The writing principle of the ballpoint pen is mainly to use the direct contact between the ball and the paper surface to generate friction when writing, so that the ball rolls in the ball seat, and the ink or ink in the refill is brought out to achieve the purpose of writing.
A ballpoint pen is a pen that writes with ink and different pigments. The nib of the pen is a small steel ball. The small steel ball is embedded in a small cylindrical copper bowl, and then connected to a plastic tube filled with ink. The ink flows down with the rotation of the steel ball.
The pigments in ballpoint pen inks are dyes. Ink colors are mainly blue, red and black, among which blue ink is the most used. In the past, the pigment components in blue ink were salt-based royal blue and salt-based blue lotus, and the solvent was oxidized castor oil and ricinoleic acid. Because the basic dyes are not light fast (light fastness is only grade 1-2), not heat resistant, not acid and alkali resistant, so the durability is poor and has been eliminated.
The "424" blue ballpoint pen and "322" black ballpoint pen sold on the market have better handwriting durability. There are frequent reports that scented ballpoint pens are poisonous. The volatile organic compounds contained in inferior scented stationery are toxic and cause certain damage to the human body; however, there have been no incidents of poisoning caused by the normal use of oil-based ballpoint pens without volatile organic compounds.
The main structure of the ballpoint pen is the upper and lower tooth columns, the upper tooth column is pressed by hand, and the lower tooth column can be rotated inside. The meshing of the upper and lower tooth columns is incomplete, only the tip of the tooth is partially engaged, and the guide ribs behind the two engaged teeth are designed to slide in the same guide groove, and the lower tooth column is pushed down by the upper tooth column. After the groove, due to the action of the spring, the teeth of the lower tooth column will slide along the inclined surface of the teeth of the meshing upper tooth column, so that under the action of the inclined surface, the lower tooth column will turn an angle and slide to the other side Go, it is pressed down, and the function of the ballpoint pen can be realized by repeating this.
