Print Head Arrangement With Auxiliary Nozzles For Ink-Jet Pre-Treatment
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Solution Overview
Problem
Ink-jet printers face issues with droplet spreading and bleeding on various substrates due to evaporation of printing fluid, affecting image quality, as existing pre-treatment fluids are not optimized for different substrates.
Innovation Solution
A print head arrangement with both main and auxiliary nozzles is used, where the auxiliary nozzles apply a pre-treatment fluid containing a fixing agent to react with the printing fluid, and a controller selects the appropriate nozzles and application pattern based on the substrate's thermal inertia and porosity to prevent droplet spreading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pre-treatment fluid is applied to prevent droplet spreading, then image quality is improved, but device complexity increases due to additional nozzles and control mechanisms
Solution Approach 1:
The printing device is segmented into multiple independent nozzle groups: main nozzles for printing fluid and auxiliary nozzles for pre-treatment fluid. This segmentation allows each nozzle type to be optimized for its specific function, improving image quality through controlled pre-treatment while managing complexity by organizing functions into separate modular units
Solution Approach 2:
The auxiliary nozzles are designed to be multi-functional: they can apply pre-treatment fluid containing fixing agents to react with printing fluid, and their application can be selectively activated or deactivated based on substrate properties. This universality allows the same hardware structure to serve different functions depending on operational requirements, improving image quality without permanently increasing complexity
2Manufacturing precision
If pre-treatment fluid is applied to all substrates, then droplet spreading is reduced, but adaptability decreases because existing pre-treatment fluids are not optimized for different substrates
Solution Approach 1:
The system dynamically adapts its operation based on detected substrate properties (thermal inertia and porosity). The controller selectively activates auxiliary nozzles and adjusts pre-treatment fluid application parameters according to the specific substrate type, enabling optimal droplet spreading control for each substrate while maintaining versatility across different material types
Solution Approach 2:
The pre-treatment fluid application is localized and optimized for specific substrate regions and types. By detecting substrate properties and applying pre-treatment fluid only when and where needed with customized parameters, the system achieves effective droplet spreading control for each local substrate condition while maintaining overall system adaptability to various substrate types
3Manufacturing precision
If auxiliary nozzles are added to apply pre-treatment fluid, then image quality is enhanced, but manufacturing cost increases
Solution Approach 1:
Instead of equipping all printing positions with both main and auxiliary nozzles, the system implements auxiliary nozzles selectively at specific positions where pre-treatment is most beneficial. The controller activates only the necessary auxiliary nozzles based on substrate properties and printing requirements, achieving enhanced image quality while reducing manufacturing costs by minimizing the number of auxiliary components needed
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 solution effectively reduces droplet spreading and bleeding by optimizing the application of pre-treatment fluid according to the substrate's properties, enhancing image quality across different materials.
Implementation Method 1
The pre-treatment fluid may react with the printing fluid and may thereby fix the printing fluid on the substrate
Implementation Method 2
The fluid may evaporate subsequently, leaving behind the pigments on the substrate
Data Source
AI summary
Disclosed herein is a print head arrangement, a printing device and a method of operating a printing device. The print head arrangement comprises a main print head having a plurality of printing nozzles for ejecting a printing fluid and an auxiliary print head having a plurality of pre-treatment nozzles for ejecting a pre-treatment fluid. The print head arrangement further comprises a controller that is to obtain a print medium parameter and to select a subset of the plurality of pre-treatment nozzles for application of the pre-treatment fluid based on the print medium parameter. The print medium parameter characterizes a thermal inertia of the print medium.