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Motionless Mixer
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The most common motionless mixer for reactive resin systems features a series
of alternating right- and left-hand helical elements oriented at 90° to one
another. These mixers have no moving parts and are available in a wide variety
of sizes.
They operate on the principle that the main stream of "A" and "B" components is
broken up into minor streams. The materials are divided, reoriented, brought
back together, and then the cycle is repeated again and again until the
components are thoroughly mixed.
These mixers are available in all-plastic construction for low cost and
disposability. Others have removable plastic elements in metal housings,
removable metal elements in metal housings and non-removable metal elements in
metal housings. Non-disposable mixers will typically require solvent or base
purging to clean them but are reusable.
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Dynamic Mixer
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These are closed system mixing devices which use high shear to fully mix the
"A" and "B" components. A variety of mixer designs are available with the
pin/blade and helical design being most common. Various size mix chambers and
rotational speeds are offered to accommodate a wide variety of materials and
applications. Solvent and air purging are typically used to flush the reactive
material from the mix chamber.
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Dynamic Mixer-Disposable Elements
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The Paradyne is a two component mix head primarily designed to dynamically
blend difficult to mix low viscosity reactive chemistries, such as polyurethane
elastomers and foams. Each of two metered streams of material is fed to the mix
head.
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Recirculation
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In the recirculation mode, the streams flow through their
respective three-way ball valves and return to the feed tanks thus keeping the
material flowing at all times.
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Dispense
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When a shot of mixed material is desired, the 3 way ball
valves actuate 90degrees to direct the flow into the mouth of the disposable
dynamic mixer. At the same time the motor begins rotating the disposable mixer
at speeds up to 6000 rpm, thus thoroughly blending the two components. At the
end of the shot a patented lift mechanism pulls the mixer motor up with the
disposable mixer attached. This action snuffs back material preventing
dripping. Typically the Paradyne is used for flow rates up to 60 cc/second and
for viscosities under 8,000 cps.
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Impingement Mixer
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These are closed system mixing devices which use high-pressure impingement of
the "A" and "B" components and the resultant turbulence to accomplish a
thorough mixing. Solvent purging is not required as the mixed material is
mechanically purged by a close tolerance rod. A wide variety of sizes are
available to handle various flow rate requirements.
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Dispensing Technologies
