Inkjet Printing Gloss Control via Dynamic Ejection Order
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Solution Overview
Problem
Conventional ink-jet printing technologies face issues with gloss unevenness and increased processing liquid consumption, particularly when adjusting glossiness, as they either fail to sufficiently improve gloss uniformity at low printing duties or increase processing liquid usage.
Innovation Solution
A data generating apparatus and method that control the ejection order of ink and processing liquid based on printing duty, where the processing liquid is ejected before the ink at low printing duties and after at higher duties, to minimize gloss unevenness while optimizing processing liquid usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If processing liquid is ejected before ink at low printing duty, then gloss unevenness is reduced, but processing liquid consumption increases
Solution Approach 1:
The patent applies dynamics by making the ejection order of processing liquid and ink variable rather than fixed. The control unit dynamically adjusts the ejection sequence based on the printing duty value: when printing duty is below the threshold, processing liquid is ejected before ink; when printing duty is above the threshold, ink is ejected before processing liquid. This dynamic adaptation allows the system to optimize both gloss uniformity and processing liquid consumption for different printing conditions.
2Quantity of substance
If processing liquid is ejected after ink at high printing duty, then processing liquid consumption is reduced, but gloss unevenness increases
Solution Approach 1:
The patent applies dynamics by making the ejection order of processing liquid and ink variable rather than fixed. The control unit dynamically adjusts the ejection sequence based on the printing duty value: when printing duty is below the threshold, processing liquid is ejected before ink; when printing duty is above the threshold, ink is ejected before processing liquid. This dynamic adaptation allows the system to optimize both gloss uniformity and processing liquid consumption for different printing conditions.
3Manufacturing precision
If clear ink is applied to ensure constant resin amount per unit area, then gloss unevenness is reduced, but clear ink consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the ejection order parameter based on printing duty conditions rather than adjusting the amount of processing liquid. The system changes the sequence parameter (which substance is ejected first) according to the printing duty value, achieving optimal gloss uniformity without increasing processing liquid consumption. This parameter-based control resolves the contradiction between gloss uniformity and consumption.
Data Source
AI summary
Processing liquid is ejected by a scan which is as prior as possible to the ink if it is determined that the printing duty of the ink is relatively low. Furthermore, the processing liquid is ejected by a scan which is as posterior as possible to the ink if it is determined that the printing duty of the ink is relatively high. Accordingly, the change of the glossiness can be suppressed regardless of the change of the printing duty of the ink. At the same time, it becomes possible to adjust the glossiness with a minimum necessary amount of processing liquid since the glossiness is adjusted not by varying the amount of the processing liquid depending on the printing duty of the ink, but by varying the printing order.