Discharge Electrode Gas Passage Layout for Uniform Plasma Treatment
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Solution Overview
Problem
Conventional surface modifying devices face issues with nonuniform gas pressure distribution in the discharge electrode, leading to variations in surface modification precision and instability, especially when reducing the amount of replacement gas supplied, which affects the treatment of wide films like those with a width of 10 meters.
Innovation Solution
The device employs a manifold pipe system with gas guide holes and a supporting member to maintain uniform gas pressure and directivity, ensuring stable surface modification by evenly distributing replacement gas through the electric field, even with reduced gas usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If replacement gas is supplied into the entire electrode chamber, then the gas concentration can be maintained, but the amount of replacement gas required increases significantly for wide films
Solution Approach 1:
The gas supply system is segmented into multiple regions corresponding to different sections of the wide film. Instead of supplying gas uniformly to the entire electrode chamber, the patent divides the discharge electrode into multiple segments with individual gas supply channels, allowing localized gas distribution matched to the actual discharge regions across the film width.
Solution Approach 2:
The patent applies local quality by providing different gas concentrations and flow rates to different regions of the electrode chamber based on local discharge characteristics. Gas is supplied directly to specific discharge regions rather than uniformly throughout the chamber, optimizing gas utilization while maintaining surface modification precision in each local area.
2Area of stationary object
If the electrode chamber is enlarged to accommodate wide films, then the treatment capacity increases, but the gas supply requirement and system complexity increase
Solution Approach 1:
The electrode chamber and discharge electrode are segmented into multiple independent sections, each with its own gas supply channel. This segmentation allows the system to handle wide films by extending the treatment area while maintaining manageable gas supply complexity through modular, distributed gas distribution rather than a single complex supply system.
3Manufacturing precision
If replacement gas is supplied directly to the discharge region, then gas concentration uniformity improves, but gas pressure nonuniformity along the supply direction increases
Solution Approach 1:
The patent incorporates preliminary action by introducing throttle members (such as adjustable valves or flow restrictors) in each gas supply channel before the gas reaches the discharge region. These throttle members pre-regulate the gas flow and pressure in each channel, compensating for pressure drops and ensuring uniform gas pressure and concentration at the discharge regions across the entire film width.
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 configuration stabilizes surface modification treatment on wide films by maintaining uniform gas pressure and preventing pressure variations, allowing for efficient plasma generation with minimal gas consumption.
Implementation Method 1
a surface modifying device that uses a corona discharge to perform surface treatment on the surface of a base material
Implementation Method 2
a high-frequency voltage is applied to the discharge electrode to generate an electric field between the discharge electrode and the above-described treatment roller
Data Source
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AI summary
[Problem] The present invention addresses the problem of reducing the supply quantity of a replacement gas by directly discharging the gas from a discharge electrode, and stabilizing plasma generation by uniformizing gas pressure distribution. [Solution] A discharge electrode E in an electrode chamber C comprises a plurality of electrode members 8, 9. The electrode members 8, 9 are disposed facing each other by having a supporting member 4 therebetween, a gap is formed between the facing portions of the electrode members 8, 9, and by having the gap as a gas passageway 15, the gas passageway is opened in the leading end of the discharge electrode. A replacement gas having been supplied from a manifold pipe 3 is supplied to the gas passageway 15 via an orifice.