Absorbent Article Hip-Holding Portion Wrinkle Prevention
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Solution Overview
Problem
Conventional absorbent articles, such as sanitary napkins and incontinence pads, often experience wrinkling in the hip-holding portion, leading to a gap between the article and the wearer's body, and the rear flaps do not flexibly conform to the buttocks' curvature, resulting in poor fit and potential leakage.
Innovation Solution
The absorbent article features a hip-holding portion with projections and recesses on its outer periphery, allowing independent deformation to match the buttocks' shape, combined with a slip preventive portion on the back sheet that straddles critical areas to prevent wrinkles and ensure secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hip flap portion includes a constricted portion with flap portions projecting outward, then the absorbent article can prevent body fluids from leaking from the back and rear sides, but the constricted portion tends to become wrinkled causing a gap between the hip flap portion and the wearer's body
Solution Approach 1:
The side region is divided into multiple functional zones: a first projection with largest width, a first recess located forward of the projection, and a second projection forward of the recess. This segmentation allows each zone to independently deform and conform to the buttocks shape without creating wrinkles that compromise fit.
Solution Approach 2:
The back sheet is provided with a slip preventive portion at a specific location (straddling a virtual line from the bottom point of the first recess) to provide localized anti-wrinkle functionality. This local quality enhancement prevents wrinkling at the critical constricted portion while maintaining the overall hip holding structure.
2Reliability
If the rear flaps are extended in width and length to prevent leakage, then body fluids can be contained, but the rear flaps are not flexibly deformed following the roundness of buttocks
Solution Approach 1:
The hip-holding portion is designed with dynamic characteristics through the combination of projections and recesses that allow the material to flex and deform naturally. The slip preventive portion is strategically positioned to maintain flexibility while preventing unwanted wrinkling, enabling the rear flaps to adapt to the roundness of buttocks.
3Reliability
If the pressure-sensitive adhesive layer is provided on the rear flaps, then the flaps can be secured to the body, but the relationship between the adhesive layer and wrinkles is not taken into account leading to poor fit
Solution Approach 1:
The slip preventive portion is provided in advance at the critical location before the adhesive layer is applied. This preliminary action ensures that the area prone to wrinkling is pre-protected, allowing the adhesive layer to secure the flaps without creating or exacerbating wrinkles that would compromise fit quality.
Data Source
AI summary
An absorbent article includes: a main body (8) including a liquid permeable top sheet (3), a liquid impermeable back sheet (2), and an absorbent body (4) interposed between the top sheet and the back sheet; and a hip-holding portion (H), wherein the main body has a shape having a predetermined length in a front-back direction and a predetermined width in a direction orthogonal to the front-back direction, and wherein the hip-holding portion includes a side region protruding from a side of a rear portion of the main body, the side region including a first projection (41) that includes a portion having a largest width from a center line in the front-back direction of the main body, a first recess (51) that is located adjacent to and forward of the first projection, and a second projection (52) that is located adjacent to and forward of the first recess, and wherein the back sheet in the side region has a slip preventive portion for securing the absorbent article, the slip preventive portion being disposed so as to straddle, in the front-back direction, a virtual line that is drawn in the width direction from a bottom point of the first recess.