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USING AIR MIXERS
IN DRUMS
Whether it is spray foam insulation or polyurea coatings, some systems require mixing of the resin. Most resins are anywhere from 300 centipoise to around 1,000 centipoise but can be as high as 4,000 centipoise. The thicker the resin the tougher it is to get a swirl of material in the drum.
Below are the key elements to successfully mixing* your resin drums:
|| PROPER DIRECTION
There are many styles of drum mixers so you must be aware of inputs and outputs to be sure your mixer is operating in the proper direction. A brand new mixer comes with the muffler and air inlet valve but the unit must be assembled by the customer who has purchased it. If you run air into the mixer through the wrong port, the mixer will operate in the wrong direction.
|| AIR PRESSURE
Air mixers use a lot of air, typically 10-20 CFM at 100 PSI so ensure your compressor is sized correctly. Another potential issue with mixers is water or moisture in the compressed air which can cause your air motor to corrode, be sure to use an air dryer to remove moisture from the compressed air supply.
|| LUBRICATION
Air mixers also need oil in order to get longevity and success out of the unit. Lubricate the agitator air motor by placing 10 to 20 drops of SAE #10 lightweight oil in the air inlet port, the air motor must be manually lubricated every 8 hours. A better option is to use an automatic oiler on the air supply line that is feeding the mixer.
|| BLADE LOCATION
Correct location of the expandable blades on the mixer shaft is paramount to proper performance. Spacing becomes increasingly more important as resin thickness increases. If blades are not spaced correctly, the top material will not be properly mixed with the bottom which can affect installation and performance.
|| SUMMARY
The thicker the resin you are mixing, the more important it is to make sure your mixer is well-maintained and functioning properly. Checking the direction, air pressure, lubrication and paddle placement will assure you the highest mixing performance every time.
* Be sure to check the systems technical data sheet as some materials do not require mixing. Mixing some types of spray foam can lead to loss of blowing agent and frothing of the material.
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