Nonwoven Thermal Bonding Pattern for Low Fuzz
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Solution Overview
Problem
Existing thermal bonding patterns for nonwovens in absorbent articles often result in a high amount of broken fibers (fuzz) that can cause abrasion and reduce the quality perception, particularly due to insufficient bonding in the machine direction.
Innovation Solution
A thermal bonding pattern with specific characteristics, including bonds disposed in parallel rows at a pitch angle of 0.5° to 15°, a bonding area of 17% to 30% of the nonwoven area, a combination of larger and smaller bonds with different individual areas, and elongated bonds oriented in different directions, to enhance fiber alignment and bonding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional thermal bonding patterns are applied to nonwovens, then fiber bonding is achieved, but a large amount of broken fibers (fuzz) stick out of the surface
Solution Approach 1:
The bonding pattern applies different bond characteristics (size, shape, density) to different regions of the nonwoven fabric. Larger bonds are positioned in areas requiring stronger anchoring to prevent fiber pull-out, while smaller bonds are used in regions where excessive fuzz would be problematic. This localized variation in bond quality optimizes the balance between bonding strength and fuzz reduction.
Solution Approach 2:
The thermal bonding process is applied before the nonwoven undergoes abrasion during wear. By pre-bonding the fibers in a controlled manner that minimizes loose ends and protruding fibers, the fabric is prepared in advance to resist fuzz formation during subsequent use and abrasion.
2Stability of the object's composition
If thermal bonding is applied to consolidate nonwovens, then fiber alignment and structure are improved, but broken fibers increase due to abrasion
Solution Approach 1:
The bonding pattern utilizes variations in bond parameters including size (ranging from small to large bonds), density (number of bonds per unit area), and distribution pattern. These parameter changes create a gradient of bonding strength that accommodates fiber alignment requirements while minimizing the creation of loose fiber ends that would become fuzz during abrasion.
3Object-generated harmful factors
If bonding area is increased to reduce fuzz, then fiber bonding improves, but softness and flexibility may be compromised
Solution Approach 1:
Instead of uniformly bonding the entire nonwoven surface, the invention applies bonding selectively to specific regions and at specific densities. The bonding area is optimized to be sufficient to prevent fuzz formation in critical areas, but not so extensive as to compromise the overall softness and flexibility of the fabric. This partial bonding approach achieves the minimum necessary bonding to reduce fuzz while preserving comfort properties.
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
This bonding pattern effectively reduces the length of broken fibers sticking out of the nonwoven surface (fuzz) while maintaining softness, flexibility, integrity, and absorbency, improving the overall quality and performance of absorbent articles.
Implementation Method 1
One of the roll may be heated so that enough heat is applied to the web to locally melt the fibers of the web according to the desired thermal bonding pattern
Data Source
AI summary
A nonwoven comprising a pattern of thermal bonds with anti-fuzz properties according to at least three and preferably all four of the following conditions: a) the pattern comprises thermal bonds disposed in parallel rows having a pitch angle (P) of from 0.5° to 15° relative to the machine direction or the cross-machine direction; and/or b) the bonding area of all the thermal bonds ranges from 17% to 30% of the area of the nonwoven, and/or c) the pattern comprises larger bonds and smaller bonds having different individual area, and/or d) the pattern comprises elongated bonds having different major directions.