The liner diagram illustrates the process and the materials and the equipment used in the production of a lead pencil.

The liner diagram shows the procedure and raw materials and machine tools used in the production of a lead pencil. In general , the visual indicates that the mechanism of production involves several stages starting from planting the

trees

to the outcome of the final product. To start with, the main material in the process which is the wood is gained from sowing the seeds, and 4 months later ,the seedlings are replanted in another area ,

while

, after 3 years the

trees

are thinned and left for 14 years. Once the

trees

mature enough, they are cut and transferred to the factory where the

trees

are cut into thin sheets are treated with specific material . The next stage starts after 60 days and involves carving grooves in the wood sheet and adding glue

then

the black lead strips are placed in the grooves covered with other grooved slats and sandwiched, After that by hard pressure with heat the sandwich is hard-pressed and fixed hardly together ,only

then

, the pencils are cut out . In the

last

stage, the pencils are painted with different colours , sharpened , stamped and packaged.

Finally

, the pencils are sent out to shops.