than the final format distance, then the sealed end face is preserved during trimming, but additional processing steps are required
Solution Approach 1:
The flap cutting, sealing, and positioning operations are integrated into a coordinated sequence that occurs before the data carrier trimming. The flap is cut to a shorter length, sealed at its end face, and positioned to overlap the data carrier. This merging of operations allows the subsequent data carrier trimming to proceed without affecting the flap, preserving the sealed end face while maintaining reasonable process complexity through efficient operation sequencing.
3Ease of manufacture
If the flap overlaps the data carrier edge, then the tab interface is formed, but the open cut edges weaken the flap at the cut point
Solution Approach 1:
The flap is cut to a shorter length before being positioned to form the tab interface. This preliminary cutting at a reduced length ensures that the cut edges do not extend to the final data carrier edge, preventing the weakening effect. The flap is then sealed at its end face to further prevent curling and fraying, while still allowing the tab interface to be formed through overlapping and connection to the data carrier.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures a secure, sealed, and stable tab interface that prevents fraying and curling, maintaining the integrity of the data page and book-like document, even after trimming, thereby enhancing the security and durability of the document.
Implementation Method 1
a textile tape material impregnated or coated with a sealing compound can be provided for the flap
Implementation Method 2
at least the end face of the flap is sealed by a thermal or chemical treatment
Data Source
Figure 1~4
Figure 3~7
AI summary
The invention relates to a method for producing a data page, a book block, and a book-like document, to a data page, to a book block, and to a book-like document which comprises a data carrier (20) with a tab (23) that is secured thereto and is made of a textile strip material. The tab (23) is trimmed to a size which is smaller than the spacing of the cutting lines (57) in order to form lateral edges (35, 36) of the data carrier (20) in the final format, thereby forming end faces (37, 38), prior to combining the tab (23) and the data carrier (20). At least the end faces (37, 38) of the tab (23) are sealed or a tab (23) with a sealed strip material is provided, and the tab (23) is positioned so as to form an overlapping region (31) with the data carrier (20) and is connected to said data carrier, wherein each end face (37, 38) is aligned so as to be set back inwards relative to the cutting line (57).