Double Flexographic Printing Stations with Common Impression Cylinder
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Solution Overview
Problem
Existing printing presses face inefficiencies in job changes, resulting in downtime and waste due to the need for breaking the printing process, especially during color changes, which leads to reduced performance and increased scrap material.
Innovation Solution
A printing machine design featuring double flexographic printing stations with a common impression cylinder allows for continuous operation by enabling one unit to print while the other is serviced or changed, minimizing waste through synchronized activation and deactivation of flexographic printing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional single printing units are used with modular design, then the printing press can be expanded as required, but a considerable length of web is stored in the printing press resulting in significant waste during changeovers
Solution Approach 1:
The printing press is divided into multiple independent printing units (first, second, third, and fourth printing units) that can be selectively activated. This segmentation allows the operator to use only the necessary number of printing units for a given job, reducing the length of web stored in the system and minimizing waste during changeovers while maintaining expandability.
2Adaptability or versatility
If sleeves are changed in traditional printing presses, then job changes can be made, but the printing process must be broken causing downtime and start-up waste
Solution Approach 1:
The second and fourth printing units are prepared in advance with different printing sleeves or plates corresponding to different print jobs. While the first printing unit is actively printing job A, the second unit is already prepared for job B. This preliminary preparation allows for rapid job changes without stopping the printing process, eliminating downtime and start-up waste.
Solution Approach 2:
The printing press enables continuous operation by allowing one printing unit to remain active while another is prepared or changed. The web feed continues uninterrupted, and the switched printing unit takes over seamlessly, maintaining continuous productive action without breaks that would cause waste.
3Productivity
If multiple printing units are arranged in series, then productivity can be increased, but the flexographic printing units cannot be easily accessed by the machine operator for maintenance and changes
Solution Approach 1:
The printing units are arranged in a spatial configuration that provides multiple access dimensions. The first and third printing units are positioned to be accessible from the front, while the second and fourth units are accessible from the rear or sides. This multi-dimensional arrangement allows the operator to easily access any printing unit for maintenance or changes without disrupting the series arrangement that ensures high productivity.
Data Source
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AI summary
The invention relates to a printing machine for printing a substrate web (1) with a plurality of flexographic printing units (11) arranged in series, wherein the flexographic printing units (11) are arranged in a plane (E) accessible to the machine operator, and is characterized in that two flexographic printing units (11) of the plurality of flexographic printing units (11) always form a double printing station (10), and that the two flexographic printing units (11) of a respective double printing station (10) have a common impression cylinder (16).