Hair Compression Measurement Device for Curly Hair Analysis
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Solution Overview
Problem
Current methods for measuring hair compression and softness are inadequate for curly hair, particularly African hair, as they lack sensitivity, objectivity, and universality, and existing tools are not suitable for evaluating hair with high curliness or providing quantitative data for cosmetic product assessment.
Innovation Solution
A device with a movable piston and thread member for controlled compression of hair swatches, capable of precise force measurement and data recording, which communicates with external devices for processing and analysis, allowing for objective and quantitative evaluation of hair texture and softness across various curl types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing measurement methods (Aqualon test, 3 points bending) are used, then measurement can be performed on straight hair (curl type I-IV), but these methods are not suitable for curly hair (curl type V-VIII) and lack sensitivity for frizzy hair
Solution Approach 1:
The invention changes the measurement parameters by adapting the compression force range, compression distance, and measurement methodology to suit the specific mechanical properties of frizzy and curly hair (types V-VIII), making the measurement sensitive and accurate for these hair types while maintaining applicability across all curl types
Solution Approach 2:
The measurement device and method are designed to be universal, capable of measuring all hair curl types from I to VIII using the same basic apparatus, with the ability to adjust parameters to optimize for different hair types, particularly frizzy hair
2Ease of operation
If manual evaluation by pressing and scrunching hair between thumb and forefinger is used, then softness can be qualitatively assessed, but the measurement lacks accuracy and objectivity
Solution Approach 1:
The invention replaces the manual mechanical evaluation (thumb and forefinger pressing) with an automated mechanical measurement system that applies controlled compression force and records objective data, eliminating subjectivity while maintaining ease of operation through automated protocols
Solution Approach 2:
The measurement system incorporates feedback mechanisms that record the force-distance curve during compression, providing objective quantitative data that reflects the qualitative manual evaluation but with precise measurement and analysis capabilities
3Reliability
If specific instrumentation suitable for Caucasian hair is used, then measurements can be performed on straight to wavy hair, but the same instrumentation is not suitable for African hair with high curliness
Solution Approach 1:
The measurement system is designed with dynamic capabilities that allow adjustment of measurement parameters (force, distance, speed) to accommodate the varying mechanical properties of different hair types, making it reliable for Caucasian hair while also adaptable for African hair and all intermediate curl types
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
Enables precise, objective measurement of hair compression and softness, facilitating the evaluation of cosmetic product performance and communication of hair quality, suitable for all hair types from type I to type VIII, with ease of use and minimal equipment requirements.
Implementation Method 1
a system for driving in translation the piston into the body at a controlled speed and over a controlled distance of the piston, from a first position in which the swatch of hair is in a rest state to a second position in which the swatch of hair is in a crushing state
Implementation Method 2
a system for recording the piston force needed to crush the swatch up to the crushing state
Data Source
Figure 1~6
Figure 3~5
AI summary
The invention relates to a device for measuring hair compression and softness having a longitudinal axis (X) comprising: a body (1) to encase a swatch (5) of hair and a piston (2) movable in the body, a thread member arranged to thread the swatch into the body, a system for driving in translation the piston (2) into the body, a system for recording the piston (2) force needed to crush the swatch (5).