Group 2 : 1. Jumiyanti

2. Leni Mariana

3. Lindawati

SIZE REDUCTION EQUIPMENT

Size reduction is a process that makes the material became smaller from the

first size. The function of size reduction is for making fibre materials smaller in order

to handle them easily fasting reaction, increasing absorption, and making the

subsequent process easily. There are three kinds of size reduction equipment. They

are crusher, grinder, and mill.

Crusher is equipment that is used to reduce the material in big size. It’s can

to reduce that 0,5 – 3 inch the size of the feed. When we use crusher feed is placed

between two jaws shaped like “V”. One of the jaws (anvil jaw) is assembled almost

vertically and it doesn’t move, the other jaw (swinging jaw) can swing reversibly in

Size Reduction Equipment

Crusher Grinder Mill

- Jaw crusher

-Grytory crusher

-Smooth roll crusher

- Hammer

mill

- Road mill

- Impactor

- Ball mill

- Tube mill

- Classifying mill

- Fluid energy mill

horizontal. Crusher has three kinds. They are Jaw Crusher, Gyratory Crusher and

Smooth Roll Crusher.

Grinder is equipment that is used to reduce the material in medium size. It

can to reduce that 50 – 100 mm the size of the feed. Grinder has a rotor that

rotated with high speed in a casing shaped like cylinder. Feed is placed from the top

of casing and make it broke. And then the feed out from the bottom of the casing.

Grinder has four kinds. They are Hammer Mill, Road Mill, Impactor and Attrition Mill.

Mill is equipment that to use reduction the material in small size. Mill has a

tromol that rotate in the shaft with ball inside the tromol. This machine can to mill

some of particles with the range size from 1 – 2 mµ. Kinds of mill are ball mill, tube

mill, classifying mill, fluid energy mill.