Mixing

Normally, 2-6% perfume, colour, skin protecting agents and other additions are to be mixed as equally as possible with the dried base soap formed as noodles or chips.

In case of throughputs up to 2,000 kg/hr, discontinuous mixers are economic where a time of 6-15 minutes is needed for each batch and the material is mixed in a mixing trough by rotating mixing arms.

For normal mixture of toilet soaps SELA TM-B mixers with one mixer shaft are used. The mixer is emptied through an outlet in the bottom that can be opened or closed by motor.

In case of base soap noodles with high bulk density and great share of liquid or pasty additions a kneading effect is necessary additionally. For this, SELA TKH kneaders with two kneading elements are used. This system is emptied by tilting the trough.

At discontinuous operation, for batch-wise preparation of the mixing rates a weighing system is necessary for feeding the mixer with soap.

Continuous mixers are working according to the principle of the worm press and are suitable especially for big capacities from 1,000 kg soap/hr on. The additions must be easy to dose and are fed automatically as liquid by means of a proportioning pump. Continuous mixers are worm presses with a dosing equipment. They can be constructed as Duplex worm press so that there is a refining stage following the mixing stage. In that way, an additional refining effect can be obtained in one machine with relative low costs.