Disposable Diaper Sweat-Absorbent Sheet Positioning via Hydrophobic Sealing Zones
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Solution Overview
Problem
Conventional disposable diapers with sweat-absorbent sheets tend to move with the wearer's skin, reducing their surface area and effectiveness due to bonding issues with water-repellent sheets, which can lead to impaired sweat absorption.
Innovation Solution
A disposable diaper design featuring hydrophobic sheets with specific sealing-free and sealing zones that maintain the sweat-absorbent sheet's surface area, preventing it from being covered or moved upward, and incorporating elastic members to form gathers that enhance sweat absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the sweat-absorbent sheet is bonded to the water-repellent sheet, then the sheet is fixed to the diaper structure, but the lower end of the water-repellent sheet may be folded upward and cover the sweat-absorbent sheet, reducing its effective surface area
Solution Approach 1:
The water-repellent sheet is divided into distinct functional zones: a sealing zone that bonds to the topsheet, a sealing-free zone that remains unbonded and extends downward, and the sweat-absorbent sheet bonded only to the sealing zone. This segmentation prevents the folding-up issue by creating a clear separation between bonded and unbonded regions, ensuring the sweat-absorbent sheet maintains its effective surface area.
2Ease of operation
If the sweat-absorbent sheet is made to contact the wearer's skin for sweat absorption, then sweat absorption function is achieved, but the sheet moves together with the skin in the vertical direction, reducing its surface area
Solution Approach 1:
The sealing-free zone acts as an intermediary element between the bonded sealing zone and the unbonded lower portion of the water-repellent sheet. This intermediate unbonded zone allows the sweat-absorbent sheet to move with the wearer's skin for effective sweat absorption while preventing excessive upward folding that would reduce surface area, as the sealing-free zone provides a buffer region.
3Stability of the object's composition
If the water-repellent sheet is bonded extensively to the topsheet for structural stability, then the diaper structure is stabilized, but the sweat-absorbent sheet may be folded upward when the bonding configuration allows it
Solution Approach 1:
Different regions of the water-repellent sheet are given different bonding properties: the sealing zone has bonding capability to stabilize the diaper structure, while the sealing-free zone has no bonding and allows the sweat-absorbent sheet to maintain its position and shape. This local differentiation of bonding quality prevents unwanted folding while maintaining overall structural stability.
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 design ensures the sweat-absorbent sheet maintains its functionality by preventing reduction in surface area and allowing effective sweat absorption, even when the hydrophobic sheet moves or is curled, thus maintaining the diaper's sweat-absorbing ability.
Implementation Method 1
hydrophobic sheets covering the front and rear waist regions
Implementation Method 2
sweat-absorbent sheet attached to a part of an inner surface of the hydrophobic sheet
Implementation Method 3
sweat-absorbent sheet is bonded to the hydrophobic sheet in a sealing zone
Data Source
AI summary
A disposable diaper includes so that a sweat-absorbent sheet attached to the inner side of the diaper can maintain its sweat absorbing function during use of the diaper. The inner side of front or rear waist region constituting the disposable diaper is covered with a hydrophobic sheet and the sweat-absorbent sheet is bonded to the inner surface of the hydrophobic sheet. The hydrophobic sheet has a first sealing-free zone extending, inclusive of a first lower edge, in a circumferential direction so as to be left free from the inner side of the diaper and a first sealing zone extending above the first sealing-free zone and bonded to the inner side of the diaper. The sweat-absorbent sheet has a second lower edge extending in the circumferential direction above the first lower edge of the hydrophobic sheet, a second sealing-free zone extending, inclusive of the second lower edge, in the circumferential direction so as to be left free from the hydrophobic sheet and a second sealing zone extending above the second sealing-free zone and bonded to the hydrophobic sheet. A lower end of the first sealing zone is provided so as to lie below a lower end of the second sealing zone.