Corrugated Board Scorer Head Gap Control for Uniform Score Depth
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Solution Overview
Problem
The existing scorer devices in corrugating machines face issues where the depth of scores formed on a corrugated cardboard web varies due to close proximity of adjacent scores, leading to inconsistencies in score depth and quality of the corrugated board.
Innovation Solution
A control device and method that adjusts the gap between upper and lower rolls of scorer heads to correct the score depth based on manufacturing conditions, including the interval between adjacent scores, ensuring uniform depth across all scores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the interval between adjacent scores is reduced to achieve narrow spacing (about 10 mm to several tens of mm), then the productivity and design flexibility of the corrugated board are improved, but the manufacturing precision of score depth deteriorates due to interference between adjacent scorer heads
Solution Approach 1:
The patent applies local quality by making each scorer head independently adjustable in the width direction. This allows each scorer head to be positioned optimally to avoid interference with adjacent scorer heads, thereby maintaining score depth precision even when scores are closely spaced. The independent adjustability ensures that local conditions at each scoring position can be optimized without affecting other positions.
Solution Approach 2:
The patent implements preliminary action by pre-adjusting the positions of scorer heads in the width direction before the scoring operation. This preliminary positioning prevents interference between adjacent scorer heads during operation, ensuring that scores can be formed at narrow intervals without compromising depth consistency. The movement units are used beforehand to set optimal positions.
2Device complexity
If multiple scorer heads are arranged on the same side to simplify device structure, then the device complexity is reduced, but the interval between adjacent scores cannot be narrowed due to physical constraints
Solution Approach 1:
The patent resolves this contradiction by utilizing the width direction (another dimension) as an additional degree of freedom for positioning scorer heads. Instead of only arranging scorer heads sequentially in the transfer direction, the invention allows scorer heads to be positioned laterally in the width direction. This dimensional approach enables scores to be formed at narrow intervals without requiring complex arrangements in the transfer direction only.
3Ease of operation
If the upper roll is pushed with common pressing force to all scorer heads, then the ease of operation is improved, but the manufacturing precision of score depth deteriorates when scores are closely spaced
Solution Approach 1:
The patent applies local quality by enabling independent width-direction adjustment of each scorer head's position. This local adjustability compensates for the lack of independent pressing force control, allowing each scorer head to be positioned where it can effectively apply pressure without interference from adjacent scorer heads, thereby maintaining score depth precision despite using common pressing force control.
Data Source
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AI summary
The present invention pertains to a control device (20) for controlling a scorer device (10). The scorer device (10) has, as a scorer head (11) that sandwiches a cardboard web (W) between an upper roll and a lower roll to form a ruled line, a first scorer head (11A) that forms a first ruled line (17A) and a second scorer head (11A) that is provided on the downstream side in a conveyance direction with respect to the first scorer head (11A) and forms a second ruled line (17B). The first scorer head (11A) and the second scorer head (11B) can be moved along the width direction. The control device (20) is provided with: an acquisition unit (20A) for acquiring an interval instruction value for setting the interval between the first ruled line (11A) and the second ruled line (11B); and a determination unit (20B) for determining a correction value for correcting the gap between the first scorer head (11A) and the second scorer head (11B) in accordance with manufacturing condition information including the acquired interval instruction value.