Cleansing Sheet Preservative System for Sensitive Skin
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Solution Overview
Problem
Conventional cleansing sheets with high water content allow bacterial growth and can irritate delicate skin, especially when used on infants or elderly people, due to the need for reduced bactericidal preservatives and the potential skin issues caused by moisturizers.
Innovation Solution
A cleansing sheet composed of a nonwoven sheet impregnated with a cleaning agent containing 99.80 wt % to less than 99.95 wt % purified water and 0.05 wt % to 0.20 wt % bactericidal preservative, with benzalkonium chloride, iodopropynyl butylcarbamate, and propylene glycol or 1,3-butylene glycol, which effectively prevents bacterial and fungal growth while minimizing skin irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water content in cleaning agent is increased to reduce preservative content, then skin irritation is reduced, but bacterial growth is promoted
Solution Approach 1:
The patent changes the chemical composition parameters of the cleaning agent by replacing traditional preservatives (phenoxyethanol, methylisothiazolinone) with alternative substances (ethylhexylglycerin, caprylyl glycol) and adjusting their concentrations. This allows maintaining high water content (96-99.5 wt%) for reduced skin irritation while achieving effective bacterial growth prevention through the new preservative system.
Solution Approach 2:
The patent introduces ethylhexylglycerin and caprylyl glycol as intermediary substances that mediate between the conflicting requirements of high water content and bacterial prevention. These substances act as alternative preservatives that are effective at lower concentrations and are gentler on skin, bridging the gap between the two opposing needs.
2Ease of operation
If moisturizers are added to improve skin feel, then wiping comfort is enhanced, but skin problems may occur in infants and elderly people
Solution Approach 1:
The patent adjusts the concentration parameters of moisturizing agents (alcohol 5-20 wt%, aqueous moisturizer 1-10 wt%) to optimize the balance between wiping comfort and skin safety. By controlling these parameters within specific ranges, the patent achieves sufficient moisturizing effect for comfort while minimizing potential skin problems for sensitive groups.
Solution Approach 2:
The patent applies different moisturizing components strategically - using alcohol for immediate wiping comfort and aqueous moisturizers for sustained hydration. This localized application of different moisturizing mechanisms ensures comfort for average users while the controlled concentrations prevent excessive irritation for infants and elderly people.
3Object-affected harmful factors
If bactericidal preservative content is reduced to minimize skin irritation, then skin safety is improved, but bacterial growth prevention becomes insufficient
Solution Approach 1:
The patent creates a composite preservative system combining ethylhexylglycerin (0.5-5 wt%) and caprylyl glycol (0.5-5 wt%) with traditional preservatives at reduced concentrations. This composite approach leverages the synergistic effects of multiple substances to achieve effective bacterial growth prevention while maintaining lower overall preservative content for reduced skin irritation.
Solution Approach 2:
The patent introduces ethylhexylglycerin and caprylyl glycol as intermediary preservative substances that are less irritating to skin but effective at preventing bacterial growth. These intermediaries replace or supplement traditional harsh preservatives, allowing the formulation to maintain reliability in bacterial prevention with improved skin safety.
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 cleansing sheet provides reliable antibacterial and antifungal protection with a minimized bactericidal preservative content, suitable for delicate skin, and can be stored for a long period without contamination, reducing the risk of skin problems and bacterial growth.
Implementation Method 1
the bactericidal preservative comprising more than 0.025 wt % to 0.10 wt % benzalkonium chloride, more than 0.0025 wt % to 0.01 wt % iodopropynyl butylcarbamate
Implementation Method 2
a nonwoven sheet impregnated with a cleaning agent
Implementation Method 3
a nonwoven sheet impregnated with a cleaning agent
Data Source
AI summary
A cleansing sheet including a nonwoven sheet impregnated with a cleaning agent, the cleaning agent containing 99.80 wt % to less than 99.95 wt % of purified water and more than 0.05 wt % to 0.20 wt % of a bactericidal preservative, the bactericidal preservative including more than 0.025 wt % to 0.10 wt % benzalkonium chloride, more than 0.0025 wt % to 0.01 wt % iodopropynyl butylcarbamate, and more than 0.0225 wt % to 0.09 wt % glycol, based on the total weight of the cleaning agent taken as 100 wt %. The cleaning sheet can be applied to the delicate skin of infants or the sensitive skin of elderly people.