VII. Complete sentences by matching the parts in a with parts in b .

A B

1. Dried lumber has many advantages … a) must be dried from 6% to 8%

2. Before glueing wooden parts together … of moisture content

3. Wood stain can result from … b) kills fungi and insects

4. Hardwood lumber to be used for furniture … c) trucks are rolled in and out

5. Higher temperatures and faster air of the kiln on tracks

circulation in the kiln … d) the lumber does not travel

6. Kiln drying of wood … progressively in the kiln

during the drying process

7. In the batch drying process … e) by venting humid air out of

the kiln

8. In the track-type kilns …

9. In some types of kiln water is removed … f) over green lumber

10. Temperature and relative humidity g) slower drying of wood in

in the kiln are changed … the kiln

h) according to a prescribed

schedule of drying

i) can increase drying rate of

wood greatly

j) they must be properly dried.

VIII. Periphrase the underlined parts of the sentences using the words from the

list.

Reduced, advances, preserved, additional and not wanted,

worked, discharge, movement of air around, becoming higher,

must be the same, within the wide limits, change with, in every part of

1. Wood drying means removing the excess water from the wood.

2. Dried wood can be cut and machined more easily and effectively.

3. In progressive kilns the lumber moves progressively from one end to the other.

4. Finishes such as paint and varnish are better maintained on dried wood.

5. Forced air circulation is used in all types of kilns.

6. Some common types of kiln do not vent humid air from the kiln.

7. In most kiln drying schedules, the temperature is gradually increased and

the relative humidity decreased.

8. Drying schedules vary by species and thickness of the lumber.

9. Temperature and relative humidity are kept as uniform as possible throughout

the kiln.

10. Temperatures can be controlled over a wide range.

IX. Decide if the following statements are true or false. Correct the false ones.

1. Strength properties in green wood are better than in dried wood.

2. When drying lumber in kilns, we must control only the temperature, relative

humidity is not important.

3. Air pre-drying of lumber reduces the period of time needed for the lumber to be

properly dried in the kiln.

4. In progressive kilns, lumber progressively moves, it does not remain stationary

in the kiln.

5. The choice of kiln drying schedules depends on various factors such as species

and end use of lumber.

6. In dehumidification kilns, humid air is vended out of the kiln to remove water.

7. In the track-type kiln, lumber is loaded in the kiln by a fork-loader.

8. Forced air circulation in kilns is done by means of dehumidifier coils.

9. Veneer is usually dried in batch kilns.

10. Rapid drying of lumber in kilns requires the use of temperatures as low as

possible and relative humidities as high as possible.