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Eraser Principle

The white bag, the light sofa or even the walls are dirty. Can not use water to wash, easy to crack, how to do that, specifically for someone to clean and seem to be very trouble, don't try so hard, as long as can do with a small rubber piece, bags, sofa and other leather products can use a rubber to rub, also will not damage the surface, mobile phone shell can also use the eraser oh has many, many places are can use eraser to wipe.

The correct use of

The primary school pupil wiped the wrong word, this want to wipe quick and clean, often is to use rubber dip saliva, then go to wipe, just the contrary, the wrong word erase, the book also rotten. Especially the students who draw pictures, the sketch backlight part, often painted, the painting is tired, painting dirty, at this time, if still repeatedly eraser, even dip saliva, that can be broken!

Correct method, it should be: repeatedly on a piece of blank paper first dry brush, wipe out a lot of "rubber", then put the noodles son gently fell in to erase parts, then wipe gently with the rubber on the face, in a short time, will be clean, and don't damage the paper!!!!

principle

The pencil core is made of graphite and clay. Graphite soft, black, easy to attach to the paper, so can write word. The rubber is very soft, the friction is big, and there is some stickiness. It can be rubbed on paper, it can stick the handwriting on it, and it won't damage the paper surface, so the pencil can be erased by eraser. If you write with a ballpoint pen, ink will penetrate into the paper, and it won't be easy to erase.

history

In 1770 Joseph Priestley, a British scientist, said: "I see a material that is very good for the pencil."

At the time, the whole Europe was using rubber cubes cut into small cubes to erase the handwriting. This material is called an eraser.

Another British engineer, Edward Naime, was credited with inventing the eraser, which also took place in 1770. Before that, people used bread crumbs to erase their handwriting. Naime said he had accidentally picked up a piece of rubber for bread crumbs, but found it worked well, and began producing and selling erasers.

Early eraser is not easy, since raw rubber tends to rot. Until 1839, inventor Charles Goodyear discovered that vulcanization improves the quality of rubber, and erasers become reliable.

A man from the Philadelphia 1858 because the eraser and obtained a patent at the end of the pencil, but then it comes with a pencil eraser because was judged to be "just the two existing embedded together rather than new product" patent were disqualified.

In Britain and Australia, erasers are called rubber. But in the United States, the rubber is one of the common names, and the eraser is the eraser. These are often used by americans to make fun of. Today there are many types of erasers for different needs.

Some pencils have a small eraser at the end. These erasers are mostly pink, and the surface is a smooth gelatin. They perform well on most occasions, but sometimes they also make paper. If the force is too heavy, the eraser will have a chance to break the paper. When the handwriting is erased, the eraser leaves the residue on the paper. If not properly cleaned, the residue will leave marks on the paper.

Another eraser is a brown eraser commonly used by artists, made of soft, rough rubber. Its design is easy to erase the large area of the mark, and will not break the paper. But this eraser does not erase handwriting effectively and accurately.

Another kind of eraser commonly used by artists is called soft eraser. It is mainly caused by a kind of grey material, and it is made of rubber. Its strength does not leave the residue, so its life is longer than other eraser. It removes handwriting by means of "absorbing" graphite. This eraser will not only erase the handwriting (it actually removes the handwriting), but it can also be used to highlight important parts or to make the work more detailed. However, it is not good at removing large areas of handwriting, and if you get too hot you can get dirty and even stick to paper.

Soft polyvinyl rubber eraser has the texture of plastic and has the same function as regular pink eraser. These erasers are softer than pink erasers, so they are less likely to damage paper. The polyethylene rubber eraser is usually white.


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