When the pen tip is finished, put the pen tip on the refill and pour the ink. When the ink is full, pour an oil column into it to prevent the ink from flowing out from the back. These interlocking steps are all machined and produced. Of course, after this is completed, the factory will also conduct a circle test. To be qualified, each stroke must meet the due requirements, that is, a line 800 meters long must be drawn. So don't look at a small ballpoint pen, but its manufacturing process is so rigorous and meticulous.
Extended data:
Structure principle of ballpoint pen
The writing principle of ballpoint pen mainly uses the direct contact between the ball and paper to generate friction, which makes the ball roll in the ball seat and bring out the ink or ink in the refill to achieve the purpose of writing.
A ballpoint pen is a pen that writes with ink and different pigments. The pen tip is a small steel ball embedded in a small cylindrical copper bowl, and then connected to a plastic pipe filled with ink. The ink flows down from all sides with the rotation of the steel ball.
The pigment of ballpoint pen ink is dye. There are three main colors of ink: blue, red and black, among which blue ink is the most used. In the past, the pigment components in blue ink were basic blue and basic purple, and the solvents were oxidized castor oil and ricinoleic acid. Basic dyes have been eliminated because of their poor light resistance (light resistance is only 1 -2), heat resistance, acid and alkali resistance and poor durability.