Deflection Shield for Rotary Printing Press Ink Roller
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In waterless offset printing, high-viscosity inks used in rotary printing machines often result in significant color density differences due to vortex formation at the ink outlet, leading to undesirable print quality.
Innovation Solution
A deflection device, comprising a deflection shield positioned between the ink inlet and outlet, forces the ink to flow past the roller surface before exiting, reducing axial color density variations by redirecting the ink flow between the shield and the roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ink is supplied to the doctor blade by pumps at both ends with drainage in the center, then the ink chamber can be supplied with printing ink, but vortices form at the outlet causing significant color density differences in the printed product
Solution Approach 1:
The deflection device is positioned upstream in the ink flow path to redirect ink before it reaches the drainage outlet. By preliminarily changing the flow direction, the system prevents vortex formation at the outlet, thereby maintaining color density uniformity while ensuring proper ink supply and drainage
Solution Approach 2:
The deflection device acts as an intermediary element between the ink supply system and the drainage outlet. It mediates the ink flow by redirecting it away from the outlet area, preventing the harmful vortex effect while maintaining the functionality of both ink supply and drainage
2Manufacturing precision
If a deflection device is added to redirect ink flow past the roller surface, then color density differences are reduced, but the device complexity increases
Solution Approach 1:
The deflection device utilizes a thin plate or shield structure that is simple in form but effective in function. This thin-film approach achieves flow redirection without requiring complex mechanical components, thereby minimizing the increase in device complexity while maintaining color density uniformity
Solution Approach 2:
The deflection device introduces a spatial dimension change by positioning a shield at a specific distance from the roller surface. This creates a three-dimensional flow path modification that effectively redirects ink without adding complex mechanical moving parts, maintaining structural simplicity
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 significantly reduces color density differences in the printed product, improving overall print quality in a structurally simple manner.
Implementation Method 1
a deflection device, spaced apart from the roller to be inked, in the form of a deflection shield, which forces the printing ink to flow between the deflection shield and the roller surface
Implementation Method 2
due to the suction effect of the outflowing medium, vortices and the like form in the area of the outlet
Data Source
Figure 1
Figure 2~4
Figure 5~8
AI summary
The equipment has a blade bar (2) engaged to a roller (1), where the blade bar has a printing ink chamber (4) open to the roller and running along the blade bar. A deflection device is arranged in the printing ink chamber between a printing ink inlet (6) and a printing ink outlet for deflecting the printing ink along a direction of the roller. The side of the deflection device facing the roller is spaced apart from the roller in an engaged state of the blade bar. The deflection device has two deflection plates that are arranged adjacently on both sides of the printing ink outlet.