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

2. State whether the following statements are true or false and comment on them.

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.

3. Complete the sentences.

1.The single-roll mill con­tains ____. 3. There is less crushing in the single-roll mill ____. 4. Accordingly, single-roll mills ____. 5. Also, they cannot ____.

6. Two-roll mills contain ____. 7. Separatory-vessels are used ____. 8. The latter include ____.

4. Ask question on the text.

5. Find in the text the equivalents of the Ukrainian words and

expressions.

розмелювати (2), місити, забезпечувати, постійно зростати, змащувати деталі, проходити (пропускати) через млин, підлягати подрібненню, тонка плівка, твердий / рідкий / сухий / вологий матеріал, режим змішування, гвинт, передача енергії, потік рідини, містити, накачувати насосом, накопичуватися, ефективно працювати з матеріалом, висока в’язкість, призначений для, змінити склад продукту, цистерна, однороловий млин, тягнути (2).

6. Fill in the blanks.

vehicle, considered, dispersed, grinder bar, lubricate, rubbing, feed, shearing, abrasion, crushing, nipped, kneaded, supply, batch.

Roll mills may contain one, two, or three rolls and can be arranged for either ____ or continuous production. The ____of material is cradled

between the rolls or between the roll and a feed bar, where it is ____ and

folded. Part of the material is ____ and continuously drawn down between the

rolls or between the roll and the ____bar where it is subjected to ____, ___,___. This action calls for the proper formulation as sufficient liquid must be provided to wet the constantly increasing surface of the ____ mate­rial. This is

necessary both to ____ the particles as they pass through the mill and to avoid the formation of new agglomerates. Since all the broken or dispersed particles in the thin film must be immediately surrounded with a film of ____, the feed to the mill must be uni­form and not contain lumps of dry material. The single-roll mill con­tains a wide-faced ____ working against a smooth hardened roll. The larger contact area of the ____bar and the roll gives more hydraulic shear than in two- or three-roll mills. Accordingly, single-roll mills are best ____ for dispersion rather than grinding. Also, they cannot efficiently handle

materials of a wide range of viscosity.

7. Define the notions.

dispersion, abbrasion, agglomerate, preliminary, media, viscosity.

8. Group the synonyms and use them in situations

constant, speed, damp, mill, fix, grease, various, draw, fluid, enterprise, item, numerous, knead, treat, be composed of, accumulations, receive, revolve, liquid, equipment, permanent, pull, mount, velosity, provide, mix, include, lubricate, process, ready, feed, grind, oil, construct, continuous, addition, wet, principal, turn, agglomerates, consist of, obtain.

9. Group the antonyms.

low den­sity, internal, inner, intensively, timely, high density, external, extensively, continuous.

10. A. Define the word with the same root and use them in situations.

mix – mixer – mixing – mixed, revolve – revolving – revolution – revolver, design – designer – designing, construct – construction – constructor –

constructive, agitate – agitation – agitator.

11. A. Use the Gerund to describe the milling operations.

Model. The material is subject to processing.

mill, treat, mix, knead, fold, nip, draw, crush, shear, abrase, disperse,

grind, blend, press, wip, separate.

B. Use the gerund as well as the connective words below to make contradiction or agreement about the useful properties of mills as the domestic technoque.

aside from, apart from, except from, for the exception of, along with, together with, besides, it should be / have, I would