Digital Ink Application Units with Gradient Heating for Condensation Control
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Solution Overview
Problem
Existing digital printing facilities face issues with condensation buildup on ink application units, leading to nozzle clogging, increased maintenance, and production costs due to cleaning and ink wastage, particularly in high-quality decorative paper production where reproducibility and decor quality are critical.
Innovation Solution
A digital printing facility with a temperature control device and electrical control unit maintains ink application units at varying temperatures, with adjacent units differing by 0.5-1.5°C, and incorporates air stream deflectors and suction devices to prevent condensation, using heaters or coolers to adjust temperatures independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the digital printing facility operates for extended periods to achieve high productivity, then production output increases, but condensation builds up on ink application units causing nozzle clogging and requiring increased cleaning efforts
Solution Approach 1:
The system performs preliminary heating of ink application units before printing operations begin and maintains elevated temperatures during operation. This preventive thermal management stops condensation from forming in the first place, rather than addressing it after problems occur, thereby maintaining nozzle reliability during extended high-productivity printing runs
Solution Approach 2:
The system dynamically adjusts the temperature parameter of ink application units based on operational conditions. By changing the thermal state of the print heads, the system prevents condensation formation that would otherwise occur during extended operation, thus maintaining nozzle functionality while sustaining high productivity
2Reliability
If cleaning efforts are increased to remove condensation and maintain nozzle functionality, then reliability is improved, but production costs increase due to cleaning liquids and ink wastage
Solution Approach 1:
The system converts the potentially harmful effect of extended operation (which causes condensation) into a beneficial thermal state. By deliberately maintaining elevated temperatures, the system prevents condensation formation entirely, transforming what would be a harmful byproduct of high-productivity operation into a protective mechanism that eliminates the need for cleaning consumables
3Object-affected harmful factors
If the temperature of ink application units is increased to prevent condensation, then condensation buildup is reduced, but energy consumption increases
Solution Approach 1:
The system applies thermal management locally only to the ink application units rather than heating the entire printing facility. This localized approach prevents condensation at the critical print heads while minimizing overall energy consumption, as only specific components require temperature maintenance rather than the entire system
4Reliability
If cleaning operations are performed frequently to remove condensation, then nozzle reliability is maintained, but production time is lost and productivity decreases
Solution Approach 1:
The system performs preliminary and continuous thermal management of ink application units to prevent condensation formation before it can interfere with printing operations. This proactive approach eliminates the need for interruptive cleaning operations, thereby maintaining both nozzle reliability and continuous high-speed productivity without downtime
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
Reduces condensation buildup, minimizing nozzle clogging and maintenance, thus ensuring continuous and cost-effective production of high-quality decorative papers by maintaining decor reproducibility and reducing ink and cleaning liquid consumption.
Implementation Method 1
the temperatures of the ink application units increase in the feed direction and the temperatures of two neighboring ink application units differ by at least 0.5° C. and by at most 1.5° C.
Implementation Method 2
incorporates air stream deflectors and suction devices to prevent condensation
Implementation Method 3
incorporates air stream deflectors and suction devices to prevent condensation
Data Source
AI summary
The disclosure relates to a method for printing a paper by a digital printing system which has a plurality of ink application units for applying printing ink of different colours to the paper. The paper to be printed is guided past the ink application units in a feed direction. The digital printing system has a device which is designed and suitable for preventing or reducing the formation of condensation on the ink application units, and this device is used to prevent or reduce the formation of condensation on the ink application units. The device has a temperature-control device and an electrical controller, wherein the temperature-control device is designed to influence a temperature of the ink application units, and the electrical controller is designed to control the temperature-control device in such a way that the ink application units have different temperatures. The temperatures of the ink application units increase in the feed direction and temperatures of two adjacent ink application units differ by at least 0.5° C. and by at most 1.5° C. The temperatures of the first ink application unit in the feed direction and of the last ink application unit in the feed direction differ by at most 10° C.