Leaf Binding via Segmented Fold Lines

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Solution Overview

Problem

Existing book binding methods face durability issues and tear formation along fold lines due to intensive turning of leaves, which affects the seamless printing across opened pages.

Innovation Solution

A method where each leaf is pre-folded along two parallel lines at different distances from the edge, creating multiple fold lines that allow the leaves to open flat without visible binding and distribute wear evenly, enhancing durability and aesthetic appeal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single fold line is used for binding leaves, then the leaves can be opened flat with seamless printing, but the fold line weakens and tears form after intensive turning

Engineering Contradiction:

Improvedurability of fold lineVSAvoidstrength of fold line

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The single fold line is segmented into multiple parallel fold lines (first fold line and second fold line) spaced apart from each other. This segmentation distributes the mechanical stress of turning across multiple lines, preventing any single line from weakening and tearing under intensive use, thereby resolving the contradiction between durability and strength.

Inventive Principle:

Principle #1Segmentation

2Reliability

If multiple fold lines are created at different distances from the edge, then wear is distributed evenly and durability increases, but the complexity of the folding structure increases

Engineering Contradiction:

Improvedurability of bindingVSAvoidcomplexity of fold lines

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The binding structure is segmented into multiple parallel fold lines instead of a single fold line. This segmentation distributes wear evenly across all fold lines, increasing durability while maintaining a relatively simple and regular structure that does not significantly increase complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The position parameter of the fold lines is changed by creating multiple fold lines at different distances from the edge (first distance and second distance). This parameter change allows wear distribution across multiple lines while maintaining a systematic and manageable structure.

Inventive Principle:

Principle #35Parameter changes

3Shape

If the fold lines are placed close together, then the leaves open flat with seamless printing appearance, but the fold lines may become noticeable

Engineering Contradiction:

Improveflatness of opened leavesVSAvoidvisibility of fold lines

Core Design Contradiction:

ShapeVSEase of manufacture

Solution Approach 1:

The distance parameter between fold lines is optimized to be small but non-zero. This allows the leaves to open flat with seamless printing appearance while keeping the fold lines sufficiently spaced to avoid being noticeably close together, balancing the visual flatness with manufacturing simplicity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10926567B2Method for binding a bundle of leaves

Publication Date: 2021.02.23 PELEMAN IND NV

AI summary

Disclosed is a method for binding a bundle of leaves, of which a strip of each of the leaves is folded separately beforehand along a first line to form a first fold line that extends parallel to and at a first distance from the edge, and subsequently is folded again along a second line to form a second fold line that extends parallel to and at a second distance from the edge whereby the first distance is different from the second distance.