Structure of ballpoint pen

The writing principle of the ball-point pen is mainly to use the ball to directly contact the paper surface during writing to generate friction, so that the ball rolls in the ball seat, and brings out the ink or ink in the pen core to achieve the purpose of writing.
Ballpoint pen is a pen that uses ink with different pigments. The nib is a small steel ball. The small steel ball is embedded in a small cylindrical copper bowl, and then connected to a plastic tube containing ink. The ink flows down from the surroundings as the steel ball rotates.
The pigment of the ballpoint pen ink is a dye. Ink colors are mainly blue, red and black. Among them, blue ink is the most used. In the past, the pigment components in blue ink were base-based royal blue and base-based green lotus, and the solvents were oxidized castor oil and ricinoleic acid. Because the base dyes are not lightfast (lightfastness is only 1st to 2nd grades), they are not heat-resistant, and they are not resistant to acids and alkalis, so they have poor durability and have been eliminated. market
The "424" blue ball-point pen and "322" black ball-point pen sold on the website have better durability.