Fibrous Structure Knuckle Pattern Absorbency Firmness Trade-off
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Solution Overview
Problem
Fibrous structures, such as paper towels and bath tissues, face challenges in achieving both superior performance properties like absorbency and strength while maintaining aesthetic appeal and firmness, as these goals often contradict each other, and existing methods struggle to produce rolls with high bulk and low compressibility.
Innovation Solution
A fibrous structure with a pattern of discrete knuckles arranged in a specific repeat unit pattern, where each knuckle has the same shape and size but varying distances between them, creating varying pillow widths along rows, which enhances both performance and visual appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If processing parameters such as papermaking belt structure or emboss pattern are optimized for superior absorbency and strength, then performance properties are improved, but visual aesthetic qualities deteriorate
Solution Approach 1:
The patent applies local quality by creating a papermaking belt with varying cell characteristics - some cells have larger openings for enhanced absorbency while others have smaller openings for aesthetic appearance. The belt includes different cell types (first cells and second cells) with distinct properties in different locations, allowing simultaneous optimization of performance and appearance in different regions of the same belt structure
2Volume of stationary object
If the fibrous structure roll is wound loosely to increase roll bulk, then roll bulk is improved, but firmness deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the physical and chemical properties of the fibrous structure itself - specifically by controlling basis weight, fiber composition, and internal bonding characteristics. These parameter changes enable the roll to maintain high bulk while achieving low compressibility and high firmness through intrinsic material properties rather than winding tension
3Reliability
If high basis weight fibrous structure sheet is used to provide greater absorbency and strength, then performance properties are improved, but roll firmness and low compressibility become more difficult to achieve
Solution Approach 1:
The patent applies composite materials by combining different fiber types (cellulosic and non-cellulosic) with different properties in a single fibrous structure. This composite approach allows the material to exhibit multiple characteristics simultaneously - high absorbency from cellulosic fibers, strength from non-cellulosic fibers, and controlled compressibility through the synergistic interaction of different fiber components
Data Source
AI summary
A fibrous structure is disclosed. The fibrous structure exhibits a plurality of discrete knuckles arranged in a pattern of repeat units. The repeat units can include a plurality of rows arranged orthogonally in an X-Y plane, each row having a portion of the discrete knuckles, and each discrete knuckle separated from adjacent discrete knuckles in a row by a distance. Each of the discrete knuckles within the repeat unit can have substantially the same shape and size; and wherein the distance between at least two adjacent discrete knuckles in each row are non-uniform such that the repeat unit exhibits varying pillow width distances along the rows in both the X and Y axes.