Compacted Fibrous Structure With Differential Density
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Solution Overview
Problem
Existing compacted fibrous structure articles exhibit high stiffness, low absorbency, and poor softness due to uniform density and thickness, making them difficult to open and use effectively.
Innovation Solution
A compacted fibrous structure article with differential density and thickness, featuring a fibrous structure with regions of varying density and thickness, including a tab for easy opening, is developed using a method that involves folding and compressing pulp fibers to create a non-cylindrical form with a visible tab for grasping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the fibrous structure is compressed into uniform high density and uniform low thickness, then the compacted form is achieved, but the stiffness becomes extremely high and absorbency decreases
Solution Approach 1:
The patent applies local quality by creating regions of different density within the compacted fibrous structure. The compression is applied non-uniformly, resulting in a gradient where the center region has lower density and the peripheral regions have higher density. This local variation in density allows the product to maintain compact form while preserving flexibility and absorbency in the lower density center region.
2Volume of stationary object
If the fibrous structure is compressed into uniform high density, then the compact form is achieved, but the softness becomes less than desirable
Solution Approach 1:
The patent creates a non-uniform density distribution where the center region maintains lower density and higher softness, while the periphery provides structural support through higher density. This local differentiation preserves the softness needed for comfort while achieving overall compactness.
3Volume of stationary object
If the fibrous structure is compressed into uniform high density, then the compact form is achieved, but the reopenability becomes difficult
Solution Approach 1:
The lower density center region acts as a preferred expansion zone during reopening. When the compacted product is activated (e.g., by water or heat), the less compressed center region expands more readily, providing a natural opening mechanism that improves reopenability while maintaining overall compactness for storage.
4Volume of stationary object
If the fibrous structure is compressed into uniform low thickness, then the compact form is achieved, but the absorbency becomes less than desirable
Solution Approach 1:
The non-uniform compression creates a density gradient that preserves porosity and absorbent capacity in the lower density center region. The higher density peripheral regions provide structural integrity, while the center region maintains the void space necessary for liquid absorption, thus preserving overall absorbency while achieving compactness.
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 solution results in a product with lower stiffness, higher absorbency, and improved softness, allowing for easier opening and use, as the differential density and thickness design enhances reopenability and usability.
Implementation Method 1
contacting the compacted fibrous structure article with water, for example from a faucet, such that the compacted fibrous structure article swells and expands
Data Source
AI summary
Compacted fibrous structure articles and methods for making the same are provided.