Vocabulary

roll mill валковий млин

batch production серійне виробництво

supply постачати

cradle подається

knead and fold місити та складати

feed bar рухома щока

crush роздавлювати

shear різати

abbrasion розтирання, подрібнення

wipе розтирати

agglomerates накопичення

change-can зі змінним сосудом

preliminary dispersion попереднє розсіювання

grinder bar щока дробарки

hardened roll прокатний валок

nip entrance отвір захвату, зажиму

dense media густе середовище

Test

1. Match the titles to the parts of the text:

1). The single-roll mill.

2). Roll mills.

3). Two-roll mills.

A	B	C

2. Match the notions to their definitions:

1. The single-roll mill				a) may be used for preliminary dispersion.
2. Two-roll mills				b) con­tains a wide-faced grinder bar working against a smooth hardened roll.
3. Roll mills				c) contain two parallel rolls mounted in a heavy frame with provision for accurately regulating the pressure and distance between the rolls.
4. Change-can mixers				d)may contain one, two, or three rolls and can be arranged for either batch or continuous production.

1	2	3	4

3). What statements are true or false:

1. Roll mills may contain two, or three rolls.

2. Between the roll and the feed bar the material is subjected to crushing, shearing, and abrasion.

3. Liquid must be provided to wet the constantly decreasing surface of the dispersed mate­rial.

4. It is necessary to lubricate the particles.

5. The feed to the mill must not be uni­form.

1	2	3	4	5

4. Choose the right statement:

1. The single-roll mill con­tains … .

a) two blades,

b) a wide-faced grinder bar,

c) two rolls.

2. There is less crushing in the single-roll mill … .

a) than in a two-roll mill,

b) because of the capacity,

c) because of the grinder.

3. Accordingly, single-roll mills … .

a) are best for little quantities,

b) are best considered for dispersion rather than grinding,

c) are not so powerful as two-roll mills.