Forming Belt for High-Resolution Patterned Nonwovens
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Solution Overview
Problem
There is a need for improved nonwoven fabrics with high visual resolution and forming belts capable of producing such fabrics, particularly for absorbent articles, that exhibit visually discernible three-dimensional surface features with differential properties like thickness, basis weight, or volumetric density, which existing technologies have not adequately addressed.
Innovation Solution
A forming belt is used to produce nonwoven fabrics with continuous spunbond filaments in a single process, allowing for the creation of shaped fabrics with regular, repeating patterns of three-dimensional features that differ in properties, such as basis weight or density, which are beneficial for personal care, medical, and cleaning products, by depositing fibers directly onto a forming belt with corresponding patterns and using melt spinning and thermal bonding techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional nonwoven fabrics are produced with patterned surfaces, then visual appearance is improved, but visual resolution remains low with faded and fuzzy lines
Solution Approach 1:
The forming belt incorporates zones with different air permeability properties (high air permeability zones versus low air permeability zones) to create localized variations in fiber deposition. This local quality difference enables the formation of distinct patterned regions with sharp boundaries, achieving high visual resolution while maintaining aesthetic appeal.
2Loss of energy
If nonwoven fabrics are compressed for packaging, then distribution costs are reduced, but compression recovery is poor leading to loss of three-dimensional features
Solution Approach 1:
The patent utilizes thermal energy as a parameter to bond fibers at specific locations on the forming belt. By applying heat to create bonded regions, the fabric develops elastic recovery properties that enable it to rebound from compression, maintaining three-dimensional features while still allowing for cost-effective compressed packaging.
3Adaptability or versatility
If multiple processing steps are used to create patterned nonwovens, then functional properties are improved, but production complexity increases
Solution Approach 1:
The invention combines fiber deposition, pattern formation, and fiber bonding into a single integrated forming belt process. The forming belt simultaneously performs multiple functions: it deposits fibers, creates patterns through varying air permeability zones, and bonds fibers through thermal energy. This merging of operations reduces production complexity while maintaining diverse functional properties.
Solution Approach 2:
The forming belt is designed as a universal component that performs multiple functions: it serves as the deposition surface, the pattern-making tool, and the bonding agent. This multi-functionality eliminates the need for separate processing equipment and steps, simplifying the overall production system while enabling complex patterned nonwoven fabrics with varied functional 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
The resulting nonwoven fabrics exhibit improved compression recovery, aesthetic appeal, and functional benefits like enhanced absorbency and softness, while maintaining their structure even after compression packaging, reducing in-bag stack height and distribution costs.
Implementation Method 1
depositing fibers directly onto a forming belt with corresponding patterns
Implementation Method 2
using melt spinning and thermal bonding techniques
Implementation Method 3
using melt spinning and thermal bonding techniques
Data Source
Figure 1~2
Figure 3~4
Figure 5A~6
AI summary
A forming belt for producing a nonwoven fabric is disclosed. The produced nonwoven fabric can include a first surface and a second surface and at least a first visually discernible zone of three-dimensional features on one of the first or second surface. Each of the three-dimensional features can define a microzone comprising a first region and a second region. The first and second regions can have a difference in values for an intensive property, and the first visually discernible zone can exhibit a high visual resolution.