Disposable Wearing Article with Zoned Elasticity for Waist Tightening
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Solution Overview
Problem
Existing disposable wearing articles face challenges in achieving a strong tightening force in the waist portion while maintaining adequate air permeability and flexibility, particularly when an elastic film extends over both the waist and adjacent portions, as simple structures with a single elastic film layer cannot effectively differentiate tightening forces and may compromise air permeability.
Innovation Solution
A disposable wearing article with a dual structure of elastic members, featuring an outer side stretchable region with a nonwoven fabric sandwiching an elastic film and an inner side stretchable region with an elastic member, joined in a stripe pattern, allowing for differential tightening forces and improved air permeability through ventilation passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single layer of elastic film is used to extend over both waist portion and adjacent portion, then the structure is simple and manufacturing is easy, but the tightening force cannot be differentiated between waist portion and adjacent portion
Solution Approach 1:
The waist portion is divided into an outer side portion and an inner side portion, with the outer side portion having a dual-layer elastic film structure and the inner side portion having a single-layer elastic film structure. This segmentation allows different tightening forces to be applied to different regions of the waist portion.
Solution Approach 2:
The outer side portion of the waist portion is designed with a dual-layer elastic film structure to provide stronger tightening force, while the inner side portion uses a single-layer structure for gentler tightening. This local quality differentiation ensures that the waist portion receives stronger tightening while the adjacent portions experience gentler tension.
2Force
If a dual structure of elastic members is adopted in the waist portion, then stronger tightening force is achieved, but air permeability may be compromised
Solution Approach 1:
The dual-layer elastic film structure is applied only to the outer side portion of the waist portion where strong tightening force is needed, while the inner side portion maintains a single-layer structure that allows better air permeability. This localized application resolves the contradiction between tightening force and air permeability.
Solution Approach 2:
The waist portion is segmented into regions with different elastic film structures: the outer side portion with dual-layer for strong tightening and the inner side portion with single-layer for air permeability. This segmentation allows both requirements to be satisfied in different locations.
3Stability of the object's composition
If the elastic film extends over both waist portion and adjacent portion, then consistent texture is achieved, but it becomes difficult to apply different tightening forces to different regions
Solution Approach 1:
The continuous elastic film is segmented into an outer side portion with dual-layer structure and an inner side portion with single-layer structure. This segmentation allows the elastic film to maintain visual consistency while providing different tightening forces to different regions through structural differentiation.
Solution Approach 2:
Different structural qualities are applied to different portions of the elastic film: the outer side portion uses a dual-layer structure for strong tightening while the inner side portion uses a single-layer structure for gentler tightening, allowing regional differentiation while maintaining overall continuity.
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 dual structure enables stronger tightening force in the waist portion compared to adjacent areas and enhances air permeability by creating continuous ventilation passages, addressing the limitations of single-layer elastic film structures.
Implementation Method 1
an outer side elastic film extending over the outer side portion of the waist portion and the waist adjacent portion, in which the first sheet layer and the second sheet layer are welded through joint holes penetrating the outer side elastic film at sheet joined portions arranged at intervals, and the outer side stretchable region contracts in the width direction by contraction of the outer side elastic film and is extensible in the width direction
Implementation Method 2
an inner side stretchable region including an inner side elastic member, and the inner side stretchable region contracts in the width direction by contraction of the inner side elastic member and is extensible in the width direction
Implementation Method 3
the first sheet layer and the second sheet layer are welded through joint holes penetrating the outer side elastic film at sheet joined portions arranged at intervals
Data Source
AI summary
A disposable wearing article includes: a waist portion having an outer side portion exposed on an external surface and an inner side portion overlapped with an inner side of the outer side portion; an adjacent portion adjacent to the waist portion; an outer side stretchable region extending over the outer side portion and the waist adjacent portion; and an inner side stretchable region provided in the inner side portion, wherein the outer side portion and the inner side portion are joined with each other in a stripe pattern formed by disposing, alternately and repeatedly in the width direction, inner/outer bonded portions continuous in a front-back direction and inner/outer non-bonded portions continuous in the front-back direction, and a natural length in the width direction of the outer side portion is 1.1 to 1.8 times a natural length in the width direction of the inner side portion.