The writing principle of a ballpoint pen is mainly based on the friction produced by the contact between the ball and the paper during writing, which causes the ball to roll within the socket and bring out the ink or ink inside the pen core to achieve the purpose of writing.
The ballpoint pen for office supplies is a pen that is written using ink mixed with different pigments. The tip of the pen is a small steel ball embedded in a small cylindrical copper bowl, which is connected to a plastic tube containing ink. The ink flows out around the steel ball as it turns.
The pigment in ballpoint pen ink is a dye. The ink colors mainly include blue, red, and black, with blue ink being the most commonly used. In the past, the pigment component in blue ink was basic blue and basic phthalocyanine, and the solvent was oxidation castor oil and castor oil acid. Due to the fact that basic dyes are not light-resistant (with a light-fastness of only level 1-2), not heat-resistant, and not acid- and alkali-resistant, their durability is poor, so they have now been eliminated.
"424" blue ballpoint pens and "322" black ballpoint pens sold on the market have better durability in terms of the written text. Reports of toxic fragrant ballpoint pens are not uncommon. The volatile organic compounds contained in low-quality fragrant stationery are toxic and harmful to the human body. However, there has not yet been a case of poisoning caused by using oil-based ballpoint pens without added volatile organic compounds in normal use.
The main structure of a ballpoint pen is the upper and lower teeth column, with the upper teeth column being pressed by hand and the lower teeth column being able to rotate internally. The meshing of the upper and lower teeth columns is incomplete, with only the tips of the teeth biting a small part, and the guiding ridges behind the two biting teeth designed to slide in the same guiding groove. When the lower teeth column pushes out of the guiding groove of the upper teeth column, the teeth of the lower teeth column will slide along the inclined surface of the teeth of the upper teeth column due to the action of the spring, and the lower teeth column will rotate through an angle, sliding to the other side and being depressed, so as to achieve the function of ballpoint pens for office supplies.
This pen is more durable than a general fountain pen, but if it is not used and stored properly, it often cannot produce words. This is mainly because the dried ink oil sticks to the steel ball around the copper bowl, which obstructs the flow of ink. Ink is a viscous oil material, which is formulated by adding sesame oil, synthetic pine cone (mainly containing terpenol substances), mineral oil (obtained by fractionating petroleum, etc.), hard glue and oil fumes.
When using ballpoint pens for office supplies, do not write on paper with oil or wax, otherwise the oil and wax will be embedded in the copper bowl along the edge of the steel ball, affecting ink output and resulting in the inability to write. You should avoid hitting, exposing, and randomly placing the pen cap when not in use to prevent damage to the pen tip, deformation of the pen body, and leakage of pen ink to pollute objects. If the pen does not produce ink due to cold weather or long-term storage, the pen tip can be soaked in warm water for a moment and then moved on paper to produce words.
If a ballpoint pen falls to the ground and the pen tip hits the ground at a 90-degree angle, the ballpoint pen tip will not be damaged, but if the closure is damaged, "oil leakage" will occur at the gap and, when serious, the ball may fall off, resulting in difficulty in writing.