Refiner Plate Segment with Gradual Radial Transition

Solution Overview

Problem

Conventional refiner plates suffer from energy inefficiency and uneven fiber distribution due to radial transition zones that cause fiber accumulation and over-refining, leading to increased energy consumption and reduced fiber quality.

Innovation Solution

A refiner plate design with a spiraling, continuous transition zone that gradually changes bar and groove dimensions from the axis of rotation to the periphery, eliminating radial fiber build-ups and ensuring even distribution without sharp transitions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional refiner plates use distinct annular refining regions with constant bar and groove designs, then the structure is simple and easy to manufacture, but fiber accumulation occurs at transition zones leading to uneven fiber distribution and increased energy consumption

Engineering Contradiction:

Improverefiner plate structureVSAvoidenergy consumption

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The refiner plate is divided into multiple segments or sectors that can be attached side-by-side to form a complete plate. Each segment contains transition zones that collectively create a gradual, distributed transition pattern across the entire plate surface, preventing localized fiber accumulation while maintaining manufacturing simplicity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different segments of the refiner plate have different bar and groove configurations optimized for their specific radial positions. The transition zones are strategically designed in specific segments to create a gradual overall transition pattern, allowing each local area to have optimized geometry while contributing to a gradual global transition that prevents fiber buildup

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If conventional refiner plates use distinct annular refining regions with constant bar and groove designs, then manufacturing is simplified, but fiber quality becomes uneven due to over-refining in accumulation areas

Engineering Contradiction:

Improverefiner plate structureVSAvoidfiber quality uniformity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The refiner plate is divided into multiple segments or sectors that can be attached side-by-side to form a complete plate. Each segment contains transition zones that collectively create a gradual, distributed transition pattern across the entire plate surface, preventing localized fiber accumulation while maintaining manufacturing simplicity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different segments of the refiner plate have different bar and groove configurations optimized for their specific radial positions. The transition zones are strategically designed in specific segments to create a gradual overall transition pattern, allowing each local area to have optimized geometry while contributing to a gradual global transition that prevents fiber buildup

Inventive Principle:

Principle #3Local quality

3Productivity

If bar and groove patterns change abruptly from coarse to fine, then the refining action is more intensive, but fiber accumulation occurs leading to over-refining and fiber cutting

Engineering Contradiction:

Improverefining intensityVSAvoidfiber quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The refiner plate design creates a dynamic, gradual transition pattern where the bar and groove density increases progressively from the inner radius to the outer radius. This dynamic progression allows fiber to be gradually refined through multiple stages rather than subjected to abrupt intensive refining, preventing over-refining and fiber cutting while maintaining high overall productivity

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The transition zones are positioned and configured to create a preliminary gradual refinement stage before material reaches the high-density outer refining zones. This preliminary action prepares the fiber for the intensive refining that follows, ensuring smooth progression and preventing sudden fiber accumulation that would lead to over-refining

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4365367B1Refiner plate segment with gradually changing geometry

Publication Date: 2025.09.10 ANDRITZ INC

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AI summary

A refiner plate segment (10, 210, 310, 710, 810) for mounting on a refiner disc, wherein the density of bars (30, 230, 730, 830) becomes greater moving radially from a band nearest an inner arc (70, 270) of the refiner plate segment (10, 210, 310, 710, 810) to a band nearest an outer periphery thereof across any transition zone (55, 755, 855) in a direction from the inner arc (70, 270) towards the outer periphery (90, 290, 790, 890), and wherein a pattern of bars (30, 230, 730, 830) and grooves (40, 840) also becomes denser within at least one band (50a...c, 850a...c) moving from the portion of the band nearest the inner arc (70, 270) to the portion of the band nearest the outer periphery (90, 290, 790, 890).