Coating Station Supply Line Segmentation for Vacuum Speed
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Solution Overview
Problem
Existing coating stations face challenges in quickly and reliably setting negative pressure conditions for plasma-based coating processes, particularly for thin-walled containers like PET bottles, which are sensitive to pressure differences, leading to potential damage and prolonged process times.
Innovation Solution
The coating station employs a supply line divided into sub-lines with switchable valves, allowing for an enlarged flow cross-section without the need for a large, slow valve, and ensures uniform flow resistance across partial lines to facilitate faster and more consistent pressure adjustments during pumping and ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pumping capacity is increased by adding further pumps, then the negative pressure can be established more quickly, but the process time is prolonged due to limiting pump line cross-sections
Solution Approach 1:
The supply line is divided into multiple sub-lines at a branch point, with each sub-line having its own switchable valve. This segmentation allows multiple pumps to connect to the chamber simultaneously through parallel sub-lines, increasing the total flow cross-section and enabling faster establishment of negative pressure without prolonging process time
2Loss of time
If the pump cross-section is enlarged to reduce process time, then negative pressure can be set faster, but the valve size increases and switching speed decreases
Solution Approach 1:
Instead of using one large valve in a single enlarged pump line, the system segments the supply line into multiple sub-lines, each with its own smaller switchable valve. This allows the total flow cross-section to be enlarged while maintaining small, fast-switching valves in each parallel sub-line
Solution Approach 2:
Multiple smaller sub-lines with individual valves are merged into a common supply line that connects to the chamber. The combined flow capacity of all sub-lines equals or exceeds that of a single large line, achieving the same pumping capacity with faster valve switching
3Ease of manufacture
If thin-walled containers are used to reduce costs, then material costs decrease, but the containers become more sensitive to pressure differences and risk damage
Solution Approach 1:
The system establishes negative pressure in the chamber surrounding the container before initiating the coating process. By pre-establishing the pressure environment and monitoring it continuously, the system protects thin-walled containers from damage while enabling the coating process to proceed
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 enables quicker and more reliable setting of negative pressure conditions, reducing the risk of container damage and achieving shorter process times while maintaining consistent coating quality across multiple chambers.
Implementation Method 1
The supply line is divided into sub-lines at a branch located between its beginning and end, with a switchable valve being arranged in each sub-line
Implementation Method 2
a workpiece is to be coated using a coating process... coatings applied using a PECVD process, in particular a microwave-induced PECVD process
Implementation Method 3
coatings applied using a PECVD process, in particular a microwave-induced PECVD process
Implementation Method 4
negative pressure conditions must be established in the area of the workpiece to be coated to enable the formation of a plasma
Data Source
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AI summary
The invention relates to coating stations (1) for coating workpieces (5) in a coating process carried out on the coating station (1), wherein the coating station (1) has at least one coating chamber (17) which can be converted into an open and a closed state and into which the workpiece (5) to be coated can be arranged for the purpose of coating, wherein the chamber (17) is formed by chamber walls (18, 29) which have sealing devices (41), wherein the chamber (17) is thereby sealed against the external environment in the closed state. The coating station (1) has one or more connections (42) for connection to at least one negative pressure source (44, 49) and/or pressure equalization source, each designated as a source of operating medium for an operating medium, wherein the operating medium and/or all operating media within the station (1) are supplied by the connection (42) or the pressure equalization source.The operating medium is routed from the connections via an associated supply line (54) beginning at connection (42) to the chamber (17) and/or to the workpiece (5), with the supply line (54) having its end there. The supply line (54) divides into sub-lines (46, 70, 80) at at least one branch (55) located between its beginning and end, with a switchable valve (48) being arranged in each sub-line (46, 70, 80).