Wavy Line Bonding for Composite Stretchable Member Pleats
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Solution Overview
Problem
Existing composite stretchable members for wearing articles, such as disposable diapers, have monotonous patterns when contracting, limiting design property improvements due to linearly formed pleats along heat fusion lines.
Innovation Solution
A composite stretchable member with two sheets and elastic members, where the sheets are bonded at wavy line-shaped sections that intersect the elastic members, creating pleats in a wavy line shape upon contraction, allowing for varied and improved design properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If linear heat fusion lines are used to bond sheets, then manufacturing simplicity is maintained, but design properties deteriorate due to monotonous pleat patterns
Solution Approach 1:
The patent applies curvature to the bonding lines by using wavy line-shaped heat fusion lines instead of straight lines. This creates convex and concave portions that form varied pleat patterns when the elastic members contract, directly resolving the contradiction between manufacturing simplicity and design variety.
2Shape
If wavy line-shaped bonding sections are used, then design properties improve through varied pleat patterns, but manufacturing complexity increases
Solution Approach 1:
The patent changes the geometric parameters of the bonding sections by introducing wavy line shapes with specific convex and concave portions. This parameter change allows the creation of varied pleat patterns while maintaining relatively simple manufacturing processes, as the wavy pattern can be integrated into existing heat fusion equipment.
3Stability of the object's composition
If convex portions of adjacent bonding sections overlap when contracted, then pleat pattern uniformity improves, but bonding section design complexity increases
Solution Approach 1:
The patent employs asymmetric design in the bonding sections where convex portions of adjacent bonding sections overlap when the elastic members are in a contracted state. This asymmetric configuration ensures uniform pleat patterns while maintaining manufacturing feasibility through careful design of the wavy line geometry.
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 wavy line pattern enhances the design properties of the composite stretchable member, enabling the creation of wearing articles with unique textures and improved flexibility, particularly in disposable diapers, by forming pleats that enhance both aesthetics and functionality.
Implementation Method 1
a plurality of elastic members extending along the specific direction and being stretchable in the specific direction between the sheets
Implementation Method 2
the sheets being bonded to each other at a plurality of first bonding sections, each of the first bonding sections continuously extending along an intersecting direction intersecting the specific direction
Data Source
AI summary
Provided are a composite stretchable member and wearing article capable of improving design properties at the time of contraction. A composite stretchable member stretchable in a specific direction includes two sheets facing each other, and a plurality of elastic members extending along the specific direction and being stretchable in the specific direction between the sheets. The sheets are bonded to each other at first bonding sections. Each first bonding section continuously extends along the intersecting direction intersecting the specific direction and intersects the elastic members. Each elastic member is bonded to each sheet at an intersection with the corresponding one of the first bonding sections. Each first bonding section has a wavy-line-shape extending in the intersecting direction with convex portions and concave portions that alternately appear continuously. Two adjacent first bonding sections are disposed with the convex portions or the concave portions that at least partially overlap each other.