Komax

United Kingdom

See product on komax.com

The patented geometry is very simple, yet L/H units are highly successful and applied world-wide to many in-line mixing problems in pipe sizes from 1" through 24". The L/H unit is used to introduce a very small amount of a low viscosity additive into a much higher viscosity melt stream. It consists of a cylindrical block of metal having a pair of identical holes bored parallel to the axis. These holes are just slightly smaller in diameter than the main pipe diameter D. Tapered inlet and outlets are provided. The low viscosity additive is introduced to the structure at

the point where the two holes are substantially tangent. As the high viscosity material exits the two holes, natural hydraulic forces cause the material to occupy the entire pipe cross section. These forces are generated by downstream forming dies, static mixers, screen changers, etc. Each exiting stream is forced to form into a "D" shape to fill the pipe. The additive entering between the two flows has no option but to form into a thin sheet across the pipe diameter. It can be shown that if "F" is the additive fraction where F = 0.01 for 1% then the A/t value for the L/H unit is 8/p 2F. In other words if F = 0.01 or 1%, then A/t = 81. This is clearly a big improvement over the value of p we get for a simple T inlet.
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