Wire Coating Apparatus Using Progressive Heating for Solvent-Free Viscosity Control
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Solution Overview
Problem
Existing industrial techniques for coating wires with plastic materials rely heavily on solvents, which are expensive, carcinogenic, and energy-intensive, leading to environmental pollution and limited accuracy and uniformity in coating thickness, making them unsuitable for large-scale industrial production.
Innovation Solution
A coating apparatus that progressively heats thermosetting polymer materials through multiple temperature zones to achieve the desired viscosity for application, allowing for precise and efficient coating of wires without solvents, using a combination of heating elements and pressure control to ensure uniformity and control over the coating process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solvent-based coating techniques are used, then the coating can be applied to wire, but the process becomes expensive, polluting, and energy-intensive
Solution Approach 1:
The invention extracts and removes the solvent component from the coating system, using only thermosetting polymer materials without any solvent carriers. This eliminates the harmful environmental effects and costs associated with solvent evaporation, while maintaining the coating application capability through direct heating and viscosity control of the polymer material.
Solution Approach 2:
The invention changes the physical parameters of the coating material by heating it to controlled temperatures (typically 80-200°C) to achieve the desired viscosity for coating application. This parameter change allows the thermosetting polymer to become coatable without requiring solvent dissolution, thereby eliminating solvent-related harmful effects while maintaining manufacturing capability.
2Ease of manufacture
If solvent-based coating is used, then coating can be applied, but the coating thickness accuracy and uniformity are poor
Solution Approach 1:
The invention incorporates feedback control mechanisms where the viscosity of the thermosetting polymer is monitored and controlled through precise temperature regulation. This feedback loop ensures that the coating material maintains consistent rheological properties during application, resulting in uniform coating thickness and high manufacturing precision.
Solution Approach 2:
By precisely controlling the temperature parameter of the thermosetting polymer, the invention achieves optimal and consistent viscosity for coating application. This parameter control ensures uniform flow characteristics of the coating material, leading to accurate and uniform coating thickness without the variability associated with solvent-based systems.
3Manufacturing precision
If multiple passes through coating apparatus are made, then required coating thickness is achieved, but production time and complexity increase
Solution Approach 1:
The invention changes the viscosity parameter of the thermosetting polymer through controlled heating, allowing the material to achieve optimal coating properties in a single pass. This eliminates the need for multiple repetitive coating cycles, thereby increasing production speed while maintaining the required coating thickness precision.
Solution Approach 2:
The invention performs preliminary heating and viscosity adjustment of the thermosetting polymer before coating application. This preliminary preparation ensures that the material is in the optimal state for coating in a single pass, eliminating the need for subsequent re-coating operations and thereby improving productivity.
4Speed
If heating is performed quickly to evaporate solvent, then coating process is faster, but blisters form on the wire
Solution Approach 1:
The invention removes the solvent component entirely from the system, eliminating the need for rapid solvent evaporation through high-temperature heating. Without solvent to evaporate, there is no risk of blister formation, allowing the wire to be heated at controlled speeds without compromising coating quality.
Solution Approach 2:
The invention utilizes controlled phase transitions of the thermosetting polymer through gradual heating, transforming the material from a viscous state to a coatable state without rapid vaporization. This controlled phase change prevents blister formation while maintaining efficient coating speeds, as the polymer cures uniformly without solvent evaporation.
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
This method enables the production of coated wires with improved accuracy, safety, and cost-effectiveness, allowing for precise control over coating thickness and uniformity, reducing environmental impact, and enabling efficient industrial-scale production.
Implementation Method 1
a number of heating elements are provided around the injection channel and are arranged and controllable to heat at least some plastic coating material in the injection channel to at least a first temperature such that the at least some plastic coating material heated to the at least first temperature is in a state that is able to flow down the length of the injection channel
Implementation Method 2
a number of heating elements are provided around the coating chamber that are arranged and controllable to further heat at least some plastic coating material to at least a second temperature, higher than the first temperature, in the coating chamber, such that the plastic coating material has said desired viscosity at the second temperature
Implementation Method 3
a pressuriser is provided in the injection channel that is arranged and controllable to pressurise the plastic coating material in the injection channel to a pressure that forces the plastic coating material down the injection channel and into the coating chamber
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Disclosed herein is an apparatus for applying a coating material to a wire, the apparatus comprising: a coating chamber for applying a coating material to a wire passing through the coating chamber; an elongate injection channel for receiving coating material input to the coating apparatus at a first end of the injection channel through an inlet portion and supplying the received coating material to the coating chamber that is arranged at a second end of the injection channel wherein the inlet portion intersects a side wall of the elongate injection channel, the side wall extending between the first end and the second end of the elongate injection channel; and, a number of heating elements controllable to progressively raise the temperature of the coating material as the coating material flows through the coating apparatus to achieve a desired viscosity of the coating material within the coating chamber. Advantages include providing an industrial process for applying a coating to a wire that is easier, safer and cheaper than known solvent based techniques.