Inkjet Roll Coating for Ultrathin Film Uniformity
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Solution Overview
Problem
Traditional gravure coating methods face challenges in achieving precise control over coating thickness and uniformity, especially for ultrathin coatings, due to limitations in roll engraving precision and the need for doctor blades, which can introduce variability and require roll changes.
Innovation Solution
A method and system that utilize a receiving roll with a controlled liquid pattern applied by an inkjet printer, allowing for precise control of coating volume and thickness on a web surface without the need for precision-engraved rolls or doctor blades, enabling the formation of substantially continuous coatings with improved uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional gravure coating methods are used with precision-engraved rolls and doctor blades, then coating thickness control is achieved, but manufacturing complexity and variability increase
Solution Approach 1:
The patent replaces the mechanical gravure roll engraving system with a digital inkjet printing system. Instead of using precision-engraved rolls with microscopic cells, the invention uses digital imaging to directly deposit coating material onto the substrate. This substitution eliminates the need for complex mechanical engraving while achieving precise coating thickness control through digital parameter adjustment.
Solution Approach 2:
The invention changes the control parameter from physical roll engraving geometry to digital printing parameters. By controlling the digital image data, drop size, and deposition density, the system achieves precise coating thickness control without requiring precision mechanical engraving. The coating thickness is adjusted by modifying digital parameters rather than physical roll features.
2Manufacturing precision
If doctor blades are used to remove excess ink from gravure rolls, then coating uniformity is improved, but the system requires roll changes and introduces variability
Solution Approach 1:
The patent eliminates the doctor blade mechanical scraping system and replaces it with a digital deposition approach. Instead of applying excess material and removing it mechanically, the system deposits only the required amount of coating material through digital control. This eliminates the variability introduced by doctor blade contact and roll wear, improving coating consistency and reliability.
3Manufacturing precision
If precision-engraved rolls are used for ultrathin coating, then coating thickness control is achieved, but the ability to dynamically adjust thickness is limited
Solution Approach 1:
The patent introduces dynamic adjustability by replacing static roll engraving with a digital printing system. The coating thickness can be dynamically adjusted by changing digital image parameters, drop size, or deposition density without requiring physical roll changes. This enables real-time adaptation to different coating requirements while maintaining ultrathin coating precision.
Solution Approach 2:
The invention enables continuous parameter adjustment by controlling digital printing variables such as drop volume, drop spacing, and deposition rate. This allows the system to adapt coating thickness dynamically for different applications, from ultrathin to thicker coatings, without requiring different physical rolls or engraving configurations.
4Quantity of substance
If traditional gravure rolls with cell engravings are used, then coating volume is controlled by cell specifications, but local variability in engravings impacts uniformity
Solution Approach 1:
The patent replaces the mechanical gravure roll cell system with a digital imaging and direct deposition system. Instead of relying on uniformity of mechanically engraved cells, the system uses digital control to ensure uniform material distribution. The digital image data precisely controls where and how much material is deposited, eliminating variability inherent in mechanical engraving processes.
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 allows for dynamic adjustment of coating thickness and uniformity, eliminating the need for roll changes and improving coating quality, particularly for ultrathin coatings where traditional methods struggle with uniformity and precision.
Implementation Method 1
applying a liquid material onto a receiving roll to form a liquid pattern
Implementation Method 2
transferring at least a portion of the liquid material in the liquid pattern from the receiving roll onto a major surface of a web to form a substantially continuous coating
Data Source
AI summary
Methods and systems of roll coating are provided. An applicator applies a liquid material onto a receiving roll to form a liquid pattern, which is then directly or indirectly transferred onto a substrate surface under an impression force to form a continuous coating on the substrate surface.