Threshold-Based Treatment Fluid Control for Print Substrate
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Solution Overview
Problem
In printing, existing methods for applying treatment fluids to substrates often result in inefficiencies, such as excessive treatment usage leading to substrate warping, increased costs, and aerosol production, particularly when ink densities are low, where the benefits of treatment are minimal.
Innovation Solution
A method is introduced where treatment is applied only to substrate locations with ink densities above a certain threshold, determined by computing a metric value from pixel values in the neighborhood of each pixel, using a treatment printhead unit to eject treatment fluid only when the sum of pixel values exceeds a specific level, thereby optimizing treatment usage and enhancing print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If treatment fluid is applied to all substrate locations, then ink fixation is improved, but substrate warping increases and treatment cost increases
Solution Approach 1:
The patent applies treatment fluid selectively only to substrate locations where ink density exceeds a threshold value, rather than uniformly across the entire substrate. This local quality approach ensures that treatment is applied where needed for ink fixation while avoiding unnecessary treatment areas that would cause substrate warping and increase costs.
Solution Approach 2:
The patent introduces a threshold parameter for ink density that determines whether treatment fluid application is activated. By changing the treatment application condition from universal to threshold-based, the system optimizes the balance between achieving sufficient ink fixation and preventing substrate warping by avoiding over-treatment.
2Reliability
If treatment fluid is applied to all substrate locations, then ink fixation is improved, but treatment cost increases
Solution Approach 1:
The system applies treatment fluid only to specific substrate locations where ink density exceeds the threshold, rather than treating the entire substrate. This reduces the quantity of treatment fluid consumed while maintaining effective ink fixation where ink is actually present.
Solution Approach 2:
The patent uses partial action by applying treatment fluid only to the extent necessary (where ink density exceeds threshold) rather than excessive action (applying to all locations). This optimized partial application reduces treatment fluid consumption while achieving sufficient fixation效果.
3Area of stationary object
If treatment fluid is applied to low ink density areas, then coverage is improved, but aerosol production increases and treatment efficiency decreases
Solution Approach 1:
The system selectively applies treatment fluid only to substrate locations with sufficient ink density (above threshold), avoiding low ink density areas. This prevents unnecessary aerosol generation in areas where treatment would not provide meaningful fixation benefit, while still achieving adequate coverage where ink is present.
Data Source
AI summary
In some examples herein, control data is for application of treatment fluid on a treatment substrate location surrounding a substrate dot corresponding to a first pixel of the digital image. Treatment fluid is ejected on the treatment substrate location if a metric value computed from pixel values of a set of pixels in the neighborhood of the first pixel is above a threshold level.