Elastic Member Structure for Non-Monotonous Wrinkles and Ventilation
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Solution Overview
Problem
Existing elastic sheet structures in disposable wearing articles, such as diapers, exhibit monotonous contraction wrinkles that detract from their aesthetic appeal and can lead to insufficient ventilation paths.
Innovation Solution
An elastic member with a stretchable structure where an elastic sheet is interposed between two sheet layers, bonded through joint holes and sheet joined portions, with specific arrangements of these portions to limit continuous contraction wrinkles and enhance ventilation paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an elastic sheet is stretched and bonded between sheet layers with uniform intervals, then the structure is simple to manufacture, but the contraction wrinkles appear monotonous and reduce consumer appeal
Solution Approach 1:
The patent applies asymmetry by varying the intervals between sheet joined portions in different regions. Specifically, the interval in the stretchable direction is set to 3-15mm in one region and 18-30mm in another region, creating non-uniform spacing that generates complex, non-monotonous contraction wrinkles while remaining manufacturable
Solution Approach 2:
The patent implements local quality by differentiating the interval settings in different regions of the elastic sheet. The first region has intervals of 3-15mm while the second region has intervals of 18-30mm, allowing each region to contribute differently to the overall appearance complexity without compromising manufacturing simplicity
2Object-generated harmful factors
If sheet joined portions are arranged with large intervals, then air permeability is improved, but the structural stability and bonding strength are reduced
Solution Approach 1:
The patent applies local quality by setting different interval ranges for different regions: 3-15mm in the first region and 18-30mm in the second region. This allows the first region to provide stronger bonding with smaller intervals while the second region provides enhanced air permeability with larger intervals, achieving both goals simultaneously through spatial differentiation
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 elastic member provides a complex, non-monotonous appearance and ensures effective ventilation, improving consumer appeal and comfort by dispersing contraction wrinkles and maintaining adequate air permeability.
Implementation Method 1
In such an elastic sheet stretchable structure, in a natural length state, the elastic film contracts between the sheet joined portions, so that the intervals between the sheet joined portions decrease, and contraction wrinkles are formed
Data Source
AI summary
A member that exhibits a complicated appearance without monotonous contraction wrinkles and has excellent appeal to consumers when the member is applied to an absorbent article. A third joined portion row is formed between a first joined portion row A1 and a second joined portion row adjacent to each other, and an interval of at least a part of the third joined portion row in the alignment direction is longer than an interval S1 of the first joined portion row and the interval of the second joined portion row in the alignment direction.