Bias-Electrode Plasma Chambers for Multi-Step Roll-to-Roll Treatment
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Solution Overview
Problem
Existing plasma treatment apparatuses for roll-to-roll methods complicate and cost excessively due to the need for changing treatment conditions, as both the base material and conveyance system share the same negative potential, making it impractical for multiple plasma treatment processes.
Innovation Solution
A plasma treatment apparatus with a treatment chamber at ground potential, using an inductive coupling antenna unit and a bias electrode to control plasma potential and suppress diffusion, allowing for multiple processes with different conditions by varying the bias potential, while maintaining the base material and conveyance system at ground potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If negative DC voltage or negative pulse voltage is applied to the base material for ion irradiation in plasma treatment, then plasma treatment can be performed, but the base material and conveyance system must share the same negative potential, making the device complicated and expensive when multiple plasma treatment processes are required
Solution Approach 1:
The invention divides the plasma treatment system into multiple independent treatment chambers, each capable of performing different plasma treatment processes. Each chamber has its own antenna unit and bias electrode, allowing independent control of treatment conditions without affecting other chambers. This segmentation enables multiple plasma treatment processes to be performed simultaneously with different parameters while keeping the overall system manageable.
Solution Approach 2:
The bias electrode serves as an intermediary component between the antenna unit and the base material. It applies bias potential to control ion irradiation independently from the base material potential, enabling flexible control of plasma treatment conditions. This intermediary structure allows the base material to remain at ground potential while still achieving effective plasma treatment through controlled ion bombardment.
2Productivity
If multiple plasma treatment chambers are provided with different treatment conditions, then various plasma treatment processes can be continuously performed, but the cost of the apparatus increases
Solution Approach 1:
The invention designs each treatment chamber with a universal structure comprising an antenna unit, bias electrode, and basic plasma generation components. This standardized modular design allows the same chamber configuration to be replicated multiple times, reducing manufacturing costs through economies of scale. Each chamber can be configured for different plasma treatment processes by adjusting operational parameters rather than requiring completely different hardware designs.
Solution Approach 2:
The invention enables different plasma treatment processes by changing operational parameters such as bias potential, gas flow rates, and power settings rather than requiring fundamentally different chamber designs. This parameter-based differentiation allows a single chamber design to support multiple treatment processes including cleaning, surface activation, and coating, reducing the need for multiple specialized chambers and associated costs.
3Reliability
If the base material is held at ground potential while applying bias potential to plasma, then safety is improved and device complexity is reduced, but control over plasma treatment conditions must be achieved through bias electrode alone
Solution Approach 1:
The bias electrode acts as an intermediary that provides independent control over ion irradiation conditions while keeping the base material at ground potential. By applying bias potential to the electrode rather than the base material, the system achieves safe operation with improved electrical isolation while maintaining full control over plasma treatment parameters through the bias voltage and power settings.
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
Enables efficient and cost-effective continuous plasma treatment with reduced complexity and improved safety by allowing multiple processes with different conditions without applying high-frequency voltage to the base material, facilitating simultaneous and sequential treatments across multiple chambers.
Implementation Method 1
generate plasma using an induced electromagnetic field generated in the vicinity of the antenna conductor
Implementation Method 2
a bias electrode which applies a bias potential to the plasma, the bias electrode being disposed around a plasma generation region in which the plasma is generated
Data Source
AI summary
A plasma treatment apparatus is constituted by a treated base material at a ground potential in a plasma treatment chamber and an inductive coupling antenna unit disposed to face the base material, and a bias electrode which modulates a plasma potential is provided between them. In addition, an in-line type plasma treatment apparatus in which a plurality of the treatment chambers are connected is provided.