This type of mixer has been in general use for many year. Two rows of mixing paddles are contained in double U-troughs (Figure 9-12). The pitch of the paddles can be adjusted to control the intensity of the mixing action. This type of mixer is popular in high capacity, continuous-mix feed plants in the mixing of molasses with meal type feeds. With quick-drop bottom doors and spring clamp top cover, easy clean-out is possible (Figure 9-13).