Low-Pressure Polyurethane Spray Foam System for Particle Distribution
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Solution Overview
Problem
High-pressure polyurethane spray foam systems face issues with uneven distribution and clogging of fire-retardant and conductive particles, leading to inconsistent properties and reduced efficiency in applications requiring high volumes of foam delivery.
Innovation Solution
A low-pressure polyurethane spray foam system utilizing a fluid handling system with separate conduits for isocyanate and polyol streams, heated hoses, and a disposable mixing nozzle with independent air inputs, ensuring consistent mixing and distribution of particles at pressures below 250 psi, allowing for higher volume delivery without clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-pressure systems are used to deliver spray foam, then high volume delivery speed is achieved, but particle distribution becomes uneven and clogging occurs
Solution Approach 1:
The patent changes the pressure parameter from high-pressure to low-pressure operation, delivering foam at pressures below 250 psi. This parameter change prevents particle clogging and promotes uniform particle distribution while maintaining adequate foam delivery volume through optimized low-pressure mixing and delivery system design.
2Productivity
If high-pressure systems are used to deliver spray foam, then high volume delivery speed is achieved, but system complexity increases due to pressurization requirements
Solution Approach 1:
The patent extracts the pressurization function from the foam delivery system, eliminating the need for high-pressure pumps and complex pressurization equipment. By using unpressurized supply sources and achieving foam delivery through low-pressure mixing and atmospheric pressure assistance, the system complexity is significantly reduced while maintaining productivity.
3Manufacturing precision
If low-pressure systems with pressurized containers are used, then particle distribution is improved, but storage and transportation safety risks increase
Solution Approach 1:
The patent inverts the conventional approach by using unpressurized supply sources instead of pressurized containers. This inversion eliminates the safety hazards associated with storing and transporting pressurized chemical containers while achieving uniform particle distribution through low-pressure delivery and optimized mixing chamber design.
4Object-affected harmful factors
If low-pressure systems are used to deliver spray foam, then safety profile is improved, but foam delivery volume is reduced
Solution Approach 1:
The patent creates a low-pressure system that copies the high-volume delivery capability of high-pressure systems through different means. By using large-diameter hoses, optimized mixing chamber geometry, and atmospheric pressure assistance, the system achieves comparable foam delivery volumes to high-pressure systems while maintaining the safety advantages of low-pressure operation.
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 achieves uniform distribution of particles throughout the foam, enhancing fire retardancy and conductivity, and enabling high-volume foam delivery with reduced clogging and improved safety profiles, meeting specifications comparable to high-pressure systems.
Implementation Method 1
The fluid handling system can include a heater configured to heat each of the isocyanate and polyol streams
Implementation Method 2
an air source configured to provide first and second air streams; The disposable mixing nozzle can include independent air inputs configured to receive the first and second air streams from the air source
Data Source
AI summary
Various examples are provided related to polyurethane spray foam and its application. In one example, a method includes providing a system including a polyurethane spray foam (“SPF”) raw material supply, a fluid handling system, an air source, a heated hose, a whip hose, and a metal stray gun. Each of part A and part B material streams, either or both of which include particles, are generated by the system and conveyed by the system through the system and into a disposable mixing nozzle engaged with the metal stray gun. A mixture of the part A and part B material streams can be applied, via the disposable mixing nozzle, to a surface or into a mold at a pressure of 250 psi or less. A polyurethane spray foam coating generated from the method can be applied at a thickness of from about 0.5 inches to about 12 inches.