Electrostatic Coating Apparatus with Multichamber Enclosure
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Solution Overview
Problem
Existing electrostatic coating apparatuses face challenges in adequately fluidizing powder particles, protecting conductors from the particle stream, and uniformly depositing particles onto a medium, often resulting in suboptimal ion collection and corona discharge issues.
Innovation Solution
An electrostatic coating apparatus with a multichamber enclosure and variable openings, utilizing air knives for particle suspension and directional electrodes to create a controlled electrostatic field, allowing for successive layer coating of powders onto a medium while protecting conductors and optimizing particle distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-level energy conductor is placed at the source of the particle stream to ionize the powder, then ionization effectiveness is improved, but corona discharge risks and safety hazards increase
Solution Approach 1:
The patent divides the charging function into two separate components: a conductor that charges particles through contact as they pass by, and a separate ionization region. This segmentation allows the conductor to be positioned away from the particle stream source, eliminating corona discharge risks while maintaining effective particle charging through the enclosed charging chamber design.
2Manufacturing precision
If a highly charged conductive net structure is placed in proximity to the medium, then particle deposition is improved, but safety hazards and electrical field management complexity increase
Solution Approach 1:
The patent extracts the high-voltage conductor from the immediate particle stream path and places it within an enclosed charging chamber. The conductor charges particles through contact as they pass by the enclosed structure, and the charged particles then exit the enclosure to be deposited on the medium. This extraction eliminates the need for complex high-voltage management in the deposition region while maintaining effective particle charging.
3Reliability
If particles are placed in a closed enclosure for charging, then ion collection is improved, but conductor protection from particle stream becomes challenging
Solution Approach 1:
The patent employs a nested structure where the conductor is placed inside an enclosed charging chamber that is itself part of the larger coating apparatus. The enclosed chamber protects the conductor from direct particle stream impact while allowing charged particles to exit through controlled openings for deposition on the medium. This nested design simultaneously achieves both ion collection efficiency and conductor protection.
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 apparatus effectively fluidizes particles, protects conductors, and ensures uniform deposition of powders onto a medium, addressing the limitations of existing technologies by improving particle suspension and distribution while minimizing corona discharge risks.
Implementation Method 1
ionized particles are formed. These ions are collected on the surface of the item in the corona discharge zone around a conductor
Implementation Method 2
the force felt by two bodies charged with opposite polarity is an attractive force. Once the powder particles in a stream are charged, either by removing or adding surface electrons, the particles are then drawn by the electromagnetic force to a grounded medium
Implementation Method 3
an apparatus able to adequately fluidize the particles from a powder source and place them in a particle stream
Data Source
AI summary
The present invention generally relates to an electrostatic coating apparatus for spraying a stream of particles onto a medium, and in particular to an apparatus equipped with a powder coating suspension device such as a multivolume chamber, or a air stream creation device. What is also contemplated is the use of a plurality of variable openings in the enclosure, used in conjunction with a plurality of conductors, to dispose a stream of particles onto a moving medium in successive layers. In yet another embodiment, the stream of particles is directed in a directional electrical field created by electrodes placed adjacent to directional shields. The present disclosure relates to an in-line industrial device able to coat paint, starch, thermoplastic materials, or any other powder material onto a medium by successively controlling a plurality of parameters.