Absorbent Article Paper Packaging with Controlled Seal Peeling
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Solution Overview
Problem
Paper packaging sheets for absorbent articles are prone to tearing and generate rustling sounds, which are undesirable for user experience.
Innovation Solution
A paper packaging sheet design with a tensile strength of 15 N/25 mm or less in the longitudinal direction, where the seal strength (Ss) is less than the tensile strength (Sw) of the packaging sheet, ensuring resistance to tearing and minimizing noise during opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a strong packaging sheet with weight and/or large thickness is used to prevent tearing, then tearing resistance is improved, but rustling sound is generated when carried or opened
Solution Approach 1:
The patent changes the key parameter of tensile strength to 15 N/25 mm or less, which is lower than conventional strong packaging sheets. This parameter change reduces the rustling sound while the specific seal strength relationship (Ss < Sw) maintains adequate tearing resistance during opening
Solution Approach 2:
The patent uses a composite structure combining paper packaging sheet with seal parts having different material properties. The seal parts are designed with specific peeling strength characteristics that differ from the base paper material, creating a composite system that balances softness and tear resistance
2Object-generated harmful factors
If paper packaging sheet is used for sustainable development, then environmental friendliness is improved, but tearing resistance deteriorates
Solution Approach 1:
The patent applies local quality by creating different strength characteristics in different regions of the packaging structure. The seal parts have specifically engineered peeling strength that is less than the tensile strength of the paper sheet, providing localized reinforcement where sealing occurs while maintaining overall paper softness and tear resistance
Solution Approach 2:
The patent introduces dynamic behavior through the seal parts that are designed to peel off at controlled strengths. The seal strength being less than tensile strength creates a dynamic opening process where seals fail before the paper sheet itself, providing adequate protection during use while allowing easy opening
Data Source
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AI summary
An individually packaged absorbent article, for which an absorbent article is individually packaged by a packaging sheet made of paper, wherein the packaging sheet is inwardly folded in a longitudinal direction with the absorbent article disposed inside the packaging sheet, and both edge portions in a transverse direction orthogonal to the longitudinal direction are sealed and form a seal part, the packaging sheet has tensile strength in the longitudinal direction that is 15 N/25 mm or less, and when peeling strength in the seal part between different portions of the packaging sheet is referred to as Ss and the tensile strength of the packaging sheet is referred to as Sw, Ss < Sw is satisfied.