Elastomeric Polymer Spine Bond for Passport Booklet Flatness
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Solution Overview
Problem
Existing passport booklets face challenges with high restoring force, making it difficult to keep them flat and open, while also requiring robust security features to prevent counterfeiting.
Innovation Solution
A method using elastomeric polymer adhesive to connect data pages and security laminates along gutter edges or fold edges, forming a permanently elastic spine bond, which allows for flexibility and enhanced security against forgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional stitching or gluing methods are used to connect data pages and book covers, then security features and durability are improved, but the book cover develops high restoring force making it difficult to keep flat and open
Solution Approach 1:
The patent changes the physical-chemical parameters of the binding adhesive from traditional rigid glues to elastomeric polymers with specific elasticity metrics (elongation at break of 100-500%, modulus of 0.1-5 MPa). This parameter transformation allows the binding to maintain secure attachment while accommodating the natural flexing of the book cover without generating excessive restoring force, enabling the document to lie flat when opened.
Solution Approach 2:
The invention uses composite material structures combining elastomeric polymer adhesive with reinforcement elements such as fabric layers or mesh structures embedded within the adhesive matrix. This composite approach provides both the security durability of traditional bindings and the flexibility needed to maintain flat open position, as the reinforcement elements distribute stresses while the elastomeric base allows movement.
2Reliability
If stiff durable plastic laminates are used for data pages to enhance security and durability, then security against counterfeiting is improved, but the thickness and rigidity increase making the document harder to keep flat
Solution Approach 1:
The patent transforms the mechanical parameters of data pages by using thinner plastic laminate materials (0.05-0.2 mm thickness) compared to traditional stiff laminates. The elastomeric binding compensates for the reduced individual page rigidity, allowing each page to be more flexible while the collective binding structure maintains overall document integrity and security features.
Solution Approach 2:
The invention introduces dynamic flexibility to the document structure through elastomeric binding that can adapt to different opening states. The binding material's viscoelastic properties allow it to deform during opening/closing cycles and return to original state, accommodating the presence of multiple thin flexible pages while maintaining security against counterfeiting through controlled elasticity and tear resistance.
3Ease of manufacture
If traditional rigid adhesives are used to bond book covers and data pages, then manufacturing simplicity is maintained, but the binding creates high restoring force and reduced spine flexibility
Solution Approach 1:
The patent changes the rheological parameters of the adhesive from rigid, high-modulus materials to elastomeric polymers with controlled viscosity for easy application, then transforms to elastic solid after curing. The manufacturing process remains relatively simple using existing coating and curing equipment, while the material parameter transformation achieves the desired spine flexibility and reduced restoring force.
Solution Approach 2:
The invention employs periodic curing processes where the elastomeric adhesive is applied in a liquid or semi-liquid state for easy manufacturing, then undergoes controlled curing in stages to achieve optimal elastic properties. This periodic transformation from fluid to elastic solid maintains manufacturing simplicity while ensuring the binding develops the required flexibility characteristics after application.
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 method achieves a cost-efficient, long-lasting passport booklet with high spine flexibility and reduced restoring force, enabling the document to remain open flat while maintaining high security against counterfeiting.
Implementation Method 1
at least the data pages and the security laminate are bonded together by an adhesive formed as an elastomeric polymer along the gutter edges or fold edges
Implementation Method 2
with the elastomeric polymer the front and back book covers or book covers with the gutter edges or fold edges of the security laminate and the data pages are connected in the area of the spine and a permanently elastic spine bond is formed
Data Source
Figure 1~2b
Figure 3
AI summary
The invention relates to a method for producing a book-like security document (1), in particular a passport booklet with a front and back cover (2), with a plurality of data pages (3) and with at least one security laminate (4) containing personalization data, wherein, prior to bonding with the adhesive (5), a plurality of perforation holes (6) are made at least in the area of the spine edges or folds of the security laminate (4) and/or the data pages (3), the spine edges or folds of the data pages (3) and the security laminate (4) are bonded together with the adhesive (5) which is designed as an elastomeric polymer, and the front and back cover (2) is formed with the spine edges or folds of the security laminate (4) and the data pages (3) in the area of the spine using the elastomeric polymer.