What is the eraser made of? How to make an eraser

95% of the products on the market are PVC (polyvinyl chloride) erasers, and each PVC eraser contains about 20% DEHP (diethylhexyl phthalate).

Nowadays, there are many types of erasers to meet different needs, including ordinary incense erasers, 2b, 4b, 6b and other models of art erasers for painting, as well as plastic erasers. Eraser: Some pencils have a small eraser at the end. These erasers are mostly pink in color and have a smooth gummy surface.

They perform well in most situations, but they can sometimes break the paper. If you put too much pressure on it, the eraser has a chance to break the paper. When the handwriting is erased, the eraser leaves residue on the paper. If not cleaned up properly, these residues can leave marks on the paper.

When you don't have an eraser, you can choose to use bread crumbs, rubber, tape, correction fluid, etc. instead of an eraser, although the effect is not as good as an eraser, but it can still be emergency.

Before using an eraser, people used breadcrumbs to erase handwriting, because the friction of breadcrumbs on the paper can remove the handwriting on the paper, but the effect is not as good as that of an eraser.

Pencil leads are made of graphite and clay and adhere easily to paper. The eraser is very soft and has a lot of friction, which can rub the handwriting off the paper and will not damage the surface of the paper if used properly.

Rubber can also erase pencil handwriting, but the rubber itself can be a bit hard and can rub the paper if used incorrectly.

The correction solution is generally used to correct the handwriting of a ballpoint pen by covering the white pigment in the correction solution on the paper, and writing on it after the surface is dry. Correction fluid can also be used with a pencil.

What is an eraser used for?

The eraser can erase the handwriting written by the pencil and wipe it cleanly, and it can also be wiped repeatedly on a blank piece of paper, as long as it is used with the right amount of force, it will not damage the surface of the paper.

The eraser making process is as follows:

1. The petroleum processing plant transports the powder or liquid synthetic rubber to the rubber manufacturing plant. If natural rubber is to be used, it is a sturdy chunk that must be crushed and dissolved by the workers first. Rubber is mixed with ground pumice powder, iron oxides, vegetable oil, sulfur and other substances.

Heating the mixture causes the sulfur to mix with the rubber to increase the strength of the rubber and make it more durable.

2. The soft, still hot raw material is fed into the press to make a long and thin rubber stick. Use a knife to cut the rubber stick into small pieces, wait for it to cool, and then transport it to the pencil factory to make an eraser on the pencil. Block erasers, which are used alone, are made by injecting a heated rubber mixture into molds of various shapes.

Wait until it cools, open the mold, and the erasers of various shapes come out.

Eraser

An eraser is a tool used to erase marks of pencil writing. In general, the eraser is made of polyvinyl chloride softened and plasticizer added, but now it is made of elastomer, a plastic plastic styrene that does not damage the environment. The eraser was first invented by a British scientist and has since been continuously improved, and today erasers can easily erase pencil handwriting without staining paper.

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.

Here's how to make an eraser:

The rubber is first mixed with ground pumice powder, iron oxide, vegetable oil, sulfur and other substances. The mixture is heated so that the sulfur mixes with the rubber to increase the strength of the rubber and make it more durable. The soft, still hot raw material is then fed into a press or injected into a mold of various shapes, and when it cools, the mold is opened and the erasers of various shapes come out.

Erasers were first discovered by the British scientist Priest in 1770. It is mainly made of PVC material, which also adds plasticizer, also known as trin-butyl acetrate, which is a non-toxic plasticizer with strong solubility, good oil resistance, light resistance, and mildew resistance.

It is mainly used as a plasticizer for polyvinyl chloride, cellulose resin, vinyl resin and synthetic rubber. ATBC is currently the most economical environmentally friendly plasticizer in the PVC plastic industry.

There are several types of erasers:

1. Combined with the pencil, it is located at the end of the pencil. The advantage is that it is easy to use, and the disadvantage is that if you use it too hard, it is easy to break the surface of the paper. And when the handwriting is erased, the eraser leaves residue on the paper. Stain the paper.

2. Brown eraser, made of soft and rough rubber. The advantage is that large areas can be erased without breaking the paper. The disadvantage is that it does not erase handwriting very effectively and accurately.

3. Soft rubber, made of a gray material, and oak with gum. The advantage is that it does not leave residue on the paper and lasts longer than other erasers. The disadvantage is that it is not easy to remove large areas of handwriting, and if the eraser is excessively heated, it can easily smudge or even stick to the paper.

4. Aromatic eraser, add a volatile oil in the process of remanufacturing eraser. The advantage is that the eraser can carry a variety of nice odors. The disadvantage is that if the plastic and the eraser are left together for a long time, the organic solvent volatilized by the eraser can dissolve the plastic in small amounts.

Different eraser types are suitable for different groups of people.

The pencil lead is graphite, layered structure, easy to peel off between layers, layered graphite adheres to the surface of paper fibers, rubber macromolecules and graphite van der Waals force is larger than paper fibers, and takes the graphite away.

The ballpoint pen is written on the paper and so dry, the ink penetrates into the paper fiber to dye the color, unless the eraser is hard to rub off the dyed paper fiber or can not be erased, so the pen eraser is so hard is used to scrape the paper.

Erasers can erase pencil words and were first discovered by the English scientist Priest in 1770. 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.