Underpants Diaper Barrier Sheet Design for Inlet Opening
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Solution Overview
Problem
The underpants-type disposable diaper faces a challenge where the inlet of the dorsal side barrier tends to be narrowed due to the high fitting caused by the elastic member, making it difficult to open wider.
Innovation Solution
The solution involves designing an underpants-type disposable diaper with a barrier sheet that extends from the front side of the back end of the absorber to the back side, outward in the width direction from the side edges of the absorber. This barrier sheet has a free part not bonded to the back surface and a fixed part bonded to it, forming a pocket-shaped dorsal side barrier with an inlet opening to the crotch side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic member is provided in the lower torso region to provide elasticity in the width direction, then high fitting is achieved and back leakage prevention is improved, but the inlet of the dorsal side barrier is likely to be narrowed
Solution Approach 1:
The barrier sheet is divided into a fixed part (bonded to the back surface) and a free part (not bonded), creating a segmented structure that allows the free part to form an expandable inlet while the fixed part maintains attachment stability
Solution Approach 2:
The torsion hardness of the absorber is specifically controlled within the range of 0.18 to 0.32 N·cm/cm, optimizing the balance between maintaining inlet openness and preventing back leakage
Data Source
AI summary
An underpants-type disposable diaper in which an inlet of a dorsal side barrier is easily opened wider. The above problem is solved by an underpants-type disposable diaper in which a barrier sheet extends to a back side of a position on a front side of a back end of an absorber from the position and extends outward in a width direction from positions of both side edges of the absorber in the width direction is included, the barrier sheet has a free part not bonded to a member on a back surface side and a fixed part bonded to the member on the back surface side, a pocket-shaped dorsal side barrier having an inlet opening to a crotch side is formed by the free part of the barrier sheet, and a torsion hardness of a predetermined part including a back end portion of the absorber is 0.18 to 0.32 N·cm/cm.