Print Region Based Drying Control for Imaging Systems
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Solution Overview
Problem
Imaging systems face challenges in managing the drying process of print media, particularly due to varying print substance densities, which can lead to issues like media distortion, curling, and finishing defects, as existing technologies do not effectively adjust print speed and drying mechanisms on a per-page basis to ensure complete dryness before further processing.
Innovation Solution
The system determines print density thresholds for each region of a print job and adjusts the print process speed and drying mechanisms, such as decreasing transport speed through a dryer or increasing dryer temperature, to provide additional drying time based on weighted scores calculated from print density data, ensuring complete dryness and improved media handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the print media is transported at a constant speed through the dryer, then the printing process is efficient and productive, but the print substance may not be completely dry in regions with high print density, causing media distortion and curling
Solution Approach 1:
The system dynamically adjusts the transport speed of the print media through the dryer based on real-time detection of print density. Regions with higher print density receive extended drying time through slower transport, while low-density regions maintain faster transport speed, resolving the contradiction between productivity and drying completeness.
Solution Approach 2:
The drying process is customized for different regions of the print media based on local print density characteristics. The system applies region-specific drying parameters (speed adjustments, temperature modifications) to ensure each area receives appropriate drying treatment, preventing both under-drying and excessive drying in any single region.
2Reliability
If the transport speed is decreased to increase drying time, then the print substance dries more completely, but the overall printing productivity decreases
Solution Approach 1:
The print media is divided into multiple regions with different print density characteristics, and each region is processed with customized drying parameters. This segmentation allows the system to apply speed reductions only to specific high-density regions that require extended drying, while maintaining faster throughput for low-density regions, thus resolving the contradiction between drying completeness and overall productivity.
Solution Approach 2:
The transport speed is dynamically adjusted during the drying process based on detected print density variations. The system continuously monitors and modifies speed in real-time, ensuring optimal drying where needed while maintaining high productivity elsewhere, preventing the need for uniform speed reduction across the entire media.
3Loss of time
If the dryer temperature is increased to accelerate drying, then the drying time is reduced, but the risk of media distortion and print substance damage increases
Solution Approach 1:
The system applies region-specific temperature control during drying based on print density detection. High-density regions receive extended drying time at moderate temperatures, while low-density regions experience faster throughput. This localized approach eliminates the need for uniform high-temperature drying, preventing media distortion while achieving complete drying where required.
Solution Approach 2:
The drying process utilizes dynamic parameter changes, adjusting both temperature and transport speed based on detected print density. Rather than relying solely on high temperature to reduce drying time, the system modifies multiple parameters (speed, temperature) in combination, achieving effective drying without the harmful effects of excessive temperature exposure.
4Reliability
If additional drying time is provided for high-density regions, then media handling reliability improves, but the overall print process duration increases
Solution Approach 1:
The print media surface is segmented into multiple regions with different drying requirements based on print density. The system processes each region according to its specific needs, providing extended drying time only to high-density regions that require it for reliable handling, while maintaining faster processing for low-density regions, thus minimizing overall process duration while ensuring handling reliability where critical.
Solution Approach 2:
The drying process is dynamically optimized by continuously adjusting transport speed and temperature based on real-time detection of print density variations. This dynamic control ensures that additional drying time is invested only where necessary for handling reliability, preventing unnecessary delays in regions that dry adequately with standard parameters, thereby resolving the contradiction between reliability and process duration.
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 ensures that printed media is fully dry before finishing operations, reducing defects like smears and misalignment, and enhances media stiffness and handling reliability by dynamically compensating for print density variations across the page.
Implementation Method 1
adjusting a drying process of the print media in response to the score
Implementation Method 2
increasing dryer temperature
Data Source
AI summary
Some examples include a print system including a memory to store instructions and print data of a print job, a processor to execute the instructions in the memory to reference print data of a print job, transform the print data into a plurality of print regions of a medium representation, each of the plurality of print regions including a print density, determine the quantity of print regions having a print density exceeding a predetermined threshold, and apply a modifier to the quantity of print regions having a print density exceeding the predetermined threshold to generate a score. The print system includes a print engine to move the medium along the print path to deposit a print substance onto a medium and apply drying to the medium and a controller to control a drying of the medium along the print path of the print engine in response to the score.