Corrugated Board Corner Shaping via Integrated Punching
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Solution Overview
Problem
Existing corrugated cardboard production processes face challenges in efficiently producing surface-rigid formats with shaped corners, requiring complex setup and specialized tools, and are prone to quality issues due to varying material strength and moisture effects during transport and storage.
Innovation Solution
A method and plant design that integrates corner die-cutting into the continuous production process, using a corner shape punching device to create corner cuts in the heated corrugated cardboard web, synchronized with longitudinal and transverse cutting, allowing for high-speed production of formats with precise corner shapes without the need for separate corner punching tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate corner punching machines and tools are used, then corner shaping can be performed, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the corner shaping function with the existing cross-cutting device by integrating a corner punching tool into the cross-cutting cylinder. This merging eliminates the need for separate corner punching machines and tools, reducing device complexity while maintaining corner shaping capability. The corner punching tool is operated simultaneously with the cross-cutting operation, unified under a single device.
Solution Approach 2:
The cross-cutting cylinder is given multiple functions: it performs both the cross-cutting operation and the corner shaping operation. By mounting the corner punching tool on the cross-cutting cylinder, the same device executes two different functions, eliminating the need for specialized corner punching equipment and reducing overall system complexity.
2Manufacturing precision
If specialized corner punching tools are used, then corner shaping quality improves, but setup time and adaptability decrease
Solution Approach 1:
The corner punching tool is designed with adjustable parameters including punching depth, punching position, and tool orientation. These dynamic adjustments allow the same tool to adapt to different format sizes and corner shapes without requiring specialized tools for each format, maintaining high corner shaping quality while improving versatility.
Solution Approach 2:
The invention utilizes parameter changes in the corner punching tool configuration to adapt to different formatting requirements. By adjusting punching depth, position, and timing parameters, the same physical tool can produce high-quality corners on various format sizes, eliminating the need for tool changes or specialized equipment for each format type.
3Ease of manufacture
If separate corner punching operations are performed, then corner shaping is achieved, but production time increases
Solution Approach 1:
The corner punching operation is merged with the cross-cutting operation into a single simultaneous process. Both operations are performed by the same device (the cross-cutting cylinder with integrated corner punching tool) in one pass, eliminating the need for separate corner punching steps and thereby increasing production speed.
Solution Approach 2:
The corner punching tool operates continuously during the cross-cutting process without interrupting the web flow. The punching action is synchronized with the web movement and cross-cutting operation, maintaining continuous production flow and eliminating idle time that would occur with separate corner punching operations.
4Ease of manufacture
If corner punching is performed on dried web, then corner shaping is achieved, but material strength varies causing quality issues
Solution Approach 1:
The corner punching operation is performed on the web while it is still in the heated/drying section, before the web is fully dried and stacked. This preliminary action on the warmer, more pliable web reduces variability in material strength and prevents the quality issues associated with punching dried, brittle material.
Solution Approach 2:
The invention changes the physical state parameter of the web by performing corner punching while the web is still warm from the drying section. This parameter change (temperature/moisture content) makes the material more uniform and easier to punch consistently, improving reliability of the corner shaping operation.
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 simplifies the production of corrugated board formats with shaped corners, enhancing production speed, reducing manufacturing effort, and ensuring high-quality punching with flexibility to adapt to different dimensions and corner shapes, while eliminating the need for separate corner punching and minimizing material changes during storage.
Implementation Method 1
the corrugated cardboard web dried during its production while maintaining continuous web movement
Data Source
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AI summary
During its production, a rigid corrugated-board web (2) is cut into corrugated-board formats (3) by at least one longitudinal severing cut (41, 42) and transverse severing cuts (51), a continuous movement of the web being maintained in the process. In addition, corner-shaping cuts (61, 62) are punched in coordination with the at least one longitudinal severing cut (41, 42) and the transverse severing cuts (51), these corner-shaping cuts removing corner material in the form of punched parts (63, 64) and producing at least one shaped edge of the corrugated-board formats (3). The corner-shaping cuts (61, 62), which, in relation to the web width, are punched one after the other in at least one width position, the at least one longitudinal severing cut (41, 42) and the transverse severing cuts (51) are made in alignment with one another. A corrugated-board making installation (1) for implementing the method comprises a corner shaping-cut punching arrangement (6), which produces punched sections in the moving corrugated-board web (2) in order to produce the corner-shaping cuts (61, 62), and synchronizing control means (75, 76) for synchronizing the production of the transverse severing cuts (51) with the production of the corner-shaping cuts (61, 62).