Printing Medium Surface Treatment via Test Liquid Feedback
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Solution Overview
Problem
Existing methods for surface treatment of plastic films to enhance adhesion of water-soluble inks are inefficient, often requiring additional process steps and time due to the need for mediating layers or treatments that do not adapt well to varying printing parameters and media properties.
Innovation Solution
A method involving physical and/or chemical treatment of the printing medium surface, where test liquids are applied and their behavior is detected to adjust the surface tension or energy, allowing for real-time adaptation of the treatment to achieve optimal adhesion for specific printing fluids and media, potentially eliminating the need for additional coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primer with increased polarity is applied to the plastic film before printing, then adhesion of water-soluble ink is improved, but process time and cost increase due to additional coating and drying steps
Solution Approach 1:
The invention extracts and eliminates the primer coating step from the printing process. Instead of applying a separate primer layer, the method directly treats the plastic film surface with plasma or corona discharge to modify its surface energy, thereby achieving ink adhesion without the time-consuming coating and drying steps
Solution Approach 2:
The invention performs preliminary surface treatment of the plastic film before printing by applying plasma or corona discharge. This pre-treatment modifies the surface energy of the film in advance, creating optimal conditions for ink adhesion without requiring subsequent primer application or drying time
2Reliability
If a primer with increased polarity is applied to the plastic film before printing, then adhesion of water-soluble ink is improved, but process complexity and cost increase
Solution Approach 1:
The invention removes the primer application equipment and drying system from the printing process, replacing them with a plasma or corona treatment unit that directly modifies the film surface. This extraction simplifies the overall system while maintaining ink adhesion
Solution Approach 2:
The invention changes the surface energy parameters of the plastic film through plasma or corona treatment. By adjusting treatment parameters such as power, duration, and gas flow, the surface energy is optimized for ink adhesion without requiring additional coating materials or complex multi-step processes
3Reliability
If standard plasma or corona treatment is applied to increase surface polarity, then ink adhesion is improved, but the treatment cannot be adapted to varying printing parameters and media properties
Solution Approach 1:
The invention implements a feedback control system that measures the contact angle of a test liquid on the treated surface and uses this information to adjust plasma or corona treatment parameters. This closed-loop control enables real-time adaptation to varying printing conditions, film materials, and ink properties, ensuring optimal ink adhesion across different scenarios
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 targeted surface treatment, improving print quality by adjusting surface properties to match printing conditions, reducing process time and costs by eliminating the need for separate coating steps and allowing for automatic adjustment based on detected parameters.
Implementation Method 1
adjusting a surface tension or surface energy of the printing medium; applying a plurality of samples of a test liquid to the physically and/or chemically treated surface
Implementation Method 2
detecting a behavior of the test liquid on the physically and/or chemically treated surface, wherein the behavior of the test liquid comprises a contact behavior and/or a flow behavior
Data Source
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AI summary
A method for treating the surface of a printing medium comprises physically and/or chemically treating a surface of the printing medium, applying at least one sample of a test liquid to the physically and/or chemically treated surface of the printing medium, detecting a behavior of the test liquid on the physically and/or chemically treated surface, and adapting the physical and/or chemical treatment of the surface of the printing medium according to the detected behavior.