Corrugated Board Creasing Tool with Elastic Shapers
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Solution Overview
Problem
Existing devices for creasing corrugated board often cause tearing of the outer layer, especially when bending, due to stress concentration at the crease area, which is visually noticeable and indicates damage, particularly in printed layers.
Innovation Solution
The device features a shaped body made of hard plastic with shapers that reduce their horizontal distance during creasing, inclined surface sections for fixing the cardboard, and a bulge that allows elastic deformation, reducing stress and preventing outer layer tearing by forming a predetermined buckling point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a scoring line is used to form a groove in corrugated cardboard, then the cardboard can be creased, but the outer layer tears when bending due to stress concentration
Solution Approach 1:
The shaped body is divided into multiple shapers (at least two) arranged parallel to each other, creating multiple grooves instead of a single groove. This segmentation distributes the stress concentration points, preventing the outer layer from tearing at a single location while still achieving effective creasing.
Solution Approach 2:
The shaped body made of hard plastic (polyamide) acts as an intermediary between the tool and the corrugated cardboard. It provides a controlled deformation mechanism that reduces stress concentration on the outer layer while still forming the necessary grooves for creasing.
2Strength
If an additional scoring groove tool is used to prevent outer layer tearing, then the outer layer is protected, but the alignment precision and assembly effort increase
Solution Approach 1:
The shaped body combines multiple functions into a single component: it creates grooves for creasing, distributes stress to prevent tearing, and integrates multiple shapers in one piece. This eliminates the need for separate scoring groove tools and reduces assembly complexity while maintaining outer layer integrity.
Solution Approach 2:
The shaped body serves multiple purposes simultaneously: forming creases through groove creation, preventing outer layer tearing through stress distribution, and providing a universal solution that works for different creasing requirements by adjusting the number and arrangement of shapers.
3Strength
If the horizontal distance between shapers is reduced, then the stress distribution improves and tearing is prevented, but the device complexity increases
Solution Approach 1:
The invention optimizes the horizontal distance between shapers as a critical parameter. By reducing this distance, the stress distribution across the outer layer is improved, preventing tearing. The specific parameter optimization balances stress distribution benefits with manufacturing feasibility.
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 design significantly reduces the risk of outer layer tearing during folding, maintaining the integrity of printed layers and ensuring the corrugated board can be folded without damage, even with printed outer layers.
Implementation Method 1
the shapers are designed so that when the grooves are formed, their spacing in the horizontal direction decreases
Implementation Method 2
on the ones facing away from each other Sides of the shapers of the shaped bodies are arranged surface sections for fixing the corrugated cardboard or the cardboard
Implementation Method 3
the shaped body has a middle part that merges into edge areas on its opposite sides, so that the middle part has a rounded elevation that in the area of the middle part between the shapers of the shaped bodies has an approximately constant thickness, and that a free space is formed between the elevation and the upper part of the tool, into which the central part can deform elastically when forming the grooves
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
The invention relates to an apparatus (10; 10a to 10m) for scoring corrugated board (1) or cardboard, having a strip-like scoring tool which can be fastened on an upper tool part (101) and, for forming a scoring formation (24, 25), can be displaced against the cardboard or the corrugated board (1) arranged in the region of a lower tool part (102).