Pencils have gone through the labor of those people

Pencils are made through the labor of tree planters, carpenters, lead miners, glue workers, and pencil factory workers, so we must cherish pencils and discard them only after they are used thoroughly, and we cannot waste the fruits of workers' labor.

Pencil is a kind of pen used for writing and painting, mainly made of graphite as the refill (except for colored pencils) and a wooden rod as the outer layer, and an eraser is attached to the end to erase the handwriting.

Origin:

In 1662, the world's first pencil factory, the Shidellou Pencil Factory, was built in Nuremberg, Germany. Later, the German F. Kast founded the Fabo Karst Graphite Pencil Factory in Nuremberg, using sulfur, antimony and other binders to heat and mix with graphite to make lead cores, which made a big step forward in the manufacturing technology of graphite pencil shafts.

For the first time, N.J. Kant of France used the method of washing graphite to improve the purity of graphite, and used clay to bond graphite into a refill, which is known as Kant's method. The foundation was laid for the pencil industry. Later, after trial and error, French chemist Comte switched to clay as a hardener, resulting in a more durable and wear-resistant refill than before, and this method is suitable for any graphite mine, and is still in use until 2019.

There is a carpenter named William Monroe in the United States, who made the world's first pencil shaft by inserting a black lead core in a wooden strip carved with grooves, and then gluing the two wooden strips together in pairs.

Pencils and pencils will go through the labor of many people.

Pencils go through molding, offset printing, assembly and other processes.

The pencil is divided into two parts: the pencil cap and the pencil shaft, and the pencil cap is mainly made of polyester material, and the production process can be divided into molding, offset printing, assembly and other processes to complete it.

Pencil board processing dissolves and cuts the logs, splits them into wooden blocks with square saws, and cuts them into pencil boards through a board cutter after hydrothermal treatment. Lead core processing graphite lead core is made of graphite and clay in a certain proportion, after mixing by kneading machine and three-roller machine.

The lead core of a certain size is extruded by the core presser, heated and dried and roasted at high temperature to make it have a certain mechanical strength and hardness, and finally made by oil immersion treatment.

The pencil board is planed into a groove board with a thickness of thickness and a core groove that is suitable for the diameter of the lead core of the piercing beam, and then the lead core and the pencil board are glued together with a glue, heated and dried for 1 8 hours in the clamping state, and then processed by the planer machine to make a white pencil with a length of 178 180mm.

Exterior decoration processing: The white rod pencil is painted and printed for decoration, as well as cutting, printing trademarks, filling eraser heads, pen caps, etc., so as to make it a finished pencil with certain specifications, appearance colors and patterns.

In fact, the pencil lead is not poisonous, the lead is toxic, and the main raw materials for the manufacture of the pencil lead are graphite and clay, so the pencil lead is non-toxic. The main components of the lead of the pencil are graphite and clay, which is a solid with a metallic luster in the form of scales.

Among them, there are carbon-carbon chemical bonds, between the layers is van der Waals force, carbon-carbon chemical bonds are very stable, it is very difficult to break, which is why diamond and graphite are composed of carbon, but the physical properties are very different, there is nothing in the human body that can break the carbon-carbon chemical bonds, so it is certain that the pencil lead is safe.

Workers cut down trees.

The vehicle is transported to the factory.

Factory processing. Use a machine to turn it into a suitable size, use a planer to plane into the basic shape of a pencil, split it in half, make a suitable position for the refill, load the refill with a suitable liquid ruler, and re-fix the paint. Debaters.

What kind of labor does the pencil go through to make it, the process is as follows:

The pencil is divided into two parts: the "pencil cap" and the "pen barrel".

The main material of the pencil cap is "polyester material", and the production process can be divided into molding, offset printing, assembly and other processes.

To make the pen barrel, first of all, graphite and clay are matched in a certain proportion. Through extrusion, high-temperature roasting, etc., it has a certain mechanical strength and hardness.

Finally, it is loaded into a softened and easy-to-roll barrel, and its appearance is painted and printed to make it beautiful.

Through the wood and the elves of the same country.