Absorbent Product Adhesive Layout to Prevent Twisting
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Solution Overview
Problem
Existing absorbent products face issues with adhesive twisting and difficulty in detachment due to high adhesion strength, especially when the adhesive portion overlaps the absorber, and do not consider the impact of layer thickness differences on adhesive behavior.
Innovation Solution
The absorbent product design includes a specific arrangement of adhesive elements on the back sheet, avoiding boundary portions between different thickness areas of the absorber, with varying intervals and orientations to minimize twisting and ensure easy detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive portion is provided to approximately overlap the entire absorber, then attachment strength to exterior product is improved, but the absorbent product becomes difficult to detach and may cause robust creases
Solution Approach 1:
The adhesive portion is divided into multiple adhesive elements (first adhesive elements in the first area, second adhesive elements in the second area) rather than using a single continuous adhesive layer. This segmentation allows different regions to have different attachment characteristics, providing strong attachment where needed while maintaining ease of detachment in other areas.
Solution Approach 2:
Different adhesive elements are strategically placed in different areas (first area vs. second area) with different properties. The first adhesive elements provide strong attachment in the central portion, while the second adhesive elements provide attachment at the ends, creating local variations in attachment strength that balance security with ease of removal.
2Area of stationary object
If strip adhesive portion extends spanning both edges of the absorber, then attachment coverage is improved, but twisting of the adhesive portion occurs
Solution Approach 1:
The continuous strip adhesive is segmented into multiple discrete adhesive elements distributed across the back sheet. This segmentation prevents the adhesive portion from twisting while maintaining broad coverage, as the individual elements can accommodate layer thickness variations without causing structural distortion.
Solution Approach 2:
The adhesive elements are asymmetrically arranged with different configurations in the first area versus the second area. This asymmetric distribution compensates for the uneven layer thickness caused by the two-layer absorber structure, preventing twisting of the adhesive portion while maintaining effective attachment coverage.
3Reliability
If adhesive portion is applied on the back sheet, then attachment to exterior product is achieved, but twisting occurs due to difference in level at boundary portions
Solution Approach 1:
The adhesive elements are selectively placed in specific areas (first area and second area) rather than uniformly across the entire back sheet. This local placement strategy accounts for the difference in level at boundary portions, ensuring reliable attachment in areas where the back sheet is flat while avoiding regions where twisting would occur.
Solution Approach 2:
The adhesive elements are pre-positioned on the back sheet during manufacturing to avoid boundary portions where level differences occur. This preliminary placement ensures that the adhesive is applied only in suitable areas, preventing twisting issues before the product is used.
Data Source
AI summary
An absorbent product includes an adhesive portion arranged on a surface of a back sheet opposite to a wearer side. Longitudinal-side boundary portions are between first and second areas of an absorber, the second area being thinner than the first area. The adhesive portion includes first adhesive elements and second adhesive elements arranged on the back sheet to avoid the longitudinal-side boundary portions. Each of the first adhesive elements extends in one of a longitudinal direction or a width direction in the first area, and the first adhesive elements are aligned in the other of the longitudinal direction or the width direction in the first area. Each of the second adhesive elements extends in one of a longitudinal direction or a width direction in the second area, and the second adhesive elements are aligned in the other of the longitudinal direction or the width direction in the second area.