Cooling Roller Ink Repellent Medium Application
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Solution Overview
Problem
Existing cooling units in printing presses suffer from ink set-off on rollers, which impairs print quality as there are no effective methods to prevent the deposition of printing ink on cooling unit rollers.
Innovation Solution
A cooling unit with ink-repellent medium application devices on rollers to create a separating layer between the printing material and the cooling unit rollers, using methods such as spray systems, roller systems, or cloth systems to apply silicone oil or emulsions, preventing ink deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling unit rollers are used to cool printed material, then cooling function is achieved, but printing ink deposits on the rollers impairing print quality
Solution Approach 1:
An ink-repellent medium is introduced as an intermediary substance between the printing ink and the cooling unit roller surface. This medium forms a separating layer that prevents direct contact between the ink and the roller, thereby preventing ink deposition while allowing the roller to perform its cooling function. The medium acts as a protective barrier that mediates the interaction between the printed material and the cooling surface.
2Productivity
If cooling unit rollers directly contact printed material, then cooling efficiency is improved, but ink transfer to rollers occurs
Solution Approach 1:
The ink-repellent medium serves as a mediator that enables direct contact between the printed material and cooling roller while preventing harmful ink transfer. The medium is applied to the roller surface in such a way that it maintains continuous contact for efficient heat transfer but repels the printing ink, thus decoupling the cooling function from the ink deposition problem.
Solution Approach 2:
The surface properties of the cooling roller are changed by applying an ink-repellent medium. This changes the surface energy characteristics of the roller from ink-attracting to ink-repelling, while maintaining the thermal conductivity needed for effective cooling. The parameter change is localized to the surface properties without affecting the bulk cooling performance.
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
Effectively minimizes ink deposition on cooling unit rollers, thereby maintaining print quality by creating a barrier between the ink and the rollers.
Implementation Method 1
at least one cooling unit roller (12) is assigned a device (13) for applying an ink-repellent medium, which acts as a separating layer between the respective cooling unit roller (12) and the printing material (11) to be cooled
Data Source
Figure 1
AI summary
The cooling unit (10) has cooling unit rollers (12) to which a printing material (11) to be cooled is guided during transport by the cooling unit. An application device (13) is attached to the cooling unit rollers for applying a medium e.g. silicone oil or silicone emulsion, on a surface of the cooling unit rollers, where the medium acts as a separation layer between the cooling unit rollers and the printing material to be cooled. The medium turns printing ink down. A cloth system comprises cloth that is soaked with the silicone emulsion and silicone oil. Independent claims are also included for the following: (1) a method for cooling a printing material in a cooling unit (2) a printing press comprising a printing unit for printing a printing material.