Curable Nail Sticker Soft Layer Adhesion
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Solution Overview
Problem
Nail stickers with curved shapes often lift at the tip and fail to adhere smoothly to fingernails or toenails with sharp curves, leading to contamination and reduced adhesive strength, especially when the nail surface is uneven.
Innovation Solution
A curable nail sticker with a soft layer containing cellulose acetate butyrate or cellulose acetate propionate, which increases in thickness when pressure is applied, filling gaps between the nail and the sticker, and maintaining deformation to prevent lifting and ensure smooth adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a nail sticker with a curved shape is used to fit fingernail or toenail shapes, then the adhesive strength is improved, but the lifting phenomenon occurs at the tip area when the nail has a sharp curve
Solution Approach 1:
The nail sticker incorporates a soft layer made of flexible materials including silicone rubber, fluororubber, or thermoplastic elastomer. This soft layer allows the sticker to conform to the curved surface of the nail while maintaining adhesion, preventing the lifting phenomenon that occurs with rigid curved stickers on sharply curved nails
Solution Approach 2:
The patent changes the physical parameters of the nail sticker by introducing a soft layer with specific material properties (silicone rubber, fluororubber, or thermoplastic elastomer) and controlling its thickness (1-10 μm). This allows the sticker to dynamically adapt to different nail curvatures, maintaining both adhesive strength and preventing lifting at the tip
2Strength
If the nail sticker is deformed to fit the nail shape, then the adhesive strength is improved, but the surface of the nail sticker becomes excessively uneven
Solution Approach 1:
The nail sticker is divided into multiple functional layers: a base layer, a soft layer, and a decorative layer. The soft layer acts as a buffer that deforms to match the nail surface irregularities, while the decorative layer maintains a smooth surface, thus separating the conforming function from the aesthetic function
Solution Approach 2:
The soft layer serves as an intermediary between the rigid decorative layer and the irregular nail surface. It absorbs the surface irregularities through its deformability, allowing the decorative layer to maintain a smooth appearance while the underlying soft layer conforms to the nail shape for better adhesion
3Reliability
If pressure is applied to the nail sticker after attachment, then the soft layer deforms to fill gaps, but the nail sticker structure may be damaged
Solution Approach 1:
The soft layer is designed with sufficient thickness (1-10 μm) and appropriate material properties before attachment to provide a cushioning effect. This pre-designed buffer capacity allows the layer to deform under pressure to fill gaps between the nail and sticker without causing structural damage, as the soft material can absorb the mechanical stress
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 soft layer effectively reduces foreign body sensations, enhances adhesive strength, and maintains a smooth surface even on irregular nail surfaces, preventing contamination and deformation.
Implementation Method 1
a soft layer, wherein a maximum thickness of the soft layer is increased when a pressure is applied to a part of an upper surface of the nail sticker after attaching the nail sticker on a flat floor
Data Source
AI summary
The present invention relates to a nail sticker and the nail sticker is a curable nail sticker. The nail sticker includes a soft layer, the soft layer includes a resin for the soft layer, and the resin for the soft layer may include at least one of cellulose acetate butyrate and cellulose acetate propionate.