Intermeshing Disperser Plates With Outer Refining Control

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Solution Overview

Problem

Existing technologies have not efficiently addressed the need for dispersers to disperse and refine fibers to a desired quality while providing control over the amount of refining in a single pass, leading to wasted time and energy.

Innovation Solution

A disperser-refiner plate segment with intermeshing teeth and an outer refining section, where the teeth are taller than the refining bars, allowing for adjustable gaps to control refining intensity while maintaining dispersion efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a disperser uses only intermeshing teeth for dispersion, then dispersion efficiency is maintained, but refining capability is insufficient

Engineering Contradiction:

Improvedispersion efficiencyVSAvoidrefining capability

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent combines dispersion teeth and refining bars into a single plate segment structure. The dispersion section contains intermeshing teeth for breaking down contaminants, while the outer refining section contains refining bars that work against the stator to provide fiber refining. This merging allows both dispersion and refining functions to be performed in one pass through the disperser.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The plate segment is divided into two distinct functional sections: an inner dispersion section with intermeshing teeth and an outer refining section with refining bars. This segmentation allows each section to perform its specific function optimally while being integrated into a single component.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If additional refining equipment is added after the disperser, then fiber refining quality improves, but processing time and energy consumption increase

Engineering Contradiction:

Improvefiber refining qualityVSAvoidprocessing time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent merges the disperser and refiner functions into a single unit. The disperser apparatus includes both dispersion teeth for contaminant removal and refining bars for fiber refining, eliminating the need for separate refining equipment and reducing processing time and energy consumption.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The disperser plate segment is designed to perform multiple functions: dispersion of contaminants in the inner section and refining of fibers in the outer section. This multi-functionality allows a single piece of equipment to accomplish what previously required multiple separate devices.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Strength

If the gap between rotor and stator is increased to reduce fiber cutting, then fiber integrity is maintained, but refining intensity decreases

Engineering Contradiction:

Improvefiber integrityVSAvoidrefining intensity

Core Design Contradiction:

StrengthVSPower

Solution Approach 1:

The patent applies different gap characteristics to different sections of the plate segment. The dispersion section has a larger gap to prevent fiber cutting and maintain integrity, while the outer refining section has a smaller gap between refining bars to provide intense refining action. This local differentiation allows both fiber integrity and refining intensity to be optimized in their respective zones.

Inventive Principle:

Principle #3Local quality

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

Enables precise control over refining energy application while maintaining consistent dispersion, improving fiber quality and reducing the need for additional refining equipment.

Implementation Method 1

The teeth typical take the shape of a geometric prism, such as a square, trapezoidal, or pyramidal prism. The teeth protrude from one side of the disc segment in rows or bands. The rows of teeth on one disc intermesh with rows of teeth on the facing disc. This intermeshing creates a circuitous gap between the opposing dispersing sections.

Methodology Applied

Scientific EffectShear stress: Shear Stress

Implementation Method 2

Whereas dispersion flexes the entire tube-like fiber itself, 'refining' subjects the fibers to significantly more frictional and compression energy. As a result, refining delaminates the fibers and frays the fibrils that comprise the lamellae, thereby increasing the surface area of the fibers.

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 3

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentEP3550072B1Disperser plates with intermeshing teeth and outer refining section

Publication Date: 2025.12.17 ANDRITZ INC

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Figure 2A

AI summary

A disperser-refiner plate segment (100, 100'; 200, 200') comprises a refining section (135, 135'; 235, 235') disposed radially outward from a dispersion section (125, 125'; 225, 225'), wherein a height (230, 230') of the teeth (120, 120'; 220, 220') in the dispersion section (125, 125'; 225, 225') exceeds a height (250, 250') of the bars (140, 140'; 240, 240') in the refining section (135, 135'; 235, 235'). Disperser-refiner plate segments (100, 100'; 200, 200') as described herein will allow operators to combine dispersion with refining and give operators greater control over the level of dispersion while minimally affecting the level of refining.