Flexographic Printing Press Drum Temperature Control
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Solution Overview
Problem
Existing flexographic printing presses face issues with thermal accumulation and delayed quality control, leading to deformation and quality issues in printed products, especially in double-sided printing processes, where fast drying methods cause temperature increases and result in poor online inspection capabilities.
Innovation Solution
A sheet-fed flexographic printing press is designed with two printing units, each equipped with temperature control and quality checking devices, including drums with temperature adjustment mechanisms and optoelectronic devices for real-time quality assessment, allowing for timely detection and prevention of quality issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fast drying method (hot air, infrared or UV light curing) is used to achieve fast drying of printed product, then productivity is improved, but temperature increases cause warping and deformation of printed product
Solution Approach 1:
The printing press is divided into multiple independent printing units (first printing unit, second printing unit) with separate drying and curing devices for each side. This segmentation allows independent control of drying processes for recto and verso sides, preventing thermal accumulation and deformation while maintaining high productivity through parallel processing.
Solution Approach 2:
The patent introduces a cooling device that operates before the drying device in the process sequence. The cooling device cools the printed surface immediately after printing to stabilize temperature, then the drying device performs fast drying. This preliminary cooling action prevents thermal accumulation and warping while enabling fast drying to maintain productivity.
2Productivity
If continuous drying of printed product is conducted to maintain productivity, then productivity is improved, but thermal accumulation causes deformation and quality issues
Solution Approach 1:
The patent implements periodic cooling intervals between drying operations. The cooling device operates periodically to cool the printed surface, then the drying device operates to dry the ink. This periodic alternation between cooling and drying prevents continuous thermal accumulation while maintaining continuous production capability, thus preserving both productivity and printing quality.
Solution Approach 2:
The cooling device acts as an intermediary between the printing device and the drying device. It temporarily cools the printed surface to stabilize temperature before drying begins, preventing thermal accumulation during the transition. This intermediary cooling step enables continuous drying operations without causing deformation or quality issues.
3Device complexity
If quality check is performed after both printings are completed, then device complexity is reduced, but response time for quality control is delayed
Solution Approach 1:
The inspection system is segmented into multiple checking devices positioned at different locations (first checking device, second checking device) corresponding to different printing stages. This allows quality checks to be performed at intermediate stages rather than only after completion, reducing feedback delay while maintaining manageable system complexity through modular inspection points.
Solution Approach 2:
The patent introduces checking devices that perform quality inspection before the printing process is fully completed. The first checking device checks the first side and the second checking device checks the second side at appropriate stages. This preliminary quality check allows timely feedback and correction while maintaining reasonable device complexity through distributed inspection points.
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
The solution effectively reduces thermal accumulation and enables timely quality control, preventing deformation and waste by allowing for immediate feedback and adjustment during the printing process.
Implementation Method 1
each of the first printing paper delivering drums I, the first printing paper delivering drum II, the second printing paper delivering drum I and the second printing paper delivering drum II is a drum having a temperature control device
Implementation Method 2
both the first checking device and the second checking device are configured to check material or print quality of the printing stock
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The present invention relates to the field of printing equipment and, particularly to a single-sheet flexographic printing press, which includes a first printing unit and a second printing unit for printing both surfaces of the printing stock, respectively. A first printing paper delivering drums I, the first printing paper delivering drum II, the second printing paper delivering drum I and the second printing paper delivering drum II are provided as drums having a temperature control or a quality checking device. An even number of printing paper feed drums are added between and behind the printing units corresponding to the two sides of the printed product. On one hand, the paper alternatives even times to ensure that the two sides printing of the printed product. On the other hand, the problem of thermal accumulation and timely quality control is solved by adding additional temperature control function and print quality inspection function to the printing paper drum.