Compaction Device for Pressed Material Mat Edge Stability
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Solution Overview
Problem
The production of pressed material mats during the manufacturing of wood-based panels like OSB and MDF faces challenges with edge stability and dissolution issues, particularly during transport and pressing, leading to material loss and contamination.
Innovation Solution
A compaction device is used to compact the narrow sides of the pressed material mat transversely to the production direction, accompanied by a trimming device to adjust the width, ensuring stable edge density and minimizing dissolution phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pressed material mat is trimmed to reduce width variations, then the width consistency is improved, but the narrow sides become more susceptible to vibration and dissolution
Solution Approach 1:
The patent applies preliminary action by compacting the narrow sides of the pressed material mat before it enters the press. The compaction device presses the narrow sides in the direction of the longitudinal center axis, increasing edge density and stability before the trimming operation. This pre-compaction prevents the narrow sides from becoming susceptible to vibration and dissolution during subsequent handling and pressing operations.
2Reliability
If edge elevation is set in the spreading device to ensure edge stability, then the edge stability is improved, but the edge elevation is separated again by the trimming device, requiring material to be returned
Solution Approach 1:
The compaction device performs preliminary compaction of the narrow sides before trimming, creating excess edge density that persists through the trimming operation. This pre-compaction ensures that even after the trimming device removes part of the edge elevation, sufficient edge stability remains, reducing the need to return material for reprocessing.
3Productivity
If a steep compression gradient is used in the press for quicker compaction, then the productivity is improved, but the dissolution phenomena increase at the narrow sides
Solution Approach 1:
The compaction device performs preliminary compaction of the narrow sides before the material enters the press. This pre-compaction creates a more uniform density distribution and stabilizes the edge structure, allowing the press to use steep compression gradients for quick compaction without causing dissolution phenomena at the narrow sides.
Solution Approach 2:
The compaction device applies localized compaction specifically to the narrow sides of the pressed material mat, creating a region of excess edge density. This local quality enhancement at the edges provides structural stability that prevents dissolution during the steep compression gradient pressing operation, while the center region can still be compressed aggressively for productivity.
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 enhances edge stability, reduces material loss, and minimizes contamination by maintaining the integrity of the pressed material mat during transport and pressing, leading to improved production efficiency and product quality.
Implementation Method 1
the pressed material mat is compacted on its narrow sides during transport to the press by means of a compaction device by moving the narrow sides transversely to the production direction
Implementation Method 2
the narrow sides in the production direction in front of the compaction device with a Trimming device can be trimmed
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to a method, a plant and a device for producing material boards in a press (16) from spreading material (10), wherein a pressed-material mat (2) made of the spreading material (10) is spread by means of a spreading device (11) onto an endlessly circulating forming belt (23) and the pressed-material mat (2), during transport through the press (16), is compressed at its narrow sides (1) transversely to the production direction (22) by means of a compression device (6). The invention for the plant consists in that at least one compression device (6) for compressing the pressed-material mat (2) by displacing the narrow sides (1) in the direction of the longitudinal central axis of the pressed-material mat (2) and/or by compressing a region, adjoining the narrow sides (1), of the surface side of the pressed-material mat (2) is arranged between the press (16) and the spreading device (11). A device according to the invention has at least one means for compressing the pressed-material mat (2) by displacing the narrow sides (1) in the direction of the longitudinal central axis of the pressed-material mat (2) and/or by compressing a region, adjoining the narrow sides (1), of the surface side of the pressed-material mat (2).