Antiperspirant Spray Device Propellant Concentration Optimization
Solution Overview
Problem
Aerosol antiperspirant spray devices face challenges in providing a uniform dose due to settling and agglomeration of particulates, which affects skin feel and residue appearance, and high propellant concentrations lead to gassy clouds and reduced deposition efficiency, while also interacting negatively with clay materials and liquid fragrances.
Innovation Solution
A hand-held spray device with a propellant concentration between 30% to 70% by weight, containing a non-volatile silicone fluid, an organoclay material, and a liquid activation enhancer with specific Hansen Solubility Parameters, along with an optional liquid fragrance material, to enhance dispersion and reduce residue issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high propellant concentration is used, then spray device portability and propulsive force are improved, but gassy cloud formation increases and deposition efficiency decreases
Solution Approach 1:
The patent changes the propellant concentration parameter from conventional high levels (typically 70-90%) to a reduced range of 30-70%, specifically optimizing it to balance propulsive force with reduced gassy cloud formation. This parameter modification directly addresses the contradiction by lowering the harmful effects while maintaining adequate spray performance.
2Speed
If propellant concentration is increased, then spray propulsion is improved, but interaction with clay materials and liquid fragrances increases causing negative effects
Solution Approach 1:
The patent modifies the propellant concentration parameter to a reduced range (30-70%) to minimize harmful interactions with clay materials and liquid fragrance components. This parameter change prevents composition instability while preserving sufficient spray propulsion capability.
3Stability of the object's composition
If clay material is added as suspending agent, then particulate settling is reduced, but liquid fragrance interaction increases causing negative effects
Solution Approach 1:
The patent reduces propellant concentration to (30-70%) to minimize the interaction between propellant, clay materials, and liquid fragrances. This parameter modification reduces harmful effects while the clay material continues to provide necessary particulate suspension stability.
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 improved dispersion and uniform dosing of actives, minimizes interactions between liquid fragrance and clay, and decreases visible residue problems, while maintaining a dry skin feel and long-lasting odor protection.
Implementation Method 1
Aerosol spray devices that dispense an antiperspirant composition
Implementation Method 2
a liquid activation enhancer having a Hansen Solubility Parameter for Hydrogen Bonding, δh, between about 2 and about 6
Data Source
AI summary
A method of filling a hand held spray device is disclosed. The spray device includes a body having a reservoir. The method includes filling the reservoir with a first composition having a non-volatile silicone fluid, an antiperspirant active, an organoclay material, and at least one liquid activation enhancer having a Hansen Solubility Parameter for Hydrogen Bonding, δh between about 2 and about 6 and a light transmittance value greater than 90%. The method further includes filling the reservoir with a liquid fragrance material after the reservoir is filled with the first composition to form an antiperspirant composition, attaching a valve to the body; and filling the reservoir with a propellant, wherein the hand held spray device has a propellant concentration after filling from about 30% to about 90% by weight of the total fill of materials within the reservoir and the non-volatile silicone fluid has a concentration from about 30% to about 70% by weight of the antiperspirant composition.