Printing Press as Lead Machine in Corrugated Board Production
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Solution Overview
Problem
The coordination of printing presses with corrugators in corrugated board production is often problematic, particularly regarding speed and web tension, leading to inefficiencies and suboptimal printing results.
Innovation Solution
A method and system where the printing press operates as the lead machine, with a speed control system specifying the overall speed for downstream machines, including a virtual master axis to ensure consistent operation, and separate web tension control for other sections, allowing the corrugator to follow the printing press's speed without requiring modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the corrugator is operated as the lead machine with the printing press following its speed, then the corrugator maintains control over the production process, but the printing quality deteriorates due to speed variations and web tension fluctuations
Solution Approach 1:
The patent inverts the traditional master-slave relationship by making the printing press the lead machine that sets the speed, while the corrugator follows as the downstream machine. This inversion resolves the contradiction by prioritizing printing quality (which requires stable speed and tension) over traditional production control hierarchy, achieving both high-quality printing and efficient production through the printing press's superior speed control capabilities
Solution Approach 2:
The patent introduces a dancer roller as an intermediary device between the printing press and corrugator. This dancer roller acts as a buffer that decouples the two machines, allowing the printing press to operate at constant speed while the corrugator adjusts to match. The dancer roller absorbs speed variations and maintains optimal web tension, resolving the contradiction by providing mechanical mediation that protects printing quality while enabling production flexibility
2Reliability
If a dancer roller is installed between the printing press and corrugator to adjust web tension, then web tension control is improved, but the device complexity increases and installation space is required
Solution Approach 1:
The dancer roller is designed as a self-regulating device that automatically adjusts web tension through its own mechanical movement. The roller can freely move vertically to absorb tension variations without requiring external control systems, sensors, or actuators. This self-service mechanism improves reliability by providing passive, fail-safe tension control while minimizing device complexity and eliminating the need for additional control electronics or complex mechanical linkages
3Manufacturing precision
If the printing press is converted to the lead machine role, then printing quality and speed consistency are improved, but compatibility issues arise with existing corrugators that are designed to be the master machine
Solution Approach 1:
The patent creates a universal control architecture where the printing press serves as the master machine that can control not only itself but also downstream corrugators. The speed control system is designed to provide reference speed signals that can be adopted by any downstream machine, making the system compatible with various corrugator configurations. This multi-functional approach allows the printing press to maintain its lead role while ensuring broad system compatibility and flexibility
Data Source
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AI summary
The invention relates to a method for operating a system (2) comprising a corrugator (4) and a printing machine (6), wherein the corrugator (4) has a number of processing units (8) for processing one or more paper webs (18), wherein the printing machine (6) prints a paper web and outputs same as a printed paper web (18) to the corrugator (4), wherein the system (2) has a speed controller (34) which specifies a speed of a lead machine for a number of follower machines, such that they follow the lead machine, wherein the printing machine (6) is the lead machine, wherein at least one of the processing units (8) of the corrugator (4) is a follower machine. The invention also relates to a corresponding system (2).