Inkjet Printing Apparatus Test Pattern Aggregation Detection
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Solution Overview
Problem
Existing ink jet printing methods face challenges in detecting the degree of aggregation reaction between the reaction liquid and solid content in the ink, leading to insufficient aggregation and difficulty in removing the coloring material from porous bodies, which affects image formation and the reuse of these bodies.
Innovation Solution
A printing apparatus with an ink application unit, a reaction liquid application unit, and a liquid absorbing unit that forms a layer on a discharge medium, allowing for the detection of the reaction degree by applying a test pattern using a second ink different from the first ink, enabling control of the ink and reaction liquid application to ensure proper aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the application amount of the reaction liquid is insufficient or the reaction does not sufficiently proceed, then the coloring material aggregates insufficiently, but the coloring material enters the inside of the porous body together with the solvent, closing pores and reducing liquid removal capability
Solution Approach 1:
The patent applies a test ink containing solid content before the reaction liquid to create a preliminary test pattern. This allows detection of the reaction liquid's aggregation effect before actual printing, enabling adjustment of reaction liquid application amount or reaction conditions to ensure sufficient aggregation while preventing pore closure
Solution Approach 2:
The patent implements a feedback mechanism where the degree of aggregation reaction is detected by analyzing the test pattern formed by the test ink and reaction liquid. Based on this detection result, the system adjusts subsequent printing parameters to maintain optimal aggregation while preventing harmful effects on the porous body
2Manufacturing precision
If the degree of aggregation reaction is detected to avoid insufficient aggregation, then printing quality improves, but it has been difficult to measure the reaction liquid itself to correctly detect the reaction degree
Solution Approach 1:
The patent uses test ink containing solid content as an intermediary substance to indirectly measure the reaction liquid's aggregation capability. The test ink reacts with the reaction liquid to form a visible test pattern, allowing the aggregation degree to be detected through optical measurement of the test pattern rather than directly measuring the reaction liquid itself
Solution Approach 2:
The patent utilizes color changes in the test pattern formed by the reaction between test ink and reaction liquid to indicate the degree of aggregation reaction. By measuring the color intensity or distribution of the test pattern, the system can quantify the reaction degree and adjust parameters accordingly
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
Enables accurate detection of the aggregation reaction, preventing solid content from entering the porous body and maintaining the liquid removal capability, ensuring effective image formation and prolonged usability of the porous body.
Implementation Method 1
a liquid absorbing unit for bringing a liquid absorbing member of a porous body into contact with an ink image formed by the ink and the reaction liquid on the discharge medium to absorb liquid to thereby reduce the amount of the liquid in the ink image
Implementation Method 2
a reaction liquid application unit applying a reaction liquid reacting with a component in the ink to aggregate the solid content in the first ink onto the discharge medium
Data Source
AI summary
A printing apparatus having an ink application unit applying a first ink containing at least resin as a solid content onto a discharge medium, a reaction liquid application unit applying a reaction liquid reacting with a component in the ink to aggregate the solid content in the first ink onto the discharge medium, and a liquid absorbing unit for bringing a liquid absorbing member of a porous body into contact with an ink image formed by the ink and the reaction liquid on the discharge medium to absorb liquid to thereby reduce the amount of the liquid in the ink image, in which a layer is formed with the first ink and the reaction liquid on the discharge medium, and then a test pattern utilized for detection is printed by applying a second ink different from the first ink to a part of the layer by the ink application unit.