Dryer Management System for Web Temperature Control
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Solution Overview
Problem
High-speed printing systems face challenges in controlling material shrinkage and avoiding system control problems due to the elastic deformability of flexible web substrates, which can lead to wrinkles and damage to ink jet printheads, resulting in costly downtime and replacement costs.
Innovation Solution
A dryer management system that includes a web transport, a series of dryer units with heater units generating heated air, temperature sensing devices to monitor the web temperature, and a closed-loop dryer controller that adjusts the operation of the heater units to ensure sufficient drying of the material on the web while maintaining the web temperature below a maximum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high speed printing is used to increase productivity, then production efficiency is improved, but material shrinkage control and web stability deteriorate due to elastic deformability
Solution Approach 1:
The system performs preliminary drying of the web before it reaches the inkjet printheads by using dryer units upstream. This preliminary action removes excess moisture and reduces elastic deformability, thereby stabilizing the web and preventing wrinkles and printhead damage during high-speed printing operations.
Solution Approach 2:
The system employs temperature sensors to continuously monitor web temperature and a closed-loop controller that adjusts dryer unit operation based on real-time temperature feedback. This ensures optimal drying conditions are maintained, preventing both insufficient drying (which causes web instability) and overheating (which causes material damage), thereby maintaining web stability at high printing speeds.
2Productivity
If heating temperature is increased to improve drying efficiency, then drying speed is improved, but web temperature control and material integrity worsen due to risk of exceeding maximum temperature
Solution Approach 1:
Temperature sensors positioned near the web continuously monitor web temperature, and the closed-loop controller adjusts dryer unit operation based on real-time feedback. This ensures the web is dried efficiently while maintaining temperature below the maximum threshold to prevent material damage.
Solution Approach 2:
The system dynamically adjusts the operation of dryer units based on real-time web temperature conditions. The closed-loop controller modulates heating intensity and dryer operation to match actual drying needs, enabling high drying speed when appropriate while automatically reducing heat input when the web approaches maximum temperature limits.
3Reliability
If dryer operation is increased to ensure sufficient drying, then drying effectiveness is improved, but energy consumption and system complexity worsen
Solution Approach 1:
The closed-loop controller uses temperature sensor feedback to precisely control dryer unit operation, activating heating only when and where needed to achieve sufficient drying. This avoids unnecessary energy consumption while ensuring reliable drying effectiveness through targeted, condition-based dryer operation.
Solution Approach 2:
The system changes operational parameters of dryer units dynamically based on web conditions, adjusting temperature, airflow, and dryer activation levels to achieve optimal drying effectiveness with minimum energy consumption. The closed-loop controller modulates these parameters in real-time based on temperature feedback.
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
The system effectively manages the drying process, preventing wrinkles and material shrinkage, reducing the risk of printhead damage, and minimizing downtime and replacement costs by ensuring consistent and controlled temperature and drying conditions.
Implementation Method 1
heater unit adapted to generate a flow of heated air to heat the web
Implementation Method 2
temperature sensing device disposed proximate the web to develop an indication of a temperature of the web
Data Source
Figure 1
Figure 2~3
Figure 3A
AI summary
A dryer management system includes a global dryer control system and a closed loop dynamic dryer control system to manage drying of a material deposited on web. The global dryer control system analyzes information regarding a production run to determine a web conveyance speed and a maximum web temperature. The closed loop dynamic dryer control system monitors an indication of a temperature of the web to maintain the indication of the temperature below the maximum web temperature. The closed loop dynamic dryer control system also analyzes images of the web to determine if the material is being insufficiently dried.