Stretchable Material With Discrete Slits For Permeability
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Solution Overview
Problem
Conventional stretch materials used in clothing products, such as diapers, face challenges in achieving high permeability and a pleasant feel while minimizing roughness and waste generation, and ensuring durability and aesthetically pleasing appearance.
Innovation Solution
A stretch material with discretely formed arc-shaped slits that penetrate through a core and skin layer, enhancing permeability and reducing the formation of minute projections and recesses, which are formed using a manufacturing method that cuts the material to create slits rather than using perforations, thereby suppressing waste generation and adhesive passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If perforations are formed using heated needles, then permeability is enhanced, but minute projections and recesses are generated causing roughness
Solution Approach 1:
The invention changes the formation method parameter from thermal puncture (heated needles) to mechanical cutting. This parameter change allows permeability to be enhanced through slit formation while avoiding the thermal effects that create minute projections and recesses, thereby resolving the contradiction between permeability and surface smoothness.
2Object-affected harmful factors
If perforations are opened by die cutting, then projections and recesses are reduced, but waste is generated
Solution Approach 1:
The invention creates a porous structure through slits that are discretely formed by cutting. This approach achieves the desired permeability and surface quality while the slits are configured to minimize material waste compared to traditional die cutting methods that remove entire circular perforations.
3Quantity of substance
If perforations are formed, then permeability is enhanced, but adhesive passage through the material occurs
Solution Approach 1:
The invention applies local quality by creating slits with specific characteristics (discrete formation, particular dimensions, and configurations) rather than uniform perforations. The slits are designed to provide localized permeability enhancement while their specific geometry prevents adhesive from passing through, thus resolving the contradiction between permeability and adhesive containment.
4Object-affected harmful factors
If slits are formed to enhance permeability, then roughness is reduced, but the material structure becomes more complex
Solution Approach 1:
The invention segments the material structure by forming multiple discrete slits rather than using a continuous or uniform perforation pattern. This segmentation approach enhances permeability and reduces roughness while the modular nature of discrete slits actually simplifies the overall material structure compared to more complex alternative designs.
Data Source
AI summary
A stretch material according to one embodiment is a stretch material 10 including an elastomer and having multiple discretely formed slits 15. A stretchable member includes: a stretch part having a structure in which the skin layer of the stretch material 10 is plastically deformed; and a shape retaining part by which the layer structure of the stretch material 10 is maintained. A diaper, which is one example of a clothing product, includes the stretch material 10 or the abovementioned stretchable member.