Polyurethane Foam Dispensing Control Valve Flow Rate
Solution Overview
Problem
Existing polyurethane foam dispensing systems face challenges in achieving high flow rates while maintaining a compact and cost-effective design, as low pressure systems are inefficient and high pressure systems are large and expensive.
Innovation Solution
A method using a control valve with a housing and flow control device to regulate the flow rate of resin and isocyanate components, pressurized by gas pressure, achieving flow rates between 5 and 70 gallons per minute with small and inexpensive equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a low pressure system is used to pressurize the tanks and foam dispensing apparatus, then the equipment remains small and inexpensive, but the flow rate of polyurethane foam dispensed is relatively low
Solution Approach 1:
The system divides the pressurization function into two separate components: a gas pressure system for pressurization and a flow control valve for flow regulation. This segmentation allows the use of a simple, small, inexpensive gas pressure system while achieving high flow rates through the flow control valve's ability to precisely control the mixing ratio and flow rate of components.
Solution Approach 2:
The flow control valve acts as an intermediary device between the pressurization system and the foam dispensing process. It receives pressurized components from the gas pressure system and precisely controls their flow rates and mixing ratios, enabling high productivity without requiring a complex high-pressure system.
2Productivity
If a high pressure system is used to increase the flow rate of resin and isocyanate components, then the flow rate increases to 8-100 gpm, but the system becomes large and expensive with large pumps and thick pipes
Solution Approach 1:
The system separates the pressurization function (handled by a simple gas pressure system) from the flow control function (handled by the flow control valve). This allows achieving high flow rates without the need for large pumps and thick pipes associated with high-pressure systems, as the flow control valve precisely regulates component flow at lower pressures.
Solution Approach 2:
The flow control valve changes the flow rate parameter precisely by controlling the mixing ratio of resin and isocyanate components. This allows the system to achieve variable high flow rates (5-70 gpm) without requiring a high-pressure system, as the flow control is achieved through ratio control rather than pressure increase.
3Loss of time
If the flow rate of resin and isocyanate components is increased, then the time to dispense a given amount of polyurethane foam decreases, but the equipment becomes more complex and expensive
Solution Approach 1:
The system divides the flow control function into a flow control valve that precisely regulates the flow rates of resin and isocyanate components. This allows rapid dispensing (reduced time) while maintaining a simple, small, inexpensive gas pressure system, as the flow control valve handles the precision control without requiring complex high-pressure equipment.
Solution Approach 2:
The flow control valve incorporates feedback mechanisms to precisely control the mixing ratio and flow rates of components. This ensures consistent, rapid dispensing performance while maintaining equipment simplicity, as the feedback control allows efficient operation without over-engineering the pressurization system.
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 method provides a versatile flow rate range suitable for various applications, maintaining a small and inexpensive equipment setup while achieving high flow rates comparable to large and expensive systems.
Implementation Method 1
pressurizing the at least one of the resin component and the isocyanate component with the source of gas pressure to move the at least one of the resin component and the isocyanate component through the line
Data Source
AI summary
A method of forming polyurethane foam from a resin component and an isocyanate component includes the use of at least one control valve controlling a flow rate of at least one of the resin component and the isocyanate component. The method includes connecting lines having at least a 1 inch diameter to a housing of the control valve. The method also includes coupling a source of gas pressure to the line. At least one of the resin component and the isocyanate component is pressurized with the source of gas pressure to move the resin and/or isocyanate component through the line and into the flow control device at a flow rate of between 5 and 70 gallons per minute.