Fluff Pulp Sheet Composition for Low Liquid Backflow
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Solution Overview
Problem
Conventional pulp sheets for fluff pulp do not adequately reduce liquid backflow percentage, which is a critical issue in absorbent articles like disposable diapers and sanitary napkins.
Innovation Solution
A pulp sheet for fluff pulp comprising hardwood pulp with specific characteristics such as a hardwood pulp content of 25% by mass or more, controlled fatty acid content, and optimized properties like ISO brightness, viscosity, and fiber length, which collectively enhance defibration properties and reduce liquid backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pulp sheets containing bleached hardwood pulp and bleached softwood pulp are used, then the pulp sheet can be manufactured with good defibration properties, but the liquid backflow percentage in the resulting fluff mat is not sufficiently reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the hardwood pulp content (25-100% by mass) and the kappa number (0.5-2.0) to optimize both defibration properties and liquid backflow reduction. This quantitative parameter control resolves the contradiction by finding the optimal balance point where both requirements are satisfied simultaneously.
Solution Approach 2:
The patent uses composite materials by combining hardwood pulp with specific properties (controlled kappa number and fatty acid content) in a predetermined ratio with softwood pulp. This composite approach allows the fluff mat to achieve both good defibration characteristics and reduced liquid backflow, as the hardwood component contributes to liquid retention while the softwood provides defibration ease.
2Reliability
If the hardwood pulp content is increased to reduce liquid backflow, then the liquid retention performance improves, but the defibration difficulty increases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by controlling the kappa number of hardwood pulp within a specific range (0.5-2.0). This parameter control ensures that the hardwood pulp has appropriate fibrillation characteristics, allowing it to contribute to liquid retention while maintaining defibration ease, thus preventing excessive defibration difficulty even at higher hardwood content levels.
Solution Approach 2:
The patent applies local quality by specifying particular properties for the hardwood pulp component (kappa number 0.5-2.0 and controlled fatty acid content) rather than using hardwood pulp with arbitrary properties. This localized quality control ensures that only hardwood pulp meeting specific criteria is used, optimizing both liquid retention and defibration characteristics.
3Illumination intensity
If the kappa number of hardwood pulp is reduced to improve brightness, then the ISO brightness increases, but the fiber strength may be compromised
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing an optimal kappa number range (0.5-2.0) for hardwood pulp. This parameter optimization achieves high ISO brightness (80% or more) while maintaining adequate fiber strength, as the controlled kappa number ensures proper delignification without excessive fiber degradation.
Data Source
Figure 1
AI summary
It is an object of the present invention to provide a pulp sheet for fluff pulp, capable of forming a fluff pulp (fluff mat) having a sufficiently reduced liquid backflow percentage. The present invention relates to a pulp sheet for fluff pulp, comprising a hardwood pulp, wherein the content of the hardwood pulp is 25% by mass or more, with respect to the total pulp components in the pulp sheet for fluff pulp, and the total content of straight-chain fatty acid containing 24 carbon atoms, straight-chain fatty acid containing 26 carbon atoms and straight-chain fatty acid containing 28 carbon atoms in the pulp sheet for fluff pulp is 300 to 1000 ppm.