Brush High Density Zone for Gummy Formulation Transfer
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Solution Overview
Problem
Existing brushes struggle to efficiently and uniformly apply formulations, especially gummy formulations, to fine hairs due to inadequate bristle density and spacing, leading to poor transfer and clumping issues.
Innovation Solution
The brush features a high density zone with a linear bristle density of 13 to 31 bristles per 0.5mm of core length and a surface bristle density of 3 to 5 bristles per square millimeter, along with varying bristle lengths and recesses on the core to store formulation, optimizing the application process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bristle density is increased to improve formulation transfer, then application efficiency improves, but bristle spacing becomes too small allowing fine hairs to enter gaps between bristles
Solution Approach 1:
The brush is divided into multiple bristle rings spaced apart along the longitudinal axis, with each ring containing multiple bristles spaced radially apart. This segmentation allows formulation to be transferred through multiple discrete contact points while maintaining sufficient spacing between bristles in each ring, preventing fine hairs from entering gaps between bristles.
Solution Approach 2:
The brush transitions from a single-plane bristle arrangement to a three-dimensional configuration with multiple bristle rings at different axial positions. This dimensional change increases the effective bristle density for formulation transfer while maintaining adequate spacing between individual bristles, as hairs can pass between rings while formulation contacts bristles across multiple levels.
2Manufacturing precision
If bristle density is increased to prevent clumping, then application uniformity improves, but formulation storage capacity decreases
Solution Approach 1:
The brush core includes multiple recesses distributed along the longitudinal axis, with each recess storing formulation independently. This segmentation allows the brush to hold significant total formulation volume while maintaining low local bristle density in each region, ensuring uniform application without clumping.
Solution Approach 2:
Different regions of the brush have different functional properties: recesses are positioned to store formulation, while bristle rings are positioned to apply it uniformly. The local bristle density is optimized for application uniformity in the bristle regions, while the recess regions provide bulk storage capacity without interfering with application quality.
3Productivity
If bristle spacing is reduced to improve formulation transfer, then application efficiency improves, but fine hairs cannot enter gaps between bristles
Solution Approach 1:
Multiple bristle rings are positioned at different axial distances from the core, creating vertical spacing between bristles in different rings. This allows fine hairs to pass between rings while bristles in each ring maintain sufficient radial density for efficient formulation transfer to the hair shaft.
Solution Approach 2:
The bristle arrangement is segmented into multiple discrete rings rather than a continuous dense layer. This segmentation creates pathways between rings for fine hair penetration while maintaining adequate bristle density within each ring for effective formulation application.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A brush for applying a formulation has a core and a plurality of bristle rings protruding from the core and spaced apart along the longitudinal axis. Each bristle ring has at least 6 bristles spaced radially apart around an outer surface of the core, and a high density zone that covers at least a portion of the outer surface of the core. The high density zone has an equivalent 360 degree linear bristle density of 13 to 31 whole bristles per 0.5mm of length along the outer surface of the core measured along a longitudinal axis of the core, and a surface bristle density of 3 to 5 bristles per square millimeter of area of the outer surface of the core.