Fluoroelastomer Roller Coating for Printing Press Ink Transfer
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Solution Overview
Problem
Rollers and rubber blankets with elastomeric coverings in printing presses face issues such as overemulsification of ink and damping solution, leading to unsharp contours and color deviations, and have limited long-term stability and back-transfer properties, resulting in suboptimal print quality and frequent maintenance needs.
Innovation Solution
A roller or rubber blanket with a continuous surface coating of fluoroelastomer, specifically elastomeric fluorinated rubber, providing a thin and smooth layer that maintains dynamic load-bearing capacity and prevents overemulsification, ensuring consistent ink and damping solution transfer and extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rollers with elastomeric covering are used for ink and damping solution transfer, then good mechanical properties and wear resistance are achieved, but overemulsification occurs leading to unsharp contours and color deviations
Solution Approach 1:
The invention changes the surface properties of the elastomeric roller covering by incorporating fluorinated polyolefin auxiliaries, which modify the surface energy and wettability characteristics. This parameter change in surface properties enables better control over ink and damping solution transfer, preventing overemulsification while maintaining the mechanical advantages of elastomeric materials.
Solution Approach 2:
The invention creates a composite structure by incorporating fluorinated polyolefin auxiliaries into the elastomeric roller covering. This composite material combines the mechanical properties of elastomers with the surface control properties of fluorinated polyolefins, achieving both reliable transfer and sharp print contours.
2Strength
If rollers with elastomeric covering are used, then abrasion resistance is improved, but back-transfer of ink occurs leading to undesirable distribution and color deviations
Solution Approach 1:
The invention modifies the surface energy parameters of the elastomeric covering through fluorinated polyolefin incorporation. This changes the interaction dynamics between the roller surface and ink, reducing adhesion and preventing back-transfer while preserving the abrasion resistance provided by the elastomeric base material.
3Strength
If rollers with elastomeric covering are used, then mechanical properties are achieved, but long-term stability and service life are limited requiring frequent maintenance
Solution Approach 1:
The invention creates a composite roller covering combining elastomeric material with fluorinated polyolefin auxiliaries. This composite structure leverages the mechanical strength and elasticity of the elastomer while the fluorinated polyolefin provides long-term surface stability and resistance to degradation, extending service life without compromising mechanical properties.
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 fluoroelastomer coating ensures precise and consistent printing results over time, reduces maintenance, and enhances back-transfer properties, leading to improved print quality and longer service life with minimal changes in properties, even under fluctuating conditions.
Implementation Method 1
a continuous surface coating covering the covering made of elastomeric material, said coating containing or entirely consisting of a fluoroelastomer
Implementation Method 2
prevents overemulsification, ensuring consistent ink and damping solution transfer
Data Source
AI summary
The invention relates to the use of a roller or a rubber blanket with a covering made of elastomeric material with an outer surface for indirect or direct transfer of a damping solution and/or a printing agent to a print carrier of a printing press. In order to enable a virtually optimum printing result, even in the presence of changing process conditions, and to display improved back-transfer properties with unchanging properties over the service life, it is proposed that a roller/rubber blanket be used which has an outer surface that constitutes an elastomeric surface coating of the covering and contains, or completely consists of, a fluoroelastomer, particularly an elastomeric fluorinated rubber. The fluorinated rubber can, in particular, be a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer.