Why pencil words can be erased with an eraser

If you make a typo and wipe it with an eraser, the typo disappears When I was a kid, I thought it was amazing, but do you know why the eraser erases pencil words?

In fact, the pencil word is a solid powder attached to it under a certain pressure, and when it is wiped with an eraser, it is like sweeping the floor, and the things used can be wiped clean when they are soft, and they can be wiped clean with children's hands. You can try. Just like if there is water on the ground, it is easy to dry it when the water has not penetrated.

It's the same with a pencil, the eraser can't be erased after a long time of writing, some memories and some things can't be erased, molecular movement! The lead of the pencil is graphite and soft, so it adheres easily to the paper, so it can write words. The eraser is very soft and has a lot of friction, and it is a little sticky, and it can be wiped on the paper, which can stick away the handwriting without damaging the paper, so the eraser can erase the pencil words.

But the pencil words can't stand the test of time, and they don't rub back and forth.

The eraser is soft, frictional and somewhat sticky, so the eraser can erase the pencil words.

The eraser can erase pencil words because the eraser adsorbs refill powder.

Principle: The main component of the pencil used in life is graphite, when the pencil is used to write, the lead core of the pencil is crossed by the paper, there will be a fine graphite powder attached to the paper, use the eraser to erase the handwriting written with the pencil, and the graphite powder handwriting on the paper will be attached to the rubber or plastic component of the eraser, so that the pencil words can be erased off by the eraser.

First discovery: The ability of an arubber eraser to erase pencil words was first discovered by British scientist Priest. Before that, people used bread to wipe pencils.

Priest's discovery caused a lot of sensation because it brought great convenience to people. However, the earliest erasers were made of natural rubber, and they did not drop crumbs when erasing words, but just glued the end of the pencil to the eraser, and the more they wiped, the dirtier they became.

Later, substances such as sulfur and oil were added to the eraser, which made the eraser easy to peel off, and the scraped pencil end left the eraser with the debris, so that the eraser could always be kept clean and the paper would not stain.

Type of eraser: Hunger Song

1. Rubber eraser.

Brown, pink, and black special drawing erasers for Zheng Yu 2b, 4b, etc., are basically rubber erasers. The texture is soft and opaque when exposed to strong light sources. One of the more common brands on the market is a Korean brand and a Marley brand.

The comfort and erasing effect is good, but the eraser shavings after erasing are relatively long, and the processing is slightly inconvenient.

2. Plastic eraser.

The eraser commonly used in sketching is a plastic eraser, a soft eraser, which can be freely shaped, and is also the most sensitive and soft oak in the eraser family. Not suitable for everyday writing use.

3. Plastic eraser.

This kind of eraser has a strong plastic texture because it contains polypropylene group. When placed under a strong light source, it will appear translucent. When erased, eraser shavings generally do not form strips, but into small segments or close to granular.

Some of the "flower erasers" on the market for children are essentially plastic erasers and are not recommended, especially for answers.

The eraser erases the pencil lettering, which is a physical phenomenon that changes through the collision and friction of matter, not a chemical reaction, and is not a phenomenon that changes the properties of a substance after a reaction with another substance.

1. Composition and composition of pencils and erasers.

The pencil is composed of a pencil lead and a pen barrel, and the pencil lead plays the main role in writing. The barrel of a pencil can be made of many materials, such as plastic, wood chips, metal, etc., it only serves as a foil and support.

The main raw materials of the pencil lead are graphite and clay, graphite is a solid with a metallic luster in the form of scales, and clay is clay. The pencil core can be distinguished by hardness, which is generally used"h"Indicates a hard pencil"b"Indicates a soft pencil"hb"Indicates a pencil with moderate hardness and softness"f"Indicates a pencil with a hardness between Hb and H.

The soft and hard arrangement of pencils is as follows: 9b, 8b, 7b, 6b, 5b, 4b, 3b, 2b, zhiyan b, hb, f, h, 2h, 3h, 4h, 5h, 6h, 7h, 8h, 9h, 10h, etc.

When writing, the pencil lead comes into contact with the paper, causing friction, and the uneven surface fibers of the paper will scrape off the graphite of the pencil lead, causing it to adhere to the paper, leaving traces.

Erasers are composed of rubber (plastic), sulfur, vegetable oil, gravel, etc. Originally, it was invented in 1770 by engineer Edwardnaime.

The main function of the eraser is to erase pencil marks and correct typos.

Second, the principle of eraser eraser pencil words.

The rubbing of the eraser and the paper will produce a rubber-like thing, which will wrap the graphite powder adhered to the surface of the paper and the paper fibers attached to the graphite powder into the rubber-like thing, and then take them away from the paper, so that the pencil marks on the paper envy search sheet disappear. As a result, the paper that has been erased several times will become thinner and thinner.

In short, the eraser will erase the pencil word, which is a physical process in which the eraser and the paper are in contact with the paper, and the material produced by the friction of the eraser takes away the graphite and fibers on the paper, so that the pencil word disappears.

The eraser erases pencil words because the eraser adsorbs refill powder.

Erasers and pencils are commonly used tools for work and study, which play a great role in our lives. Eraser is a substance made of rubber material, which is mixed with pumice powder, iron oxide, vegetable oil, and other substances, and made by process, of which pumice powder is grinded.

Pencil refills, on the other hand, are made from graphite, which is the softest of the minerals. The key reason why pencil words can be erased by the eraser is that the graphite on the pencil is left on the paper by friction, and the eraser powder rubbed off when the eraser erases the words rolls away the graphite together, and then the pencil handwriting disappears.

The history of eraser:

People use erasers to write words, and it has only a history of more than 200 years. Erasers can erase pencil words and were first discovered by the British scientist Priestley in 1770. Before that, people used breadcrumbs to wipe off pencil words.

Priestley's discovery caused a great sensation because it made it easy for people to bury their sections. However, the first erasers were made of natural rubber.

When erasing words, you don't drop crumbs, but you just stick the pencil end to the eraser, and the more you erase it, the dirtier it gets. Later, substances such as sulfur and oil were added to the eraser to make it, so that the eraser could easily shed chips, and the scraped pencil end left the eraser with the debris, so that the eraser could always be kept clean and would not stain the liquid paper.

The above content refers to Encyclopedia - Eraser.

When you use an eraser to erase the pencil handwriting, the eraser actually absorbs the pencil handwriting (which is made up of pencil powder) written on the paper. As long as you wipe it with an eraser, the pencil handwriting along the "footprint" of the eraser disappears, that is, the adsorption force of the eraser on the pencil powder is greater than the adsorption force of the paper on the pencil powder.

The working principle of the eraser is to use the force between the rubber molecules and other substance molecules, and the eraser itself is soft and does not damage the paper. The eraser is made of PVC material, but with the addition of the plasticizer ATBC. The handwriting is physically stripped of from the substance on the surface of the object being written (excluding correction tape and correction fluid).

Due to the softness and structure of the eraser. In your home life, you can use the eraser to remove some of the stains. For example, the cleaning of a computer's memory module can be wiped with a dry, soft eraser.

Take an eraser and rub it back and forth on the phone case a few times, so that the dirt on the phone case is easy to remove.