The diagram illustrates the steps and equipment involved in the process of making lead pencils.
Overall, the production has multiple stages starting with planting trees and ending with packaging complete products.
In the first place, seeds are sowed in nurseries before seedlings are replanted four months later. After three years, the plantation is thinned facilitating the growth of the trees and improving the quality of the wood. Once the trees are 14 years old, they are now ready to be used for the manufacturing of pencils and they are chopped down to make logs. The wood obtained is cut into thin pieces, treated to become dry and then left 60 days.
Coming to the next step, a groove is made into the slat and a special glue is injected. After that, a black lead is put into the slat followed by the replacement of an empty slat on top to form a sandwich, which is heated and hard pressed. By this action, the two slats are converted into one piece which is then cut to produce individual pencils. Lead pencils come to the final stages by being painted, sharpened and stamped, after which they are packaged before reaching consumers.