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reached, the mixer shuts off. The mixer is a self-cleaning machine, but additional cleaning operations are needed
if work is switched to feed of a highly contrasting color. The Helimat is a batch mixer, with short operational
cycles (50 to 150 sec). An automatic coupling and brake are installed between the electric motor and agitator
shaft to bring the mixer to a rapid stop.
Helimat Technical Data
Geometric volume of mixing chamber,
liters 1.2
Weight of charge, kg 1.5
Installed drive power, kW 11
Total weight, kg 700
25 80 250
3-5 9-10 40-50
30 90-110 250-350
1650 3650 7980
Clearly, the Helimat mixers use up quite a lot of metal and power.
The high-speed Drais,Disperserdisk mixer, also exhibited by Drais, features stepless rpm control from 850 to
1150 rpm (Fig. 2), and is designed for mixing, dispersion, and dissolution. Dispersion is achieved by the use of spec-
ial teeth cut around the annular edge of the rapidly rotating disk. Mixing is achieved by circulating the process
liquor through axial and radial pumping effects. The rotor part of the agitator assembly can be rotated in the hor-
izontal plane and can be moved up and down, for convenience in servicing and operation. The agitators are de-
signed for service at atmospheric pressure and in vacuum. The installed power rating ranges from 37 to 45 kW.
Werner-Pfleiderer exhibited the continuous PK 400 mixer (Fig. 3) designed for plasticizing soft polyvinyl
chloride compositions. This machine consists of a conical rotor rotating in a fixed shell, a pair of screw feeders, an
expeller screw, a granulating perforated disk with cutting wheel, and a power drive. The conical rotor is fluted to
intensify the internal mixing effect, and improve the passage of the material in the direction of the expeller screw.
The clearance between rotor and shell is kept within 0.3 to 4 mm. Given the insignificant thickness of the process
mass layer, the polymer subjected to heavy shear stresses becomes rapidly and uniformly heated, thereby under-
going plastication and homogenization. The material is premixed before entering the mixer.