Heated Tool Cutting Thermoplastic Bristles
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Solution Overview
Problem
Existing brush manufacturing methods face challenges with high blade wear and precise front trimming processes, which are time-consuming and inefficient, especially when dealing with thermoplastic bristles.
Innovation Solution
A method and device utilizing a heated tool, such as a flat wire, to cut bristles before or after attachment to the base part, leveraging heat and cutting geometry to minimize wear and facilitate high-speed cutting, with the option to use the hot knife in conjunction with a second unheated tool for fine trimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a sharp knife is used to cut bristles on the back of the guide part, then the bristles can be trimmed, but the blade experiences high wear
Solution Approach 1:
The patent replaces the mechanical cutting system (sharp knife) with a thermal cutting system (heated tool). The heated tool cuts bristles through thermal melting rather than mechanical shearing, eliminating blade wear while maintaining high cutting speed capability. This substitution of cutting mechanism directly resolves the contradiction between productivity and blade reliability.
Solution Approach 2:
The patent changes the cutting parameter from mechanical force to thermal energy. By heating the tool to sufficient temperature, the bristles are melted and separated rather than cut mechanically. This parameter change allows continuous operation without blade degradation, resolving the wear issue while maintaining productivity.
2Manufacturing precision
If front trimming is performed in several stages from coarse to fine, then precise brush surface profiling is achieved, but the process becomes time-consuming
Solution Approach 1:
The patent replaces multi-stage mechanical trimming with a single-stage thermal cutting process. The heated tool can directly achieve precise profiles without requiring progressive stages, as thermal melting provides clean, controlled cuts in one operation. This substitution eliminates the time-consuming multi-stage process while maintaining or improving precision.
Solution Approach 2:
The patent performs preliminary heating of the tool to enable it to perform both coarse and fine trimming in a single pass. The pre-heated tool can be moved at controlled speeds to achieve different levels of precision without requiring multiple tool changes or stages, thus reducing total process time while maintaining manufacturing precision.
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 solution results in a wear-free cutting process with reduced stress on bristles, enabling efficient profiling and attachment, while the heated tool's softening effect allows for bristle welding, improving positioning and fixing during processing.
Implementation Method 1
The heated tool comprises an electrical resistance heater in the cutting area or forms an electrical resistance heater itself
Implementation Method 2
The bristles are made of thermoplastic. The trimmed ends become soft when cut and stick together
Data Source
Figure 1a~1d
Figure 1e~1h
Figure 2~3
AI summary
The method involves attaching bristles at a base part (12) in a clumpful manner. The bristles are cut by a heated tool (70), which stays in contact with the bristles to be cut. The bristles are plugged into openings of the base part and are cut by the heated tool. Tool geometry and temperature of the tool are adjusted to brush geometry in such a manner that a bunch (16) of bristles or an adjacent bunch of bristles is welded together by cutting. The tool is arranged at distance from the base part and is displaced transverse to the bristles without a support body during cutting. An independent claim is also included for a device for manufacturing brushes.