Paper Wrapping Surface Design for Non-Slip Absorbent Article Stacks
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Solution Overview
Problem
Individually-wrapped absorbent articles using paper wrapping sheets with high smoothness for printing operability tend to slip when stacked, leading to reduced production efficiency and a cheap appearance impression.
Innovation Solution
The wrapping sheet has a mean deviation of coefficient of friction (MMD) of 0.050 or less before printing and a coefficient of static friction of 0.60 or greater after printing, with a blending ratio of recycled fibers at 20% or greater, and includes fiber bundles to prevent slipping and maintain a premium appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If paper having high surface smoothness is used as a wrapping sheet to enhance printing operability, then printing quality is improved, but the individually-wrapped absorbent articles are likely to slip against one another when stacked
Solution Approach 1:
The wrapping sheet is designed with non-uniform surface properties: the first surface (outer surface) maintains high smoothness for excellent printing quality, while the second surface (inner surface) and edge portions have higher roughness to increase friction and prevent slipping during stacking. This local differentiation of surface quality allows simultaneous achievement of both printing operability and stacking stability.
2Ease of manufacture
If paper having high surface smoothness is used as a wrapping sheet, then printing operability is improved, but the appearance and texture resemble copy paper giving a cheap impression
Solution Approach 1:
The wrapping sheet employs different surface characteristics for different functions: the first surface is highly smooth to enable excellent printing quality, while the second surface and edge portions have higher roughness to create a premium appearance and texture that does not resemble cheap copy paper. This local quality differentiation resolves the contradiction between printing operability and aesthetic appearance.
3Productivity
If the wrapping sheet has high friction to prevent slipping during stacking, then production efficiency is maintained, but printing operability is reduced
Solution Approach 1:
The wrapping sheet is designed with spatially differentiated friction characteristics: the first surface maintains low friction for excellent printing operability, while the second surface and edge portions have high friction to prevent slipping during stacking and maintain production efficiency. This local quality approach allows both printing quality and production efficiency to be achieved simultaneously.
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
Achieves both high printing operability and prevents slipping of stacked absorbent articles, maintaining a premium appearance and enhancing production efficiency.
Implementation Method 1
the exposed surface after the printing has a coefficient of static friction of 0.60 or greater against an exposed surface of another individually-wrapped absorbent article
Data Source
AI summary
An individually-wrapped absorbent article includes a wrapping sheet including paper, and an absorbent article individually wrapped with the wrapping sheet. Printing is provided on an exposed surface of the wrapping sheet, which is exposed when the wrapping sheet individually wraps the absorbent article. The exposed surface has MMD of 0.050 or less before printing, and the exposed surface after the printing has a coefficient of static friction of 0.60 or greater against an exposed surface of another individually-wrapped absorbent article.