Disposable Diaper Cover Sheet Length for Air Permeability
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Solution Overview
Problem
Disposable diapers suffer from reduced air-permeability due to elastically stretchable and contractible belt-like members that come into close contact with the wearer's waist, leading to stuffiness and potential diaper rash.
Innovation Solution
A disposable wearing article design featuring a crotch member with cover sheets on the garment-facing side, where the length of these cover sheets is shorter than the waist members, allowing for higher air-permeability regions and preventing direct contact with the wearer's skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer sheet is bonded to the entire surface of the belt-like members, then the absorbent structure is protected from curling and peeling, but air-permeability deteriorates causing stuffiness and diaper rash
Solution Approach 1:
The patent applies local quality by bonding the outer sheet to the belt-like members only in specific regions (side edges and front/rear ends) rather than the entire surface. This selective bonding provides necessary structural support and prevention of curling/peeling at critical areas while leaving other regions uncovered to maintain air-permeability and prevent stuffiness-induced diaper rash.
2Ease of operation
If the belt-like members are made elastically stretchable and contractible to fit the wearer's waist, then comfort and fit are improved, but air-permeability is reduced due to close contact with skin
Solution Approach 1:
The patent segments the bonding regions into specific zones (side edges and front/rear ends) rather than continuous bonding. This segmentation allows the elastic belt-like members to maintain close contact with the wearer's waist for comfort and fit while creating air-permeable pathways in the unbonded regions, thereby reducing stuffiness.
3Reliability
If the cover sheets are made the same size as the waist members, then complete coverage of the crotch member ends is achieved, but air-permeability of the waist members is reduced
Solution Approach 1:
The patent applies local quality by making the cover sheets smaller than the waist members, providing coverage only at the critical front and rear ends of the crotch member. This selective coverage protects the ends where they are most needed while leaving portions of the waist members exposed to maintain air-permeability and prevent stuffiness.
Data Source
AI summary
A diaper includes front and rear waist members and a crotch member. The front and rear waist members are respectively formed with first narrowly-spaced elastic zones, widely-spaced elastic zones and second narrowly-spaced elastic zones adjacent one to another. Front and rear ends of the crotch member are bonded to respective sides of the front and rear waist members so that the crotch member's front and rear ends may positionally correspond to the second narrowly-spaced elastic zones. Cover sheets are attached to the side of the crotch member to cover the crotch member's front and rear ends respectively. A length dimension of the cover sheet in the longitudinal direction is set to be smaller than those of the front and rear waist members and a length dimension of the cover sheet in the transverse direction is substantially equal to those of the front and rear waist members.