Post-processing Liquid Application Device Coverage Rate Control
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Solution Overview
Problem
The application of post-processing liquid only on printed portions of a print medium leads to degraded abrasion resistance due to uneven friction coefficients, necessitating increased liquid application to maintain equivalent abrasion resistance as full-page application, which can result in higher costs and poor drying issues.
Innovation Solution
A post-processing liquid application device with an ejecting head that selects specific ejection patterns based on coverage rates, applying the liquid either partially on printed areas or over the entire surface, optimizing liquid usage and preventing abrasion resistance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If post-processing liquid is applied only on printed portions, then the amount of liquid used is reduced and drying is promoted, but abrasion resistance is degraded due to uneven friction coefficients
Solution Approach 1:
The patent applies post-processing liquid selectively to specific regions (printed portions or surrounding areas) rather than uniformly across the entire print medium. This local application strategy reduces overall liquid consumption while maintaining protective functionality where most needed, directly addressing the contradiction between reducing liquid quantity and maintaining abrasion resistance.
Solution Approach 2:
The patent segments the print medium into different regions (printed portions, surrounding portions, and non-printed areas) and applies post-processing liquid to specific segments based on coverage rate thresholds. This segmentation allows optimized liquid distribution that balances cost reduction with abrasion resistance maintenance.
2Reliability
If the amount of post-processing liquid per unit area is increased to maintain abrasion resistance, then abrasion resistance is improved, but cost per page increases and drying performance deteriorates
Solution Approach 1:
The patent changes the application parameters (coverage rate thresholds, ejection patterns) based on image characteristics. By dynamically adjusting liquid application strategy according to calculated coverage rates, the system maintains effective abrasion protection while optimizing liquid usage to reduce cost per page and improve drying performance.
3Productivity
If post-processing liquid is applied only on printed portions, then liquid usage is reduced, but friction coefficient becomes uneven causing degraded abrasion resistance
Solution Approach 1:
The patent applies post-processing liquid selectively to specific regions (printed portions or surrounding areas) rather than uniformly across the entire print medium. This local application strategy reduces overall liquid consumption while maintaining protective functionality where most needed, directly addressing the contradiction between reducing liquid quantity and maintaining abrasion resistance.
Solution Approach 2:
The patent dynamically adjusts the ejection pattern based on calculated coverage rates. When coverage rate is low, it applies liquid to printed portions and surrounding areas; when coverage rate is high, it applies liquid only to printed portions. This dynamic adaptation optimizes both drying speed and abrasion resistance based on actual image characteristics.
Data Source
AI summary
A post-processing liquid application device includes an ejecting head that ejects a post-processing liquid in a specific ejection pattern on a recording medium after ink has been attached thereto to form a character and/or an image based on image information, and a control unit that selects the specific ejection pattern based on a coverage rate calculated from the image information. When the coverage rate is low, the control unit selects a first ejection pattern for ejecting the post-processing liquid on a printed portion of a print region of the recording medium or ejecting the post-processing liquid on the printed portion and a surrounding portion thereof. When the coverage rate is high, the control unit selects a second ejection pattern for ejecting the post-processing liquid over the entire surface of the print region of the recording medium.