Mascara Brush With Faceted Core For Eyelash Separation
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Solution Overview
Problem
Mascara brushes face challenges in achieving a balance between loading and separating eyelashes effectively without clumping, and existing designs often result in uneven composition distribution and flattening issues.
Innovation Solution
A brush design featuring a rectilinear core with bristles that have a varying cross-sectional shape along its length, including non-planar facets and longitudinal strips, allowing for progressive wiping and reducing the risk of excessive composition accumulation and flattening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If brushes have substantial differences of length between the bristles within a cross-section, then loading ability is improved, but excessive composition accumulation and flattening occur
Solution Approach 1:
The brush implements local quality by creating specific zones with different bristle characteristics. Facets are machined on the brush blank to create zones with longer bristles for loading composition and zones with shorter bristles for separating eyelashes. This localized differentiation allows the brush to perform multiple functions simultaneously without excessive accumulation or flattening.
Solution Approach 2:
The brush surface is segmented into distinct functional zones through machining facets on the brush blank. These facets divide the brush into multiple regions, each with controlled bristle length variations, enabling progressive wiping action and preventing both excessive loading and flattening in any single area.
2Quantity of substance
If brushes are designed with facets to distribute composition unevenly, then loading ability in certain zones is improved, but separating ability in other zones deteriorates
Solution Approach 1:
The brush design applies local quality by creating facets that generate zones with different bristle lengths. Zones with longer bristles retain more composition for loading, while zones with shorter bristles provide better separating capability. This localized functional differentiation resolves the contradiction between loading and separating abilities.
Solution Approach 2:
The facets create asymmetric bristle length distributions across the brush surface. This asymmetry ensures that not all zones carry equal composition, with some zones optimized for loading and others for separating, thereby balancing both functions simultaneously.
3Ease of manufacture
If the brush cross-section is uniform along the longitudinal axis, then manufacturing is simplified, but progressive wiping action is reduced
Solution Approach 1:
The brush implements dynamics by varying the cross-sectional shape along the longitudinal axis. The envelope surface includes a varying portion that creates different bristle exposure lengths at different positions, enabling progressive wiping action while maintaining manufacturability through controlled machining of the brush blank.
Data Source
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Figure 15A~16C
AI summary
The present invention relates to a packaging and applicator device (1) for applying a composition (P) to the eyelashes or the eyebrows, said device comprising: - a container(2) containing the composition; and - a brush (5) comprising: - a core that extends along a rectilinear longitudinal axis; and ·bristles that are connected to the core, the free ends of the bristles defining an envelope surface, the brush having a varying portion which cross-section varies along the longitudinal axis and passes through at least one maximum or minimum of section at a non-zero distance from its axial ends; the envelope surface not having a plane surface along the varying portion, and defining at least one facet(20) that is not plane and that is not parallel to the longitudinal axis of the core, the facet being defined by at least one edge that is never rectilinear and that is contained in a plane that passes through the core, the edge presenting a distance to the longitudinal axis of the core that passes through a maximum wherever the cross-section of the varying portion also passes through said maximum of section, and through a minimum wherever the cross-section of the varying portion also passes through said minimum of section.