Fibrous Structures Different Fibrous Elements
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Solution Overview
Problem
Current sanitary tissue products with rough fibrous structures, when treated with surface chemistries like lotions or silicones, often result in negative consumer experiences such as skin irritation and hygiene issues due to the transfer of these chemicals, and fail to provide improved surface properties without associated drawbacks.
Innovation Solution
A layered, optionally dispersible fibrous structure comprising a smooth exterior layer of spun fibrous elements and a rough exterior layer of wood pulp fibers, thermally bonded to enhance surface properties without the use of surface softening agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If surface chemistries such as lotions and silicones are applied to rough fibrous structures, then surface properties are improved, but hygiene negatives and skin irritation occur due to chemical transfer
Solution Approach 1:
The patent removes harmful surface chemistries (lotions, silicones, quaternary ammonium compounds) from the fibrous structure while retaining the desired surface properties through physical fiber modification instead. The rough fibrous structure is treated to eliminate chemical softening agents that cause skin irritation and hygiene issues, achieving a chemistry-free surface that still provides improved glide and comfort.
Solution Approach 2:
The patent changes the physical parameters of the fibrous structure itself rather than applying chemical modifications. By altering fiber diameter, length, curl, and surface texture through mechanical means, the patent achieves improved surface properties without introducing harmful chemicals that transfer to skin.
2Ease of operation
If surface chemistries such as lotions and silicones are applied to rough fibrous structures, then surface properties are improved, but absorbency is reduced
Solution Approach 1:
The patent extracts/removes surface chemistries that interfere with absorbency while maintaining surface comfort through physical fiber characteristics. By eliminating lotions and silicones that coat the fibers, the natural absorbency of the fibrous structure is preserved and enhanced.
Solution Approach 2:
The patent modifies physical parameters of the fibers (diameter, length, curl, surface texture) to improve surface properties without introducing chemicals that would block absorbency. The fiber morphology is changed to provide both comfort and absorbency simultaneously.
3Ease of manufacture
If a rough fibrous structure is used, then manufacturing is simpler, but consumer comfort is reduced due to skin irritation
Solution Approach 1:
The patent applies different fiber characteristics to different regions or layers of the fibrous structure. The surface layer contains fibers with specific properties (smoother texture, appropriate diameter) that provide consumer comfort, while the bulk structure maintains the simplicity of rough fibrous material for easy manufacturing.
Solution Approach 2:
The patent creates a composite fibrous structure combining fibers with different properties - some fibers provide structural integrity and ease of manufacture, while surface fibers provide comfort and reduced skin irritation. This composite approach achieves both manufacturing simplicity and consumer comfort.
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 fibrous structure exhibits improved glide on skin properties and cleaning performance, providing better absorbency and skin benefits without a gooey feel, while avoiding the negatives associated with traditional surface chemistries.
Implementation Method 1
the fibrous structure exhibits improved glide on skin properties
Implementation Method 2
providing better absorbency
Data Source
AI summary
Layered, and optionally dispersible fibrous structures containing fibrous elements that exhibit different physical characteristics, such as different average diameters as measured by the Average Diameter Test Method described herein, different surface characteristics, different lengths, different sources (naturally occurring versus non-naturally occurring and/or spun versus non-spun), sanitary tissue products employing such layered, dispersible fibrous structures, and methods for making same are provided.