Small stationery, big science

So why can the eraser erase the pencil? The secret is hidden in the relationship between graphite particles and paper. When a pencil is used to write on paper, the graphite powder appears in a state of adhering to the surface of the paper (13 pages). At this time, the graphite particles can be peeled off from the paper by gentle rubbing, thereby removing the words on the paper. But if it is just rubbing, it can't completely eliminate the word, it will only make the powder spread, and a black stain will appear.

The principle of the eraser is actually rubbing the graphite powder into the rubber by friction, and the graphite powder is mixed in the eraser scrap. This is the secret that the eraser can erase the pencil. The eraser can erase the secret of the text, the text written on the paper can be erased by the eraser, and the pencil and the ball pen are different. The words written by the pencil, because only the graphite particles are attached to the surface of the paper, it is only necessary to strip the graphite particles attached to the paper; and the words written by the ball pen will penetrate the paper fibers, so the erase will be accompanied by The paper fibers are peeled off together.

The recent eraser is actually made of plastic. Because it is more effective than the eraser to erase the pencil, it is widely loved and widely circulated. In fact, whether it is rubber or plastic, as long as the pencil word can be cleaned, even if the composition is different, it will be called the eraser.

The left page shows the flow of the plastic eraser method. It is very eye-catching to store the finished products individually in a carton. This is because the plastic parts of the eraser are in contact with each other, and recombination occurs. To prevent this from happening, each eraser is separated by a carton package.

It is well known that the text written using ink cannot be erased. This is because the ink is directly dyed into the fibers of the paper, and if you want to eliminate it, you must use a sand eraser. The paper fibers partially stained with ink are partially peeled off by the components of the inner sand of the eraser. However, the correction fluid or correction tape has recently been more convenient and popular.