Absorbent article
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Solution Overview
Problem
Absorbent articles face challenges in simultaneously reducing residual liquid and sticky feelings on the skin, with existing liquid film cleavage agents often causing excessive stickiness when in contact with the skin in large amounts.
Innovation Solution
The absorbent article incorporates a topsheet with a liquid film cleavage agent, specifically compounds C1 and C2, arranged in a thickness intermediate position or on the absorbent body side, which have a spreading coefficient of 15 mN/m or more and low water solubility, and an interfacial tension of 20 mN/m or less, to effectively cleave liquid films and reduce residual liquid while minimizing skin contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a liquid film cleavage agent is applied to the skin-contact surface of the topsheet, then residual liquid is reduced, but sticky feeling on the skin increases
Solution Approach 1:
The patent applies liquid film cleavage agents to specific locations within the topsheet structure (thickness intermediate position or absorbent body side) rather than uniformly across the skin-contact surface. This localized application ensures the agents are positioned where they can effectively cleave liquid films and drain residual liquid without coming into direct contact with the skin, thereby eliminating the sticky feeling while maintaining liquid reduction effectiveness.
2Productivity
If compounds with high spreading coefficient are used, then liquid film cleavage efficiency is improved, but water solubility increases causing skin irritation
Solution Approach 1:
The patent specifies precise parameter ranges for the liquid film cleavage agents: spreading coefficient of 15 mN/m or more (for effective liquid film cleavage) and water solubility of 0 g or more and 0.025 g or less (to prevent skin irritation). By carefully controlling these chemical parameters, the invention achieves effective liquid film cleavage while maintaining low water solubility to avoid excessive skin contact and irritation.
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
This configuration achieves a balance by reducing residual liquid and preventing sticky feelings on the skin, enhancing dryness and comfort by promoting efficient liquid drainage and minimizing the agent's contact with the skin.
Implementation Method 1
compound C1 having a spreading coefficient of 15 mN/m or more to a liquid having surface tension of 50 mN/m
Implementation Method 2
a liquid film formed in narrow interfibre spaces of the nonwoven fabric can be cleaved by a liquid film cleavage agent
Implementation Method 3
bonding the first fibre layer and the second fibre layer by thermal fusion by heat treatment at a temperature higher than or equal to a melting point of the thermally fusible fibres
Data Source
Figure 1~2
Figure 3~4
Figure 5~5(C)
AI summary
An absorbent article, containing a topsheet, a backsheet, and an absorbent body interposed between the topsheet and the backsheet, in which the topsheet has an arrangement portion of a liquid film cleavage agent in a thickness intermediate position.