Roll Cover Matrix with Multi-Scale Fillers for Abrasion Resistance
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Solution Overview
Problem
Existing roll covers for calendars and calendaring units face challenges in achieving high compressive modulus and abrasion resistance while maintaining low surface roughness and minimizing brittleness, as high filler content can lead to embrittlement and excessive surface roughness.
Innovation Solution
A roll cover matrix system incorporating at least three fillers with different median particle sizes, ranging from nanometers to micrometers, to enhance mechanical and thermal resistance, with specific particle size distributions and morphologies optimizing the combination of hardness, matrix attachment, and surface finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high filler content is used to achieve high abrasion resistance and compressive modulus, then abrasion resistance and compressive modulus are improved, but surface roughness increases and brittleness increases
Solution Approach 1:
The filler content is segmented into three distinct particle size ranges (nanometric <0.5μm, submicronic 0.5-5μm, and micronic >5μm), with each size range serving specific functions. The nanometric fillers provide crack resistance and compressive modulus without significantly increasing surface roughness, the submicronic fillers bridge between sizes and reduce matrix erosion, and the micronic fillers provide abrasion resistance while controlling surface topology
Solution Approach 2:
Different regions of the filler system have different properties optimized for different functions: nanometric fillers are distributed throughout the matrix to provide crack resistance and modulus, submicronic fillers are positioned to bridge gaps and protect the matrix, and micronic fillers are arranged to provide abrasion resistance while maintaining acceptable surface finish through controlled distribution
2Strength
If high filler content is used to achieve high compressive modulus, then compressive modulus is improved, but brittleness increases
Solution Approach 1:
The filler system is segmented into three particle size categories that work synergistically: nanometric fillers (<0.5μm, particularly 10-30 nm) provide crack resistance and increase compressive modulus without causing embrittlement, submicronic fillers (0.5-5μm) bridge the gap between sizes and reduce matrix erosion, and micronic fillers (>5μm, particularly 2-4 μm) provide additional compressive modulus and abrasion resistance while the overall distribution prevents excessive brittleness
Solution Approach 2:
The invention uses a composite filler system combining three different particle size ranges within the epoxy resin matrix, creating a multi-scale composite structure that achieves high compressive modulus (E ≥ 2.5 GPa) while maintaining acceptable toughness and resistance to embrittlement through the synergistic interaction of different filler sizes
Data Source
AI summary
A roll cover is particular suited for use in an apparatus for producing or surface finishing a fibrous web, such as a web of paper or of cardboard. The roll cover is formed on a roll core of metal or of a fiber-reinforced plastic and includes a matrix system wherein fillers are provided. The fillers provided are three or more in number and they have different median particle sizes.