Moulded Lip Brush Bristle-Braid Flexural Element
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Solution Overview
Problem
Conventional cosmetic brushes with long, fine bristles face issues such as dimensional instability, poor mass storage capacity, rigidity, and susceptibility to contamination, along with manufacturing costs and the 'umbrella effect' due to bristle bending and bacterial growth.
Innovation Solution
A cosmetic brush design featuring a handle with a one-piece flexible bending element and short, fine bristles, where the bending element replaces non-functional bristle sections, providing flexibility and precise application contours, using materials like Hytrel and Grilflex for durability and elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional brushes use long, fine bristles to achieve soft brush tip, then application softness is improved, but dimensional stability deteriorates due to swelling and deformation over time
Solution Approach 1:
The brush applicator is segmented into distinct functional zones: a rigid mounting section for structural stability, a flexible bending element for adaptability, and short fine bristles for soft application. This segmentation allows each zone to perform its specific function without compromising the others, resolving the contradiction between softness and stability.
Solution Approach 2:
Different parts of the brush applicator are given different mechanical properties: the mounting section is rigid for stability, the bending element is flexible for adaptability, and the bristle tips are fine and soft for gentle application. This local differentiation of material properties allows the brush to simultaneously achieve softness where needed and stability where required.
2Quantity of substance
If brushes use densely packed long bristles to improve mass storage capacity, then cosmetic product storage is improved, but contamination risk worsens due to bacterial growth inside the fiber covering
Solution Approach 1:
The harmful deep interior zones where bacteria can thrive are eliminated by replacing long bristles with short bristles mounted on a solid bending element. This extraction of the problematic bristle shafts removes the hidden spaces where contamination occurs, while retaining the beneficial bristle tips for product storage and application.
Solution Approach 2:
The bending element is designed with a porous structure that allows cosmetic product to be stored within its matrix, providing mass storage capacity without requiring a dense covering of long bristles. This porous storage mechanism eliminates the hidden spaces between long bristles where bacteria could grow.
3Adaptability or versatility
If brushes use long bristles to achieve flexibility, then brush adaptability is improved, but manufacturing cost worsens due to complex assembly requirements
Solution Approach 1:
The bending element integrates multiple functions into a single component: it provides structural support, enables brush flexibility and adaptability, and serves as the mounting base for the bristles. This merging of functions into one injection-molded piece simplifies manufacturing while maintaining the necessary flexibility and adaptability.
Solution Approach 2:
The brush applicator uses composite construction combining a rigid mounting section, a flexible bending element made from elastomeric material, and fine bristle tips. This composite approach allows each material to be optimized for its specific function while being manufactured as an integrated unit, reducing overall manufacturing complexity.
4Stability of the object's composition
If brushes use monolithic plastic body to improve dimensional stability, then structural stability is improved, but mass storage capacity worsens due to hard tip and reduced product holding
Solution Approach 1:
The brush applicator features local quality differentiation where the mounting section and bending element provide rigid dimensional stability, while the distal bristle tips provide the soft, porous structure necessary for mass storage of cosmetic products. This local differentiation allows the same object to exhibit both stability and product-holding capacity in different regions.
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 design ensures long-term dimensional stability, improved mass storage, reduced contamination risk, and precise application, while being cost-effective and resistant to bristle buckling and bacterial growth.
Implementation Method 1
a generally one-piece, flexible bending element... The bending element is designed to be flexible enough to ensure the necessary flexibility for the desired application properties at the level of the brush tip
Implementation Method 2
a bristle arrangement consisting of a plurality of bristles injection-molded in one piece
Data Source
Figure 1a~1d
Figure 2a~2d
Figure 3a~3d
AI summary
The cosmetic brush has a handle with a longitudinal axis and a brush applicator adjacent to the handle. The brush applicator (1) has a flexural element (3) with a longitudinal axis and the flexural element has a bristle-braid at its distal end consisting of multiple integrally molded bristles (7). The longitudinal axis of the bristle-braid runs parallel to the longitudinal axis of the flexural element.