Fiber Composite Insert Sheet Penetration Bonding
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Solution Overview
Problem
Existing multi-layer structures for insert sheets in valuable and security documents lack sufficient breaking strength and tear resistance while maintaining good printability, and are vulnerable to manipulation.
Innovation Solution
A multi-layer structure comprising a core layer of fiber composite with a thermoplastic polymer layer applied on one side, where the thermoplastic polymer penetrates into the fiber composite layer to create a strong, inseparable bond, enhancing breaking strength and tear resistance, and incorporating security features for tamper evidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a multi-layer structure with bonded layers is used, then breaking strength and tear resistance are improved, but the layers can still be peeled or split apart allowing tampering
Solution Approach 1:
The thermoplastic polymer layer is merged with the fiber composite layer through penetration bonding, where the thermoplastic material penetrates into the fiber layer and bonds with it. This creates an integrated composite structure where the layers are no longer separable without destruction, thus preventing peeling and splitting while maintaining high breaking strength.
Solution Approach 2:
The invention creates a composite material structure where a thermoplastic polymer layer is combined with a fiber composite layer through penetration bonding. This composite structure integrates the properties of both materials - the strength and flexibility of fibers with the bonding and sealing properties of thermoplastic polymer - resulting in a material that resists both breaking and peeling/splitting failures.
2Stability of the object's composition
If layers are bonded together, then structural integrity is improved, but printability may be compromised
Solution Approach 1:
The thermoplastic polymer layer is applied selectively to specific regions of the fiber composite layer rather than covering the entire surface. This localized application maintains the printability of the fiber layer where needed while providing structural reinforcement and tamper evidence where the polymer is applied. The penetration depth is also controlled to maintain surface quality for printing.
3Strength
If thermoplastic polymer is applied to fiber composite, then breaking strength increases, but the structure becomes more complex
Solution Approach 1:
The invention extracts the bonding function from a separate adhesive layer and integrates it directly into the thermoplastic polymer layer that is already part of the multi-layer structure. The thermoplastic layer serves dual purposes: providing structural reinforcement and creating the bond with the fiber composite through penetration, thereby eliminating the need for additional adhesive layers and simplifying the overall structure.
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
The solution provides increased breaking strength, improved tear resistance, and secure integration of security features, making manipulation attempts visible and preventing peeling or splitting, while allowing for decentralized personalization and printing.
Implementation Method 1
a thermoplastic polymer layer (19) applied on one side (19a) to this fiber composite layer (18), wherein in the overlap region of the at least one layer (19) with the fiber composite layer (18), the at least one layer (19) is at least partially penetrated into the fiber composite layer (18) in relation to its thickness
Data Source
Figure 1a~4
Figure 5~8
AI summary
The invention relates to a multilayer structure for an insert leaf for binding into a, preferably book-like, security and/or valuable document, having a region for the formation of a data sheet (14) and a region for the formation of a tab (16), wherein provision is made of at least one fibre composite layer (18) and at least one layer (19, 24) of a thermoplastic polymer, which is applied to at least one side of the fibre composite layer (18) and at least partially penetrates into the fibre composite layer (18) in the region of overlap with respect to the thickness of the layer (19, 24).