Perfect-Bound Booklet Adhesive Gradient for Uniform Sheet Peeling
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Solution Overview
Problem
Existing perfect-bound booklets face issues with non-uniform adhesion between sheets, leading to peeling defects or damage when sheets are peeled away, due to inconsistent application of heat and pressure during bonding.
Innovation Solution
The booklet design incorporates multiple adhesive layers with a thermoplastic adhesive agent, where the amount of adhesive changes from the surface sides to the middle of the booklet, ensuring stronger adhesion in the middle without excessive force, thereby maintaining uniform bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of thermoplastic adhesive agent remains constant from the surface sides toward the middle of the booklet, then the manufacturing process is simple, but the adhesion between sheets becomes non-uniform causing peeling defects
Solution Approach 1:
The patent applies different amounts of thermoplastic adhesive agent at different locations within the booklet. Specifically, the adhesive amount increases from the surface sides toward the middle of the booklet in the thickness direction, creating local variation in adhesive properties. This ensures that the middle portion, which experiences different bonding conditions, receives sufficient adhesive for strong bonding, while the surface portions maintain appropriate adhesive levels to prevent peeling defects.
2Strength
If excessive adhesive is applied throughout the booklet, then strong adhesion is achieved, but peeling defects and damage occur when sheets are removed
Solution Approach 1:
The patent implements location-dependent adhesive application where the amount of thermoplastic adhesive agent varies through the thickness of the booklet. The adhesive amount is increased in the middle portion to ensure strong bonding strength, while the surface portions have reduced adhesive amounts that provide sufficient bonding without causing excessive adhesion that would lead to peeling damage during sheet removal.
3Stability of the object's composition
If the adhesive amount is increased in the middle of the booklet, then uniform bonding strength is achieved, but the manufacturing precision required increases
Solution Approach 1:
The patent changes the parameter of adhesive agent amount as a function of position within the booklet. Specifically, the amount of thermoplastic adhesive agent is varied in the thickness direction, increasing from the surface sides toward the middle. This parameter change approach allows achievement of uniform bonding strength through controlled variation rather than requiring extremely precise uniform application, making the manufacturing process more feasible.
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 configuration enhances sheet adhesion while reducing the likelihood of peeling defects, ensuring strong bonding without tearing or damage during sheet removal.
Implementation Method 1
multiple adhesive layers provided at an end of each sheet in the sheet set and interposed between the sheets and peelably bonding the sheets together
Implementation Method 2
the multiple adhesive layers containing a thermoplastic adhesive agent... which may exhibit strong adhesion between sheets and may be unlikely to experience a peeling defect (tearing or damage) when a sheet is peeled away
Data Source
AI summary
A perfect-bound booklet includes a sheet set that is a stack of multiple sheets and multiple adhesive layers provided at an end of each sheet in the sheet set and interposed between the sheets and peelably bonding the sheets together, the multiple adhesive layers containing a thermoplastic adhesive agent, and the amount of the thermoplastic adhesive agent in the multiple adhesive layers changes from each of a first surface side and a second surface side of the booklet toward the middle of the booklet in the thickness direction.