Pulpless Absorbent Core Formation via Controlled Particulate Deposition
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Solution Overview
Problem
Conventional absorbent cores with cellulose fibers have high bulk due to their absorbent capacity, making pulpless absorbent cores with reduced cellulose fiber content desirable for minimizing bulk while maintaining high absorbent properties.
Innovation Solution
A method for forming pulpless absorbent cores involves advancing a carrier sheet on a foraminous forming surface, creating a pressure differential, and depositing particulate material, such as superabsorbent material, using a particulate material delivery chamber with controlled width and velocity to achieve uniform distribution and high central basis weight, reducing the need for cellulose fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cellulose fibers are used to provide absorbent capacity, then absorbent properties are improved, but bulk increases
Solution Approach 1:
The patent changes the material composition parameters by replacing cellulose fibers with superabsorbent particulate material, altering the physical and chemical properties of the absorbent core to achieve high absorbency with reduced bulk
Solution Approach 2:
The patent creates a composite structure combining superabsorbent particles with a minimal amount of cellulose fibers or alternative materials, achieving both high absorbent capacity and reduced bulk through material composition optimization
2Productivity
If superabsorbent material is deposited at high velocity, then productivity is improved, but distribution uniformity deteriorates
Solution Approach 1:
The patent employs a dynamic delivery system that can adjust particulate material velocity, allowing optimization between productivity and distribution uniformity by controlling the speed at which superabsorbent material is deposited onto the carrier sheet
Solution Approach 2:
The system incorporates feedback mechanisms to monitor and adjust the deposition process, ensuring that superabsorbent material is distributed uniformly across the carrier sheet while maintaining high deposition speeds for improved productivity
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
The method produces absorbent cores with reduced thickness and high absorbent capacity, similar to cores with higher cellulose fiber content, but with less bulk, effectively addressing the issue of bulkiness in conventional absorbent cores.
Implementation Method 1
creating a pressure differential across the forming surface
Implementation Method 2
applying a first adhesive onto the carrier sheet... deposit the particulate material onto the first adhesive
Data Source
AI summary
Pulpless absorbent cores and methods of manufacture are disclosed. A first method for forming an absorbent core may comprise advancing a carrier sheet on a foraminous forming surface in a machine direction, the foraminous forming surface having a width extending in a cross-machine direction, creating a pressure differential across the forming surface, applying a first adhesive onto the carrier sheet, advancing the carrier sheet within a particulate material delivery chamber, and dispensing particulate material from a particulate material inlet within the particulate material delivery chamber to deposit the particulate material onto the first adhesive, wherein the particulate material inlet has a width that is between 25% and 75% of the foraminous forming surface width, and wherein the particulate material is delivered from the particulate material inlet at less than 900 meters per minute.