Two-Layer Diaper Top Sheet for Rash and Dryness Reduction
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Solution Overview
Problem
Disposable diapers often cause skin irritation and rash due to friction, hardness, and skin dryness, particularly in infants, despite the use of hydrophilic lotions to reduce these issues.
Innovation Solution
A disposable wearing article with a top sheet having a two-layer nonwoven fabric structure, a skin contact region treated with a nonionic surfactant containing an amide group, and a glycerin application to enhance moisture retention and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a hydrophilic lotion is applied to the top sheet to reduce friction, then friction is reduced, but skin dryness and rash still occur
Solution Approach 1:
The patent changes the chemical composition parameters of the lotion by specifying a nonionic surfactant with an amide group and glycerin content of 5-50 mass%, transforming the lotion from a simple hydrophilic solution to a specifically formulated composition that addresses both friction and skin dryness simultaneously
Solution Approach 2:
The patent creates a composite treatment by combining the nonionic surfactant with amide group and glycerin in specific proportions, forming a composite lotion that provides both lubrication and moisture retention functions, thereby resolving the contradiction between friction reduction and skin dryness prevention
2Ease of operation
If the top sheet is made thinner to improve comfort, then wearer comfort is improved, but structural integrity and absorption performance deteriorate
Solution Approach 1:
The patent applies local quality by treating only the skin contact region with the specific lotion composition, while maintaining different fiber fineness in upper and lower layers of the top sheet, thereby providing enhanced comfort at the skin interface without compromising the overall structural integrity and absorption performance of the diaper
3Object-affected harmful factors
If a nonionic surfactant with amide group and glycerin are applied to the skin contact region, then rash prevention is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-formulating the lotion with specific ratios of nonionic surfactant with amide group and glycerin (5-50 mass% glycerin content) before application to the top sheet, and by designing a two-layer nonwoven fabric structure in advance, thereby simplifying the manufacturing process while achieving effective rash prevention
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
The solution provides excellent rash prevention by reducing physical irritation and maintaining skin moisture, thereby improving wearer comfort.
Implementation Method 1
a body fluid pervious treatment agent containing a nonionic surfactant having an amide group is applied
Implementation Method 2
apply a hydrophilic lotion to a top sheet formed of a nonwoven fabric in order to reduce friction and the like
Implementation Method 3
a glycerin-containing region to which glycerin is applied
Data Source
AI summary
A disposable wearing article having an excellent rash preventing effect. The above problem is solved by a disposable wearing article including a top sheet having a skin contact region in contact with a skin of a wearer, wherein the skin contact region has, in a region to which a body fluid pervious treatment agent containing a nonionic surfactant having an amide group is applied, a glycerin-containing region to which glycerin is applied, and the top sheet has a two-layer structure of an upper layer of less than 2.0 dtex and a lower layer of 2.0 to 4.0 dtex, and is formed of a nonwoven fabric having a basis weight of 5 to 40 g/m2.