Flattened Multilobar Polyester Nonwoven Fabric for Sanitary Napkins
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Solution Overview
Problem
Existing sanitary napkin surface materials face challenges in achieving high water absorbability, bulkiness, flexibility, and anti-see-through properties while maintaining a soft texture and adequate bristle falling properties, as previous solutions either compromise on water absorbency, strength, or visibility issues.
Innovation Solution
A nonwoven fabric with polyester-based fibers having a flattened multilobar cross-section, featuring 6 or more convex portions, specific flatness, irregularity, and convex ratio, combined with an olefin-based surface layer, which enhances water absorption, diffusing capacity, and flexibility while preventing liquid visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polyester fiber with flatness of 2.0 or less is used to achieve high water absorbability and bulkiness, then water absorbability and bulkiness are improved, but bristle falling properties deteriorate and texture becomes poor
Solution Approach 1:
The invention changes the flatness parameter from 2.0 or less to 2.05 or more, which resolves the contradiction by improving bristle falling properties and texture while maintaining high water absorbability and bulkiness through the optimized cross-sectional geometry with 6 or more lobes
2Volume of stationary object
If olefin-type composite fiber with multilobar cross section is used to achieve high bulkiness and texture, then bulkiness and texture are improved, but water absorbability and nonwoven fabric strength deteriorate
Solution Approach 1:
The invention uses a composite structure combining polyester fiber (70-95 wt%) with high water absorbability and olefin fiber (5-30 wt%) with high bulkiness, creating a nonwoven fabric that achieves both high water absorbability and high bulkiness simultaneously while maintaining adequate strength
Solution Approach 2:
The invention applies different fiber types in specific proportions within the nonwoven fabric, with polyester providing water absorbability in the bulk and olefin providing bulkiness at the surface, achieving localized optimization of different properties
3Ease of operation
If material with irregular cross-sectional shape is used to achieve flexibility, then flexibility is improved, but anti-see-through property and water absorbability deteriorate
Solution Approach 1:
The invention optimizes the lobe number to 6 or more, which provides sufficient flexibility while maintaining high water absorbability and achieving good anti-see-through property through the specific geometric configuration that balances these competing requirements
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 a sanitary napkin surface with high water absorbability, diffusing capacity, flexibility, and anti-see-through properties, ensuring a soft texture and effective liquid management, addressing the limitations of previous materials.
Implementation Method 1
a water absorption sheet for sanitary napkins comprising a nonwoven fabric for sanitary materials that is high in water absorbability, high in liquid holding capacity for water, chemicals, etc.
Implementation Method 2
the surface of the nonwoven fabric for sanitary materials being covered with olefin based nonwoven fabric
Data Source
Figure 1
AI summary
[Problem] The present invention aims to provide nonwoven fabric for sanitary materials having high water absorbability and high diffusing capacity for liquids such as water and chemicals as well as high bulkiness, flexibility, and anti-see-through property, and also provides sanitary material products produced therefrom including a water absorbing sheet for sanitary napkins. [Means of solution] The nonwoven fabric for sanitary materials according to the present invention is nonwoven fabric of polyester based fiber with a flattened multilobar cross section containing 6 or more convex portions along the cross-sectional circumference, the polyester based fiber with a flattened multilobar cross section having a flatness of 2.0 to 3.0, a degree of irregularity of 1.0 to 5.0, and a convex ratio of 0.6 to 0.9, and the polyester based fiber with a flattened multilobar cross section being joined by heat-weldable fiber.