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

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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

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, after 3 years the

trees

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are thinned and left for 14 years. Once the

trees

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

trees

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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

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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

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, the pencils are cut out . In the

last

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

Finally

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, the pencils are sent out to shops.