Both ballpoint pens and pens can be used in the third grade.
These two kinds of pens can be erased without mistakes like pencils. When using ballpoint pens and pens, you need to be more careful so as not to make mistakes. Although there are correction tapes and correction fluids, they all contain harmful substances, so it is recommended to use them less.
However, there are still erasable pens, which can be used as a transition from pencils to ballpoint pens, and are suitable for some students with poor writing. It is best not to use ballpoint pens that are fragrant or brightly colored, which is not good for children's health.
common sense
1. This pen is more durable than ordinary pens, but if it is not properly used and kept, it is often impossible to write words, mainly because the dry ink sticks around the steel ball to prevent the ink from flowing out. Ink is a kind of viscous oil, which is made of linseed oil, synthetic pine nut oil (mainly containing terpineol substances), mineral oil (oil obtained by fractionating minerals such as petroleum), hard rubber and lampblack.
2. When using a ballpoint pen, don't write on the paper with oil and wax, otherwise the oil and wax will be embedded in the copper bowl along the edge of the steel ball, which will affect the ink output and prevent the pen from writing. Also, avoid the impact and exposure of the pen, and wear the cap with gloves when not in use, so as to prevent the pen tip and pen holder from being damaged and the refill from leaking oil and polluting objects. If it is cold or left unused for a long time. When the pen is out of oil, you can put the pen tip in warm water for a while and then stroke the pen tip on the paper to write words.
3. The ballpoint pen has a big disadvantage: the handwriting it writes is very clear at first; But it can't stand the test of time. After a long time, the handwriting will gradually blur. This is because the ink of ballpoint pen is made of dye and castor oil. Unlike water, oil is not easy to dry. After a long time, the oil will slowly soak on the paper and the handwriting will become blurred.
4. If the pen tip touches the ground at 9 degrees, the pen tip of the ballpoint pen will not be damaged. However, if it is damaged at the closing position, it will cause the phenomenon of "oil leakage" at this gap, and in severe cases, the ball will fall off and there will be writing difficulties.