Printing method and printing device
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Solution Overview
Problem
The challenge in printing on transfer media, such as cloth, is that white ink applied after colored ink may not be fully dried, leading to potential dripping and image bleeding when the transfer sheet is tilted during adhesive application, which can result in poor image quality.
Innovation Solution
A printing method and device that involves forming an image with colored ink and then overlaying undercoat ink, with a controlled ejection amount, to suppress the flow of undercoat ink due to tilting, thereby preventing bleeding by adjusting the ejection amount based on the region where adhesive is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the transfer sheet is tilted to apply adhesive, then adhesive application is facilitated, but white ink may drip downward causing image bleeding
Solution Approach 1:
The patent applies preliminary action by forming an undercoat layer of white ink before the colored image, and by strategically controlling the ejection timing and amount of undercoat ink in different regions. This preparatory undercoat structure prevents bleeding during subsequent adhesive application without requiring complex real-time adjustments during the tilting process.
Solution Approach 2:
The patent implements local quality by dividing the printing area into multiple regions with different undercoat ink ejection amounts. Regions that will be tilted downward receive less undercoat ink, while other regions receive normal or greater amounts. This spatially varying ink distribution prevents bleeding in critical areas while maintaining image quality elsewhere.
2Manufacturing precision
If white ink is overlaid on colored ink, then image completeness is improved, but drying time increases causing potential dripping
Solution Approach 1:
The undercoat layer is applied in advance before the colored image, creating a foundation that reduces the need for excessive white ink overlay. This preliminary structure allows the colored ink to bond more effectively without requiring thick white ink layers that would extend drying time.
Solution Approach 2:
By varying the undercoat ink ejection amount across different regions, the patent optimizes the balance between image completeness and drying time. Regions requiring less white ink for completeness have reduced undercoat amounts, thereby reducing drying time and bleeding risk in those specific areas.
3Manufacturing precision
If undercoat ink ejection amount is increased, then image coverage is improved, but ink flow and bleeding increase
Solution Approach 1:
The patent applies local quality by implementing region-specific undercoat ink ejection amounts. Instead of uniformly increasing ink coverage across the entire image, the system selectively increases undercoat ink only in regions where it is needed for proper color representation, while reducing or maintaining normal amounts in regions prone to bleeding during tilting.
Solution Approach 2:
The patent changes the parameter of undercoat ink ejection amount dynamically across different spatial regions. By adjusting this parameter locally rather than globally, the system achieves optimal image coverage in each region while preventing excessive ink flow and bleeding in tilt-prone areas.
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 method effectively suppresses image bleeding and enhances image quality by reducing the undercoat ink ejection amount in regions where it is applied later, ensuring better adherence and transfer to the target medium.
Implementation Method 1
an image forming step that forms the image on the transfer medium by ejecting colored ink from a first inkjet head; and an undercoat forming step in which the undercoat ink is overlaid on the image on the transfer medium by ejecting the undercoat ink from a second inkjet head
Implementation Method 2
a step for printing first image data on a transfer sheet using black toner and color toner, a step for generating second image data by processing all colors in the print region of the first image data into black, a step for printing the second image data on the transfer sheet on which the first image data has been printed using white toner instead of black toner
Data Source
AI summary
A printing method includes an image forming step that forms an image on a transfer medium by ejecting colored ink from a first inkjet head, and an undercoat forming step in which undercoat ink is overlaid on the image on the transfer medium by ejecting undercoat ink from a second inkjet head, wherein assuming that a region where an adhesive is applied to the transfer medium at the same timing in an adhesive application step is a process unit region, the process unit region includes a first region and a second region where the undercoat ink is overlaid on the image after the first region, and in the undercoat forming step, an ejection amount of the undercoat ink per unit area to the second region is less than an ejection amount of the undercoat ink per unit area to the first region.