Rotary Screen Ink Supply Restricting Plate
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Solution Overview
Problem
Conventional rotary screen apparatuses experience ink splashing and air inclusion at high speeds, leading to uneven ink distribution and bubbling, which deteriorates printing quality.
Innovation Solution
A liquid supply apparatus with a restricting plate that limits ink movement, keeping it within the space between the squeegee and the plate, reducing air inclusion and bubbling, and ensuring even ink distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotary screen is rotated at high speeds to perform high speed screen printing, then productivity is improved, but the ink intensively collides with the squeegee and splashes back causing air inclusion and bubbling which deteriorates manufacturing precision
Solution Approach 1:
The internal space of the rotary screen is segmented into a liquid supply region and a liquid discharge region by the liquid movement restricting means. This segmentation prevents ink from overflowing from the discharge region back to the supply region, reducing air inclusion and bubbling even at high rotation speeds, thereby maintaining both productivity and printing quality
Solution Approach 2:
The liquid movement restricting means acts as an intermediary structure between the ink supply and discharge regions. It controls and directs ink flow, preventing harmful backflow and collision with the squeegee, thus reducing air entrapment while allowing high-speed operation to continue
2Productivity
If the ink is extruded through holes in the rotary screen at high speed, then productivity is improved, but the ink is likely to be uneven causing deterioration in printing quality
Solution Approach 1:
By dividing the rotary screen into distinct liquid supply and discharge regions, the invention ensures that ink flows in a controlled manner through the holes without turbulence or backflow. This maintains even ink distribution through the screen holes even at high extrusion speeds, preserving printing quality while achieving high productivity
Data Source
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AI summary
A rotary screen apparatus (100) includes: a hollow cylinder (121) having multiple holes formed therein and configured to come into contact, at its outer peripheral surface, with the surface of a sheet held on an impression cylinder (110); a rotary screen (120) including a squeegee (124) configured to extrude ink (1) delivered to the inner peripheral surface of the hollow cylinder (121) through the holes by coming into contact with the inner peripheral surface of the hollow cylinder (121); and a restricting plate (127), disposed on the downstream side of the squeegee (124) in the moving direction thereof in relative movement of the hollow cylinder (121) and the squeegee (124) performed when the ink (1) is extruded through the holes in the hollow cylinder (121), for restricting movement of the ink (1) such that the ink (1) is kept within a space (121a) present on a downstream side of the portion of the squeegee (124) in contact with the hollow cylinder (121) in the moving direction.