WLDH Horizontal Ribbon Mixer Descriptions The WLDH horizontal ribbon mixer is the flagship mixing machine of our ribbon series, engineered for fast, uniform blending of powders, granules and other dry materials. Its horizontal trough and counter-flowing inner and outer ribbons fold the material continuously to form a convection mix, producing a homogeneous blend in only a few minutes. Available from 100L to 10000L, the WLDH series covers laboratory, pilot and full production