Mascara Brush High Bristle Density Hard Plastic
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Solution Overview
Problem
Conventional cosmetic brushes produced by injection molding have limitations in achieving high bristle density due to the use of soft plastic materials, which affects their ability to apply cosmetic products evenly and separate or comb lashes or hair effectively, especially for fine or short lashes common in Asian or older women.
Innovation Solution
A cosmetic brush with a high bristle density of at least 6 bristles per square millimeter, using a harder plastic material with a Shore hardness D of more than 40, allowing for a larger number of bristles (up to 1500 or more) and a smaller diameter, which enhances application and combing properties while maintaining a comfortable feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If soft plastic materials with Shore hardness A of 60-95 are used for injection molding, then the bristles are soft and elastic providing pleasant application feeling, but the bristle density is limited to maximum 500-600 bristles
Solution Approach 1:
The patent changes the material parameter from soft plastic (Shore hardness A 60-95) to hard plastic (Shore hardness D >40), enabling higher bristle density while maintaining functional performance. This parameter change resolves the contradiction by allowing 6+ bristles/mm² density with the hard material.
2Stability of the object's composition
If soft plastic materials such as polyethylene and polypropylene are used, then the bristles are elastic and deformable, but the chemical compatibility with cosmetic products is often unsatisfactory
Solution Approach 1:
The patent changes the material type from soft plastics (polyethylene, polypropylene) to hard plastics with Shore hardness D >40, which provides both the required elasticity for brush function and improved chemical compatibility with cosmetic products.
3Ease of manufacture
If conventional injection molding with soft materials is used, then production is cost-effective, but high bristle density of at least 6 bristles per square millimeter cannot be achieved
Solution Approach 1:
The patent uses hard plastic material with Shore hardness D >40 in the injection molding process, which enables achievement of high bristle density (≥6 bristles/mm²) while maintaining cost-effective production through the same manufacturing method.
Data Source
AI summary
The cosmetic brush, which is in particular a mascara brush, includes a bristle portion with a base body and a plurality of bristles that stick out from the base body in a radial direction and serve for the application of a cosmetic product. The bristles have a high bristle density of at least 6 bristles per square millimeter and consist of a plastic material that has a Shore hardness D of more than 40.