Printing Device Fluid Contamination Control
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Solution Overview
Problem
Current printing technologies for organic semiconductor materials face significant contamination challenges due to particle and gas absorption, leading to high production costs and inefficiencies, as well as stringent purity requirements that are difficult and costly to maintain.
Innovation Solution
A method involving a cleaning cycle where the fluid is circulated and cleaned multiple times through a system incorporating filtration, degassing, and a contamination measuring device to ensure the fluid meets specified purity thresholds before use, with the option to return contaminated fluid to the reservoir for further cleaning and the integration of the print head into the cleaning circuit to remove impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multi-stage purification, filtration, and degassing processes are implemented to achieve required fluid purity, then contamination level is reduced, but manufacturing effort and production costs increase significantly
Solution Approach 1:
The system performs preliminary cleaning of the fluid in a cleaning circuit before the fluid reaches the printhead. A contamination measuring device monitors the fluid quality in advance, and if contamination exceeds thresholds, the fluid is redirected through the cleaning circuit for预处理 purification. This preliminary action prevents contaminated fluid from reaching the printhead, reducing the need for extensive multi-stage purification downstream.
Solution Approach 2:
The contamination measuring device provides real-time feedback on fluid quality by continuously monitoring contamination levels. Based on this feedback, the control unit dynamically adjusts the fluid path - either allowing direct flow to the printhead when quality is acceptable or redirecting through the cleaning circuit when contamination exceeds thresholds. This closed-loop feedback system optimizes manufacturing effort by applying cleaning only when necessary.
2Object-affected harmful factors
If fluid is circulated and cleaned multiple times through cleaning cycles, then contamination is reduced, but processing time increases
Solution Approach 1:
The system uses the fluid itself to clean the cleaning circuit components. The fluid circulates through the cleaning circuit where it picks up contaminants from filters and degassing units, then returns to the reservoir. This self-service mechanism allows continuous cleaning without requiring separate cleaning operations or stopping the printing process, thereby minimizing time loss while maintaining low contamination levels.
Solution Approach 2:
The system performs preliminary cleaning of the fluid in a cleaning circuit before the fluid reaches the printhead. A contamination measuring device monitors the fluid quality in advance, and if contamination exceeds thresholds, the fluid is redirected through the cleaning circuit for预处理 purification. This preliminary action prevents contaminated fluid from reaching the printhead, reducing the need for extensive multi-stage purification downstream.
3Manufacturing precision
If stringent purity requirements are enforced throughout production and transport, then product quality is maintained, but production costs and quality control effort increase
Solution Approach 1:
The contamination measuring device provides real-time feedback on fluid quality by continuously monitoring contamination levels. Based on this feedback, the control unit dynamically adjusts the fluid path - either allowing direct flow to the printhead when quality is acceptable or redirecting through the cleaning circuit when contamination exceeds thresholds. This closed-loop feedback system optimizes manufacturing effort by applying cleaning only when necessary.
Solution Approach 2:
The system replaces complex mechanical multi-stage purification processes with a simpler electronic control system that uses sensors to monitor fluid quality and automatically redirects fluid through cleaning circuits only when needed. This substitution of mechanical purification stages with sensor-based control reduces quality control effort while maintaining stringent purity requirements.
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 approach significantly reduces contamination and production costs by ensuring the fluid meets desired purity levels before printing, allowing for efficient use of organic semiconductor materials and minimizing waste, while also reducing the effort required for quality control and fluid handling.
Implementation Method 1
The cleaning methods known from practical experience, such as filtration or degassing, exhibit an average or maximum cleaning efficiency
Implementation Method 2
The cleaning methods known from practical experience, such as filtration or degassing, exhibit an average or maximum cleaning efficiency
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a method for operating a printing device (1) wherein a fluid provided for a printing step is guided from a fluid reservoir (6), via a supply line (14), to a print head (13) in order to be able to be applied to the surface by the print head (13). The fluid is guided through a cleaning device (8) in a cleaning circuit (2) and a variable characterising the contaminates in a sample amount of fluid in the cleaning circuit (2) is determined using a contaminant measuring device (11), such that a printing step in which the fluid is distributed by the print head (13), is only started after the variable characterising the contaminates is below a first threshold value. The invention also relates to a printing device (1) having a print head (13) and having a connection device (12) for a fluid reservoir (6), said connection device being connected to the print head (13) by means of a supply line (14). The printing device (1) comprises a cleaning circuit (2) which is formed form the fluid line sections (3, 4, 5) and which comprises a cleaning device (8) and a contaminant measuring device (11), in which the fluid withdrawn from the fluid reservoir (6) via the fluid withdrawal device is cleaned and a variable characterising the contaminates in a sample amount of the fluid can be determined in the cleaning circuit (6) before the cleaned fluid is guided to the print head (13).