Composite Fibrous Layers for Surface Softness and Absorbency
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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 suffer from reduced surface properties, hygiene issues, and absorbency problems, and lack a solution for improved surface properties without these negatives.
Innovation Solution
A layered, optionally dispersible fibrous structure comprising multiple layers with different intensive properties, where a first layer of hydroxyl polymer or non-crystalline polymer fibrous elements is combined with a second layer of wood pulp fibers, enhancing surface and absorbent 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 surface properties are reduced too low and transfer to skin, leaving consumer feeling unclean
Solution Approach 1:
The fibrous structure is divided into multiple layers with different functions: a first layer provides structural support and absorbency, while a second layer provides the desired surface properties. This segmentation allows each layer to be optimized independently, achieving improved surface properties without the negatives of surface chemistry application.
Solution Approach 2:
The invention uses a composite fibrous structure combining different types of fibers in distinct layers. The first layer may contain wood pulp fibers for strength and absorbency, while the second layer contains fibers specifically selected to provide softness and skin-friendly surface properties without requiring chemical treatments.
2Ease of operation
If surface chemistries such as lotions and silicones are applied to fibrous structures, then surface properties are improved, but hygiene negatives and absorbency negatives occur
Solution Approach 1:
By separating surface functionality from the bulk structure through layered construction, the invention maintains hygiene and absorbency in the first layer while achieving improved surface properties in the second layer, eliminating the trade-offs associated with surface chemistry application.
Solution Approach 2:
Different regions of the fibrous structure are given different properties: the first layer is optimized for absorbency and structural integrity, while the second layer is optimized for surface softness and skin comfort. This local differentiation allows each function to be maximized without compromise.
3Ease of manufacture
If a single-layer fibrous structure is used, then manufacturing is simpler, but surface and absorbent properties cannot be simultaneously optimized
Solution Approach 1:
The fibrous structure is segmented into multiple layers that can be manufactured using standard multi-layer web formation equipment. Each layer can be produced with its own fiber composition and properties, then combined in a single manufacturing process, maintaining ease of manufacture while enabling property optimization.
Data Source
AI summary
Layered, and optionally dispersible fibrous structures containing two or more layers that exhibit different common intensive properties, sanitary tissue products employing such layered, optionally dispersible fibrous structures, and methods for making same are provided.