Asymmetrical Reverse Folding Score for Corrugated Paperboard
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Solution Overview
Problem
Current folding scores do not effectively facilitate reverse folding of sheet materials like corrugated paperboard without causing bursting or creating excessive ridges and crushing.
Innovation Solution
A reverse folding score is created using a pair of longitudinally extending, laterally spaced asymmetrical score lines on one side and a depression on the opposite side, formed by asymmetrical scoring members, which minimizes crushing and ridge formation during reverse folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional double scores are used to facilitate reverse folding, then the sheet material can be folded, but excessive crushing and ridge formation occur between the score lines
Solution Approach 1:
The scoring members are divided into multiple discrete scoring elements spaced apart from each other. Each scoring element creates an individual score line, and the spacing between elements creates corresponding depressions on the opposite side of the sheet material. This segmentation prevents excessive crushing and ridge formation by distributing the scoring action across multiple discrete points rather than continuous pressure.
Solution Approach 2:
The scoring members are designed with varying local characteristics - each scoring element has specific geometry and spacing that creates localized depressions on the opposite side of the sheet material. This local quality variation ensures that crushing and ridge formation are minimized at each specific location while maintaining effective reverse folding capability.
2Ease of operation
If conventional scoring members are used, then scores can be formed in the sheet material, but the folding accuracy and consistency are insufficient
Solution Approach 1:
The scoring members are pre-configured with specific geometries and spacings that create predetermined score lines and depressions. This preliminary action ensures that when the sheet material is folded, the folds occur at the correct locations with consistent accuracy and repeatability, as the scoring pattern is established before the folding operation.
Solution Approach 2:
The invention replaces traditional mechanical scoring methods with a system that creates scores through the interaction of scoring members with the sheet material, forming depressions on the opposite side. This substitution provides more consistent and accurate folding results by creating a more controlled scoring mechanism.
3Ease of operation
If score lines are formed by compressing the sheet material, then folding is enabled, but bursting occurs from the stress of folding
Solution Approach 1:
The scoring action is segmented into multiple discrete scoring elements rather than continuous compression. This segmentation distributes the stress across multiple points, preventing stress concentration that would cause bursting while still enabling effective folding through the created score lines and depressions.
Solution Approach 2:
The scoring members create depressions on the opposite side of the sheet material before folding occurs. These depressions act as cushioning zones that absorb and distribute the stress of folding, preventing bursting at the score lines while maintaining the folding capability.
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 enables accurate and consistent reverse folding with minimal crushing and ridge creation, surpassing the performance of conventional double scores.
Implementation Method 1
the sheet material is compressed or creased along a single line
Implementation Method 2
the sheet material is compressed or creased along a double line or pair of parallel lines
Implementation Method 3
spaced portions on the outside or non-scoring surface of the sheet material are compressed against the blanket and are forced into the area between the score members, causing a depression on the second side of the sheet material
Implementation Method 4
causing a depression on the second side of the sheet material
Data Source
AI summary
A folding score having a pair of laterally spaced, parallel scoring grooves which are individually asymmetrical. This invention also relates to a method and apparatus for forming the folding score.