Rotary Printing Press Color System Cleaning Method
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Solution Overview
Problem
Existing methods for cleaning the color system of a rotary printing press do not effectively remove ink residue from the supply and drainage lines of the doctor device, leading to incomplete cleaning and potential re-soiling during the printing process.
Innovation Solution
A method involving automatic pumping of ink into a storage container, followed by solvent cleaning of the system, where the solvent is collected in the ink reservoir and then transferred to a refuse container, ensuring the doctor chamber remains clean and preventing re-soiling, utilizing a conveyance system with pumps, valves, and a compressed air system for thorough cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the doctor device is cleaned only locally without considering supply and drainage lines, then the cleaning process is simple, but ink residue remains in the supply and drainage lines
Solution Approach 1:
The cleaning process is segmented into distinct phases: ink removal phase, solvent cleaning phase, and solvent drainage phase. The conveyance system is segmented with separate pathways for ink removal and solvent circulation, allowing independent control of each cleaning stage to ensure thorough cleaning without excessive complexity
Solution Approach 2:
The system performs preliminary actions by first removing all ink from the color system into storage containers before introducing cleaning solvent. This preliminary ink removal prevents contamination of the solvent and ensures that the cleaning phase can proceed effectively without interference from residual ink
2Manufacturing precision
If ink is not automatically pumped out before cleaning, then the cleaning process is shorter, but ink residue remains in the color system
Solution Approach 1:
The system automatically performs preliminary ink pumping out before the cleaning process begins. This preliminary action removes the majority of ink from the color system, including from supply and drainage lines, preparing the system for effective solvent cleaning and preventing re-soiling during the cleaning phase
Solution Approach 2:
The conveyance system is designed to automatically pump ink from the color system into storage containers without manual intervention. The system self-manages the ink removal process, coordinating pumps and valves to drain ink from the doctor device, ink reservoir, and conveyance lines autonomously
3Manufacturing precision
If the solvent is directly transferred to the refuse container without collecting in the ink reservoir, then the cleaning process is faster, but the doctor chamber may be re-soiled
Solution Approach 1:
The solvent drainage process is segmented into two distinct paths: clean solvent that has contacted only the doctor chamber is drained separately and can be reused, while solvent that has contacted the ink reservoir is drained to the refuse container. This segmentation prevents re-soiling of the doctor chamber while maintaining cleaning efficiency
Solution Approach 2:
The ink reservoir serves as an intermediary collection point for the cleaning solvent before final disposal. The solvent is first collected in the ink reservoir, allowing separation of clean solvent (from doctor chamber cleaning) from contaminated solvent (from ink reservoir cleaning), preventing cross-contamination and re-soiling
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 method achieves a comprehensive cleaning of the color system, reducing manual intervention and ensuring the color system is ready for the next printing job with minimal ink residue, allowing for efficient ink usage and system maintenance.
Implementation Method 1
A: automatically pumping the ink off the color system via the conveyance system into the storage container
Implementation Method 2
in a first cleaning step the solvent being collected in the ink reservoir
Implementation Method 3
B: automatically cleaning the color system via the solvent, with in a first cleaning step the solvent being collected in the ink reservoir
Implementation Method 4
in a second cleaning step the solvent being conveyed into the refuse container
Data Source
AI summary
A color system of a rotary printing press includes a doctor blade device with a doctor blade chamber containing ink for a printing process, an ink reservoir from which ink is supplied to the doctor blade chamber, and a supply system which allows ink to be supplied inside the color system. The color system is connected to a storage reservoir into which ink from the color system is introduced, to a solvent reservoir containing solvent for cleaning the color system, and to a refuse container into which ink soiled by the solvent is introduced. The supply system cleans the color system by automatically pumping off ink to the storage reservoir, and automatically cleaning with the solvent, by collecting the ink in the ink reservoir and supplying the solvent to the refuse container.