Book Block Binding via Thread Intertwining and Endpaper Fixing
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Solution Overview
Problem
The existing methods for producing book blocks for valuable or security documents are complex and time-consuming, requiring multiple process steps and frequent changes of threads, which can lead to inefficiencies and potential manipulation vulnerabilities.
Innovation Solution
A method involving intertwining and passing at least two threads through binding holes along a fold edge of the book block, with loop ends or thread ends being pre-fixed on the inner side of the endpaper without knotting, allowing for a simpler connection technique that reduces process steps and enhances security features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional chain stitch method is used with upper and lower thread spools, then secure binding is achieved, but device complexity and production time increase due to frequent bobbin changes
Solution Approach 1:
The invention extracts and eliminates the lower thread spool (bobbin) from the traditional chain stitch system, leaving only the upper thread spool. This simplification removes the complexity of bobbin changes while maintaining binding security through the modified stitching pattern where thread ends are fixed to the endpaper.
Solution Approach 2:
Instead of using two threads that interlock in a traditional chain stitch, the invention uses a single thread that is passed through multiple loops and secured by fixing its ends to the endpaper. This inverts the traditional approach of mutual thread interlocking to a single-thread self-securing system.
2Strength
If multiple process steps are used for book block production, then binding strength is improved, but production time increases
Solution Approach 1:
The thread ends are fixed to the endpaper in advance during the stitching process itself, eliminating the need for separate knotting or securing steps. This preliminary action integrates the securing function into the main stitching operation, reducing total process time while maintaining binding strength.
3Strength
If threads are knotted to secure the binding, then connection strength is improved, but book block height increases
Solution Approach 1:
The invention removes the knotting step from the binding process by instead fixing the thread ends directly to the endpaper. This extraction of the knotting function eliminates the additional height that knots would add to the book block while maintaining connection strength through the fixed thread ends.
4Quantity of substance
If frequent bobbin changes are required, then thread supply is maintained, but production efficiency decreases
Solution Approach 1:
By removing the lower bobbin from the system entirely, the invention eliminates the need for bobbin changes. The single upper thread spool supplies all required thread throughout the entire production process, maintaining adequate thread supply without the productivity losses from frequent changes.
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 method simplifies the production of book blocks, reduces process time, and enhances security by eliminating the need for a lower thread spool, allowing for flexible configuration and additional reinforcement at connection points, while also providing a secure arrangement that is easy to verify for authenticity.
Implementation Method 1
the coating of the thread(s) can be melted by exposure to heat, thereby bonding the seam
Implementation Method 2
a stitch seam is created which is impregnated with an anaerobic adhesive that cures by UV drying
Data Source
AI summary
The invention relates to a method for producing a book block (15) for a book-type value document or security document (11), in which: one or more inner pages (18) and an endpaper (14) are assembled to form a stack; multiple binding holes (36) are introduced into the at least one inner page (18) and the endpaper (14) arranged along a folded edge (16) or the binding holes (36) of the at least one inner page (18) and the endpaper (14) are aligned relative to one another; multiple threads (32, 33) are supplied and guided through the binding holes (36); and the at least one inner page (18) and the endpaper (14) are connected to one another to form a book block (15); wherein a thread connection (28) is produced in which the at least two threads (32, 33) are intertwined with one another and guided through at least two binding holes (36) and brought out on a common inner side (37) of the endpaper (14), and in which the threads (32, 33) are prefixed to the endpaper (14).