A static mixer (also called a motionless mixer or mixing nozzle) is a simple device with no moving parts, and consists of a series of internal elements (baffles) within a plastic housing (tube).
The static mixer is the central, if not the most important, part of the two-component dispensing system.
Theory of Static Mixing
Elements within the mixer stay “static” i.e. they do not move.
The A & B materials are pushed/pumped/injected into the static mixer in the ratio required. As the two materials move through the series of alternately-angled elements, they are forced to come together and apart, over and over again.
This flow creates layer upon layer of A & B materials. Eventually, the material has been layered so many times, that A & B become a homogeneous stream when they exit the mixer outlet.
Static Mixers optimized for specific fluid types
|Material||Typical # of Elements|
|Acrylic||8 – 20|
|Epoxy||15 – 24|
|Polysulfide||24 – 32|
|PU Foam||10 – 24|
|Silicone||20 – 30|
|Urethane||24 – 36|
|Viscosity Range||Mixing Element Diameter Range|
|Thin < 5,000 cps Thinner than syrup||0.093” – 0.25” (2.36 – 6.35mm)|
|Medium 5,000 – 50,000 cps Thicker than honey, less than ketchup||0.212” – 0.314” (5.4 – 8mm)|
|Thick > 50,000 cps Thicker than ketchup||> 0.366” (9.3mm)|
When mixing fluids of two different viscosities, always use the element rated for the higher viscosity
Each type of outlet delivers specific advantages for specific applications