Triple Folded Paper Strip Hinge for Flat Binding
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Solution Overview
Problem
Existing methods for binding sheets of paper, particularly for thinner papers with weights less than 120 grams per square meter, result in poor flatness and seamless printing across open sheets, as the folding process is less smooth and often leads to visible gaps and imperfect flatness.
Innovation Solution
The method involves double folding a strip of each sheet along a specific line parallel to the edge, and for papers with less than 120 grams per square meter, the strip is folded at least once more along this line to create a flexible hinge, ensuring the sheets can be opened flat without gaps and allowing seamless printing across the fold lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a strip of each sheet is double folded along the same line to form a fold line, then the sheets can be opened flat and printing runs seamlessly across two open sheets, but for paper with a weight of less than 120 grams per square meter, the opening of sheets along the fold line proceeds less smoothly and pages do not lie perfectly flat
Solution Approach 1:
The strip is divided into multiple folded sections by performing triple folding instead of double folding, creating additional hinge points that segment the folding action into smaller, more manageable steps. This segmentation allows thinner papers to open more smoothly while maintaining flatness.
Solution Approach 2:
The folding process is changed from double folding to triple folding, altering the physical parameter of fold complexity. This parameter change creates a more flexible hinge structure that accommodates thinner papers (less than 120 grams per square meter) while maintaining the desired flat opening and seamless printing.
2Manufacturing precision
If the bundle of sheets is bound in the spine with sharp fold lines against one another, then the sheets can be opened flat with no gap between them, but the adhesive or stitching or staples used to bind the bundle are not visible, yet this method does not work well for paper with a weight of less than 120 grams per square meter
Solution Approach 1:
By triple folding the strip instead of double folding, the hinge is segmented into additional sections. This creates a more flexible structure that maintains consistent alignment and flat opening even for thinner papers bound in the spine.
Solution Approach 2:
The folding parameter is changed from double to triple folding, which fundamentally alters the mechanical behavior of thin sheets during opening. This parameter change ensures reliable and consistent opening performance across different paper weights while maintaining sharp fold line alignment.
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 enhances the binding of thinner sheets to achieve results comparable to thicker sheets, ensuring the pages lie flat and printing continues seamlessly without visible gaps, even for papers with weights less than 120 grams per square meter.
Implementation Method 1
the strip is folded at least once more along the fold line... the sheets can be opened flat without gaps
Data Source
AI summary
Method for binding a bundle (5) of sheets (1), whereby an edge (2) of the bundle (5) of sheets (1) is bound, whereby use is made of sheets (1) in which a strip (4) of each of the sheets (1) is double folded separately beforehand along the same line to form a fold line (3) parallel to and at a distance (A) from the aforementioned edge (2). If paper with a density of less than 120 grams per square meter is used for the sheet (1), after having been double folded the strip (4) is folded at least once more along the aforementioned fold line (3).