Undulating Plug Strip for Paint Brush Bristle Packing
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Solution Overview
Problem
Conventional paint brushes lack effective mechanisms for optimizing bristle packing and increasing the usable surface area and well area within the bristle body, leading to inefficient coating application.
Innovation Solution
The use of a plug strip with an undulating surface featuring tapered ridges and valleys, where the pitch between the valleys is no greater than the pitch between the ridges, enhances bristle packing and creates a larger well area within the bristle body, improving coating performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional smooth plug strip is used, then the structure is simple and easy to manufacture, but the bristle packing is poor and the usable surface area is reduced
Solution Approach 1:
The plug strip features localized undulating surfaces with tapered ridges and valleys at specific regions where bristles need to be retained, rather than modifying the entire plug strip structure. This allows targeted improvement in bristle packing quality while keeping other portions of the plug strip simple and easy to manufacture.
Solution Approach 2:
The plug strip incorporates curved undulating surfaces with tapered ridges and valleys instead of flat surfaces. These curved features naturally guide and pack bristles more effectively into the ferrule, improving bristle retention and usable surface area while maintaining manufacturability through standard molding processes.
2Area of stationary object
If a plug strip with undulating surface is used, then the usable surface area of bristles is increased, but the manufacturing complexity increases
Solution Approach 1:
The undulating surface features are defined by specific geometric parameters including ridge spacing (pitch), valley depth, and taper angles. By optimizing these parameters within certain ranges, the plug strip achieves maximum usable bristle surface area while remaining compatible with standard injection molding or extrusion manufacturing processes.
3Manufacturing precision
If the pitch between valleys is greater than the pitch between ridges, then the bristle retention is improved, but the well area within bristle body is reduced
Solution Approach 1:
The plug strip design employs asymmetric pitch relationships between ridges and valleys, where the pitch between valleys is specifically controlled to be no greater than the pitch between ridges. This asymmetric configuration creates optimal spacing for both bristle retention in the valleys and adequate well area formation within the bristle body for coating storage.
Data Source
AI summary
A brush of the present disclosure includes a handle, a plurality of bristles, and a sleeve configured to couple the plurality of bristles to the handle. A plug strip is disposed within the sleeve and may be configured to orient the plurality of bristles to provide increased coating performance. The plug strip has opposed sides extending along a central longitudinal axis of the plug strip. At least one of the opposed sides has an undulating surface forming tapered ridges alternating with tapered valleys.