Reverse Offset Printing with Segmented Cliche for Minute Pattern Transfer
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Solution Overview
Problem
In reverse offset printing, minute patterns are difficult to transfer accurately due to the weak adhesive force between the blanket and functional ink, causing the ink to be transferred to the cliché instead of remaining on the blanket, leading to inaccurate printing.
Innovation Solution
A reverse offset printing method where a blanket coated with functional ink is contacted by multiple clichés, each designed to remove specific shear regions of the ink, allowing for precise separation and transfer of the pattern to a substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single cliche is used to remove unnecessary pattern, then the device complexity is low, but the manufacturing precision deteriorates because the adhesive force between blanket and functional ink is weaker than shear force, causing ink to transfer to cliche instead of remaining on blanket
Solution Approach 1:
The patent divides a single cliche into multiple separate cliches (first cliche and second cliche), each responsible for removing specific shear regions. This segmentation allows precise control over which ink regions are removed and which remain on the blanket, thereby improving pattern transfer accuracy while managing device complexity through modular design
Solution Approach 2:
Each cliche is designed with specific contact portions and groove portions tailored to its function. The first cliche has contact portions for one shear region with corresponding grooves, while the second cliche has contact portions for another shear region. This local customization ensures that each cliche optimally removes only its designated unnecessary pattern region without affecting other areas
2Reliability
If the blanket and cliche are separated to transfer pattern, then the printing process is simple, but the reliability deteriorates because the functional ink that should remain on blanket is transferred to cliche due to insufficient adhesive force
Solution Approach 1:
By segmenting the cliche into multiple specialized cliches, each with specific contact and groove portions, the system reliably controls ink transfer at each separation step. The first cliche removes ink from one shear region while the second cliche removes ink from another shear region, ensuring that only the desired pattern remains on the blanket with high reliability
Solution Approach 2:
The groove portions in each cliche act as intermediaries that temporarily hold the functional ink during the separation process. The grooves are positioned to receive and retain the desired pattern portion while the contact portions remove unnecessary ink, ensuring reliable pattern transfer to the substrate without premature ink loss
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 method enables accurate and precise minute printing by ensuring the pattern remains on the blanket and is correctly transferred to the substrate, even for patterns with widths equal to or smaller than scores of micrometers.
Implementation Method 1
adhesive force between the blanket B and the functional ink is weaker than shear force of the function ink
Implementation Method 2
adhesive force between the blanket B and the functional ink is weaker than shear force of the function ink
Data Source
AI summary
The present invention relates to a reverse offset printing method, and more particularly, to a reverse offset printing method in a partial off type capable of accurately transferring a pattern to a cliche to achieve more precise minute printing by separately performing removal for each shear region of a functional ink even though the pattern is minute.