Duplex Inkjet Printing Order for Consistent Paper Curl
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Solution Overview
Problem
Existing printing systems face issues with inconsistent curling of double-sided printed papers due to differing print duties on the front and rear surfaces, leading to potential inconsistencies in the drying process and curl states.
Innovation Solution
A printing system with a first and second printing machine, each equipped with a control section that determines the order of print data based on print duties to ensure consistent drying and curl states on both surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If double-sided printing is performed consecutively with mixed print duties on front and rear surfaces, then printing productivity is improved, but the drying degree and curl state become inconsistent across different paper sheets
Solution Approach 1:
The control section determines the print duty for each surface before printing begins, and based on this preliminary assessment, decides which surface to print first. This preliminary determination of printing order based on print duty values ensures that the surface with lower print duty (less ink, faster drying) is printed first, while the surface with higher print duty (more ink, slower drying) is printed second, thereby achieving consistent drying states and curl characteristics across all paper sheets while maintaining continuous double-sided printing operation
2Ease of operation
If printing order is determined arbitrarily without considering print duty, then device operation is simplified, but the drying process and curl state vary between paper sheets
Solution Approach 1:
The system automatically determines the optimal printing order by having the control section calculate and compare print duty values for the front and rear surfaces. The control section autonomously decides which surface to print first based on which has the lower print duty, eliminating the need for manual intervention or complex external control while ensuring consistent drying and curl characteristics across all printed paper sheets
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 system ensures consistent curling and drying of double-sided printed papers by optimizing the printing order based on print duties, enhancing the overall quality and consistency of the printed output.
Implementation Method 1
a first printing machine configured to print by ejecting liquid from a first printing section onto the front surface of a medium
Implementation Method 2
a second printing machine provided downstream of the first printing machine in the transport direction and configured to print by ejecting liquid from a second printing section onto the rear surface of the medium
Implementation Method 3
the drying degree of the printing with the higher print duty is different
Data Source
AI summary
A printing system includes a first printing section configured to print by ejecting ink from a first printing section onto the surface of a medium; a second printing section that is provided downstream of the first printing section in the transport direction of the medium and that is configured to print by ejecting ink onto the rear surface of the transported medium; and a control section, wherein when printing on both surfaces of the medium, the control section determines which of first print data and second print data is to be printed first at the first printing section and later at the second printing section, based on the print duties of the first print data to be printed on the first surfaces, which is one surface of the medium, and the second print data to be printed on the second surfaces, which is the other surface of the medium.