Dampening System Rollers Ink Splitting Reduction
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Solution Overview
Problem
Ink splitting occurs in dampening rollers during offset printing, leading to contamination of the dampening solution and requiring frequent cleaning, which disrupts the printing process despite various elastomer coatings and surface finishes for rollers.
Innovation Solution
A dampening unit with rollers featuring an outer layer of aluminum hard anodize, chemical nickel, or plasma-chemically obtained aluminum oxide, optionally combined with PTFE or silicon carbide particles, is used to reduce ink splitting and enhance dampening solution transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional hard rollers (chrome, ceramic, stainless steel) are used in dampening units, then the printing process can operate continuously, but ink splitting occurs leading to dampening solution contamination and requiring frequent cleaning
Solution Approach 1:
The patent applies anodization treatment to aluminum rollers, fundamentally changing the surface parameters by creating a porous oxide layer structure. This anodized surface layer modifies the surface energy and wettability characteristics, preventing ink adhesion while maintaining dampening solution transfer efficiency, thus eliminating ink splitting without requiring frequent cleaning
Solution Approach 2:
The patent uses aluminum as the base material with an anodized aluminum oxide surface layer, creating a composite structure. The aluminum core provides mechanical strength while the anodized surface layer provides the functional properties of ink resistance and dampening solution affinity, effectively solving the ink splitting problem
2Reliability
If elastomer coatings are applied to rollers, then dampening solution transfer can be improved, but ink splitting still occurs and cleaning is required
Solution Approach 1:
Instead of using elastomer coatings, the patent changes the surface parameters of aluminum rollers through anodization, creating a porous oxide layer with specific surface energy characteristics. This anodized surface achieves reliable dampening solution transfer through its porous structure and surface chemistry while inherently resisting ink adhesion, eliminating the need for cleaning
3Manufacturing precision
If various surface finishes are applied to hard rollers, then dampening performance can be optimized, but ink build-up on roller surfaces occurs over time requiring cleaning
Solution Approach 1:
The patent applies anodization to aluminum rollers, fundamentally changing the surface parameters by creating a porous aluminum oxide layer. This anodized surface provides optimized dampening performance through its porous structure while simultaneously preventing ink build-up due to its ink-resistant surface chemistry, eliminating the need for cleaning operations
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 solution significantly reduces ink splitting, improves uniformity and washability of the dampening solution transfer, allowing for more consistent and efficient printing with reduced roller speed requirements.
Implementation Method 1
the outer layer being selected from Aluminum hard anodize
Implementation Method 2
Aluminum oxide available by plasma chemical anodic oxidation
Data Source
Figure 1~2
AI summary
Roll in a dampening system, particularly a dampening contact roll or dampening transfer roll or dampening ductor, comprising a core and an outer layer, wherein the outer layer is selected from the group consisting of hard anodized aluminum, chemical nickel and aluminum oxide, obtainable by plasmachemical anodic oxidation, and combinations thereof.