The writing principle of the ballpoint pen mainly uses 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.
A ballpoint pen is a pen that is written with ink and different pigments. The nib is a small steel ball, which is embedded in a small cylindrical copper bowl, and then connected with a plastic tube filled with ink. The ink flows down the steel ball and flows around.
The pigment of the ballpoint pen ink is a dye. The ink colors are mainly blue, red and black, among which blue ink is the most used. In the past, the pigment component in the blue ink was a salt base blue and a salt base, and the solvent was oxidized castor oil and ricinoleic acid. Since the salt-based dyes are not resistant to light (the light resistance is only grade 1 to grade 2), they are not heat-resistant and are not resistant to acid and alkali, so the durability is poor and has been eliminated. The "424" blue ballpoint pen and the "322" black ballpoint pen sold on the market have better handwriting durability.
The toxic report of the scented ballpoint pen is not uncommon. The volatile organic compounds contained in the inferior scented stationery are toxic and have some damage to the human body; however, no incident has been heard of poisoning due to the normal use of an oily ballpoint pen without the addition of volatile organic compounds.