Variable Lithographic Inking System with Chamber Blade and Transfer Roll
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Solution Overview
Problem
Traditional offset printing systems, including keyless inking systems, suffer from ghosting and make ready issues due to non-uniform ink film thickness on the form roller, which is not compatible with the requirements of variable data lithographic printing that demands consistent ink distribution across different print jobs.
Innovation Solution
The implementation of a compact inking system with an anilox roll, intermediate transfer roll, and form roll, where the anilox roll meters ink to the transfer roll, and the transfer roll applies pressure to ensure uniform ink distribution, and a doctor blade system for cleaning and recycling ink from the form roll, allowing for adjustable pressure and temperature control to achieve consistent ink thickness and optical density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If large diameter anilox and form rollers are used in keyless inking systems, then uniform ink delivery is achieved, but system size and weight increase
Solution Approach 1:
The patent changes the physical parameters of the roller system by using smaller diameter rollers with modified surface properties and configurations. The anilox roller uses a different cell structure and the form roller has a modified surface treatment that enables uniform ink delivery without requiring large roller diameters, thus reducing system weight while maintaining printing quality
Solution Approach 2:
The patent replaces the traditional mechanical reliance on large roller diameters for ink uniformity with an alternative mechanism involving controlled pressure application, modified roller surface structures, and adjusted ink formulation that works effectively with smaller rollers, thereby achieving the same uniformity effect without the weight penalty
2Reliability
If large diameter rollers are used to ensure uniform ink thickness, then ghosting is reduced, but device complexity and size increase
Solution Approach 1:
The patent modifies critical parameters including roller surface roughness, anilox cell depth and distribution, ink viscosity, and pressure application characteristics to achieve uniform ink transfer with smaller rollers, eliminating the need for large diameter rollers and their associated system complexity
Solution Approach 2:
The patent introduces an intermediate transfer roller that acts as a mediator between the anilox roller and the form roller. This intermediate roller helps distribute ink more uniformly and reduces the direct coupling requirements between anilox and form rollers, simplifying the overall system design while reducing ghosting effects
3Manufacturing precision
If manual keys are used to adjust ink flow in traditional offset printing, then solid imaging regions receive adequate ink, but system complexity and operation difficulty increase
Solution Approach 1:
The patent implements a self-regulating inking system where the controlled pressure application and modified roller configurations automatically adjust ink distribution based on the printing conditions. The system self-adjusts to provide appropriate ink flow to different regions without requiring manual key adjustments, making operation simpler while maintaining precision
Solution Approach 2:
The patent replaces the manual mechanical key adjustment system with an automated pressure control mechanism that uses controlled force application and modified roller surface properties to achieve proper ink distribution, eliminating the need for manual intervention and simplifying operation
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 enables ghostless variable lithographic printing by ensuring uniform ink application and recycling, reducing system size and weight, and eliminating the need for large rollers, thus enhancing print quality and efficiency.
Implementation Method 1
a metered anilox roller to pull fresh ink uniformly out of an ink tray and deliver the ink
Implementation Method 2
Such keyless systems use a metered anilox roller to pull fresh ink uniformly out of an ink tray
Implementation Method 3
urging the transfer roll against the form roll to apply pressure to the ink at the second transfer nip
Implementation Method 4
Different regions of the imaging plate may need more or less ink depending upon which regions are oleophilic foreground areas
Data Source
AI summary
A variable lithographic inking system includes a chamber blade system configured to supply ink to an anilox member of an inking system. The inking system includes a soft ink transfer roll and a hard form roll. Ink is transferred from the anilox roll to the form roll by way of the transfer roll, and from the form roll to a reimageable surface layer of an imaging member of a variable data lithographic system. An ink layer free of ink history is uniformly applied onto a surface of the form roll, and subsequently transferred to the reimageable surface layer while avoiding or substantially eliminating image ghosting related to inking non-uniformities.