Proportional Dampening Valve Pulsing to Prevent Web Nozzle Clogging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dampening devices for material webs, such as paper or cardboard, face challenges in achieving precise control and uniformity due to clogging from deposits and contamination, particularly with conventional proportional valves, which are prone to slow adjustments and quality issues from moisture fluctuations.
Innovation Solution
A method utilizing a proportional valve with an electromagnetic force transmitter and a reset force transmitter, allowing for rapid and precise control of the application volume through pulsing, which loosens deposits and minimizes contamination, and includes a cleaning cycle with a control unit operating at high frequencies to maintain target values with minimal deviation, eliminating the need for additional damping elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional proportional valves are used for dampening control, then precise control of application volume is achieved, but the valve is prone to clogging from deposits and contamination
Solution Approach 1:
The patent implements periodic pulsation cycles where the proportional valve rapidly opens and closes at controlled intervals. This periodic action creates high-velocity fluid flow that prevents deposits from accumulating and clogging the valve, while still achieving precise dampening control through the control unit's ability to modulate the pulsation duty cycle
Solution Approach 2:
The rapid opening and closing of the proportional valve during pulsation cycles generates mechanical vibrations in the fluid stream. These vibrations help prevent deposit accumulation on valve surfaces and maintain reliable operation, while the control unit regulates the overall application volume through pulsation timing
2Reliability
If pulsation valves are used for dampening, then clogging is minimized through high-speed operation, but additional damping elements are required to compensate for fluctuations in application rate
Solution Approach 1:
The control unit monitors the dampening application rate and adjusts the pulsation valve timing and duty cycle in real-time to compensate for fluctuations. This feedback control eliminates the need for additional passive damping elements while maintaining reliable high-speed operation and preventing clogging
Solution Approach 2:
The control unit automatically regulates the pulsation parameters to maintain consistent application rate without requiring external damping components. The system self-adjusts the pulsation cycle timing and duration to compensate for inherent flow fluctuations, simplifying the overall device configuration
3Measurement precision
If proportional valves operate slowly for precise control, then accurate dampening is achieved, but rapid adjustment of moisture levels cannot be ensured
Solution Approach 1:
The control unit implements periodic pulsation cycles with rapid valve switching that enables both precise dampening control and fast response. By modulating the pulsation duty cycle and frequency, the system achieves accurate moisture application while responding rapidly to changing dampening requirements
Solution Approach 2:
The system transitions from static proportional control to dynamic pulsation control, where the valve rapidly switches between open and closed states. This dynamic approach maintains precise average flow control through duty cycle modulation while enabling rapid adjustment responses to moisture level changes
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 solution enables precise and uniform dampening of material webs by preventing clogging, ensuring rapid adjustments to moisture levels, and improving paper quality by maintaining consistent application volumes with reduced wear and contamination, thus overcoming the limitations of traditional pulsation and proportional valves.
Implementation Method 1
at least one electromagnetic force transmitter (3)
Implementation Method 2
the proportional valve pulses about the set target value
Data Source
AI summary
A method for at least one of regulating and controlling at least one dampening device suitable for dampening a material web, the method comprising the steps of: providing that the dampening device includes a valve which includes at least one electromagnetic force transmitter, a reset force transmitter, a valve body, the dampening device further including a control unit and an application nozzle; and performing, by the dampening device, a cleaning cycle, the valve being a proportional valve, the proportional valve pulsing about a set target value, a deviation from the set target value occurring by way of a timing such that the deviation from the set target value results, the deviation being at least one of a positive deviation and a negative deviation.