Vacuum Table with Segmented Chamber for Substrate Retention
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Solution Overview
Problem
Vacuum tables in corona discharge treatment units face challenges in maintaining a consistent retaining force on substrates of varying types and grammages, as existing systems do not effectively control gas flow rates to adjust for different substrate properties, leading to inadequate surface tension modification and potential substrate lifting during processing.
Innovation Solution
A vacuum table system with a controller that adjusts gas flow rates through a vacuum plate using a valve, partitioning the vacuum chamber into separate sections to control gas flow independently, allowing for tailored retaining forces based on substrate type, grammage, and surface properties, ensuring proper substrate retention and surface treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single vacuum chamber is used without gas flow control, then the structure is simple, but the retaining force cannot be adjusted for different substrate types
Solution Approach 1:
The vacuum chamber is divided into multiple independently controllable vacuum zones, each with its own gas flow control. This allows different retaining forces to be applied to different substrate regions or to different substrates simultaneously, resolving the contradiction by enabling adaptability through structural segmentation.
Solution Approach 2:
The system incorporates dynamic gas flow control mechanisms that allow the retaining force to be adjusted in real-time based on substrate properties. This dynamic adjustment capability enables the same vacuum chamber structure to adapt to different substrate types without requiring multiple fixed configurations.
2Manufacturing precision
If gas flow rate is not controlled, then the system is simple to operate, but surface tension modification is insufficient for varying substrate grammages
Solution Approach 1:
The system incorporates feedback mechanisms that monitor substrate properties and automatically adjust gas flow rates to achieve optimal surface tension modification. This feedback control resolves the contradiction by automating the adjustment process, maintaining manufacturing precision while reducing operational complexity.
Solution Approach 2:
The system enables precise control of gas flow rate parameters to optimize surface tension modification for different substrate grammages. By providing controlled parameter adjustment, the system achieves high manufacturing precision while maintaining ease of operation through standardized control interfaces.
3Reliability
If uniform vacuum is applied to all substrates, then the vacuum system is simple, but substrate lifting occurs during processing
Solution Approach 1:
The vacuum system is segmented into multiple independently controllable zones, allowing differential vacuum application to prevent substrate lifting in specific regions while maintaining overall system simplicity through modular design.
Solution Approach 2:
The system applies local quality control by providing different vacuum levels to different substrate regions based on their specific retention requirements. This localized adjustment prevents substrate lifting without requiring complete system redesign, resolving the contradiction between reliability and complexity.
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 system effectively maintains substrates of different types and grammages by varying gas flow rates, enhancing surface tension modification and preventing substrate lifting, thereby improving the efficiency and reliability of downstream processes like printing operations.
Implementation Method 1
a vacuum plate separating a substrate zone for receiving a substrate onto the vacuum plate from a vacuum chamber, the vacuum chamber being in communication with a vacuum source
Implementation Method 2
a valve to control a gas flow rate through the vacuum plate
Implementation Method 3
the treatment equipment 26 comprises conductors for ionising gas within the substrate zone 60
Data Source
AI summary
There is disclosed a vacuum table 400 comprising a vacuum plate 402 separating a first vacuum chamber 406 from a substrate zone 60 for receiving a substrate 50. The vacuum plate has a plurality of suction holes 404 for conveying a gas flow from the substrate zone 60 to the first vacuum chamber 406. There is an evacuation port 422 in communication with a second vacuum chamber 420 to evacuate gas from the substrate zone 60 when a substrate 50 is received over the suction holes 404 of the vacuum plate 402, and a vacuum port 424 for discharging gas received in the second vacuum chamber 420 to a vacuum source 423. The first vacuum chamber 406 and the second vacuum chamber 420 are in fluid communication via a valve 430 so that gas flows from the first vacuum chamber 406 to the vacuum port 424 via the second vacuum chamber 420. The valve 430 is controllable to vary a gas flow rate through the vacuum plate 402 and thereby vary a retaining force on a substrate 50 received thereon.