Intermittent Thin-Film Coating with Dynamic Tension Control
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Solution Overview
Problem
Conventional intermittent coating methods struggle to form thin films with a thickness of 20 μm or less on substrates, resulting in wavy and non-uniform trailing coating edges due to poor responsivity and stability, making them unsuitable for high-productivity applications like battery electrode plates.
Innovation Solution
A method involving a band-shaped substrate looped over stationary and actuation rollers, with a tension roller maintaining constant tension and a backup roller providing additional support, allows for precise control of the coating process, ensuring uniform application and accurate straight-line formation of thin films even on wide substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional intermittent coating methods are used, then coating can be applied to substrates, but the trailing coating edge becomes wavy and non-uniform due to poor responsivity and stability
Solution Approach 1:
The patent implements dynamic response control by detecting the trailing edge position of the coating and automatically adjusting the coating application timing and duration. This dynamic adjustment system ensures that the coating is applied uniformly across the substrate width while maintaining stable trailing edge formation, resolving the contradiction between manufacturing precision and process reliability.
Solution Approach 2:
The patent employs feedback control mechanisms where sensors detect the actual coating trailing edge position and feed this information back to the control system. The control system then adjusts the coating application parameters in real-time to maintain uniform trailing edges, directly addressing the stability and precision issues in conventional intermittent coating methods.
2Manufacturing precision
If coating thickness is reduced to 20 μm or less, then thin film coating is achieved, but conventional methods cannot maintain uniformity and accuracy
Solution Approach 1:
The patent changes key coating parameters including reducing coating thickness to 20 μm or less while simultaneously adjusting application speed, coating head positioning, and material flow rate. These coordinated parameter changes enable precise thin film coating with uniformity and accuracy that conventional methods cannot achieve at such reduced thicknesses.
Solution Approach 2:
The patent replaces conventional mechanical coating control systems with a more advanced control mechanism that incorporates sensors and automated adjustment systems. This substitution enables precise control of thin film coating processes, maintaining uniformity and accuracy even at reduced thicknesses of 20 μm or less.
3Productivity
If substrate width is increased for high productivity applications, then production capacity improves, but coating uniformity and straight-line formation become difficult to maintain
Solution Approach 1:
The patent divides the coating application process into multiple independently controllable zones or sections along the substrate width. Each zone can be adjusted separately to maintain uniform coating and straight-line formation across wide substrates, enabling high productivity while preserving manufacturing precision through segmented control.
Solution Approach 2:
The patent introduces additional control dimensions such as lateral positioning adjustment and multi-point sensing across the substrate width. By adding these dimensional control capabilities, the system can maintain coating linearity and uniformity on wide substrates while preserving high productivity through comprehensive spatial control.
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 approach enables the formation of thin films with a thickness of 20 μm or less, ensuring high productivity and accurate, linear trailing edges, suitable for battery electrode plates and other applications requiring precise coating.
Implementation Method 1
an application roller which carries a coating agent is brought into contact with the substrate halfway between the reference roller and the actuation roller so that the coating agent is transferred and deposited onto the surface of the substrate to thereby deposit and form a coating of thin film
Data Source
AI summary
A method for intermittently applying thin-film coatings is realized, by which a coating of extremely thin film reduced to 20 μm or less in thickness is deposited intermittently with high productivity and at the same time, the trailing coating edge of the thin film is formed in a highly accurate shape having good linearity. This is achieved as follows. A band-shaped substrate (1) traveling in one direction is kept looped over a stationary reference-roller (4) and a movable actuation roller (7), and is brought into contact with an application roller (19) which carries a coating agent (18) on its circumferential surface and rotates in a direction opposite to the direction of travel of the substrate (1). The actuation roller (7) is moved to come into or out of contact with the substrate (1) with a predetermined timing. A tension roller (8) is also controllably moved to come into or out of contact with the substrate (1), following the actuation roller (7) coming into or out of contact with the substrate (1), so that the tension applied to the substrate (1) is kept constant all the time.