Gravure Offset Printing Blanket Reverse Motion Ink Transfer
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Solution Overview
Problem
Conventional gravure offset printing faces challenges in producing broad-area and fine-lining products due to the curvature limitations of large printing rollers, which result in insufficient ink pickup and poor printing quality, especially for line widths below 3 μm, limiting the effective printing area and yield.
Innovation Solution
A gravure offset printing apparatus featuring two clamps, a small printing roller, and a driving device that allows the blanket to undergo reverse motions, increasing the dipping depth and enabling better ink adhesion from a smaller roller, combined with a gravure module for efficient ink transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large printing roller is used for broad-area printing, then the printing area is increased, but the curvature limitation causes the contact area to become flat, reducing dipping depth and ink pickup
Solution Approach 1:
The patent divides the printing system into separate functional modules: a small printing roller for precise ink pickup and a large blanket for broad-area transfer. This segmentation allows each component to optimize its specific function without compromising the other, resolving the contradiction between printing area and line width uniformity.
Solution Approach 2:
The blanket acts as an intermediary between the small printing roller and the substrate. It receives ink from the small roller with high precision and then transfers it over a broad area, mediating between the conflicting requirements of small contact area for precision and large area for coverage.
2Manufacturing precision
If a small printing roller is used to maintain curvature and dipping depth, then ink pickup is improved, but the printing area is limited
Solution Approach 1:
The printing function is segmented into two stages: ink pickup by a small roller and area transfer by a large blanket. This allows the system to achieve both high precision line widths and broad printing area, as each component is optimized for its specific stage.
Solution Approach 2:
The patent transitions from a single-roller system to a two-component system that operates in different dimensional spaces. The small roller provides precise vertical contact for ink pickup, while the large blanket provides horizontal area coverage, effectively resolving the area limitation of a single small roller.
3Quantity of substance
If the blanket is clamped tightly to increase contact area, then ink adhesion is improved, but the curvature of the blanket is reduced, affecting fine-lining printing
Solution Approach 1:
The patent applies different quality characteristics to different parts of the blanket system. The portion of the blanket contacting the small printing roller is kept curved to maintain proper contact geometry for ink pickup, while the overall blanket structure is designed to accommodate broad-area printing. This local differentiation resolves the contradiction between curvature and contact area.
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 solution enhances the uniformity and quality of fine line widths, improving the yield of offset printing by increasing the dipping depth and allowing for broader-area printing without the limitations of large rollers, resulting in superior line width and density uniformity, from 50 nm to 50 μm.
Implementation Method 1
a surface of the blanket contacts the gravure module so as to adhere the offset ink on the surface of the blanket
Data Source
AI summary
A gravure offset printing apparatus includes two clamps, a printing roller and a driving device. The two clamps are applicable to clamp individually two opposing ends of a blanket. The printing roller having an axial direction parallel to a first direction is disposed between the two clamps. The blanket wraps part of a radial periphery of the printing roller. The driving device is to drive the two clamps to undergo reverse motions so as to displace the blanket, and the blanket further rotates the printing roller. A gravure module, disposed on a platform of the gravure offset printing apparatus, has a groove for containing an offset ink. While the two clamps pull the blanket to undergo the reverse motions, a surface of the blanket contacts the gravure module so as to adhere the offset ink on the surface of the blanket.