Air Wipe and Sheet Guide Temperature Control for Scanner Accuracy
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Solution Overview
Problem
On-line measurements of continuous sheet materials during production are affected by ambient temperature fluctuations, leading to inaccurate readings due to variations in the temperature of the sheet material and external influences, which existing scanner systems struggle to control effectively.
Innovation Solution
A dual head scanner system with temperature control mechanisms, including heated air wipes and adjustable plate heaters, along with temperature sensors and control systems to maintain a consistent temperature profile within the measurement gap, ensuring accurate readings during both on-sheet and off-sheet operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature control mechanisms (heated air wipes and plate heaters) are added to the scanner system, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The temperature control system is divided into separate functional components: heated air wipes for ambient temperature control and plate heaters for surface temperature control. This segmentation allows independent control of different temperature zones, improving measurement accuracy while managing system complexity through modular design.
Solution Approach 2:
Heated air acts as an intermediary medium between the external environment and the measurement gap, creating a thermal buffer that stabilizes the ambient temperature. Similarly, heated plates serve as intermediaries between the sheet material and sensors, ensuring consistent thermal conditions for accurate measurements.
2Stability of the object's composition
If heated air is continuously supplied into the measurement gap, then temperature stability is improved, but energy consumption increases
Solution Approach 1:
Heated air is supplied continuously through air wipes during both on-sheet measurement and off-sheet calibration operations. This continuous supply maintains stable temperature conditions in the measurement gap, eliminating temperature fluctuations that would otherwise require more aggressive (and energy-intensive) corrective heating.
Solution Approach 2:
Air is pre-heated before being supplied into the measurement gap, preventing cold air infiltration that would destabilize the thermal environment. This preliminary heating action reduces the energy required for active temperature control during measurement operations.
3Measurement precision
If the scanner operates in off-sheet mode for calibration, then sensor accuracy is improved, but productivity decreases due to operation time
Solution Approach 1:
Temperature sensors continuously monitor conditions in the measurement gap and provide feedback to the control system. During off-sheet calibration operations, this feedback ensures that temperature remains stable, allowing calibration to proceed quickly and efficiently without requiring extended operation times, thus maintaining productivity while improving sensor accuracy.
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 provides consistent and accurate measurements by maintaining the temperature within the measurement gap at a stable level, reducing temperature-induced variations and improving the reliability of parameters such as basis weight, ash content, and thickness measurements.
Implementation Method 1
means for supplying a heated gas at the web entry end such that the heated gas flows continuously into the measurement gap via the web entry end and out of the measurement gap through the web exit end
Implementation Method 2
means for heating the first operative surface; means for heating the second operative surface
Data Source
AI summary
Paper and continuous web scanners operate at varying and high temperature conditions. Regulating the temperature within the measurement gap between dual scanner heads during measurement and calibration modes of operation by employing air wipe and sheet guide temperature control assures consistent and accuracy sensor measurements of sheet characteristics. Air wipes blow pre-heated air into the measurement and the sheet guides are heated. The air temperature fluctuations that otherwise caused significant adverse effects on the sensors that measure, for example, the basis weight, ash content, and thickness of the moving sheet, are eliminated.