Prismatoid Pulp Particles for Absorbent Fluid Management
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Solution Overview
Problem
Existing absorbent sanitary articles face challenges in managing liquids of varying viscosities, such as urine and menses, due to the high cost and complexity of designing effective acquisition/distribution layers that must be both flexible and non-compressible to prevent leakage while maintaining comfort and efficiency.
Innovation Solution
The use of general prismatoid-shaped particles cut from absorbent pulp sheets, which can be surface-treated with chemicals to enhance fluid absorption and distribution properties, providing improved acquisition and distribution of fluids across the absorbent article.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crosslinked pulp fiber or spun blown synthetic fibers are used in the acquisition/distribution member, then fluid acquisition and distribution capability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The invention changes the physical form parameter of pulp from conventional fibers to particles with controlled size (0.5-5.0 mm), shape (spheroidal, cylindrical, irregular), and density (0.2-0.8 g/cm³). These parameter changes enable the acquisition/distribution member to maintain bulk density under load while providing large void spaces for rapid fluid acquisition, eliminating the need for complex crosslinking or synthetic fiber processes
Solution Approach 2:
The invention uses conventional rolled sheet pulp (750 g/m² basis weight, 1.2 mm caliper) that is easily disintegrated into particles, replacing expensive crosslinked pulp or synthetic fibers. The particles are produced through simple mechanical disintegration and size classification, making the acquisition/distribution member inexpensive and suitable for disposable sanitary articles
2Reliability
If the acquisition/distribution member is designed to be non-compressible to prevent leakage, then fluid containment is improved, but wearer comfort decreases
Solution Approach 1:
The invention creates local quality differences within the acquisition/distribution member by using particles with varying densities and shapes. The particles pack to create regions of different compressibility: outer regions provide structural support and leakage prevention, while inner regions maintain large void spaces for fluid distribution. This local quality variation enables both fluid containment and wearer comfort
Solution Approach 2:
The invention creates a composite structure by combining pulp particles with different physical properties (size, shape, density) in a single acquisition/distribution member. This composite particle system provides both the non-compressible framework needed for leakage prevention and the flexible void spaces needed for comfort and fluid distribution
3Reliability
If large void spaces are created to accumulate high viscosity fluid, then fluid acquisition is improved, but manufacturing cost increases
Solution Approach 1:
The invention enables the pulp particles to self-organize into a structure with large void spaces through simple pouring or dispersal onto the storage member. The particles naturally pack to create interconnected void networks without requiring special equipment or complex processing. This self-organizing behavior creates large void spaces for high viscosity fluid accumulation using conventional manufacturing methods
Solution Approach 2:
The invention segments the acquisition/distribution member into numerous small particle units (0.5-5.0 mm) rather than using continuous fiber mats. This segmentation creates discrete particles that pack to form large interconnected void spaces, providing excellent high viscosity fluid acquisition capability while using simple particle production methods instead of complex structural design equipment
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
These particles enhance the absorbency and comfort of sanitary products by improving fluid acquisition and distribution, reducing leakage risks, and are cost-effectively manufactured, offering faster absorption and retention of fluids even under load.
Implementation Method 1
The acquisition/distribution member receives fluid and distributes and transfers the fluid to the storage member... This member will rapidly acquire and briefly contain low viscosity bodily fluids... providing improved acquisition and distribution of fluids
Implementation Method 2
crosslinked pulp fiber which will maintain its bulk density when wet and under a load... It should be of low compressibility to maintain these channels... The particles enhance the absorbency and comfort of sanitary products by improving fluid acquisition and distribution, reducing leakage risks, and are cost-effectively manufactured, offering faster absorption and retention of fluids even under load
Data Source
AI summary
A cellulose pulp particle having the shape of a general prismatoid having two parallel bases, the pulp particle comprising pulp fibers in a wet laid pulp sheet form, one of the bases having an area that is equal to or greater than the area of the other base, the area of the larger base being equal to or less than 35 mm2 and equal to or greater than 8 mm2, the distance between the bases being equal to or greater than 0.9 mm and equal to or less than 5 mm, the particle being treated with a material. In some embodiments the material can be a hydrophilic, hydrophobic or softening chemical or a film.