Do you know how pencil leads fit into the barrel?

Do you know how pencil leads fit into the barrel?Do you find this process mysterious? In fact, the pencil shaft is indeed made of wood, while the pencil lead is made of graphite and clay mixed in a certain proportion. After thorough mixing and pressing, the lead becomes like a soft clay, and then it is heated and dried and roasted at high temperatures to become hard and hard.

And the production of the pen barrel is not a simple matter. They are not made one by one, but in batches. The logs are cut into boards, hydrothermally treated, and then a planer is used to create a number of neat grooves on the boards. These grooves must be exactly the same size as the pencil lead.

The next crucial step is to apply a layer of glue to the grooved board, then place the pencil lead into the groove one by one, and then cover another grooved board. After 1 8 hours of clamping and heating, the sandwiched boards are cut out to the size of a pencil, and the pencil lead is successfully embedded in the wood.

Finally, refine the lines on these white poles, and the pencil you are familiar with is born. After reading this, do you have a deeper understanding of the pencil making process?