Precoating Liquid Control for Ink Adhesiveness
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Solution Overview
Problem
Inkjet image forming apparatuses face challenges in achieving consistent adhesiveness between printing base materials and ink, particularly due to varying surface tensions of the materials, which affect abrasion resistance and line width reproducibility.
Innovation Solution
An image forming apparatus with an ink head unit and a precoating liquid head unit, where the control part determines the application of precoating liquid based on the surface tension of the printing base material, ejecting a predetermined amount when the tension is below 38 mN/m to enhance adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precoating liquid is applied to enhance adhesiveness, then adhesiveness between printing base material and ink is improved, but device complexity increases due to additional precoating head unit and control logic
Solution Approach 1:
The precoating liquid is applied to the printing base material before ink ejection to modify the surface properties. This preliminary action enhances the adhesiveness between the printing base material and subsequent ink layers, ensuring better image quality and abrasion resistance without requiring complex real-time adjustments during the printing process
Solution Approach 2:
The system controls the application of precoating liquid based on detected surface tension parameters of the printing base material. By adjusting whether precoating is applied according to surface tension thresholds, the system optimizes adhesiveness while managing device complexity through intelligent parameter-based decision making
2Strength
If precoating liquid is applied to improve abrasion resistance, then abrasion resistance of the printed material is enhanced, but manufacturing precision may deteriorate due to potential variability in precoating application
Solution Approach 1:
The control part determines whether to apply precoating liquid based on the surface tension parameter of the printing base material. By using surface tension detection to gate the precoating process, the system ensures consistent and reproducible results across different material batches, preventing variability that would otherwise affect line width precision
Solution Approach 2:
The system incorporates surface tension detection as a feedback mechanism to determine precoating application. This feedback loop ensures that precoating is applied only when necessary (when surface tension is below threshold), maintaining consistent image quality and line width reproducibility while achieving the desired abrasion resistance
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 solution ensures improved adhesiveness and line width reproducibility by controlling precoating liquid application, resulting in uniform ink droplet distribution and enhanced abrasion resistance on materials with low surface tension.
Implementation Method 1
When a surface tension of the recording base material is smaller than a predetermined value, the control part controls the precoating liquid head unit to eject a predetermined amount of the precoating liquid
Data Source
AI summary
An image forming apparatus includes an ink head unit, a precoating head unit, and a control part. The ink head unit ejects ink to a printing base material conveyed along a predetermined conveying direction. The precoating liquid head unit is disposed on an upstream side of the ink head unit in the conveying direction and ejects precoating liquid to the printing base material. The control part controls the precoating liquid head unit so as to eject the precoating liquid. When a surface tension of the recording base material is smaller than a predetermined value, the control part controls the precoating liquid head unit to eject a predetermined amount of the precoating liquid.