Refiner Blade Segment With Openings For Fibrous Material
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Solution Overview
Problem
Existing refiners for fibrous materials face inefficiencies in guiding material into the refiner chamber and removing refined material without compromising production capacity, particularly when using blade bars and blade grooves, as previous solutions either fail to improve guidance significantly or diminish hydraulic capacity.
Innovation Solution
Incorporating openings on one or both refining surfaces that cover 10-40% of the total surface area, allowing fibrous material to be fed into the refiner chamber efficiently and refined material to be removed effectively, thereby enhancing the even distribution and processing capacity within the refiner chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If openings are added to the refining surface to improve material distribution and reduce blockages, then the evenness of material distribution and reliability improve, but the hydraulic capacity and productivity may be compromised
Solution Approach 1:
The refining surface is designed with non-uniform opening distribution - openings are strategically placed in specific zones (e.g., feed zones, discharge zones) rather than uniformly across the entire surface. This allows different regions to serve different functions: some areas promote material distribution and blockage prevention, while others maintain hydraulic capacity for high productivity.
Solution Approach 2:
The opening parameters (size, shape, density, orientation) are optimized to achieve the desired balance. By controlling the total opening area ratio (openings divided by total refining surface area) within specific ranges, the design ensures sufficient material distribution while maintaining adequate hydraulic capacity for production requirements.
2Productivity
If the total area of openings is increased to improve material feeding efficiency, then the productivity and evenness of distribution improve, but the structural integrity and hydraulic capacity may deteriorate
Solution Approach 1:
The design optimizes the opening area ratio parameter - the total area of openings divided by the total refining surface area is controlled within specific ranges (e.g., 5-30%, or more specifically 10-20%). This parameter optimization ensures sufficient material distribution and feeding efficiency while maintaining adequate structural integrity and hydraulic capacity.
Solution Approach 2:
Different regions of the refining surface have different opening densities and configurations. Areas requiring high material distribution have larger or more numerous openings, while areas requiring high hydraulic capacity have smaller or fewer openings, creating a spatially varying structure that balances competing requirements.
Data Source
Figure 1~2
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AI summary
A refiner (1, 18, 19) for refining fibrous material comprises at least one first refining surface (11) and at least one second refining surface (4), which are arranged at least partly substantially opposite to one another in such a manner that a refiner chamber (12) is formed between them, to which the material to be defibrated is arranged to be fed. The first refining surface or the second refining surface comprises openings formed through them and through which fibrous material to be refined can be fed into the refiner chamber or through which refined fibrous material can be removed from the refiner chamber. In addition, a method for refining fibrous material, a refining surface of a refiner and a blade segment for a refiner.