Nonwoven Protrusions with Differential Opacity for Compression Stability
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Solution Overview
Problem
There is a need for nonwoven materials with well-defined three-dimensional features that remain visible and functional even after compression, particularly in absorbent articles, which are soft, dry, and effective in liquid acquisition, and can be produced at high speeds using cost-effective methods.
Innovation Solution
The development of nonwoven materials with protrusions that have a cap portion wider than the base opening, formed by mechanically deforming a precursor web between forming members with discrete male and female elements, allowing the protrusions to collapse in a controlled manner while maintaining open base openings, and varying fiber concentration and thermal point bonds across layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If three-dimensional features are formed in nonwoven materials to improve softness and dryness, then the visual signal and liquid acquisition properties are enhanced, but the features tend to collapse or close when subjected to compressive forces during manufacturing or packaging
Solution Approach 1:
The three-dimensional features are segmented into multiple discrete protrusions distributed across the nonwoven material surface. Each protrusion is an independent structural element with its own base opening, allowing localized deformation without compromising the entire structure. This segmentation enables the material to maintain overall feature integrity while accommodating compression forces through distributed, independent response of each protrusion element.
Solution Approach 2:
The nonwoven material exhibits local quality variations through differential fiber concentration and bonding patterns. Regions surrounding the base openings have modified fiber distribution and thermal point bond characteristics, creating zones of controlled mechanical properties. This local quality enhancement ensures that the critical base opening regions maintain their structural integrity and remain open under compression, while other areas of the material can deform as needed.
2Productivity
If nonwoven materials are manufactured at high line speeds to improve productivity, then manufacturing efficiency increases, but it becomes increasingly difficult to form well-defined three-dimensional features
Solution Approach 1:
The three-dimensional protrusion features are formed as integral parts of the nonwoven material during the web formation process itself, before the material undergoes subsequent manufacturing steps. The male and female forming elements create the protrusions and base openings in the precursor web, establishing the three-dimensional structure in advance. This preliminary formation of features allows high-speed manufacturing to proceed without requiring additional post-processing steps that would compromise feature quality or reduce productivity.
Solution Approach 2:
The patent replaces complex mechanical forming systems with a simplified thermal point bonding mechanism. Instead of using mechanical pressure and complex tooling to form and set three-dimensional features at high speeds, the invention uses controlled thermal bonding through male and female forming elements. This substitution of mechanical forming with thermal bonding enables well-defined feature formation at high line speeds, as the thermal process acts quickly and uniformly on the moving web without requiring complex mechanical positioning or holding systems.
3Ease of manufacture
If mechanical deformation methods are used to form three-dimensional features, then production costs are reduced compared to hydroentangling and hydromolding, but the features may not maintain their three-dimensional character after compression
Solution Approach 1:
The invention changes the physical parameters of the nonwoven material locally through controlled thermal point bonding. By applying heat and pressure through the male and female forming elements, the fibers in specific regions are bonded together at elevated temperatures, creating thermally bonded zones that lock in the three-dimensional protrusion structure. This parameter change (thermal bonding) provides the mechanical strength needed to maintain feature integrity under compression, while still using a cost-effective mechanical deformation process rather than expensive hydroentangling or hydromolding equipment.
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 provides nonwoven materials with enhanced softness, dryness, and liquid acquisition properties, maintaining the visibility and functionality of three-dimensional features even under compressive forces, while being compatible with high-speed manufacturing and cost-effective production.
Implementation Method 1
mechanically deforming the precursor nonwoven web with the forming members
Implementation Method 2
the presence of thermal point bonds at various locations in and around the protrusions
Data Source
Figure 1~3
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Figure 6~7
AI summary
Nonwoven materials having a first region and a plurality of discrete integral second regions that are in the form of three-dimensional deformations forming protrusions that extend outward from the first surface of the nonwoven material and wide base openings adjacent to the second surface of the nonwoven material are disclosed. The nonwoven materials include at least two layers that are each formed of a plurality of fibers. The first region has a first light transmission value and the second regions have a second light transmission value.