Print Conditioner Speed Control for Media Flatness
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Solution Overview
Problem
Imaging systems face issues with over-drying or too rapid drying of print media, leading to distorted properties such as curling, cockle, reduced stiffness, and increased surface roughness, which can result in print defects and finishing issues.
Innovation Solution
The imaging system employs a conditioner with a heated pressure roller assembly and adjustable speed control to regulate the drying process, allowing for selective adjustment of the medium's speed through the conditioner to maintain optimal moisture levels and prevent over-drying, using sensors to determine print parameters and environmental conditions for precise phase change control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drying process is accelerated to improve productivity, then the drying speed increases, but the media develops distorted properties such as curling, cockle, and reduced stiffness
Solution Approach 1:
The system dynamically adjusts the transport speed of the medium through the conditioner based on real-time detection of medium properties and drying state. The transport speed is variable rather than fixed, allowing optimization of both drying efficiency and media quality by matching speed to actual medium conditions
Solution Approach 2:
The system changes physical parameters (transport speed, temperature, humidity) of the conditioning environment to control the drying process. By adjusting these parameters based on detected medium state, the system achieves optimal drying without causing distortion
2Reliability
If the medium moves slower through the conditioner to prevent over-drying, then media quality is maintained, but productivity decreases
Solution Approach 1:
The system uses sensors to detect medium properties (moisture content, temperature, flatness) and feeds this information back to the control system, which adjusts the transport speed accordingly. This closed-loop control allows the system to maintain media quality while optimizing throughput by preventing both under-drying and over-drying
Solution Approach 2:
The transport speed is made dynamically adjustable rather than fixed, allowing the system to accelerate through the conditioner when media conditions permit faster drying, and slow down when quality control is needed, thereby optimizing both productivity and reliability
3Device complexity
If uniform drying conditions are applied to all media, then the process is simple, but environmental variations cause inconsistent drying results
Solution Approach 1:
The system applies different conditioning conditions to different portions or batches of media based on local environmental variations and medium-specific properties. Sensors detect local conditions and the system adjusts parameters locally rather than applying uniform conditions throughout, ensuring consistent drying results despite environmental variations
Solution Approach 2:
The system dynamically changes conditioning parameters (temperature, humidity, transport speed) based on detected environmental conditions and medium properties, allowing adaptation to varying conditions while maintaining drying consistency
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 effectively mitigates the effects of over-drying, maintaining media quality and reliability by controlling the drying process, reducing distortions and ensuring consistent print and finishing results.
Implementation Method 1
a conditioner with a heated pressure roller assembly and adjustable speed control to regulate the drying process
Implementation Method 2
allowing for selective adjustment of the medium's speed through the conditioner to maintain optimal moisture levels and prevent over-drying, using sensors to determine print parameters and environmental conditions for precise phase change control
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, determine a print parameter of the print job, and transform the print data and the print parameter into a conditioning modifier. The print system includes a print engine to dispense a print substance on a medium based on the print data to generate printed medium, and a conditioner to apply heat and pressure to the printed medium, the conditioner including a pressure roller assembly, and a controller to selectively increase a transport speed the pressure roller assembly based on the conditioning modifier and a position of the printed medium relative to the pressure roller assembly to selectively increase the speed of the printed medium through the conditioner.