Beaded Partially Coated Anti-Marking Jackets for Printing Presses
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Solution Overview
Problem
Conventional transfer cylinders in rotary offset printing presses cause smearing and marking of freshly printed substrates due to ink accumulation and lack of cushioning, despite attempts to minimize contact area and use ink-repellent coatings like PTFE.
Innovation Solution
A removable flexible jacket with a beaded surface layer and graphic markings is used on transfer cylinders, allowing for targeted cleaning of ink build-ups by visually matching marks on substrates to numbered areas, reducing the need to clean the entire surface and minimizing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PTFE coating is applied to transfer cylinder surface, then ink repellent properties are improved, but cleaning frequency increases and cushioning effect is lost
Solution Approach 1:
The patent combines PTFE coating with a fabric covering to create a composite structure that provides both ink repellent properties and cushioning effect. The fabric layer absorbs ink accumulation while the PTFE coating prevents ink adhesion, resolving the contradiction between ink repellency and cleaning frequency.
Solution Approach 2:
The fabric covering is applied specifically to the transfer cylinder surface where ink contact occurs, providing localized cushioning and ink absorption properties while maintaining the overall ink repellent function of the PTFE coating.
2Reliability
If fabric covering is added over PTFE coated surface, then cushioning effect is improved, but device complexity increases
Solution Approach 1:
A thin fabric covering is applied over the PTFE coated transfer cylinder surface. This flexible thin film provides the necessary cushioning effect and ink absorption capability without significantly increasing the overall device complexity or bulk.
3Reliability
If entire jacket surface is cleaned frequently, then ink accumulation is reduced, but printing downtime increases
Solution Approach 1:
The jacket surface is divided into multiple numbered zones that can be individually identified and cleaned. This segmentation allows operators to clean only the specific contaminated areas rather than the entire surface, reducing cleaning time and printing downtime while maintaining effective ink accumulation control.
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
The flexible jacket effectively reduces substrate marking and smearing by allowing focused cleaning of specific areas, maintaining printing efficiency and reducing solvent usage, while the graphic markings facilitate quick identification of dirty zones for efficient maintenance.
Implementation Method 1
The flexible jacket effectively reduces substrate marking and smearing
Implementation Method 2
a coating partially covering the beads, wherein a cusp of at least some of the larger beads is substantially free of the coating
Data Source
AI summary
A removable flexible jacket for use in a printing press having a transfer cylinder for transferring a freshly printed substrate comprises a sheet of woven fabric, a beaded film sheet coupled to the sheet of woven fabric, and an image disposed between the sheet of woven fabric and the beaded film sheet. The image is visible through the beaded film sheet, and wherein the image divides at least a portion of a surface of the beaded film sheet into a plurality of zones.