1. Erasing effect: An excellent eraser should have a good erasing effect, which can quickly and thoroughly erase the traces of writing tools such as pencils and pens without leaving dust or stains. For primary school students, mistakes may occur when learning to write, so the erasing effect of eraser is very important for correcting mistakes.
2. Safety: Pupils are younger, and the requirements for the material and composition of erasers are relatively high. Choose a non-toxic, harmless and tasteless eraser to ensure the health and safety of children. High-quality erasers generally pass environmental protection certification and meet relevant national standards.
3. Ease of use: Pupils need to be simple and convenient when using the eraser. Most primary school students have not fully mastered the correct pen holding posture, so the size of the eraser should be suitable for their small hands and easy to control. Some erasers are also made of plastic, which can be adjusted according to the needs to facilitate detailed erasure.
4. Economy: Considering the large number of primary school students, economy is also one of the factors to consider when choosing an eraser. You can choose an eraser with good quality and moderate price, which can save money and meet the needs of use.
Common erasers on the market include several types:
1, Ordinary Eraser: This kind of eraser is the most common and cheap, and it is suitable for general writing and drawing erasure. However, the erasing effect may be poor and it is easy to leave dust.
2. Polymer Eraser: This eraser is soft in texture, with good erasing effect, and will not leave obvious dust. It is usually durable, reusable and relatively safe. Polymer erasers have different colors and shapes to choose from, such as rectangular and cylindrical, which is more convenient for primary school students to use.
3. Sticky eraser: This kind of eraser has a certain stickiness, which can stick the erased residual particles on the eraser to avoid dust flying. Primary school students are easy to use and economical.
Therefore, for primary school students, it is the best choice to choose an eraser with good erasing effect, safety, non-toxicity, convenient use and economical benefits. Parents can choose the appropriate eraser type according to their children's personal preferences and actual needs, and control their own expenses under the premise of ensuring quality. At the same time, it is also important for primary school students to form the habit of using rubber correctly.
The origin of eraser
The origin of eraser can be traced back to1the beginning of the 9th century. As early as ancient times, people used bamboo slips, wooden boards or parchment when writing, so there was no need for an eraser. It was not until the end of 15 that Europe discovered America and started trading that rubber, a new material, was introduced.
People are curious about the properties of rubber and find that it has certain erasing ability. Therefore, people began to try to cut rubber into small pieces to erase ink. However, these early erasers are not as practical as modern erasers. They are sticky, easy to leave residues and have a short life.
With the passage of time, people have improved and innovated the rubber. At the end of 18 and the beginning of 19, British chemist joseph priestley discovered the erasing effect of rubber, and called it "rubber", which came from Latin "Robola", meaning "friction". It can be said that the word "eraser" was first put forward.
By the beginning of the19th century, the British chemist Charles Dickens found that by heating rubber and mixing it with sulfur, and then cooling, rubber can become tougher, not too sticky, and can better erase ink marks. This vulcanized rubber is called vulcanized rubber, and it is also the main raw material of modern eraser.