Corrugated Fiberboard Folding Device with Center-Moving Forming Belts
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Solution Overview
Problem
The existing sheet folding devices for corrugated fiberboards face challenges in accurately bending the fiberboards due to differences in rigidity, leading to potential offset and damage during the folding process, particularly when the corrugated fiberboard with low rigidity is processed using methods designed for high rigidity boards.
Innovation Solution
The introduction of forming belts and rollers that move towards the center of the fiberboard to press and bend the ends from the outside, with forming rollers positioned upstream from the 90° bending point to support the inner sides and prevent the rollers from being embraced by the bent fiberboard, ensuring accurate bending and reducing the risk of offset or damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the corrugated fiberboard is firmly crushed by creasing line rolls to form folding lines, then the folding lines are properly formed for high rigidity boards, but the bending position may offset or the fiberboard may be damaged when the board has low rigidity
Solution Approach 1:
The patent changes the crushing force parameter by providing adjustable crushing rollers that can apply different levels of pressure. The crushing force is made variable to adapt to different fiberboard rigidities, allowing proper folding line formation for high rigidity boards while using gentler pressure for low rigidity boards to prevent offset and damage
Solution Approach 2:
The patent introduces dynamically adjustable crushing rollers that can modify their crushing force during operation. The crushing force is not fixed but can be changed based on the specific fiberboard being processed, enabling the system to adapt to varying rigidity conditions and maintain reliable folding across different material types
2Manufacturing precision
If a crushing roller is provided on the downstream side to crush side portions after 90° bending, then the side portions are properly crushed for high rigidity boards, but the corrugated fiberboard embraces the crushing roller making it difficult to accurately perform bending
Solution Approach 1:
The patent applies preliminary crushing action to the side portions of the fiberboard before the main bending operation. By pre-crushing the side portions, the material becomes more compliant and easier to bend accurately, preventing the embracing problem that occurs when crushing is attempted after bending
Solution Approach 2:
The patent inverts the conventional sequence by crushing the side portions before bending rather than after. This reversal of the operation sequence eliminates the problem of the fiberboard embracing the roller, as the material is prepared for bending before the bending force is applied
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 solution improves the bending accuracy of corrugated fiberboards by preventing the rollers from being engulfed by the bent fiberboard, allowing for precise folding and reducing the risk of damage, thereby enhancing the overall folding process.
Implementation Method 1
forming belts which are disposed on both sides in a transfer direction of a corrugated fiberboard and move toward a center side in a width direction of the corrugated fiberboard toward a downstream side in the transfer direction of the corrugated fiberboard so as to press and bend both end portions of the corrugated fiberboard in the width direction from outside
Implementation Method 2
forming rollers which come into contact with inner sides of both bending portions of the corrugated fiberboard in the width direction on the center side in the width direction of the corrugated fiberboard from the forming belts
Data Source
AI summary
A sheet folding device and method, and a box-making machine, wherein are provided a molding belt for moving on a center side in the width direction of a cardboard sheet toward a downstream side in a transfer direction of the cardboard sheet and thereby pressing and folding both end parts in the width direction of the cardboard sheet from the outside, and a folding roller group formed by folding rollers for contacting insides of fold parts on both sides in the width direction of the cardboard sheet more toward the center in the width direction of the cardboard sheet than the molding belt, the folding rollers being arranged further upstream in the transfer direction of the cardboard sheet than a 90-degree folding position of the cardboard sheet.