PDMS Skin Pore Mimic for Controlled Makeup Film Sustainability Testing
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Solution Overview
Problem
Existing methods for evaluating the sustainability of makeup compositions struggle to consistently control the application of sebum, leading to subjective analysis due to variable sebum application, which affects the evaluation of makeup breakdown and sustainability.
Innovation Solution
A skin pore mimic using a PDMS layer with a contact angle of 90° to 110° and holes simulating human pores, allowing sebum to rise through capillary action, providing a controlled environment for evaluating makeup sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sebum is applied to artificial skin or porous material for makeup sustainability evaluation, then the evaluation can assess the influence of oily components on cosmetic film, but the amount of sebum applied cannot be controlled consistently, leading to subjective analysis
Solution Approach 1:
The patent employs a porous artificial skin model with controlled pore structure that allows sebum to pass through from the lower layer to the upper layer where cosmetic composition is applied. The porous material provides consistent sebum delivery through capillary action and controlled diffusion, eliminating the variability of manual sebum application while maintaining physiological relevance of sebum-makeup interaction
Solution Approach 2:
The patent introduces an intermediary artificial skin model that mediates between the sebum source and the cosmetic composition. This intermediary layer with specific pore characteristics controls the rate and amount of sebum reaching the makeup, providing consistent and reproducible evaluation conditions while simulating natural skin behavior
2Reliability
If sebum is randomly passed through porous material to evaluate makeup breakdown, then the evaluation can observe changes in cosmetic composition, but the random passage of sebum makes it difficult to achieve consistent and objective results
Solution Approach 1:
The patent prepares the artificial skin model with pre-defined pore structure and properties before the evaluation test. The pore size, distribution, and material characteristics are predetermined to ensure consistent sebum passage behavior. This preliminary preparation eliminates the need for random or manual sebum application during the test, ensuring reliable and reproducible results
Solution Approach 2:
The patent controls key parameters of the porous artificial skin including pore size, porosity, and material composition to optimize sebum passage characteristics. By carefully selecting and controlling these parameters, the system achieves consistent sebum delivery that simulates natural skin while maintaining evaluation reliability and objectivity
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 skin pore mimic objectively evaluates the sustainability of cosmetic compositions by simulating sebum secretion and external forces, enhancing the accuracy of makeup evaluation.
Implementation Method 1
allowing sebum to rise through capillary action
Data Source
AI summary
A skin pore mimic, and more specifically, the skin pore mimic, according to one aspect of the present disclosure, includes a PDMS layer that includes polydimethylsiloxane and has a contact angle with water ranging from 90° to 110°, in which the PDMS layer includes a plurality of holes that penetrate through an upper surface of the PDMS layer and a lower surface of the PDMS layer, thereby exhibiting characteristics similar to real skin in terms of hydrophilicity, elasticity, and the like, and enabling the simulation of sebum being secreted through pores. The skin pore mimic, according to one aspect of the disclosure, allows for an objective evaluation of the sustainability of a test material with respect to sebum.