Packaging Sheet Colorant Layer Distribution for Seal Integrity
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Solution Overview
Problem
Absorbent articles wrapped in a wrapping sheet often have reduced sealability due to the placement of a colorant layer between the outer and inner surfaces during the tri-folding process, making them less secure and potentially visible.
Innovation Solution
A wrapping sheet design where the colorant layer is primarily on the exposed regions, with an area ratio of 30% or less in the overlapping seal portions, ensuring high sealability and concealment of the absorbent article.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a colorant layer is formed on the outer surface side of the wrapping sheet to provide shielding function, then the absorbent article becomes concealed from outside, but the sealability is reduced and seal portion tends to open
Solution Approach 1:
The patent applies local quality by creating different colorant layer configurations in different regions of the wrapping sheet. The exposed region (non-overlapping area) has a colorant layer with area ratio greater than 30% for shielding, while the overlapping seal region has colorant layer area ratio of 30% or less to ensure sealability. This spatial differentiation of colorant density resolves the contradiction between concealment and sealing reliability.
2Ease of operation
If the wrapping sheet is tri-folded and sealed to enable portability, then the absorbent article can be carried conveniently, but the colorant layer placement reduces sealability
Solution Approach 1:
The patent differentiates the wrapping sheet into functional zones: the exposed region maintains high colorant coverage for concealment, while the overlapping seal region maintains low colorant coverage (≤30% area ratio) to ensure reliable sealing during tri-folding. This local differentiation allows the wrapping sheet to simultaneously achieve portability through effective sealing and concealment through colorant shielding.
Data Source
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AI summary
A wrapping sheet for an absorbent article which is configured to be wrapped around the absorbent article such that a first region including one end of the wrapping sheet in a lengthwise direction overlaps a second region including an opposite end of the wrapping sheet in the lengthwise direction, and which is provided with a seal portion at edges of the wrapping sheet in a widthwise direction that is openably sealed to enable wrapping of the absorbent article, wherein a colorant layer is formed on an exposed region exposed to an outside when the absorbent article is wrapped, such that the absorbent article is not easily visible from the outside, and wherein a portion of the seal portion between the first region and the second region does not have the colorant layer, or has the colorant layer at an area ratio of 30% or less.