Refining Segment Backflow Groove for Shive Reduction
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Solution Overview
Problem
Existing refining processes for lignocellulosic materials produce shives, which contaminate pulp quality and degrade refiner performance, necessitating a reduction in shive content without compromising pulp properties.
Innovation Solution
A refining segment with a backflow guide groove that collects and redirects backward-flowing fibrous material and shives back into the refining gap, enhancing the refining effect and reducing shive content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If refiners process lignocellulose-containing fibrous material, then pulp is produced, but shives are generated that contaminate pulp and degrade refiner performance
Solution Approach 1:
The invention converts the harmful backward-flowing shives into a beneficial recirculating feedstock. By providing a recirculating feed groove that collects shives from the refining gap and redirects them as feed material, the system transforms contamination into a resource, enabling continuous refining without shive accumulation or quality degradation.
Solution Approach 2:
Instead of discarding shives as waste or harmful byproduct, the invention recovers them through the recirculating feed groove system. The groove collects shives that would otherwise contaminate the pulp, and returns them to the refining process as feed material, achieving both contamination removal and resource recovery.
2Productivity
If shives accumulate on refining surfaces, then refiner capacity decreases, but removing shives requires additional processing steps
Solution Approach 1:
The refiner system performs self-cleaning and self-recycling through the recirculating feed groove. The groove automatically collects shives from the refining gap and redirects them as feed material, eliminating the need for external cleaning mechanisms or additional processing steps to remove shives. The system serves itself by converting its own contamination into a functional feedstock.
3Manufacturing precision
If refining is intensified to reduce shives, then pulp quality improves, but energy consumption increases
Solution Approach 1:
The recirculating feed groove enables continuous refining action by constantly returning shives as feed material. This continuous recirculation maintains consistent refining intensity without energy fluctuations, ensuring steady pulp quality improvement while avoiding the energy spikes that would result from intermittent intensive refining cycles.
Data Source
Figure 1~3
Figure 2
Figure 4A~4B
AI summary
A refining segment (4) for a refiner (1) for refining lignocellulose-containing fibrous material. The refining segment comprises an inner end edge (20) and an outer end edge (21) opposite to the inner end edge, and a refining surface (5) comprising refining bars (25) and refining grooves (26) therebetween. The refining surface comprises at least one recess (27, 27', 27") extending from the outer end edge of the refining segment at least partly towards the inner end edge for forming at least partly at least one backflow guide groove (28) extending from the outer end edge of the refining segment at least partly towards the inner end edge. A volume of the at least one recess is arranged to decrease towards the inner end edge for providing the volume of the at least one backflow guide groove to decrease towards the inner end edge.