Digital Offset Printing Intermediate Transfer Module Wear Reduction
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Solution Overview
Problem
Conventional digital offset printing methods, particularly 'one shot' processes, face issues with wear on intermediate transfer modules, drying problems, and non-uniform ink transfer due to the accumulation and simultaneous transfer of multiple inks, leading to reduced image clarity and increased module wear.
Innovation Solution
The method involves accumulating and transferring a reduced number of component images (e.g., two) at a time to the substrate, utilizing thermal assistance and chemical affinity, reducing the intensity on the intermediate transfer module and substrate, and allowing for efficient layering and drying processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all component images are accumulated and transferred simultaneously to the substrate, then productivity is improved, but wear on the intermediate transfer module increases and drying problems occur
Solution Approach 1:
The printing process is divided into multiple passes, with each pass transferring only a subset of component images (e.g., one or two inks) to the substrate. This segmentation reduces the accumulation intensity on the intermediate transfer module during each pass, thereby reducing wear and extending module lifetime while maintaining overall productivity through efficient multi-pass operation.
2Productivity
If multiple inks are accumulated and transferred simultaneously, then productivity is improved, but drying problems and non-uniformity increase
Solution Approach 1:
The transfer process is segmented into multiple passes, with each pass handling a limited number of ink layers. This reduces the non-uniformity of ink accumulation on the intermediate transfer module and substrate, ensuring better drying characteristics and sharper image definition while maintaining high productivity through optimized multi-pass sequencing.
3Reliability
If a reduced number of component images are transferred at a time, then wear on the intermediate transfer module is reduced, but productivity decreases
Solution Approach 1:
The printing system maintains continuous operation by performing multiple passes without stopping the substrate feed or intermediate transfer module rotation. Each pass transfers a subset of component images, and the system seamlessly sequences between passes, ensuring that the useful action of printing continues uninterrupted, thereby maintaining high productivity while reducing per-pass wear intensity.
4Manufacturing precision
If a reduced number of component images are transferred at a time, then drying problems are minimized, but productivity decreases
Solution Approach 1:
The system maintains continuous printing operation through multiple passes, with each pass transferring a manageable number of ink layers that dry uniformly. The substrate and intermediate transfer module continue moving without interruption, and the system efficiently sequences between passes, ensuring continuous productivity while achieving superior image quality and drying characteristics through reduced per-pass ink accumulation.
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 approach reduces wear on the intermediate transfer module, minimizes drying issues, and enhances image clarity by reducing non-uniformity, while also offering time savings and improved operational efficiency in digital offset printing.
Implementation Method 1
this holding force is provided by electrostatic forces
Implementation Method 2
utilizing thermal assistance and chemical affinity
Implementation Method 3
utilizing thermal assistance and chemical affinity
Data Source
AI summary
The present invention provides a digital offset printing method for producing a composite image on a substrate wherein the image is made up of a first plurality number of component images, each being formed from a different ink. The method comprises providing a first component image on a first surface, transferring the first component image from the first surface to an intermediate transfer module, repeating said provided and transferring steps for further component images until a second plurality number, less than the first plurality number, of component images has been accumulated on the intermediate transfer module, and transferring the accumulated component images from the intermediate transfer module to the substrate. The step of transferring the accumulated images from the intermediate transfer module to the substrate comprises applying a plurality of inks, which correspond to the second plurality number of accumulated component images, to the substrate, and repeating said steps until all of the first plurality number of component images have been transferred to the substrate.