Ink-jet Nozzle Clogging Detection via Light Diffusion
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Solution Overview
Problem
Ink-jet printing head nozzles frequently clog, leading to defective prints and significant economic losses, especially in industrial applications like ceramic tile decoration, where defects are only detectable after product completion, resulting in costly material waste and downtime.
Innovation Solution
A system using a laser lighting source and video camera to control nozzle operation by detecting ink drop diffusion, allowing for pre-print or periodic checks to prevent clogging, with a compact controlling station that can be integrated into existing machines, utilizing machine movements to position the printing head for testing and alerting operators to issues before production is affected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ink-jet printing heads are used in industrial applications, then productivity is improved, but nozzles frequently clog causing defects and economic losses
Solution Approach 1:
The patent implements preliminary detection of nozzle clogging by projecting light through the nozzle before printing operations. The system detects light diffusion patterns to identify clogged nozzles in advance, allowing preventive maintenance before defects occur during industrial printing processes.
Solution Approach 2:
The patent establishes a feedback mechanism where the detection system continuously monitors nozzle performance by analyzing light transmission patterns. This feedback loop enables real-time identification of clogging issues and triggers alerts for maintenance, ensuring consistent nozzle reliability during high-productivity industrial printing operations.
2Productivity
If printing is performed in industrial production lines, then productivity increases, but defect detection is only possible after product completion causing material waste
Solution Approach 1:
The patent enables preliminary detection of nozzle clogging conditions before they cause actual print defects. By monitoring light diffusion patterns in real-time during printing operations, the system identifies problematic nozzles early, allowing corrective action before defective products are completed and wasted.
3Reliability
If continuous monitoring of nozzle operation is implemented, then reliability improves, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical monitoring systems with an optical detection method. By projecting light through the nozzle and analyzing light diffusion patterns, the system achieves reliable nozzle monitoring using simple optical components rather than complex mechanical sensors or measurement devices.
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
Prevents material rejects and costly machine downtimes by enabling proactive maintenance, ensuring the nozzles are functioning correctly before printing, thereby reducing economic losses and maintaining production efficiency.
Implementation Method 1
The system uses a laser lighting source and video camera to control nozzle operation by detecting ink drop diffusion
Data Source
Figure 1
Figure 2~3
AI summary
A system for controlling operation of at least one nozzle of a printing head (6) comprises at least one recording system, such as a video camera (5), that is connected to or can be connected to a device and/or an electronic processor, suitable for detecting emission of at least one, preferably more than one, ink drop (2) from at least one, preferably more than one, nozzle of a printing head (6), said at least one ink drop (2) being suitably illuminated.