Bag-on-Valve Cosmetic Spray Emulsion Stability
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Solution Overview
Problem
Conventional cosmetic sprays using oil-in-water emulsions face challenges in maintaining stability and sprayability, resulting in either premature phase separation or excessive scattering of droplets, leading to inefficient targeting and environmental contamination.
Innovation Solution
A cosmetic spray system comprising an oil-in-water emulsion with sodium stearoyl glutamate and a bag-on-valve applicator, which maintains positive pressure to ensure consistent droplet size and focused spray pattern, utilizing a specific configuration of the spray head and bag composition to minimize scattering losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the emulsion is made thin enough to be sprayable, then sprayability is improved, but stability deteriorates and phase separation occurs
Solution Approach 1:
The patent changes the rheological parameters of the emulsion by incorporating specific polymers (carboxymethyl cellulose, hydroxyethyl cellulose, or xanthan gum) at controlled concentrations (0.01-5% w/w). These parameter changes enable the emulsion to maintain both sprayability and stability by adjusting viscosity and flow characteristics without compromising phase stability.
Solution Approach 2:
The patent introduces intermediary substances (polymers and surfactants) that act as mediators between the water and oil phases. These intermediaries prevent phase separation while maintaining the emulsion's ability to be sprayed, effectively resolving the contradiction between thinness for sprayability and composition for stability.
2Manufacturing precision
If the spray mist droplets are made as small as possible for fine dispersion, then spray fineness is improved, but scattering losses increase and targeting precision deteriorates
Solution Approach 1:
The patent adjusts the rheological parameters of the emulsion through the addition of specific polymers and surfactants. This enables control over droplet size distribution and spray pattern, achieving fine dispersion while maintaining directional focus and reducing scattering losses through optimized viscosity and surface tension properties.
Solution Approach 2:
The patent replaces purely mechanical spray mechanisms with a chemically-influenced spray system where the emulsion's rheological properties (modified by polymers and surfactants) play a critical role in droplet formation and spray pattern. This substitution allows for better control over droplet size and directionality.
3Manufacturing precision
If the spray mist is focused for targeted application, then application precision is improved, but spray coverage area is reduced
Solution Approach 1:
The patent employs dynamic control of the spray pattern through rheologically-modified emulsion properties. The polymer and surfactant composition enables the spray to adapt its pattern based on flow conditions, achieving focused delivery to target areas while maintaining adequate coverage through controlled dispersion and directional focus.
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 achieves a well-focused, fine spray mist that adheres effectively to the skin with reduced scattering, enhancing application precision and minimizing environmental contamination.
Implementation Method 1
a bag containing the O/W emulsion is in a pressurized gas container under positive pressure
Implementation Method 2
an oil-in-water emulsion (O/W emulsion) comprising sodium stearoyl glutamate
Data Source
AI summary
The invention relates to a cosmetic spray consisting of a) an oil-in-water emulsion (O/W emulsion) containing sodium stearoyl glutamate and b) a spray applicator system.