Dual-Brush Mascara Design for Lash Precision
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Solution Overview
Problem
Conventional mascaras with soft brushes made of injectable rubber or elastomer struggle with fine adjustments required for achieving sophisticated effects like long lash and clean, as they are difficult to manipulate effectively.
Innovation Solution
A mascara design featuring a first brush made of softer materials like rubber or elastomer and a second brush made of harder polybutylene terephthalate (PBT), allowing for precise adjustments and improved retention of mascara liquid through a combination of differently sized and structured hairs, with the first brush being injection-molded and the second brush being fixed with a coupling member for enhanced peeling strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft brush made of rubber or elastomer is used, then the brush can retain mascara liquid well and achieve volume and curl effects, but fine adjustment is difficult for achieving sophisticated effects like long lash and clean
Solution Approach 1:
The brush is divided into two distinct parts: a first brush made of soft rubber or elastomer for retaining mascara liquid and creating volume/curl, and a second brush made of hard PBT for fine adjustment and precision application. This segmentation allows each part to specialize in its function without compromise
Solution Approach 2:
Different parts of the brush have different material properties tailored to their specific functions. The first brush uses soft material for liquid retention and volume creation, while the second brush uses hard material for precise control and fine adjustment, optimizing performance in each local area
2Ease of operation
If a hard brush is used for fine adjustment, then precise control is achieved, but the brush cannot retain mascara liquid effectively
Solution Approach 1:
The brush system is segmented into two functional units: the first brush (soft) handles liquid retention and application, while the second brush (hard) handles fine adjustment and precision work, allowing each to excel at its designated task
Solution Approach 2:
The combined brush system performs multiple functions that a single brush cannot achieve: both mascara liquid retention and fine adjustment capabilities are integrated into one tool, providing universal functionality for various eyelash effects
3Ease of manufacture
If the first brush is injection-molded with the base, then manufacturing is simplified, but the peeling strength may be insufficient
Solution Approach 1:
The first brush is injection-molded directly onto the base, merging two components into a single integrated piece. This eliminates separate assembly steps and ensures strong bonding between the brush and base through the molding process itself
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 enables precise control for achieving long lash and clean effects by utilizing the soft first brush for volume and curl, and the hard second brush for fine adjustments, while improving the peeling strength and durability of the brushes.
Implementation Method 1
the brush must be able of retaining the mascara liquid well
Implementation Method 2
the materials of the first brush and the second brush are formed differently... the material of the first brush includes rubber or elastomer
Implementation Method 3
the material of the first brush may be formed softer than the material of the second brush... the material of the second brush may include polybuttery terephthalate (PBT)
Implementation Method 4
the first brush can be injection-molded in a state where the base and the second brush are combined
Data Source
AI summary
A mascara includes a first brush extended in one side direction and a second brush extended in the other direction, the materials of the first brush and the second brush are formed differently, a plurality of second hairs constituting the second brush are coupled by a line chamber, and the plurality of second hairs coupled by the line chamber are fixed by adding a fixing clip.