Composite Laminate Body for Disposable Diapers with Interval Resin Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing composite laminate bodies for disposable diapers and similar applications face challenges in achieving a balance between appearance aesthetics, soft feel, and wide size adaptation range, with issues related to elongation dependency and visibility of elastic fibers.
Innovation Solution
A composite laminate body with elastic fibers arranged in parallel between two sheets of cloth, where resin strands intersect with elastic fibers, ensuring high precision application and separation between intersections, achieving low elongation dependency and a soft feel while maintaining uniformity and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hot melt adhesive is applied to substantially the entire region of elastic fiber and bonds to cloth on both sides, then bonding strength is improved, but return properties are impaired when stretching load is released
Solution Approach 1:
The continuous hot melt adhesive application is segmented into interval applications, where adhesive is applied only at specific intervals along the elastic fiber rather than continuously along its entire length. This segmentation reduces the restriction on elastic fiber movement while maintaining adequate bonding strength at the adhesive application points.
Solution Approach 2:
The bonding structure transitions from uniform continuous bonding to non-uniform interval bonding, creating local variations in bonding strength. The adhesive is applied locally at specific intervals rather than uniformly along the entire elastic fiber, allowing different regions to have different bonding characteristics that balance strength and elasticity.
2Reliability
If elastic fibers are used to enhance fit and prevent leaking, then functional performance is improved, but elastic fibers become noticeable and appearance aesthetics are impaired
Solution Approach 1:
The elastic fibers are dyed to match the color of the surrounding cloth material, making them visually indistinguishable from the cloth. This color matching allows the elastic fibers to perform their functional role while remaining aesthetically concealed in the final product.
Solution Approach 2:
The elastic fibers are made visually homogeneous with the cloth through color matching and interval application. The interval application pattern combined with color matching creates a homogeneous appearance where the elastic fibers blend into the cloth structure rather than standing out as distinct elements.
3Adaptability or versatility
If multiple sizes of products are established to accommodate different body sizes, then size adaptation range is improved, but manufacturing complexity and burden are increased
Solution Approach 1:
The diaper structure incorporates dynamic elastic fibers that can stretch and recover, allowing a single product size to dynamically adapt to different body sizes. The elastic fibers provide stretchability that enables the diaper to accommodate variations in waist and hip measurements without requiring multiple fixed sizes.
Solution Approach 2:
The use of elastic fibers changes the mechanical parameters of the diaper structure, transforming it from a rigid fixed-size structure to a flexible adaptive structure. The elastic properties allow the diaper to change its dimensions dynamically, effectively providing size adaptation within a single product design.
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 composite laminate body with regular, uniform folds, excellent fit, and a wide size adaptation range, while making the elastic fibers less noticeable, thus enhancing both functionality and appearance.
Implementation Method 1
thermal fusing fibers are provided to extend in a direction that intersects with the elastic stretchable members the elastic stretchable members are secured between the sheet-like cloths by thermally fusing the thermal fusing fibers
Implementation Method 2
the return properties are impaired when the stretching load is released
Implementation Method 3
the return stress upon release of an elongating load (hereinafter also referred to as unload power)
Data Source
AI summary
A composite laminate is provided with improved appearance aesthetics and functionality for use in disposable diaper and hygiene products, providing particularly low elongation dependency of unload power, and a soft feel. The composite laminate body has a plurality of elastic fibers arranged in parallel in one direction, interposed between two sheets of cloth; and resin bonding the elastic fibers and the two sheets of cloth, provided in a plurality of strands arranged to be parallel in one direction that intersects with the elastic fibers; wherein the two sheets of cloth and the elastic fibers are separated between locations where adjacent resin strands and elastic fibers intersect in the longitudinal direction of the elastic fibers.