Ink Jet Printing Apparatus Ink Permeation Control
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Solution Overview
Problem
Ink jet printing systems face challenges in maintaining optical density and image quality due to ink bleeding and uneven permeation rates, particularly when using high- and low-permeation inks in alternating patterns without specifying the order of ejection, leading to potential density issues and image degradation.
Innovation Solution
The system employs a controlled sequence of ejecting low-permeation ink followed by high-permeation ink for the non-edge area and low-permeation ink for the edge area, ensuring that low-permeation ink is printed first to maintain surface retention and then blended with high-permeation ink, enhancing optical density and preventing bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-permeation ink is ejected first followed by low-permeation ink, then printing speed and drying time are improved, but optical density decreases and image quality degrades
Solution Approach 1:
The patent applies preliminary action by ejecting low-permeation ink first to establish a base layer that retains pigment on the surface, then subsequently ejecting high-permeation ink to enhance permeation. This sequential approach ensures that the pigment is already in position before permeation occurs, preventing density loss while maintaining printing speed benefits
2Loss of time
If high-permeation ink is used for printing, then drying time is reduced and printing speed is increased, but ink bleeding occurs and image quality degrades
Solution Approach 1:
The patent applies local quality by using different ink types in different spatial locations and sequences: low-permeation ink is used first to establish boundaries and prevent bleeding, while high-permeation ink is used subsequently in controlled areas to enhance permeation where needed, achieving both fast drying and bleeding prevention
3Manufacturing precision
If low-permeation ink is used for printing, then ink bleeding is reduced and image quality is maintained, but printing speed decreases and drying time increases
Solution Approach 1:
The patent merges the advantages of both low-permeation and high-permeation inks by combining them in a specific sequence: low-permeation ink provides bleeding prevention and quality maintenance, while high-permeation ink contributes fast drying and speed improvement. The combination achieves both image quality and printing speed benefits simultaneously
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 prevents optical density reduction, reduces image degradation, and improves rub resistance and bleed fastness by ensuring low-permeation ink is retained on the surface, while high-permeation ink enhances permeation without causing excessive ink raising or bleeding.
Implementation Method 1
ink having a relatively low permeation rate (ink that relatively slowly permeates a print medium; hereinafter referred to as low-permeation ink) is employed to form dots
Implementation Method 2
ink having a relatively high permeation rate (ink that relatively rapidly permeates a print medium; hereinafter referred to as high-permeation ink) and the low-permeation ink are employed for form dots
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
An ink jet printing apparatus and an ink jet printing method, whereby high-permeation ink and low-permeation ink are employed to prevent a reduction in optical density is provided. The ink jet printing apparatus controls ejection of ink from print heads (201 to 206), so that only low-permeation ink is ejected onto the edge area (2013) of a print medium that is adjacent to a non-printing area, and this time, high-permeation ink is not employed. Further, the ink jet printing apparatus controls ejection of ink from the print heads (201 to 206), so that both low-permeation ink and high-permeation ink are employed for the non-edge area (2003) that is adjacent to the edge area (2013), and to perform printing, the low-permeation ink is ejected onto the non-edge area (2003) prior to the high-permeation ink.