Discrete cell arrangements
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Solution Overview
Problem
Fibrous structures, such as sanitary tissue products, often face a contradiction between achieving superior performance properties like softness, strength, and absorbency, and consumer-desired aesthetics, with existing papermaking belts and embossing processes either compromising on smoothness or visual appeal.
Innovation Solution
A fibrous structure design featuring discrete wet-formed knuckles with a saddle and legs, and a pillow surface with specific geometric ratios, created using a papermaking belt with a pattern of cured resin knuckles and pillows, combined with an embossing process to enhance both performance and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional papermaking belts and embossing processes are used, then manufacturing simplicity is maintained, but product performance properties (softness, smoothness, strength, absorbency) and aesthetics are compromised
Solution Approach 1:
The papermaking belt is segmented into discrete knuckles with multiple legs (typically 3-6 legs per knuckle) rather than continuous embossing patterns. Each knuckle is a separate structural element with defined geometry (saddle height, leg length, leg width), allowing independent optimization of performance properties while maintaining manufacturability through modular belt design
Solution Approach 2:
Different regions of the fibrous structure are given different properties through the knuckle-pillow pattern. Knuckles provide localized density and structural support, while pillows provide compressibility and absorbency. The leg separation distances and saddle heights are optimized locally to achieve desired surface smoothness, bulk, and liquid uptake in specific areas
2Shape
If smooth surface is achieved through traditional embossing, then aesthetic appeal is improved, but liquid uptake and absorbency performance deteriorates
Solution Approach 1:
The fibrous structure incorporates a network of interconnected pillows and knuckles that create a porous three-dimensional architecture. This porous structure provides capillary channels for rapid liquid wicking and uptake while the knuckle legs bridge surface gaps to maintain visual smoothness. The pillow regions between knuckles act as reservoirs that absorb and hold liquid
Solution Approach 2:
The embossing pattern creates three-dimensional knuckle structures with vertical height (saddle height) and leg extensions that add depth to the surface topology. This multi-dimensional structure allows the surface to appear smooth from a distance while providing complex internal pathways for liquid transport at the micro-scale
3Shape
If discrete knuckle structures with specific geometric ratios are implemented, then cloth-like feel and bulk are improved, but manufacturing precision requirements increase
Solution Approach 1:
Specific geometric parameter ranges are defined for the knuckle structures to achieve cloth-like properties: leg separation distance ratios of 0.050-0.99 relative to distance between saddles, and leg length to saddle height ratios of 1.02-24.0. These parameter ranges provide manufacturing tolerances while ensuring the desiredEmtec TS7, flexural rigidity, bulk, and visual appearance properties are achieved
Solution Approach 2:
The knuckles feature curved saddle regions and rounded leg transitions rather than sharp angles, creating a more natural cloth-like surface topology. The curved geometry distributes stress more evenly and provides a softer hand feel while the smooth transitions are easier to manufacture with standard embossing tools
Data Source
AI summary
Belts and fibrous structures of the present disclosure may comprise discrete cells comprising one or more legs and/or one or more concavities in certain patterns or Cell Groups. The cells may be discrete knuckles or pillows and the fibrous structures may further comprise an emboss.