Sanitary Napkin Compression Zone Design for Embossing Defect Prevention
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Solution Overview
Problem
Existing absorbent articles face issues with defective formation of high compression portions and tearing of the top sheet due to uneven tension distribution and pressure application during manufacturing, leading to poor appearance and functionality.
Innovation Solution
The absorbent article features a low compression portion and a high compression portion on its bottom surface, with regularly-arranged high compression portions, a large-area high compression portion, and an auxiliary high compression portion arranged to surround the large-area portion, which helps in distributing pressure evenly and preventing defects during embossing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tension suppressing portions are provided around projecting portions on the embossing roll surface, then tension applied to the top sheet is reduced and compressed grooves are less likely to be defectively formed, but traces of pressing are left on the surface of the absorbent article causing decreased fit and appearance
Solution Approach 1:
The embossing roll surface is segmented into distinct functional zones: projecting portions for compression, tension suppressing portions for tension control, and low pressure portions for surface protection. This segmentation allows each zone to perform its specific function without interfering with others, preventing both defective groove formation and surface traces
Solution Approach 2:
Different regions of the embossing roll surface are given different properties: the projecting portions have high compression capability, the tension suppressing portions have tension control capability, and the low pressure portions have surface protection capability. This local differentiation resolves the contradiction by ensuring that pressing traces are avoided in regions where appearance matters while maintaining compression effectiveness in regions where it matters
2Manufacturing precision
If tension suppressing portions are provided around projecting portions, then tension applied to the top sheet is reduced, but no countermeasure is taken in regions other than front and back sides causing the top sheet to stretch and tear readily
Solution Approach 1:
The embossing roll surface is divided into multiple functional segments including tension suppressing portions positioned strategically to cover front and back sides of compressed grooves, ensuring comprehensive tension control across the entire top sheet area during compression
Solution Approach 2:
The tension suppressing portions are designed to act preemptively by reducing tension on the top sheet before compression forces are fully applied, preventing stretching and tearing that would occur during the compression process
3Manufacturing precision
If large-area high compression portions are formed with relatively larger area, then pressure is applied over a wide range improving compression effectiveness, but high compression pattern is unsuccessfully formed and appearance deteriorates
Solution Approach 1:
The compressed groove structure incorporates low compression portions and high compression portions in specific spatial arrangements. The high compression portions are concentrated in regions where compression effectiveness is needed, while low compression portions are positioned in regions where appearance is prioritized, resolving the contradiction between compression effectiveness and appearance
4Manufacturing precision
If large-area high compression portions are formed with relatively larger area, then compression is improved, but large pressure applied in part causes the top sheet to be torn
Solution Approach 1:
The compression force is segmented and distributed through multiple high compression portions arranged in specific patterns, preventing concentration of large pressure in any single location. This distribution maintains compression effectiveness while preventing top sheet tearing
Solution Approach 2:
The tension suppressing portions act in advance to reduce tension on the top sheet before compression is applied, preparing the top sheet to withstand the compression forces without tearing
Data Source
AI summary
(Object) To prevent a high compression portion from being defectively formed and also a top sheet from being torn. (Means of Achieving the Object) A sanitary napkin (1) in which a low compression portion (15) and a high compression portion (16, 17, 18) are formed on a bottom surface of a compressed groove (10) that is recessed from a skin contact surface side. The high compression portion includes regularly-arranged high compression portions (16) that are regularly arranged in a longitudinal direction of the compressed groove (10), a large-area high compression portion (17) that is irregularly arranged in the compressed groove (10) and has an area larger than an area of each of the regularly-arranged high compression portions (16), and an auxiliary high compression portion (18) that is arranged at one side, in a longitudinal direction of the napkin, of the large-area high compression portion (17) through the low compression portion (15) so as to surround the one side, in the longitudinal direction of the napkin, of the large-area high compression portion (17).