Cosmetic Brush Teeth Grain Section for Eyelash Separation
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Solution Overview
Problem
Conventional plastic brushes for cosmetic use often cause an unpleasant scraping sensation when applied to eyelashes or hair, and struggle with effective engagement and separation, leading to inefficient application and consumption of cosmetic products.
Innovation Solution
A plastic brush with a central cylindrical core and equidistant teeth having a grain-shaped section and radiussed dome, designed for optimal engagement with eyelashes, featuring two edge lines at the major axis ends and a bidirectional slant for universal usability, allowing precise insertion and deposition of cosmetic products in a single pass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional plastic material is used for brush teeth, then the brush structure is simple and easy to manufacture, but the user experiences unpleasant scraping sensation and poor engagement with eyelashes
Solution Approach 1:
The patent applies local quality by modifying only the surface geometry of the teeth while keeping the base material as conventional plastic. The teeth are given a grain-shaped cross-section with two edge lines at the extreme points of the major axis, creating localized structural features that reduce scraping sensation without changing the overall material composition or manufacturing process
Solution Approach 2:
The patent implements curvature principles by designing the teeth with a grain-shaped cross-section and radiussed edges. The two edge lines at the extreme points of the major axis create rounded, curved surfaces that gently engage with eyelashes, eliminating the harsh scraping effect of conventional flat or sharp-edged teeth while maintaining ease of injection molding
2Ease of manufacture
If conventional brush teeth design is used, then manufacturing is simple, but engagement with eyelashes is difficult and separation capacity is poor
Solution Approach 1:
The invention applies local quality by concentrating the functional improvement in the teeth's cross-sectional geometry. The grain-shaped section with two edge lines at the major axis extremes creates localized engagement points that reliably separate eyelashes, while the rest of the brush structure remains simple and easy to manufacture using conventional injection molding
Solution Approach 2:
The curved, grain-shaped cross-section of the teeth with radiussed edges provides smooth contact surfaces that reliably engage and separate eyelashes. This curved geometry allows the teeth to gently lift and separate lashes without catching or tearing, improving reliability while maintaining manufacturing simplicity
3Productivity
If conventional brush design is used, then application process is standard, but application time is longer and product distribution is less efficient
Solution Approach 1:
The patent applies segmentation by dividing the brush surface into multiple series of equidistant teeth arranged in an optimized pattern. This segmented structure allows simultaneous engagement with multiple eyelashes across the brush width, enabling faster application and better product distribution in a single pass, thereby reducing application time and improving productivity
Data Source
AI summary
Brush for cosmetic products made of plastic material of the type apt to engage with an applicator rod including a central core having a substantially cylindrical shape carrying at the end a dome-shaped radiussed appendix and of the combination of various series of teeth mutually equidistant in a longitudinal direction, characterised in that the teeth have a grain-shaped section, which furthermore has two opposite edge lines in correspondence of the extreme points of the major axis.