Flexible Polymer Spatula for Streak-Free Nail Polish Application
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Solution Overview
Problem
Spatula-type nail varnish applicators often result in streaks due to their rigidity and straight or square tips, leading to imprecise application.
Innovation Solution
A nail varnish applicator with a spatula comprising separate tongues and tabs, where the tabs are designed to flex and separate, providing a more flexible and curved surface for uniform application, made from a polymer material with specific hardness and flexibility characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the spatula is divided into tabs to increase flexibility, then the applicator can better follow nail curvature, but the tabs become too rigid and create streaks on the nail
Solution Approach 1:
The spatula is segmented into multiple tabs (typically 3-5 tabs) separated by longitudinal slots, allowing each tab to move independently. This segmentation provides flexibility to follow nail curvature while reducing the width of each individual tab to prevent streak formation
Solution Approach 2:
The tabs are designed to be dynamically flexible rather than statically rigid. The longitudinal slots allow the tabs to bend and adapt to the nail surface during application, transforming the structure from rigid to dynamically adaptable
2Ease of manufacture
If the tip of the spatula is made straight or square for structural simplicity, then manufacturing is easier, but the application precision on the nail is reduced
Solution Approach 1:
The distal end of the applicator is designed with a curved tip rather than a straight or square edge. This curvature allows the applicator to better conform to the natural curvature of the nail surface, improving application precision and coverage
3Strength
If the tabs are made wider to increase structural strength, then the applicator maintains better rigidity, but the rigidity causes streaks during varnish application
Solution Approach 1:
Instead of making a single wide tab, the spatula is divided into multiple narrower tabs separated by longitudinal slots. This segmentation maintains overall structural strength while reducing the width of individual tabs to prevent streak formation during application
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 flexible and curved design allows for precise and uniform application of nail varnish without streaks, enhancing the applicator's ability to follow the nail's curvature and improve product distribution.
Implementation Method 1
the applicator has a certain flexibility at the tabs, this flexibility being even more accentuated at the level of the applicator tabs
Data Source
Figure 1
Figure 2~4C
AI summary
The invention relates to an applicator for liquid or viscous cosmetics, particularly nail polish, and its packaging assembly. The applicator 4 extends along a longitudinal extension direction (X) and comprises a distal end, referred to as the distal end of the applicator Ad, and a proximal end, referred to as the proximal end of the applicator Ap. The applicator comprises: - a tip 11, at its proximal end Ap, adapted to be fixed to a rod 3 of an applicator assembly 1; - a spatula 12, at its distal end Ad; - a base 13 connecting the tip 11 and the spatula 12. The tip 11, the base 13, and the spatula 12 are a single piece made of polymer material. The spatula 12 comprises: - at least two tabs 18, each having one end connected to a solid portion 14 of the spatula 12 and an opposite end; - at least two applicator tabs 20 formed as an extension of each tab 18 at the opposite end,Each leg 20 has a free end forming the distal end of the applicator.