Low pressure plural component spray system and foams generated therefrom

A method for delivering plural component material from a static mixing nozzle at pressures of less than 300 pounds per square inch (“psi”) comprising:

• a. providing a spray gun configured for dispensing a plural component material from a distal end of a static mixing nozzle engaged at a barrel end of the spray gun, wherein:
• i. the spray gun is configured with each of a part A materials conduit, a part B materials conduit, and an air conduit, wherein each conduit extends a length of the spray gun to a spray gun face configured on an interior of an end of the spray gun, wherein the spray gun face is configured with openings for conveyance of each of part A material, part B material, and air;
• and
• ii. the spray gun air conduit is operational to allow the air to flow through the spray gun into the static mixing nozzle when the part A and part B materials are both being conveyed through the respective spray gun part A and part B materials conduits and when the part A and part B materials are not being conveyed through the respective spray gun part A and part B materials conduits, wherein the air is provided from an air compressor in communication with the air conduit;
• b. conveying the part A and part B materials from their respective unpressurized containers to a proportioner in communications engagement with each container, wherein the proportioner is configured to meter and heat each of the part A and part B materials;
• c. metering and heating each of the part A and part B materials;
• d. conveying each of the metered and heated part A and part B materials from the proportioner to the spray gun via respective part A and part B materials conduits engaged with the proportioner and extending through a heated hose to the respective part A and part B materials conduits on the spray gun;
• e. conveying an amount of air from the air compressor to the spray gun;
• f. conveying each of the part A material, part B material, and air through their respective spray gun conduits to exit the spray gun face into a proximate end of the static mixing nozzle;
• g. combining each of the parts A and parts B materials flowing from their respective spray gun conduits in the presence of the air flowing from the spray gun air conduit in the proximate end of the static mixing nozzle;
• h. conveying the mixed parts A and B and air through the static mixing nozzle;
• and
• i. delivering the plural component material from the distal end of the static mixing nozzle at a pressure of less than 300 psi.